A Large-Deviation Analysis for the Maximum Likelihood Learning of Tree Structures (2009)
Animashree An, Lang Tong, Alan S. Willsky
Abstract—The problem of maximum-likelihood learning of the Markov tree structure of an unknown distribution from samples is considered when the distribution is Markov on a tree. Large-deviation...
Detection Error Exponent for Spatially Dependent Samples in Random Networks (2009)
Animashree An, Joseph E. Yukich, Lang Tong, Alan Willsky
Abstract—The problem of binary hypothesis testing is considered when the measurements are drawn from a Markov random field (MRF) under each hypothesis. Spatial dependence of the measurements is...
Prize-Collecting Data Fusion for Cost-Performance Tradeoff in Distributed Inference (2009)
Animashree An, Meng Wang, Lang Tong, Ananthram Swami
Abstract—A novel formulation for optimal sensor selection and in-network fusion for distributed inference known as the prizecollecting data fusion (PCDF) is proposed in terms of optimal tradeoff...
1 Energy Scaling Laws for Distributed Inference in Random Fusion Networks (2009)
Animashree An, Student Member, Joseph E. Yukich, Lang Tong, Ananthram Swami
Abstract—The energy scaling laws of multihop data fusion networks for distributed inference are considered. The fusion network consists of randomly located sensors distributed i.i.d. according to a...
Betting on Gilbert-Elliot Channels (2009)
In this paper a communication system operating over a Gilbert-Elliot channel is studied. The goal of the transmitter is to maximize the number of successfully transmitted bits. This is achieved by...
Energy Scaling Laws for Distributed Inference in Random Networks (2009)
Animashree An, Joseph E. Yukich, Lang Tong, Ananthram Swami
Abstract—The energy scaling laws of multihop data fusion networks for distributed inference are considered. The fusion network consists of randomly located sensors independently distributed...
Detection of Gauss–Markov Random Fields With Nearest-Neighbor Dependency (2009)
Animashree An, Student Member, Lang Tong, Ananthram Swami
Abstract—The problem of hypothesis testing against independence for a Gauss–Markov random field (GMRF) is analyzed. Assuming an acyclic dependency graph, an expression for the log-likelihood...
A Large-Deviation Analysis of the Maximum-Likelihood Learning of Markov Tree Structures (2009)
Tan, Vincent Y. F., Anandkumar, Animashree, Tong, Lang, Willsky, Alan S.
The problem of maximum-likelihood (ML) estimation of discrete tree-structured distributions is considered. Chow and Liu established that ML-estimation reduces to the construction of a maximum-weight...
Optimal Node Density for Detection in Energy Constrained Random Networks (2009)
Animashree Anandkumar, Lang Tong, Ananthram Swami
The problem of optimal node density maximizing the Neyman-Pearson detection error exponent subject to a constraint on average (per node) energy consumption is analyzed. The spatial correlation among...
the Team for Research in (2009)
Parv Venkitasubramaniam, Ting He, Lang Tong, Stephen B. Wicker
This work is supported in
A Likelihood-Based Multiple Access for Estimation in Sensor Networks (2009)
Stefano Marano, Vincenzo Matta, Lang Tong, Peter Willett
Abstract—In a wireless sensor network (WSN), the nodes collect independent observations about a nonrandom parameter to be estimated, and deliver informations to a fusion center (FC) by transmitting...
Integrated Mobile and Static Sensing for Target Tracking (2009)
Oliver Kosut, Andrey Turovsky, John Sun, Matthew Ezovski, Lang Tong
Abstract — Networks of low-power, low-cost, and widely distributed wireless sensor nodes are being envisioned and developed for many military applications including surveillance and localization....
Interference-Aware OFDMA Resource Allocation: A Predictive Approach (2009)
Abstract—As wireless systems continue to proliferate, interference management is becoming a concern in both military and commercial domains. This paper introduces a novel cognitive coexistence...
Non-Scalable Nature of Layered Architecture Routing: Shortest Path Raw Data: Yn (2009)
Anima Anandkumar, Lang Tong, Ananthram Swami, Anthony Ephremides, Yn [y, Avg Cost
Routing Cost along link (i, j) = dist(i, j) 2
Error Exponents for the Detection of Gauss–Markov Signals Using Randomly Spaced Sensors (2009)
Abstract—We derive the Neyman–Pearson error exponent for the detection of Gauss–Markov signals using randomly spaced sensors. We assume that the sensor spacings, I P FFF are drawn independently...
Adaptive Sensor Activity Control in Many-to-One Sensor Networks (2009)
Zhifeng Hu, Junshan Zhang, Senior Member, Lang Tong
Abstract—In this paper, we consider a many-to-one sensor network where a large number of sensors are deployed to monitor a physical environment. We explore sensor activity management to maximize...
Error exponents for bayesian detection with randomly spaced sensors (2009)
We study the detection of Gauss-Markov signals using randomly spaced sensors. We derive a lower bound on the Bayesian detection error based on the Kullback-Leibler divergence, and from this, define...
Cross Layer Design for Multiaccess Communication Over Rayleigh Fading Channels (2009)
Vidyut Naware, Student Member, Lang Tong
Abstract — An information theoretic queueing model is proposed in a wireless multiple access communication setup. The proposed symmetric N user model captures physical layer parameters such as the...
Abstract—The problem of retrieving information by a mobile access point from a sensor network where sensors cooperatively transmit messages using a common codebook is considered. It is assumed that...
Cognitive Medium Access: A Protocol for Enhancing Coexistence in WLAN Bands (2009)
Abstract — In this paper we propose Cognitive Medium Access (CMA), a protocol aimed at improving coexistence with a set of independently evolving WLAN bands. A time-slotted physical layer for the...
Cost-Performance Tradeoff in Multi-hop Aggregation for Statistical Inference (2009)
Animashree An, Lang Tong, Ananthram Swami, Anthony Ephremides
Abstract—The problem of distributed fusion for binary hypothesis testing in a multihop network is considered. The sensor measurements are spatially correlated according to a Markov random field...
Distributed Estimation via Random Access (2009)
Animashree An, Student Member, Lang Tong, Ananthram Swami Senior
Member, IEEE Abstract — The problem of distributed Bayesian estimation is considered in the context of a wireless sensor network. The Bayesian estimation performance is analyzed in terms of the...
Prize-Collecting Data Fusion for Cost-Performance Tradeoff (2009)
Animashree An, Meng Wang, Lang Tong, Ananthram Swami
A novel formulation for optimal sensor selection and in-network fusion for distributed inference known as the prize-collecting data fusion (PCDF) is proposed in terms of optimal tradeoff between the...
Antonio Ortega, Lang Tong, Haitao Zheng, Michele Zorzi, Antonio Ortega, Lang Tong, ...
articles distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Sergio Palazzo, Ros Tassiulas, Lang Tong, Sergio Palazzo, Ros Tassiulas, Lang Tong
open access articles distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly...
Cognitive Coexistence between Infrastructure and Ad-hoc Systems (2008)
Geirhofer, Stefan, Tong, Lang, Sadler, Brian M.
The rapid proliferation of wireless systems makes interference management more and more important. This paper presents a novel cognitive coexistence framework, which enables an infrastructure system...
Energy Scaling Laws for Distributed Inference in Random Fusion Networks (2008)
Anandkumar, Animashree, Yukich, Joseph E., Tong, Lang, Swami, Ananthram
The energy scaling laws of multihop data fusion networks for distributed inference are considered. The fusion network consists of randomly located sensors distributed i.i.d. according to a general...
The problem of placing known symbols in a data stream for a slowly varying frequency selective channel is considered from an information-theoretic perspective. Given the amount of redundancy...
Cross-Layer Design of Opportunistic Spectrum Access in the Presence of Sensing Error (2008)
Qing Zhao, Lang Tong, Ananthram Swami, Yunxia Chen
Abstract — We address the design of cognitive MAC protocols for opportunistic spectrum access in the presence of sensing error. Decentralized protocols are presented for ad hoc networks where there...
References Pilot Assisted Wireless Transmissions — References (2008)
Lang Tong, Brian M. Sadler, Min Dong, A. Lapidoth, S. Shamai
[3] S. Adireddy and L. Tong, “Optimal placement of known symbols for slowly varying frequency selective channels, ” accepted to IEEE Trans. Wireless Communications, 2003.
OPTIMAL TRAINING OVER THE GAUSS-MARKOV FADING CHANNEL: A CUTOFF RATE ANALYSIS (2008)
Saswat Misra, Ananthram Swami, Lang Tong
We consider the problem of optimal allocation of resources between training and data for transmission over a Gauss-Markov fading channel. Inaccurate channel state information (CSI) is available at...
in an uncharted path Signal Processing in Random Access (2008)
Lang Tong, Vidyut Naware, Parvathinathan Venkitasubramaniam
The design of medium access control (MAC) protocols has traditionally been separated from that of the physical (PHY) layer. To a MAC protocol designer, the PHY layer is a black box satisfying the...
Abstract—The communication capacity of Cooperative SEnsor (2008)
Zhiyu Yang, Student Member, Lang Tong
some sensors may be misinformed with erroneous messages. It is assumed that a global message is first distributed to all the nodes, each node receiving the message correctly with probability I. The...
NETWORKING WITH SECRECY CONSTRAINTS (2008)
Parvathinathan Venkitasubramaniam, Ting He, Lang Tong
Wireless Networks are susceptible to anonymous monitoring of transmissions by adversaries who can infer valuable information about data flows in the network. It is therefore necessary to design...
Decentralized Cognitive MAC for Opportunistic Spectrum Access in Ad Hoc Networks: (2008)
A Pomdp Framework, Qing Zhao, Lang Tong, Ananthram Swami, Yunxia Chen
Abstract — We propose decentralized cognitive MAC protocols that allow secondary users to independently search for spectrum opportunities without a central coordinator or a dedicated communication...
Stefan Geirhofer, Lang Tong, Brian M. Sadler
In this work we are concerned with dynamically sharing the spectrum in the time-domain by exploiting whitespace between the bursty transmissions of a primary user, represented by an 802.11b-based...
COMPUTATIONAL STRUCTURES FOR BLIND LONG-CODE WCDMA RECEIVERS (2008)
Long-code wideband CDMA receivers are for computational reasons usually based on simple matched-filter techniques, and hence suffer from multiaccess interference. To mitigate this problem, we propose...
Abstract: UMTS systems will employ long-code wideband CDMA modulation schemes. Receivers for this system are for computational reasons usually based on simple matched-filter techniques, and hence...
Qing Zhao, Lang Tong, David Counsil
Abstract—We propose and analyze an energy-aware traffic-adaptive routing strategy for large-scale mobile ad hoc networks (MANETs). Referred to as Energy-Aware GEolocation-aided Routing (EAGER),...
Toward an Analytical Approach to Anonymous Wireless Networking (2008)
Parvathinathan Venkitasubramaniam, Ting He, Lang Tong, Stephen B. Wicker
Transmissions in a wireless network are susceptible to unauthorized traffic analysis by eavesdroppers. Although cryptography can protect the contents of communication, the transmission times of...
DUMB ISOTROPIC SENSORS CAN FIND DOAS (2008)
Vincenzo Matta, Stefano Marano, Peter Willett, Lang Tong
Following the SENMA concept, we consider a wireless network of very dumb and cheap sensors, polled by a travelling “rover”. Sensors are randomly placed and isotropic: individually they have no...
MULTI-MODAL SENSOR LOCALIZATION USING A MOBILE ACCESS POINT (2008)
Brian M. Sadler, Richard J. Kozick, Lang Tong
We consider the problem of sensor node localization in a randomly deployed sensor network, using a mobile access point (AP). The mobile AP can be used to localize many sensors simultaneously in a...
Cross-Layer Design of Sequential Detectors in Sensor Networks (2008)
Stefano Marano, Vincenzo Matta, Peter Willett, Lang Tong
Abstract—A network of sensors polled by a mobile agent (the SENMA paradigm) is used for detection purposes, with both the remote nodes and the mobile agent implementing Wald’s sequential tests....
DETECTION OF GAUSS-MARKOV RANDOM FIELD ON NEAREST-NEIGHBOR GRAPH (2008)
The problem of hypothesis testing against independence for a Gauss-Markov random field (GMRF) with nearest-neighbor dependency graph is analyzed. The sensors measuring samples from the signal field...
Cutoff Rate Optimal Binary Inputs with Imperfect CSI (2008)
Saswat Misra, Ananthram Swami, Senior Member, Lang Tong, Senior Member
Abstract — We use the cutoff rate to study the optimal binary input distributions for the Rayleigh flat-fading channel with imperfect receiver channel state information (CSI). First, we evaluate...
OPTIMAL RECONSTRUCTION OF GAUSS MARKOV FIELD IN LARGE SENSOR NETWORKS (2008)
We consider the problem of reconstructing a one-dimensional Gauss Markov field measured by a large-scale sensor network. Two data retrieval strategies are considered: the scheduling that collects...
A. Information Retrieval in Sensor Networks (2008)
Abstract — We consider information retrieval in a wireless sensor network deployed for the reconstruction of a spatially correlated signal field. Referred to as QUality-of-service specific...
Quantization for Maximin ARE in Distributed Estimation (2008)
Parvathinathan Venkitasubramaniam, Student Member, Lang Tong, Ananthram Swami, Senior Member
Abstract—We consider the design of optimal quantizers for the distributed estimation of a deterministic parameter. In particular, we design deterministic scalar quantizers to maximize the minimum...
Min Dong, Lang Tong, Brian M. Sadler
We investigate the effect of medium access control (MAC) used in information retrieval by a mobile access point (AP) on information processing in large-scale sensor network, where sensors are...
Multiplexing Two Information Sources over Fading Channels: A Cross-layer Design Perspective (2008)
We consider the transmission over an unknown frequency-selective channel of two indepen-dent sources with different application-layer characteristics: one source (such as voice) has a low information...
Type-Based Random Access for Distributed Detection Over Multiaccess Fading Channels (2008)
Animashree An, Student Member, Lang Tong
Abstract—The problem of distributed detection in a sensor network over multiaccess fading channels is considered. A random-access transmission scheme referred to as the type-based random access...
Moment Estimation and Dithered Quantization (2008)
Stefan Geirhofer, Student Member, Lang Tong, Brian M. Sadler, Senior Member
Abstract—This letter examines the influence of low-bit quantization on moment estimators with special emphasis on the 1-bit case. Moment estimators are especially useful if no prior knowledge on...
Gökhan Mergen, Qing Zhao, Lang Tong
Sensor network with mobile access (SENMA) is an architecture in which randomly deployed low-power sensors are orchestrated by a few powerful mobile access points. This paper considers SENMA from...
Opportunistic Spectrum Access via Periodic Channel Sensing (2008)
Qianchuan Zhao, Stefan Geirhofer, Student Member, Lang Tong, Brian M. Sadler
Abstract — The problem of opportunistic access of parallel channels occupied by primary users is considered. Under a continuous-time Markov chain modeling of the channel occupancy by the primary...
Minimum Cost Data Aggregation with Localized Processing for Statistical Inference (2008)
Animashree An, Lang Tong, Ananthram Swami
The problem of minimum cost in-network fusion of measurements, collected from distributed sensors via multihop routing is considered. A designated fusion center performs an optimal...
Minimum Cost Data Aggregation with Localized Processing for Statistical Inference (2008)
Animashree An, Lang Tong, Ananthram Swami, Anthony Ephremides
Abstract—The problem of minimum cost in-network fusion of measurements, collected from distributed sensors via multihop routing is considered. A designated fusion center performs an optimal...
Distributed source coding in the presence of Byzantine sensors (2008)
Oliver Kosut, Student Member, Lang Tong
Abstract — The distributed source coding problem is considered when the sensors, or encoders, are under Byzantine attack; that is, an unknown group of sensors have been reprogrammed by a malicious...
Distributed Estimation Via Random Access (2008)
Animashree Anandkumar, Lang Tong, Ananthram Swami
In this correspondence, the problem of distributed Bayesian estimation is considered in the context of a wireless sensor network. The Bayesian estimation performance is analyzed in terms of the...
Distributed source coding in the presence of Byzantine sensors (2008)
Oliver Kosut, Student Member, Lang Tong
Abstract—The distributed source coding problem is considered when the sensors, or encoders, are under Byzantine attack; that is, an unknown group of sensors have been reprogrammed by a malicious...
Minimum Cost Data Aggregation with Localized Processing for Statistical Inference (2008)
Animashree Anandkumar, Lang Tong, Ananthram Swami, Anthony Ephremides
The problem of minimum cost in-network fusion of measurements, collected from distributed sensors via multihop routing is considered. A designated fusion center performs an optimal...
Energy Scaling Laws for Distributed Inference in Random Networks (2008)
Animashree Anandkumar, Joseph E. Yukich, Lang Tong, Ananthram Swami
The energy scaling laws of multihop data fusion networks for distributed inference are considered. The fusion network consists of randomly located sensors independently distributed according to a...
Opportunistic Spectrum Access via Periodic Channel Sensing (2008)
Qianchuan Zhao, Stefan Geirhofer, Student Member, Lang Tong, Brian M. Sadler
Abstract—The problem of opportunistic access of parallel channels occupied by primary users is considered. Under a continuoustime Markov chain modeling of the channel occupancy by the primary...
Optimal Node Density for Detection in Energy-Constrained Random Networks (2008)
Animashree Anandkumar, Lang Tong, Ananthram Swami
The problem of optimal node density maximizing the Neyman-Pearson detection error exponent subject to a constraint on average (per node) energy consumption is analyzed. The spatial correlation among...
A Cognitive Framework for Improving Coexistence Among Heterogeneous Wireless Networks (2008)
Abstract—The proliferation of wireless systems requires that the coexistence between heterogeneous technologies be addressed. This paper presents a cognitive framework in which sensingbased...
Detection of Gauss-Markov Random Fields with Nearest-Neighbor Dependency (2008)
Animashree Anandkumar, Lang Tong, Ananthram Swami
The problem of hypothesis testing against independence for a Gauss-Markov random field (GMRF) is analyzed. Assuming an acyclic dependency graph, an expression for the log-likelihood ratio of...
Anonymous Networking amidst Eavesdroppers (2008)
Parvathinathan Venkitasubramaniam, Ting He, Lang Tong
Abstract—The problem of security against packet timing based traffic analysis in wireless networks is considered in this work. An analytical measure of “anonymity ” of routes in eavesdropped...
A. Packet Collision and Multiple Packet Reception in Random Access Networks (2007)
Qing Zhao, Student Member, Lang Tong
Abstract—A new signal processing based collision resolution technique for random access wireless ad hoc networks is proposed in this paper. Without assuming the knowledge of propagation channels...
Blind Channel Estimation for Space-Time Coded WCDMA (2007)
Youngchul Sung, Lang Tong, Ananthram Swami
A new blind channel estimation technique is proposed for space-time coded wideband CDMA systems using aperiodic and possibly multirate spreading codes. Using a decorrelating front-end, the received...
Atul Maharshi, Lang Tong, Anathram Swami
Abstract-- We consider a reservation-based medium access control (MAC) scheme where users reserve data channels through a slotted-ALOHA procedure. The base station grants access to users in a...
Abstract--The problem of channel estimation for a frequency hopping system is considered in this paper. Under a discrete multipath fading model, the path gains and delays are estimated separately. By...
Outage Probability Comparison of CP-OFDM and TDS-OFDM for Broadcast Channels (2007)
Zhiyu Yang, Lang Tong, Lin Yang
Abstract — The time domain synchronous orthogonal frequency PSfragdivi replacements sion multiplex (TDS-OFDM) modulation scheme has recently been proposed in a new digital television (DTV) system....
Signal Parameter Estimation via the Cayley-Hamilton Constraint (2007)
Prashanth H, Lang Tong, Lang Tong
The ESPRIT algorithm has proved to be a robust solution to exploit single in-variance structure in array elements. However, ESPRIT is not flexible to incorporate multiple invariances. A closed form...
Efficient Matrix Computations in Wideband Communications (2007)
Modern telecommunications put increasing demands on the efficient use of bandwidth in a channel. This is especially true in the upcoming wideband channels, where a large number of users are spread...
Existence and Performance of Shalvi–Weinstein (2007)
Abstract—The Shalvi–Weinstein (SW) criterion has become popular in the design of blind linear estimators of i.i.d. processes transmitted through unknown linear channels in the presence of unknown...
ltongee.cornell.edu Abstract-- The problem of placing known symbols optimally is considered. We first approach the problem from information theoretic perspective. We obtain placement schemes that...
DESIGN METHODOLOGIES FOR ADAPTIVE AND MULTIMEDIA NETWORKS (2007)
Lang Tong, Qing Zhao, Gokhan Mergen
Recently, there has been considerable interest in the idea of cross-layer design of wireless networks. This is motivated by the need to provide a greater level of adaptivity to variations of wireless...
Efficient Matrix Computations in Wideband Communications (2007)
Modern telecommunications put increasing demands on the efficient use of bandwidth in a channel. This is especially true in the upcoming wideband channels, where a large number of users are spread...
SIGNAL PROCESSING Identification of multichannel MA parameters using (2007)
Higher-order Statistics, Lang Tong
The identification of multichannel moving average (MA) parameter matrices {H(k)} using fourth-order output cumulants is considered. By analyzing the eigenstructures of the cumulant matrices, it is...
Abstract-- A reservation-based medium access con-trol (MAC) scheme is considered where users reserve data channels through a slotted-ALOHA procedure. The base station grants access to users in a...
Semiconductor Product Sector (2007)
A performance comparison is presented between two types of CDMA random access systems: cellular and ad hoc. Based on a finite population model, the network throughput is derived for both systems. Two...
Multipath Delay Estimation for Frequency Hopping Systems (2007)
Prashanth H, Ananthram Swami, Lang Tong, Lang Tong
The multipath delay estimation problem for a slow frequency hopping system is studied. High resolution delay estimation algorithms are proposed by exploiting in-variance structures in the data...
The Dynamic Queue Protocol for Spread Spectrum Random Access Networks (2007)
The dynamic queue MAC protocol [12] is designed explicitly for networks with multipacket reception (MPR). It pro-vides efficient channel utilization with a simple on-line implementation. In this...
Estimation of the Number of Operating Sensors in a Sensor Network (2007)
This paper investigates the estimation of the number of operating sensors in a wireless sensor network. The basic model considered is equivalent to an urn model with replacement. For this model, we...
St Asilomar Conference, Philip Schniter, Tomas J. Enders, James D. Behm, Donald R, Raúl A. Casas, ...
References
Training Symbol Placement for Packet Transmissions under Asynchronous Interference (2007)
In a multiple access communication system that uses packet transmissions, the packets of one user might be subject to asynchronous interference from the packets of other users in the system. This...
Distributed Opportunistic Transmission for Wireless Sensor Networks (2007)
We consider protocol design for extracting information at sensors by a mobile access point. Energy efficiency, defined as the expected number of bits reliably received for each unit of energy...
PACKET DESIGN FOR COMMUNICATION UNDER ASYNCHRONOUS INTERFERENCE ABSTRACT (2007)
The asynchronous interference arises in many wireless multiple access communication systems. This paper considers the problem of placing the training symbols within the data packets when these...
Large Deviations for Slotted ALOHA Random Access (2007)
The effective bandwidth of a source measures the amount of burstiness besides the data generation rate. The effective bandwidths provide a means to guarantee qualityof-service in terms of packet loss...
We consider the transmission over an unknown frequency-selective channel of two independent sources with different characteristics: one source (such as voice) has a low information rate with a strict...
Signal Processing in Random Access: A Cross Layer Perspective (2007)
Layer Perspective, Lang Tong, V. Naware, P. Venkitasubramaniam
this paper, we consider the interactions between the physical (PHY) and the medium access control (MAC) layers where there are reasonable models that interface the two. Specifically, we focus on...
Anonymous Networking amidst Eavesdroppers (2007)
Venkitasubramaniam, Parvathinathan, He, Ting, Tong, Lang
The problem of security against timing based traffic analysis in wireless networks is considered in this work. An analytical measure of anonymity in eavesdropped networks is proposed using the...
Distributed Source Coding in the Presence of Byzantine Sensors (2007)
The distributed source coding problem is considered when the sensors, or encoders, are under Byzantine attack; that is, an unknown group of sensors have been reprogrammed by a malicious intruder to...
Detection of Gauss-Markov Random Fields with Nearest-Neighbor Dependency (2007)
Anandkumar, Animashree, Tong, Lang, Swami, Ananthram
The problem of hypothesis testing against independence for a Gauss-Markov random field (GMRF) is analyzed. Assuming an acyclic dependency graph, an expression for the log-likelihood ratio of...
Variable-Rate Distributed Source Coding in the Presence of Byzantine Sensors (2007)
The distributed source coding problem is considered when the sensors, or encoders, are under Byzantine attack; that is, an unknown number of sensors have been reprogrammed by a malicious intruder to...
Cooperative Routing for Distributed Detection in Large Sensor Networks (2007)
Sung, Youngchul, Misra, Saswat, Tong, Lang, Ephremides, Anthony
In this paper, the detection of a correlated Gaussian field using a large multi-hop sensor network is investigated. A cooperative routing strategy is proposed by introducing a new link metric that...
Cooperative routing for distributed detection in large sensor networks (2007)
Youngchul Sung, Saswat Misra, Lang Tong, Anthony Ephremides
Abstract — In this paper, the detection of a correlated Gaussian field using a large multi-hop sensor network is investigated. A cooperative routing strategy is proposed by introducing a new link...
Stefan Geirhofer, Student Member, Lang Tong, Brian M. Sadler
Abstract — In this paper we design a cognitive radio that can coexist with multiple parallel WLAN channels while abiding by an interference constraint. The interaction between both systems is...
Dynamic spectrum access is a promising approach to alleviate the spectrum scarcity that wireless communications face today. In short, it aims at reusing sparsely occupied frequency bands while...
Detecting Encrypted Stepping-Stone Connections (2007)
Ting He, Student Member, Lang Tong
Abstract—Stepping-stone attacks are often used by network intruders to hide their identities. In a stepping-stone attack, attacking commands are sent indirectly to the victim through a chain of...
In this work, we present several algorithms for scheduling the transmission of information flows while inserting the minimum number of chaff packets. In addition, we also propose detection algorithms...
In this work, we present pseudo code implementations of several algorithms for detecting information flows based on quantized timing measurements. We refer to [1] for the problem formulation and the...
Optimal Dynamic Spectrum Access via Periodic Channel Sensing (2007)
Qianchuan Zhao, Stefan Geirhofer, Lang Tong, Brian M. Sadler
Abstract — The problem of dynamically accessing a set of parallel channels occupied by primary users is considered. The secondary user is allowed to sense and to transmit in a single channel. By...
Score-function quantization for distributed estimation,” presented at the CISS (2007)
Parvathinathan Venkitasubramaniam, Lang Tong
Abstract — We study the problem of quantization for distributed parameter estimation. We propose the design of scorefunction quantizers to optimize different metrics of estimation performance....
Distributed Detection of Information Flows (2007)
Distributed detection of information flows is considered in which traffic sensors at different locations of a network observe transmission epochs. The traffic sensors communicate their measurements...
Signal processin for Application-Specific AD Hoc Networks (2006)
Sung, Youngchul, Misra, Saswat, Tong, Lang, Ephremides, Anthony
U.S. Army Research Lab. (ARL), National Science Foundation (NSF)
Capacity of Cooperative Fusion in the Presence of Byzantine Sensors (2006)
The problem of cooperative fusion in the presence of Byzantine sensors is considered. An information theoretic formulation is used to characterize the Shannon capacity of sensor fusion. It is shown...
Sung, Youngchul, Tong, Lang, Poor, H. Vincent
The performance of Neyman–Pearson detection of correlated random signals using noisy observations is considered. Using the large deviations principle, the performance is analyzed via the error...
Optimal training for time-selective wireless fading channels using cutoff rate (2006)
Saswat Misra, Ananthram Swami, Lang Tong
We consider the optimal allocation of resources—power and bandwidth—between training and data transmissions for singleuser time-selective Rayleigh flat-fading channels under the cutoff rate...
Youngchul Sung, Lang Tong, H. Vincent Poor
Abstract—The performance of Neyman–Pearson detection of correlated random signals using noisy observations is considered. Using the large deviations principle, the performance is analyzed via the...
Nonparametric change detection and estimation in large scale sensor networks (2006)
Ting He, Shai Ben-david, Lang Tong
Abstract — We propose algorithms for nonparametric samplebased spacial change detection and estimation in large scale sensor networks. We collect random samples containing the location of sensors...
Channel aware distributed detection in wireless sensor networks (2006)
Biao Chen, Lang Tong, Pramod K. Varshney
[The integration of wireless channel conditions in algorithm design] In a distributed detection (DD) system, multiple sensors/detectors work collaboratively to distinguish between two or more...
A measurement-based model for dynamic spectrum access (2006)
Abstract — In this paper we consider dynamically sharing the spectrum in the time-domain by exploiting whitespace between the bursty transmissions of a set of users, represented by an 802.11b based...
Abstract — The performance of Neyman-Pearson detection of correlated stochastic signals using noisy observations is investigated via the error exponent for the miss probability with a fixed level....
Min Dong, Lang Tong, Brian M. Sadler, Senior Member
Abstract—We analyze the impact of data retrieval pattern on the reconstruction performance of a one-dimensional homogeneous random field measured by a large-scale sensor network. From a networking...
Packet scheduling against stepping-stone attacks with chaff (2006)
Ting He, Parvathinathan Venkitasubramaniam, Lang Tong
We consider scheduling packet transmissions in a network so that the efficiency of stepping-stone attacks can be severely restrained with the help of stepping-stone monitors. We allow the attacker to...
Support-based and ML approaches to DOA estimation in a dumb sensor network (2006)
Stefano Marano, Vincenzo Matta, Peter Willett, Lang Tong
Abstract—A recent paper by Marano et al. shows that a network of unconnected and completely direction-of-arrival (DOA)-blind sensors (“beepers”) is able to perform DOA estimation quite...
Minimax Quantization for Distributed Maximum Likelihood Estimation,” submitted to (2006)
Parvathinathan Venkitasubramaniam, Lang Tong, Ananthram Swami
We consider the design of quantizers for the distributed estimation of a deterministic parameter, when the fusion center uses a Maximum-Likelihood estimator. We define a new metric of performance,...
Nonparametric change detection and estimation in large scale sensor networks (2006)
Ting He, Student Member, Shai Ben-david, Lang Tong
Abstract—The problem of detecting changes in the distribution of alarmed sensors is considered. Under a nonparametric change detection framework, several detection and estimation algorithms are...
Relay Secrecy in Wireless Networks with Eavesdroppers (2006)
Parvathinathan Venkitasubramaniam, Ting He, Lang Tong
Abstract — Anonymous monitoring of transmissions in a wireless network by eavesdroppers can provide critical information about the data flows in the network. It is, therefore, necessary to design...
Optimal Training for Time-Selective Wireless Fading Channels Using Cutoff Rate (2006)
Saswat Misra, Ananthram Swami, Lang Tong
We consider the optimal allocation of resources—power and bandwidth—between training and data transmissions for single-user time-selective Rayleigh flat-fading channels under the cutoff rate...
Sung, Youngchul, Tong, Lang, Ephremides, Anthony
MILCOM 2005. 2006 IEEE Military Communications Conference (17-20 Oct. 2005 : Atlantic City, NJ, USA)
Sung, Youngchul, Tong, Lang, Poor, H. Vincent
The performance of Neyman-Pearson detection of correlated stochastic signals using noisy observations is investigated via the error exponent for the miss probability with a fixed level. Using the...
Optimal and Suboptimal Detection of Gaussian Signals in Noise: Asymptotic Relative Efficiency (2005)
Sung, Youngchul, Tong, Lang, Poor, H. Vincent
The performance of Bayesian detection of Gaussian signals using noisy observations is investigated via the error exponent for the average error probability. Under unknown signal correlation structure...
Sung, Youngchul, Tong, Lang, Poor, H. Vincent
The performance of Neyman-Pearson detection of correlated stochastic signals using noisy observations is investigated via the error exponent for the miss probability with a fixed level. Using the...
Asymptotic Locally Optimal Detector for Large Scale Sensor Networks Under the Poisson Regime (2005)
Sung, Youngchul, Tong, Lang, Swami, Ananthram
We consider distributed detection with a large number of identical binary sensors deployed over a region where the phenomenon of interest (POI) has spatially varying signal strength. Each sensor...
A LARGE DEVIATIONS APPROACH TO SENSOR SCHEDULING FOR DETECTION OF CORRELATED RANDOM FIELDS (2005)
Sung, Youngchul, Tong, Lang, Poor, H. Vincent
The problem of scheduling sensor transmissions for the detection of correlated random fields using spatially deployed sensors is considered. Using the large deviations principle, a closed-form...
Sensor Configuration and Activation for Field Detection in Large Sensor Arrays (2005)
Sung, Youngchul, Tong, Lang, Poor, H. Vincent
The problems of sensor configuration and activation for the detection of correlated random fields using large sensor arrays are considered. Using results that characterize the large-array performance...
A Large Deviations Approach to Sensor Scheduling for Detection of Correlated Random Fields (2005)
Sung, Youngchul, Tong, Lang, Poor, H. Vincent
The problem of scheduling sensor transmissions for the detection of correlated random fields using spatially deployed sensors is considered. Using the large deviations principle, a closed-form...
Cross-Layer Design for Medium Access Control in CDMA Ad Hoc Networks (2005)
A medium access control (MAC) protocol for spread-spectrum ad hoc networks with dynamic channel allocation (DCA) is presented. DCA can support large systems with a smaller number of channels by...
Sensor configuration and activation for field detection in large sensor arrays (2005)
Youngchul Sung, Xin Zhang, Lang Tong, H. Vincent Poor
The problems of sensor configuration for the detection of correlated random fields using large sensor arrays are considered. Using error exponents that characterize the asymptotic behavior of the...
Exploiting decentralized channel state information for random access (2005)
We study the use of channel state information for random access in fading channels. Traditionally, random access protocols have been designed by assuming simple models for the physical layer where...
We pursue an analytical approach to energy consumption characterization of large scale mobile ad hoc networks. An energy aware hybrid routing strategy is proposed and analyzed. Referred to as Energy...
Exploiting decentralized channel state information for random access (2005)
Srihari Adireddy, Student Member, Lang Tong
Abstract—We study the use of channel state information (CSI) for random access in fading channels. Traditionally, random access protocols have been designed by assuming simple models for the...
Estimating sensor population via probabilistic sequential polling (2005)
Abstract—A probabilistic sequential polling protocol (PSPP) is presented for the estimation of the sensor population in a large-scale sensor network with a mobile access point. It is shown that...
Asymptotic detection performance of type-based multiple access in sensor networks (2005)
Gökhan Mergen, Vidyut Naware, Student Member, Student Member, Lang Tong
Abstract—The problem of communicating sensor readings over a multiaccess channel for detecting a target using type-based multiple access (TBMA) is considered. TBMA is analyzed in a general...
Synchronization and packet separation in wireless ad hoc networks by known modulus algorithms (2005)
Relja Djapic, Lang Tong, Senior Member, Senior Member
Abstract—In mobile asynchronous ad hoc networks, multiple users may transmit packets at the same time. If a collision occurs, then in current systems both packets are lost and need to be...
Quantization for distributed estimation in large scale sensor networks (2005)
Parvathinathan Venkitasubramaniam, Gökhan Mergen, Lang Tong, Ananthram Swami
We study the problem of quantization for distributed parameter estimation in large scale sensor networks. Assuming a Maximum Likelihood estimator at the fusion center, we show that the Fisher...
Sensor configuration and activation for field detection in large sensor arrays (2005)
Youngchul Sung, Xin Zhang, Lang Tong, H. Vincent Poor
The problems of sensor configuration and activation for the detection of correlated random fields using large sensor arrays are considered. Using results that characterize the asymptotic behavior of...
Cristian Budianu, Shai Ben-david, Lang Tong
Abstract—This paper investigates the estimation of the number of operating sensors in a sensor network in which the data collection is made by a mobile access point. In this paper, an estimator...
DOA estimation via a network of dumb sensors under the SENMA paradigm (2005)
Stefano Marano, Vincenzo Matta, Peter Willett, Lang Tong
Abstract—Following the SENMA concept, we consider a wireless network of very dumb and cheap sensors, polled by a travelling “rover. ” Sensors are randomly placed and isotropic: Individually,...
Let (X, F) be a given measurable space, and A ⊆ F be a set of (possibly infinitely many) measurable sets. Assume X ⊆ R 2,i.e., the sample space is a planar region. In accordance with [1], define...
Stability and capacity of regular wireless networks (2005)
Gökhan Mergen, Student Member, Lang Tong
Abstract—We study the stability and capacity problems in regular wireless networks. In the first part of the paper, we provide a general approach to characterizing the capacity region of arbitrary...
We formulate the problem of change location estimation in 2D random fields as a nonpara-metric set estimation problem. We define nonparametric estimators to solve this problem, and prove that our...
Asymptotic detection performance of type-based multiple access in sensor networks (2005)
Gökhan Mergen, Vidyut Naware, Lang Tong
The problem of communicating sensor readings over a multiaccess channel for detecting a target using Type-Based Multiple Access (TBMA) is considered. TBMA is analyzed in a general framework by...
We consider distributed information retrieval for sensor networks with cluster heads or mobile access points. The performance metric used in the design is energy efficiency defined as the ratio of...
and L.Tong, “Stability and Delay of Finite-User Slotted ALOHA With Multipacket Reception (2005)
Vidyut Naware, Gökhan Mergen, Student Member, Student Member, Lang Tong
Abstract—The effect of multipacket reception (MPR) on stability and delay of slotted ALOHA based random-access systems is considered. A general asymmetric MPR model is introduced and the...
Cooperative sensor networks with misinformed nodes (2005)
Abstract — We consider the communication from a cooperative sensor network to a mobile access point. We assume that sensors are informed with a global message and some nodes are misinformed with...
Sensor configuration and activation for field detection in large sensor arrays (2005)
Abstract — The problems of sensor configuration and activation for the detection of correlated random fields using large sensor arrays are considered. Using results that characterize the...
Synchronization and packet separation in wireless ad hoc networks by known modulus algorithms (2005)
(topic: signal processing issues in ad hoc networks) Abstract—In mobile asynchronous ad hoc networks (MANETs), multiple users may transmit packets at the same time. If a collision occurs, then in...
Sensor configuration and activation for field detection in large sensor arrays (2005)
Youngchul Sung, Xin Zhang, Lang Tong, H. Vincent Poor
Abstract—The problem of sensor configuration for the detection of correlated random fields using large sensor arrays is considered. Using error exponents that characterize the asymptotic behavior...
Cross-Layer Design for Medium Access Control in CDMA Ad Hoc Networks (2005)
A medium access control (MAC) protocol for spread-spectrum ad hoc networks with dynamic channel allocation (DCA) is presented. DCA can support large systems with a smaller number of channels by...
Opportunistic Carrier Sensing for Energy-Efficient Information Retrieval in Sensor Networks (2005)
We consider distributed information retrieval for sensor networks with cluster heads or mobile access points. The performance metric used in the design is energy efficiency defined as the ratio of...
MAC Protocols for Optimal Information Retrieval Pattern in Sensor Networks with Mobile Access (2005)
Zhiyu Yang, Min Dong, Lang Tong, Brian M. Sadler
In signal field reconstruction applications of sensor network, the locations where the measurements are retrieved from affect the reconstruction performance. In this paper, we consider the design of...
Blind Channel Estimation for Space-Time Coded WCDMA (2004)
Sung, Youngchul, Tong, Lang, Swami, Ananthram
A new blind channel estimation technique is proposed for space-time coded wideband CDMA systems using aperiodic and possiblymultirate spreading codes. Using a decorrelating front end, the received...
Asymptotic locally optimal detector for large scale sensor networks under the Poisson regime (2004)
Sung, Youngchul, Tong, Lang, Swami, Ananthram
Proceedings of 2004 International Conference Communications, Paris, France
ASYMPTOTIC LOCALLY OPTIMAL DETECTOR FOR LARGE-SCALE SENSOR (2004)
Sung, Youngchul, Tong, Lang, Swami, Ananthram
Proceeding of 2004 International Conference on Acoustics, Speech, and Signal Processing, Montreal, Canada
Tracking of Fast-Fading Channels in Long Code CDMA (2004)
A new technique for blind tracking of fast-fading channels in long-code code division multiple access (CDMA) is proposed by exploiting multipath diversity. Based on a linear interpolation channel...
An Analysis of Optimal Training for Correlated Fading Channels Using Cutoff Rate (2004)
Misra, Saswat, Swami, Ananthram, Tong, Lang
We consider the problem of optimal allocation of resources (power and bandwidth) between training and data for transmission over a Gauss Markov fading channel. Inaccurate channel state information...
Optimal insertion of pilot symbols for transmissions over time-varying flat fading channels (2004)
Min Dong, Lang Tong, Brian M. Sadler
Two major training techniques for wireless channels are time division multiplexed (TDM) training, and superimposed training. For the TDM schemes with regular periodic placements (RPP), the...
Non-Parametric Approach to Change Detection and Estimation in Large Scale Sensor Networks (2004)
Shai Ben-david, Ting He, Lang Tong
Abstract — We consider a non-parametric, spatial sample-based scheme for the detection and estimation of changes of a random field by collecting packets from randomly distributed sensors. We assume...
Asymptotic locally optimal detector for large-scale sensor networks under the Poisson regime (2004)
Youngchul Sung, Lang Tong, Ananthram Swami
We consider distributed detection with a large number of identical binary sensors deployed over a region where the phenomenon of interest (POI) has spatially varying signal strength. Each sensor...
Pilot-assisted wireless transmissions (2004)
Lang Tong, Brian M. Sadler, Min Dong
The design of pilot assisted wireless transmissions is considered from signal processing and information theoretical perspectives. A general pilot placement model is presented and related figures of...
Sensor Network with Multiple Mobile Access Points (2004)
Parvathinathan Venkitasubramaniam, Qing Zhao, Lang Tong
We consider sensor networks with mobile access points where data at sensor nodes are collected by multiple mobile access points. Using throughput and energy efficiency as performance measures, we...
On the Asymptotic Stable Throughput of Opportunistic Random Access (2004)
Asymptotic stable throughput (AST) is the maximum arrival rate a large network can support while keeping queues bounded. We characterize the maximum AST of random access with distributed channel...
Sensor Networks with Mobile Access: Optimal Random Access and Coding (2004)
Parvathinathan Venkitasubramaniam, Srihari Adireddy, Lang Tong
We consider random access and coding schemes for sensor networks with mobile access (SENMA). Using an orthogonal code division multiple access (CDMA) as the physical layer, an opportunistic ALOHA...
Estimation over Multiaccess Channels (2004)
We study the problem of communicating sensor readings over a Gaussian multiaccess channel. We focus on the scenario that each sensor observes a single random variable, and transmits it using certain...
Cross layer design for Medium Access Control in CDMA Ad-hoc Networks (2004)
A medium-access control (MAC) protocol for spreadspectrum ad-hoc networks with Dynamic Channel Allocation (DCA) is presented. DCA can support large systems with a smaller number of channels by...
Cooperative Sensor Networks with Misinformed Sensors (2004)
We consider the communication from a cooperative sensor network to a mobile access point. We assume that sensors are informed with a global message and some nodes are misinformed with random...
On the Asymptotic Stable Throughput of Opportunistic Random Access (2004)
Asymptotic stable throughput (AST) is the maximum arrival rate a large network can support while keeping queues bounded. We establish the maximum AST of random access with distributed channel state...
Estimation Over deterministic multiaccess channels (2004)
We study the problem of communicating sensor readings over a Gaussian multiaccess (MAC) channel. We focus on the scenario that each sensor observes a single random variable, and transmits it using...
Effect of MAC design on source estimation in dense sensor networks (2004)
We investigate the impact of medium access control (MAC) design on the reconstruction performance of a one-dimensional random signal field measured by a large scale sensor network. Assuming the...
connectionless approach to large scale sensor networks”,Proc (2004)
We consider a connectionless approach to large scale sensor network. Given a fixed traffic load and fading characteristics, analytical expressions for energy consumption are derived for two types of...
Asymptotic locally optimal detector for large-scale sensor networks under the Poisson regime (2004)
Youngchul Sung, Lang Tong, Ananthram Swami, Senior Member
Abstract—We consider distributed detection with a large number of identical binary sensors deployed over a region where the phenomenon of interest (POI) has spatially varying signal strength. Each...
We give a method to measure the distance between two probability distributions, and based on the distance measure, we bound the probability that the distance between the empirical distribution and...
Zhiyu Yang, Min Dong, Lang Tong, Brian M. Sadler
In signal field reconstruction applications of sensor network, the locations where the measurements are retrieved from affect the reconstruction performance. In this paper, we consider the design of...
Sensor networks with mobile access: energy and capacity considerations (2004)
Gökhan Mergen, Qing Zhao, Lang Tong
Abstract—Sensor network with mobile access (SENMA) is an architecture in which randomly deployed low-power sensors are orchestrated by a few powerful mobile access points (APs). This paper...
Abstract — In this paper we study the maximum asymptotic stable throughput of an opportunistic slotted ALOHA protocol. We provide a characterization of the maximum stable throughput as the number...
Asymptotic locally optimal detector for large-scale sensor networks under the Poisson regime (2004)
We consider distributed detection with a large number of identical sensors deployed over a region where the phenomenon of interest (POI) has unknown spatially varying strength. Each sensor makes a...
Abstract — The effect of medium access control (MAC) for information retrieval on signal field reconstruction in large-scale sensor networks with finite density is analyzed. Two MAC schemes are...
A medium access control (MAC) protocol for spread-spectrum ad hoc networks with dynamic channel allocation (DCA) is presented. DCA can support large systems with a smaller number of channels by...
A new blind channel estimation technique is proposed for space-time coded wideband CDMA systems using aperiodic and possibly multirate spreading codes. Using a decorrelating front end, the received...
Douglas S. Chan, Toby Berger, Lang Tong
With the improvement of the physical layer’s ability to receive multiple packets sent simultaneously, the classical collision channel model no longer applies and a general MPR model should be...
Asymptotic locally optimal detector for large-scale sensor networks under the Poisson regime (2004)
Abstract — We consider the distributed detection problem with a large number of identical sensors deployed over a region where the phenomenon of interest (POI) has different signal strength...
Blind Channel Estimation for Space-Time Coded WCDMA (2004)
Youngchul Sung, Lang Tong, Ananthram Swami
A new blind channel estimation technique is proposed for space-time coded wideband CDMA systems using aperiodic and possibly multirate spreading codes. Using a decorrelating front end, the received...
QoS Specific Medium Access Control for Wireless Sensor Network with Fading (2003)
A new MAC protocol is proposed for the reachback operation in a wireless sensor network deployed for reconstructing a random field. Referred to as QUality-of-service specific Information REtrieval...
Cutoff rate analysis of the Gauss-Markov fading channel with adaptive energy allocation (2003)
Saswat Misra, Ananthram Swami, Lang Tong
We use the cutoff rate to analyze reliable rates over the firstorder Guass-Markov fading channel when an optimized pilot-symbol assisted modulation (PSAM) scheme is used to provide partial CSI to the...
Sensor Networks with Mobile Agents (2003)
Lang Tong, Qing Zhao, Srihari Adireddy
An architecture for large scale low power sensor network is pro-posed. Referred to as sensor networh with mobile agents (SENMA). SENMA exploit node redundancies by introducing mobile agents that...
A multiqueue service room MAC protocol for wireless networks with multipacket reception (2003)
Qing Zhao, Lang Tong, Senior Member
Abstract—An adaptive medium-access control (MAC) protocol for heterogeneous networks with finite population is proposed. Referred to as the multiqueue service room (MQSR) protocol, this scheme is...
We study the stability and the capacity problems in packetized wireless networks. Communication medium is modelled using probability density functions that determine the packet reception...
We study the stability and the capacity problems in packetized wireless networks. Communication medium is modelled using probability density functions that determine the packet reception...
Channel Estimation under Asynchronous Packet Interference (2003)
This paper investigates the placement of training symbols within data packets of a wireless system in which transmissions are subject to asynchronous interference. The minimum mean square error of...
Optimal placement of known symbols for slowly varying frequency selective channels (2003)
The problem of placing known symbols in a data stream for a slowly varying frequency selective channel is considered from an information-theoretic perspective. Given the amount of redundancy...
Channel Estimation under Asynchronous Packet Interference (2003)
This paper investigates the placement of training symbols within data packets of a wireless system in which transmissions are subject to asynchronous interference. The minimum mean square error of...
Optimal Pilot Placement for Time-Varying Channels,” ACSP TR-01-03-02 (2003)
Min Dong, Lang Tong, Brian M. Sadler
Two major training techniques for wireless channels are time division multiplexed (TDM) training and superimposed training. For the TDM schemes with regular periodic placements (RPP), the closed-form...
Optimal Pilot Placement for Time-Varying Channels,” ACSP TR-01-03-02 (2003)
Min Dong, Lang Tong, Brian M. Sadler
Two major training techniques for wireless channels are time division multiplexed (TDM) training and superimposed training. For the TDM schemes with regular periodic placements (RPP), the closed-form...
We study the stability and the capacity problems in packetized wireless networks. Communication medium is modelled using probability density functions that determine the packet reception...
Cross-layer designs of multichannel reservation MAC under Rayleigh fading (2003)
Atul Maharshi, Lang Tong, Ananthram Swami
We consider a reservation-based medium access control (MAC) scheme where users reserve data channels through a slotted-ALOHA procedure. The base station grants access to users in a Rayleigh fading...
Optimal Pilot Placement for Time-Varying Channels,” ACSP TR-01-03-02 (2003)
Two major training techniques for wireless channels are the timedivision multiplexed (TDM) training and the superimposed training. For the TDM schemes with regular periodic placements (RPP), the...
Opportunistic ALOHA and Cross Layer Design for Sensor Networks (2003)
Parvathinathan Venkitasubramaniam, Srihari Adireddy, Lang Tong
We propose a novel distributed medium access control scheme called opportunistic ALOHA for reachback in sensor networks with mobile agents. Each sensor transmits its information with a probability...
Stability and Delay of Finite User Slotted ALOHA with Multipacket Reception (2003)
Vidyut Naware, Gökhan Mergen, Lang Tong
The effect of Multipacket Reception (MPR) on stability and delay of slotted ALOHA based random access systems is considered. A general asymmetric MPR model is introduced and the MAC capacity region...
Cross-Layer Designs of Multichannel Reservation MAC under Rayleigh Fading (2003)
Atul Maharshi, Lang Tong, Ananthram Swami, Senior Member, Senior Member
We consider a reservation-based medium access control (MAC) scheme where users reserve data channels through a slotted-ALOHA procedure. The base station grants access to users in a Rayleigh fading...
Delay Analysis of Slotted ALOHA in Capture Channels for the Two User Case (2003)
We consider the e#ect of capture on delay in bu#ered slotted ALOHA based random access systems for the two user case. In a capture channel, at most one user can have a successful packet transmission...
Capacity Considerations for Sensor Networks with Mobile Agents (2003)
We study the capacity of sensor networks with mobile agents. We look at the problem from information theory perspective, and optimize various network parameters such as coverage area, flying...
We study the stability and the capacity problems in packetized wireless networks. Communication medium is modeled using probability density functions that determine the packet reception...
Sensor Networks with Mobile Agents (2003)
Lang Tong, Qing Zhao, Srihari Adireddy
An architecture for large scale low power sensor network is proposed. Referred to as sensor networks with mobile agents (SENMA), SENMA exploit node redundancies by introducing mobile agents that...
Min Dong, Lang Tong, Brian M. Sadler
We consider the problem of reconstructing a signal field measured by a large scale sensor network with mobile agents.
L.Tong, “Sensitivity and Coding of Opportunistic ALOHA in Sensor Networks with Mobile Access (2003)
Parvathinathan Venkitasubramaniam, Lang Tong
Abstract. We consider a distributed medium access protocol, Opportunistic ALOHA, for reachback in sensor networks with mobile access points (AP). We briefly discuss some properties of the protocol,...
Stability and delay of finite user slotted ALOHA with multipacket reception (2003)
Vidyut Naware, Gökhan Mergen, Lang Tong
The effect of Multipacket Reception (MPR) on stability and delay of slotted ALOHA based random access systems is considered. A general asymmetric MPR model is introduced and the MAC capacity region...
Channel Estimation under Asynchronous Packet Interference (2003)
Cristian Budianu, Student Member, Lang Tong, Senior Member
Abstract—This paper investigates the placement of training symbols within the data packets of a wireless system in which transmissions are subject to asynchronous interference. The minimum mean...
The Impact of MAC Design on Estimation of Spatial Markov Process in Sensor Networks (2003)
Min Dong, Lang Tong, Brian M. Sadler
We investigate the impact of medium access control (MAC) design on the reconstruction performance of one-dimensional signal field in large scale sensor networks. Two types of MAC schemes are...
Stability and Delay of Finite User Slotted ALOHA with Multipacket Reception (2003)
Vidyut Naware, Gökhan Mergen, Lang Tong
The effect of Multipacket Reception (MPR) on stability and delay of slotted ALOHA based random access systems is considered. A general asymmetric MPR model is introduced and the MAC capacity region...
BLIND CHANNEL TRACKING FOR LONG-CODE WCDMA WITH LINEAR INTERPOLATION MODEL (2002)
A new technique for tracking of fast fading channels in long code CDMA is proposed exploiting multipath diversity of mobile channels. Based on a linear interpolation model, the proposed method...
CHANNEL TRACKING FOR FAST FADING LONG-CODE WCDMA (2002)
A new technique for tracking of fast fading channels in long code CDMAis proposed. Using a linear interpolation model, the proposed method tracks the time-varying channel without pilot symbols or...
A PROJECTION-BASED SEMI-BLIND CHANNEL ESTIMATION FOR LONG-CODE WCDMA (2002)
Proceedings of International Conference on Acoustics, Speech and Signal Processing (CASSP'02) (13-17 May 2002 : Orlando, FL, USA)
[Journal of VLSI Signal Processing Systems for Signal, Image, and Video Technology] (2002)
Poor, H. Vincent (ed.), Tong, Lang (ed.)
Reimpresión de una edición especial de la revista Journal of VLSI Signal Processing Systems for Signal, Image, and Video Technology que corresponde al volumen 30, números 1-3 de enero de 2002.
Signal Processing for Wireless Communication Systems (2002)
Poor, H. Vincent (ed.), Tong, Lang (ed.)
0-7923-7691-9
A Performance Comparison Between Ad Hoc and Centrally Controlled CDMA Wireless LANs (2002)
Jeffrey Q. Bao, Lang Tong, Senior Member
Abstract—A performance comparison is presented between two types of code-division multiple-access wireless local area networks: centrally controlled and ad hoc networks. Based on a...
L.Tong, “Optimal Transmission Probabilities for Slotted ALOHA in Fading Channels (2002)
Abstract-- We consider the uplink of a cellular sys-tem where M mobiles transmit over a common chan-nel to a base station. We assume that the mobiles use a modified slotted ALOHA protocol to access...
Dynamic channel allocation and optimal detection for MAC in CDMA ad hoc networks (2002)
Abstract--A medium-access control (MAC) protocol for spread-spectrum ad-hoc networks with Dynamic Channel Allocation (DCA) is presented. DCA can support large sys-tems with smaller spreading gains by...
Channel Estimation for Space-Time Orthogonal Block Codes (2002)
Cristian Budianu, Student Member, Lang Tong, Senior Member
Abstract—Channel estimation is one of the key components of space-time systems design. The transmission of pilot symbols, referred to as training, is often used to aid channel acquisition. In this...
Optimal pilot placement for channel tracking (2002)
Min Dong, Lang Tong, Brian M. Sadlet
The problem of optimally placing pilot symbols for tracking frequency selective fading channels in an OFDM system is considered. The time-varying channel is approximated as a Gauss-Markov process....
Optimal placement of training for frequency-selective block-fading channels (2002)
Srihari Adireddy, Student Member, Lang Tong, Senior Member, Harish Viswanathan
Abstract—The problem of placing training symbols optimally for orthogonal frequency-division multiplexing (OFDM) and single-carrier systems is considered. The channel is assumed to be quasi-static...
Stability of Queues in Slotted Aloha with Multiple Antennas (2002)
We consider the problem of stability of slotted ALOHA for a system consisting of N users communicating with a common receiver, that is capable of receiving multiple transmissions simultaneuosly. We...
Optimal Design and Placement of Pilot Symbols for Channel Estimation (2002)
The problem of design and placing pilot symbols for the estimation of frequency selective random channels is considered. For both SISO and MIMO channels, the Cramér-Rao Bound (CRB) on the mean...
Training placement for tracking fading channels (2002)
The problem of training symbol placement in data packets for channel tracking is considered, where the channel is time-varying Rayleigh flat fading. We use the minimum mean-square error (MMSE)...
Optimal Design and Placement of Pilot Symbols for Channel Estimation (2002)
Min Dong, Student Member, Lang Tong, Senior Member
Abstract—The problem of designing and placing pilot symbols for the estimation of frequency-selective random channels is considered. The channel is assumed to be a block-fading model with finite...
decorrelating RAKE receiver for long code WCDMA (2002)
Lang Tong, Senior Member, Senior Member, Patrick Dewilde
Abstract—The problem of blind and semiblind channel estimation and symbol detection is considered for long-code wideband code division multiple access (CDMA) systems, including systems with...
Packet Separation in Wireless Ad-Hoc Networks by Known Modulus Algorithms (2002)
this paper, we present a new technique that allows packet separation in asynchronous ad-hoc networks. As illustrated in figure 1, the user of interest transmits a constant modulus signal multiplied...
Packet Separation In Wireless Ad-Hoc Networks By Known Modulus (2002)
this paper, we present a new technique that allows packet separation in asynchronous ad-hoc networks. As illustrated in figure 1, the user of interest transmits a constant modulus signal multiplied...
Optimal Placement of Training for Unknown Channels (2001)
Srihaxi Adireddy, Lang Tong, Haxish Viswanathan
Abstract-- The problem of placing training symbols optimally for Single-Carrier Systems and OFDM is considered. The channel is assumed to be quasi-static with a finite impulse response of length...
Optimal placement of known symbols for nonergodic broadcast channels (2001)
Abstract-- The problem of placing known symbols in a data stream for a nonergodic broadcast inter symbol interference (ISI) channel is considered from an information-theoretic perspective. Given the...
Optimal embedding of known symbols for OFDM (2001)
srihari,ltong¨ The � � problem of placing known symbols optimally for OFDM is � considered. The channel is � assumed to be quasi-static with � a � � finite impulse response. Under the...
Channel estimation and equalization with block interleavers (2001)
Abstract-- The problem of channel estimation and equalization is considered for the block interleaved transmission over diversity channels. Effects on channel estimation and equalization from the...
Capacity of Regular Ad Hoc Networks with Multipacket Reception (2001)
In this paper, the effects of multipacket reception (MPR) capability on the capacity of wireless networks with regular structures are analyzed. Under uniform traffic and minimum connectivity, the...
Joint channel and symbol estimation by oblique projections (2001)
e-mail:{xia ng, ltong}ee.cornell.edu Abstract-- The problem of simultaneous channel and symbol estimation of a single input multiple output communication channel is considered in this paper. Three...
Capacity of Regular Ad Hoc Networks with Multipacket Reception (2001)
In this paper, the effects of multipacket reception (MPR) capability on the capacity of wireless networks with regular structures are analyzed. Under uniform traffic and minimum connectivity, the...
Optimal placement of training for channel estimation and tracking (2001)
The problem of training symbol placement for the estimation of block-fading channel is first considered. The channel is frequency selective with correlated random taps. The Cramér-Rao Bound (CRB) on...
Optimal embedding of known symbols for OFDM (2001)
The problem of placing known symbols optimally for OFDM is considered. The channel is assumed to be quasi-static with a finite impulse response. Under the assumption that neither the transmitter and...
An adaptive medium access control (MAC) protocol for heterogeneous networks with finite population is proposed. Referred to as the Multi-Queue Service Room (MQSR) protocol, this scheme is capable of...
Detection with embedded known symbols: Optimal symbol placement and equalization (2000)
The detection of a data sequence with embedded known symbols is considered. For a class of symbol-by-symbol decision feedback receivers, known symbol distributions optimal with respect to the...
A Dynamic Queue MAC Protocol for Random Access Channels with Multipacket Reception (2000)
A dynamic medium access control (MAC) protocol for a finite-user slotted channel with multipacket reception (MPR) capability is proposed. By adaptively changing the size of the contention class...
Online adaptive reinitialization of the constant modulus algorithm (2000)
Abstract—An adaptive reinitialization algorithm for the constant modulus algorithm is proposed that relies on the similarities between the constant modulus and the Wiener equalizer and expands the...
VectorCM stable equilibrium analysis (2000)
Azzédine Touzni, Lang Tong, Raúl A. Casas, C. Richard Johnson
Abstract—The vector-constant modulus (VCM) criterion is an extension of the constant modulus (CM) criterion [2] introduced recently for equalization of channels involving Gaussian sources [1], [5]....
An analysis of constant modulus algorithm for array signal processing (1999)
The constant modulus (CM) cost function is analyzed for array signal processing. The analysis includes arbitrary source types. It is shown that CM receivers have the signal space property except in...
Geometrical characterizations of constant modulus receivers (1999)
Ming Gu, Student Member, Lang Tong
Abstract — Convergence properties of the constant modulus (CM) and the Shalvi–Weinstein (SW) algorithms in the presence of noise remain largely unknown. A new geometrical approach to the analysis...
An analysis of constant modulus receivers (1999)
Hanks H. Zeng, Lang Tong, C. Richard Johnson
Abstract — This paper investigates connections between (nonblind) Wiener receivers and blind receivers designed by minimizing the constant modulus (CM) cost. Applicable to both T-spaced and...
The aim of this research is to develop new theory and techniques that significantly improve performance of ad hoc networks by advanced signal processing and medium access control (MAC). In...
Rate-Optimal Signal Design for Wireless Communications (1998)
Misra, Saswat, Swami, Ananthram, Tong, Lang
In a tactical communications scenario, the transmitter will only have an imperfect estimate of the temporally correlated mobile RF channel. Given imperfect channel state information (CSI), we address...
Change Detection and Estimation in Large Scale Sensor Networks: Linear Complexity Algorithms (1998)
He, Ting, Ben-David, Shai, Tong, Lang
We propose algorithms for nonparametric sample-based spacial change detection and estimation in large scale sensor networks. We collect random samples containing the location of sensors and their...
Wonzoo Chung, Ming Gu, C. Richard Johnson, Lang Tong
The constant modulus algorithm (CMA) is an effective and popular scheme for blind adaptive equalization. Delineation of the regions of convergence of this multimodal algorithm has remained as an...
Multichannel blind identification: from subspace to maximum likelihood methods (1998)
A review of recent blind channel estimation algorithms is presented. From the (second-order) moment-based methods to the maximum likelihood approaches, under both statistical and deterministic signal...
Relationships between the constant modulus and Wiener receivers (1998)
Hanks H. Zeng, Student Member, Lang Tong, C. Richard Johnson
Abstract — The Godard or the constant modulus algorithm (CMA) is an effective technique for blind receiver design in communications. However, due to the complexity of the Constant Modulus (CM) cost...
Blind channel estimation using the secondorder statistics: algorithms (1997)
Hanks H. Zeng, Student Member, Lang Tong
Abstract—Most second-order moment-based blind channel estimators belong to two categories: i) optimal correlation/spectral fitting techniques and ii) eigenstructure-based techniques. These two...
Blind channel estimation using the secondorder statistics: algorithms (1997)
Hanks H. Zeng, Student Member, Lang Tong
Abstract — In this paper, we consider the asymptotic performance and fundamental limitations of the class of blind estimators that use the second-order statistics. An achievable lower bound of the...
Recent Developments in Blind Channel Equalization: From Cyclostationarity to Subspaces (1996)
Hui Liu, Guanghan Xu, Lang Tong, Thomas Kailath
Since Tong, Xu and Kailath [1] demonstrated the feasibility of identifying possibly nonminimum phase channels using second-order statistics, considerable research activ-ity, both in algorithm...
Blind channel identification based on second-order statistics: a frequency-domain approach (1995)
Tong, Lang, Xu, Guanghan, Hassibi, B., Kailath, T.
In this communication, necessary and sufficient conditions are presented for the unique blind identification of possibly nonminimum phase channels driven by cyclostationary processes. Using a...
Blind Channel Identification Based on Second-Order Statistics: A Frequency-Domain Approach (1995)
Lang Tong, Guanghan Xu, Student Member, T. Kailath
Abstract-- In this communication, necessary and sufficient conditions are presented for the unique blind ideutification of possibly nonminimum phase channels driven by cyclostationary processes....
Blind Sequence Estimation (1995)
Abstract--Estimating the data sequence from the received g,gnal without knowing the transmission channel is referred to as blind sequence estimation. A new blind sequence estimation scheme is...
Lang Tong, Guanghan Xu, Thomas Kailath, Fellow Ieee
Abstract--A new blind channel identification and equalization method is proposed that exploits the cyclostationarity of oversampled communication signals to achieve identification and equalization of...
Blind channel identification and blind signal estimation /--by Lang Tong. (1990)
Thesis (Ph. D.)--University of Notre Dame, 1990.