An improved link model for window flow control and its application to FAST TCP (2009)
Jacobsson, Krister, Andrew, Lachlan L. H., Tang, Ao (Kevin), Low, Steven H., Hjalmarsson, Håkan
This paper presents a link model which captures the queue dynamics in response to a change in a transmission control protocol (TCP) source's congestion window. By considering both self-clocking and...
An Improved Link Model for Window Flow Control and Its Application to FAST TCP (2009)
Jacobsson, Krister, Andrew, Lachlan L. H., Tang, Ao (Kevin), Low, Steven H., Hjalmarsson, Håkan
This paper presents a link model which captures the queue dynamics in response to a change in a transmission control protocol (TCP) source's congestion window. By considering both self-clocking and...
Tang, Ao, Andrew, Lachlan L. H., Chiang, Mung, Low, Steven H.
The transport layer manages the end-to-end transportation of packets across a network. Its role is to connect application processes running on end hosts as seamlessly as possible, as if the two end...
An improved link model for window flow control and its application to FAST TCP (2009)
Jacobsson, Krister, Andrew, Lachlan L. H., Tang, Ao, Low, Steven H., Hjalmarsson, Hakan
This paper presents a link model which captures the queue dynamics in response to a change in a TCP source's congestion window. By considering both self-clocking and the link integrator effect, the...
Understanding XCP: equilibrium and fairness (2009)
Andrew, Lachlan L. H., Low, Steven H., Wydrowski, Bartek P.
Abstract not yet available.
Congestion control using efficient explicit feedback (2009)
Qazi, Ihsan A., Andrew, Lachlan L. H., Znati, Taieb
Abstract not yet available.
Power-aware speed scaling in processor sharing systems (2009)
Wierman, Adam, Andrew, Lachlan L. H., Tang, Ao
Abstract not yet available.
Minimizing average finish time in P2P networks (2009)
Ezovski, G. Matthew, Tang, Ao, Andrew, Lachlan L. H.
Abstract not yet available.
An improved link model for window flow control and its application to FAST TCP (2009)
Jacobsson, Krister, Andrew, Lachlan L. H., Tang, Ao, Low, Steven H., Hjalmarsson, Hakan
This paper presents a link model which captures the queue dynamics in response to a change in a TCP source's congestion window. By considering both self-clocking and the link integrator effect, the...
Understanding XCP: equilibrium and fairness (2009)
Andrew, Lachlan L. H., Low, Steven H., Wydrowski, Bartek P.
Abstract not yet available.
Power-aware speed scaling in processor sharing systems (2009)
Wierman, Adam, Andrew, Lachlan L. H., Tang, Ao
Energy use of computer communication systems has quickly become a vital design consideration. One effective method for reducing energy consumption is dynamic speed scaling, which adapts the...
Tang, Ao, Andrew, Lachlan L. H., Chiang, Mung, Low, Steven H.
The transport layer manages the end-to-end transportation of packets across a network. Its role is to connect application processes running on end hosts as seamlessly as possible, as if the two end...
Minimizing average finish time in P2P networks (2009)
Ezovski, G. Matthew, Tang, Ao, Andrew, Lachlan L. H.
Peer-to-peer (P2P) file distribution is a scalable way to disseminate content to a wide audience. For a P2P network, one fundamental performance metric is the average time needed to deliver a certain...
Congestion control using efficient explicit feedback (2009)
Qazi, Ihsan Ayyub, Znati, Taieb, Andrew, Lachlan L. H.
This paper proposes a framework for congestion control, called Binary Marking Congestion Control (BMCC) for high bandwidth-delay product networks. The basic components of BMCC are i) a packet marking...
Towards a bufferless optical internet (2009)
Wong, Eric Wing Ming, Andrew, Lachlan L. H., Cui, Tony, Moran, Bill, Zalesky, Andrew, Tucker, Rodney S., ...
This paper investigates the relationship between buffer size and long-term average TCP performance in dense wavelength division multiplexing (DWDM) networks. By investigating TCP NewReno, we...
Performance analysis of best-effort service in saturated IEEE 802.16 networks (2009)
Vu, Hai L., Chan, Sammy, Andrew, Lachlan L. H.
The IEEE 802.16 standard is a promising technology for the fourth-generationmobile networks and is being actively promoted by the WiMAX Forum, an industry-led consortium. Among the various service...
Connectivity, coverage and placement in wireless sensor networks (2009)
Li, Ji, Andrew, Lachlan L. H., Foh, Chuan Heng, Zukerman, Moshe, Chen, Hsiao-Hwa
Wireless communication between sensors allows the formation of flexible sensor networks, which can be deployed rapidly over wide or inaccessible areas. However, the need to gather data from all...
A Generalized FAST TCP scheme (2008)
Yuan, Cao, Tan, Liansheng, Andrew, Lachlan L. H., Zhang, Wei, Zukernan, Moshe
Active Queue Management for Fair Resource Allocation in Wireless Networks (2008)
Andrew, Lachlan L. H., Hanly, Stephen V., Mukhtar, Rami G.
This paper investigates the interaction between end-to-end flow control and MAC-layer scheduling on wireless links. We consider a wireless network with multiple users receiving information from a...
A generalized FAST TCP scheme (2008)
Yuan, Cao, Tan, Liansheng, Andrew, Lachlan L. H., Zhang, Wei, Zukerman, Moshe
FAST TCP has been shown to be promising in terms of system stability, throughput and fairness. However, it requires buffering which increases linearly with the number of flows bottlenecked at a link....
Game theory for heterogeneous flow control (2008)
Tang, Ao, Andrew, Lachlan L. H.
A general framework is developed for networks with flows that use all available congestion signals to regulate their rates. It is conceptually a generalization of the existing network utility...
ACK-clocking dynamics: modelling the interaction between windows and the network (2008)
Jacobsson, Krister, Andrew, Lachlan L. H., Tang, Ao, Johansson, Karl H., Hjalmarsson, Hakan, Low, Steven H.
A novel continuous time fluid flow model of the dynamics of the interaction between ACK-clocking and the link buffer is presented. A fundamental integral equation relating the instantaneous flow rate...
Active queue management for fair resource allocation in wireless networks (2008)
Andrew, Lachlan L. H., Hanly, Stephen V., Mukhtar, Rami G.
This paper investigates the interaction between end-to-end flow control and medium access control (MAC)-layer scheduling on wireless links. We consider a wireless network with multiple users...
Progress on pricing with peering (2008)
Lee, Eui-Woong, Buchfuhrer, David, Andrew, Lachlan L. H., Tang, Ao, Low, Steven H.
This paper examines a simple model of how a provider ISP charges customer ISPs by assuming the provider ISP wants to maximize its revenue when customer ISPs have the possibility of setting up peering...
To be fair or efficient or a bit of both (2008)
Zukerman, Moshe, Mammadov, Musa, Tan, Liansheng, Ouveysi, Iradj, Andrew, Lachlan L. H.
Introducing a new concept of (α,β)-fairness, which allows for a bounded fairness compromise, so that a source is allocated a rate neither less than 0 ≤α≤ nor more than β≥ times its fair...
Window flow control: macroscopic properties from microscopic factors (2008)
Tang, Ao, Andrew, Lachlan L. H., Jacobsson, Krister, Johansson, Karl H., Low, Steven H., Hjalmarsson, Hakan
This paper studies window flow control focusing on bridging the gap between microscopic factors such as burstiness in sub-RTT timescales, and observable macroscopic properties such as steady state...
Sizes of minimum connected dominating sets of a class of wireless sensor networks (2008)
Li, Ji, Foh, Chuan Heng, Andrew, Lachlan L. H., Zukerman, Moshe
We consider an important performance measure of wireless sensor networks, namely, the least number of nodes, N, required to facilitate routing between any pair of nodes, allowing other nodes to...
Experimental evaluation of delay/loss-based TCP congestion control algorithms (2008)
Leith, Douglas J., Andrew, Lachlan L. H., Quetchenbach, Tom, Shorten, Robert N., Lavi, Kfir
We present initial experimental results for TCP Illinois and Compound TCP. These tests are for relatively simple scenarios yet they are sufficient to highlight several interesting issues. We observe...
Min-min times in peer-to-peer file sharing networks (2008)
Ezovski, G. Matthew, Tang, Ao, Anandkumar, Animashree, Andrew, Lachlan L. H.
Abstract not available.
Implementation of provably stable MaxNet (2008)
Suchara, Martin, Andrew, Lachlan L. H., Witt, Ryan, Jacobsson, Krister, Wydrowski, Bartek P., Low, Steven H.
MaxNet TCP is a congestion control protocol that uses explicit multi-bit signalling from routers to achieve desirable properties such as high throughput and low latency. In this paper we present an...
Stochastic analysis of power-aware scheduling (2008)
Wierman, Adam, Andrew, Lachlan L. H., Tang, Ao
Energy consumption in a computer system can be reduced by dynamic speed scaling, which adapts the processing speed to the current load. This paper studies the optimal way to adjust speed to balance...
Qazi, Ihsan A., Andrew, Lachlan L. H., Znati, Taieb
We design a congestion control protocol that uses the existing IP ECN bits to achieve efficient and fair bandwidth allocations on high Bandwidth-Delay Product (BDP) paths while maintaining low...
Towards a common TCP evaluation suite (2008)
Andrew, Lachlan L. H., Marcondes, Cesar, Floyd, Sally, Dunn, Lawrence, Guillier, Romaric, Gang, Wang, ...
This document presents an evaluation test suite for the initial evaluation of proposed TCP modifications. The goal of the test suite is to allow researchers quickly and easily to evaluate their...
Sizes of minimum connected dominating sets of a class of wireless sensor networks (2008)
Li, Ji, Foh, Chuan Heng, Andrew, Lachlan L. H., Zukerman, Moshe
We consider an important performance measure of wireless sensor networks, namely, the least number of nodes, N, required to facilitate routing between any pair of nodes, allowing other nodes to...
Experimental evaluation of delay/loss-based TCP congestion control algorithms (2008)
Leith, Douglas J., Andrew, Lachlan L. H., Quetchenbach, Tom, Shorten, Robert N., Lavi, Kfir
We present initial experimental results for TCP Illinois and Compound TCP. These tests are for relatively simple scenarios yet they are sufficient to highlight several interesting issues. We observe...
Min-min times in peer-to-peer file sharing networks (2008)
Ezovski, G. Matthew, Tang, Ao, Anandkumar, Animashree, Andrew, Lachlan L. H.
Abstract not available.
A generalized FAST TCP scheme (2008)
Yuan, Cao, Tan, Liansheng, Andrew, Lachlan L. H., Zhang, Wei, Zukerman, Moshe
FAST TCP has been shown to be promising in terms of system stability, throughput and fairness. However, it requires buffering which increases linearly with the number of flows bottlenecked at a link....
Implementation of provably stable MaxNet (2008)
Suchara, Martin, Andrew, Lachlan L. H., Witt, Ryan, Jacobsson, Krister, Wydrowski, Bartek P., Low, Steven H.
MaxNet TCP is a congestion control protocol that uses explicit multi-bit signalling from routers to achieve desirable properties such as high throughput and low latency. In this paper we present an...
Stochastic analysis of power-aware scheduling (2008)
Wierman, Adam, Andrew, Lachlan L. H., Tang, Ao
Energy consumption in a computer system can be reduced by dynamic speed scaling, which adapts the processing speed to the current load. This paper studies the optimal way to adjust speed to balance...
Qazi, Ihsan A., Andrew, Lachlan L. H., Znati, Taieb
We design a congestion control protocol that uses the existing IP ECN bits to achieve efficient and fair bandwidth allocations on high Bandwidth-Delay Product (BDP) paths while maintaining low...
Game theory for heterogeneous flow control (2008)
Tang, Ao, Andrew, Lachlan L. H.
A general framework is developed for networks with flows that use all available congestion signals to regulate their rates. It is conceptually a generalization of the existing network utility...
ACK-clocking dynamics: modelling the interaction between windows and the network (2008)
Jacobsson, Krister, Andrew, Lachlan L. H., Tang, Ao, Johansson, Karl H., Hjalmarsson, Hakan, Low, Steven H.
A novel continuous time fluid flow model of the dynamics of the interaction between ACK-clocking and the link buffer is presented. A fundamental integral equation relating the instantaneous flow rate...
Towards a common TCP evaluation suite (2008)
Andrew, Lachlan L. H., Marcondes, Cesar, Floyd, Sally, Dunn, Lawrence, Guillier, Romaric, Gang, Wang, ...
This document presents an evaluation test suite for the initial evaluation of proposed TCP modifications. The goal of the test suite is to allow researchers quickly and easily to evaluate their...
Active queue management for fair resource allocation in wireless networks (2008)
Andrew, Lachlan L. H., Hanly, Stephen V., Mukhtar, Rami G.
This paper investigates the interaction between end-to-end flow control and medium access control (MAC)-layer scheduling on wireless links. We consider a wireless network with multiple users...
Progress on pricing with peering (2008)
Lee, Eui-Woong, Buchfuhrer, David, Andrew, Lachlan L. H., Tang, Ao, Low, Steven H.
This paper examines a simple model of how a provider ISP charges customer ISPs by assuming the provider ISP wants to maximize its revenue when customer ISPs have the possibility of setting up peering...
To be fair or efficient or a bit of both (2008)
Zukerman, Moshe, Mammadov, Musa, Tan, Liansheng, Ouveysi, Iradj, Andrew, Lachlan L. H.
Introducing a new concept of (α,β)-fairness, which allows for a bounded fairness compromise, so that a source is allocated a rate neither less than 0 ≤α≤ nor more than β≥ times its fair...
Window flow control: macroscopic properties from microscopic factors (2008)
Tang, Ao, Andrew, Lachlan L. H., Jacobsson, Krister, Johansson, Karl H., Low, Steven H., Hjalmarsson, Hakan
This paper studies window flow control focusing on bridging the gap between microscopic factors such as burstiness in sub-RTT timescales, and observable macroscopic properties such as steady state...
Experimental Evaluation of delay/loss-based TCP ongestion control algorithms (2008)
Leith, Douglas J., Andrew, Lachlan L. H., Quetchenbach, Tom, Shorten, Robert N.
We present initial experimental results for TCP Illinois and Compound TCP. These tests are for relatively simple scenarios yet they are sufficient to highlight several interesting issues. We observe...
An accurate link model and its application to stability analysis of FAST TCP (2007)
Tang, Ao, Jacobsson, Krister, Andrew, Lachlan L. H., Low, Steven H.
This paper presents a link model which captures the queue dynamics when congestion windows of TCP sources change. By considering both the self-clocking and the link integrator effects, the model is a...
Opportunistic source coding for data gathering in wireless sensor networks (2007)
Cui, Tao, Chen, Lijun, Ho, Tracey, Low, Steven H., Andrew, Lachlan L. H.
We propose a jointly opportunistic source coding and opportunistic routing (OSCOR) protocol for correlated data gathering in wireless sensor networks. OSCOR improves data gathering efficiency by...
WAN-in-Lab: motivation, deployment and experiments (2007)
Lee, George S., Andrew, Lachlan L. H., Tang, Ao, Low, Steven H.
WAN-in-Lab is a hardware testbed for the design, development, testing and evaluation of high speed network protocols. It uses real carrier-class networking hardware to avoid the artifacts introduced...
Pricing in the presence of peering (2007)
Lee, Eui-Woong, Buchfuhrer, David, Andrew, Lachlan L. H., Tang, Kevin, Low, Steven H.
This paper examines a simple model of how a provider ISP charges customer ISPs by assuming the provider ISP wants to maximize its revenue while customer ISPs have the possibility of setting up...
WAN-in-Lab: motivation, deployment and experiments (2007)
Lee, George S., Andrew, Lachlan L. H., Tang, Ao, Low, Steven H.
WAN-in-Lab is a hardware testbed for the design, development, testing and evaluation of high speed network protocols. It uses real carrier-class networking hardware to avoid the artifacts introduced...
Pricing in the presence of peering (2007)
Lee, Eui-Woong, Buchfuhrer, David, Andrew, Lachlan L. H., Tang, Kevin, Low, Steven H.
This paper examines a simple model of how a provider ISP charges customer ISPs by assuming the provider ISP wants to maximize its revenue while customer ISPs have the possibility of setting up...
An accurate link model and its application to stability analysis of FAST TCP (2007)
Tang, Ao, Jacobsson, Krister, Andrew, Lachlan L. H., Low, Steven H.
This paper presents a link model which captures the queue dynamics when congestion windows of TCP sources change. By considering both the self-clocking and the link integrator effects, the model is a...
Opportunistic source coding for data gathering in wireless sensor networks (2007)
Cui, Tao, Chen, Lijun, Ho, Tracey, Low, Steven H., Andrew, Lachlan L. H.
We propose a jointly opportunistic source coding and opportunistic routing (OSCOR) protocol for correlated data gathering in wireless sensor networks. OSCOR improves data gathering efficiency by...
Adaptive Deterministic Packet Marking (2006)
Andrew, Lachlan L. H., Hanly, Stephen V., Chan, Sammy, Cui, Tony
An efficient method is presented for signaling link price information using single-bit marks. It exploits side information in the IPid field of the IP header to allow the maximum price on a flow’s...
Improving the fairness of FAST TCP to new flows (2006)
Cui, Tony, Andrew, Lachlan L. H., Zukerman, Moshe, Tan, Liansheng
It has been observed that FAST TCP, and the related protocol TCP Vegas, suffer unfairness when many flows arrive at a single bottleneck link, without intervening departures. We show that the effect...
Improving the fairness of FAST TCP to new flows (2006)
Cui, Tony, Andrew, Lachlan L. H., Zukerman, Moshe, Tan, Liansheng
It has been observed that FAST TCP, and the related protocol TCP Vegas, suffer unfairness when many flows arrive at a single bottleneck link, without intervening departures. We show that the effect...
Adaptive deterministic packet marking (2006)
Andrew, Lachlan L. H., Hanly, Stephen V., Chan, Sammy, Cui, Tony
An efficient method is presented for signaling link price information using single-bit marks. It exploits side information in the IPid field of the IP header to allow the maximum price on a flow's...
Automatic laser shutdown implications for all optical data networks (2006)
Hinton, Kerry, Farrell, Peter, Zalesky, Andrew, Andrew, Lachlan L. H., Zukerman, Moshe
Generalized multiprotocol label switching (GMPLS), optical packet, and burst-switched networks in which the synchronous digital hierarchy/synchronous optical network (SDH/SONET) layer is removed may...
Meeting connectivity requirements in a wireless multihop network (2006)
Li, Ji, Andrew, Lachlan L. H., Foh, Chuan Heng, Zukerman, Moshe, Neuts, Marcel F.
This paper investigates the connectivity probability of 1-dimensional ad hoc networks in which nodes have random, non-identically distributed locations, this leads to optimization of the number of...
Price-based max-min fair rate allocation in wireless multi-hop networks (2006)
Tan, Liansheng, Zhang, Xiaomei, Andrew, Lachlan L. H., Chan, Sammy, Zukerman, Moshe
The interaction between links in wireless multihop networks introduces extra constraints on the combinations of achievable flow rates. Algorithms have been proposed to achieve max-min fairness under...
Phase noise compensation for OFDM WLAN systems using superimposed pilots (2006)
Varma, Angiras R., Athaudage, Chandra R. N., Andrew, Lachlan L. H., Manton, Jonathan H.
In this paper, a novel phase-error estimation technique for OFDM based WLAN system is proposed. The proposed technique utilizes superimposed (or embedded) pilots for phase-tracking within OFDM data...
Optimal superimposed pilot selection for OFDM channel estimation (2006)
Varma, Angiras R., Athaudage, Chandra R. N., Andrew, Lachlan L. H., Manton, Jonathan H.
This paper presents an optimal strategy for utilizing superimposed pilots for OFDM channel estimation using Wiener filtering. An algorithm is formulated to determine the optimal rectangular set of...
Joint allocation of subcarriers and transmit powers in a multiuser OFDM cellular network (2006)
Thanabalasingham, Thaya, Hanly, Stephen V., Andrew, Lachlan L. H., Papandriopoulos, John
In the present paper, we consider the problem of joint bandwidth (subcarriers) and power allocation for the downlink of a multi-user multi-cell OFDM cellular network. This resource allocation problem...
Improving the fairness of FAST TCP to new flows (2006)
Cui, Tony, Andrew, Lachlan L. H., Zukerman, Moshe, Tan, Liansheng
It has been observed that FAST TCP, and the related protocol TCP Vegas, suffer unfairness when many flows arrive at a single bottleneck link, without intervening departures. We show that the effect...
Adaptive deterministic packet marking (2006)
Andrew, Lachlan L. H., Hanly, Stephen V., Chan, Sammy, Cui, Tony
An efficient method is presented for signaling link price information using single-bit marks. It exploits side information in the IPid field of the IP header to allow the maximum price on a flow's...
Automatic laser shutdown implications for all optical data networks (2006)
Hinton, Kerry, Farrell, Peter, Zalesky, Andrew, Andrew, Lachlan L. H., Zukerman, Moshe
Generalized multiprotocol label switching (GMPLS), optical packet, and burst-switched networks in which the synchronous digital hierarchy/synchronous optical network (SDH/SONET) layer is removed may...
Meeting connectivity requirements in a wireless multihop network (2006)
Li, Ji, Andrew, Lachlan L. H., Foh, Chuan Heng, Zukerman, Moshe, Neuts, Marcel F.
This paper investigates the connectivity probability of 1-dimensional ad hoc networks in which nodes have random, non-identically distributed locations, this leads to optimization of the number of...
Optimal superimposed pilot selection for OFDM channel estimation (2006)
Varma, Angiras R., Athaudage, Chandra R. N., Andrew, Lachlan L. H., Manton, Jonathan H.
This paper presents an optimal strategy for utilizing superimposed pilots for OFDM channel estimation using Wiener filtering. An algorithm is formulated to determine the optimal rectangular set of...
Price-based max-min fair rate allocation in wireless multi-hop networks (2006)
Tan, Liansheng, Zhang, Xiaomei, Andrew, Lachlan L. H., Chan, Sammy, Zukerman, Moshe
The interaction between links in wireless multihop networks introduces extra constraints on the combinations of achievable flow rates. Algorithms have been proposed to achieve max-min fairness under...
Joint allocation of subcarriers and transmit powers in a multiuser OFDM cellular network (2006)
Thanabalasingham, Thaya, Hanly, Stephen V., Andrew, Lachlan L. H., Papandriopoulos, John
In the present paper, we consider the problem of joint bandwidth (subcarriers) and power allocation for the downlink of a multi-user multi-cell OFDM cellular network. This resource allocation problem...
Phase noise compensation for OFDM WLAN systems using superimposed pilots (2006)
Varma, Angiras R., Athaudage, Chandra R. N., Andrew, Lachlan L. H., Manton, Jonathan H.
In this paper, a novel phase-error estimation technique for OFDM based WLAN system is proposed. The proposed technique utilizes superimposed (or embedded) pilots for phase-tracking within OFDM data...
Evaluation of FAST TCP on low-speed DOCSIS-based access networks (2005)
Andrew, Lachlan L. H., Atov, Irene, Kennedy, David, Wydrowski, Bartek
There is strong evidence that the efficiency of the Internet is limited by its existing TCP congestion control system. A replacement, FAST, has been shown to improve performance in high-speed...
Buffer sizing for nonhomogeneous TCP sources (2005)
Andrew, Lachlan L. H., Cui, Tony, Sun, Jinsheng, Zukerman, Moshe, Ko, King-Tim, Chan, Sammy
Considering a single bottleneck model of TCP with a constant number of greedy and nonhomogeneous sources, and assuming that TCP timeouts do not occur, we establish necessary and sufficient...
Measurement-based band allocation in multiband CDMA (2005)
Multiband code division multiple access (sometimes called multicarrier CDMA) is a promising approach to increasing the capacity of CDMA networks, while maintaining compatibility with existing...
Understanding XCP: equilibrium and fairness (2005)
Low, Steven H., Andrew, Lachlan L. H., Wydrowski, Bartek P.
We prove that the XCP equilibrium solves a constrained max-min fairness problem by identifying it with the unique solution of a hierarchy of optimization problems, namely those solved by max-min fair...
Fairness comparison of FAST TCP and TCP Vegas (2005)
Andrew, Lachlan L. H., Tan, Liansheng, Cui, Tony, Zukerman, Moshe
This paper compares the equilibrium properties of FAST TCP and TCP Vegas. Although the two have the same equilibrium point when all sources know their true propagation delays, FAST is fairer when...
Iterative algorithms for channel identification using superimposed pilots (2005)
Varma, Angiras R., Andrew, Lachlan L. H., Athaudage, Chandra R. N., Manton, Jonathan H.
Channel identification of a time-varying channel is considered using superimposed training. A sequence of known symbols with lower power is arithmetically added to the information symbols before...
Price-based Max-Min Fair rate allocation in wireless multi-hop networks (2005)
Tan, Liansheng, Zhang, Xiaomei, Andrew, Lachlan L. H., Zukerman, Moshe
When allocating rates in wireless multi-hop networks, one difficulty comes from the so-called MAC (media access control) constraint. To overcome this difficulty, this paper proposes a price-based...
Thanabalasingham, Thaya, Hanly, Stephen V., Andrew, Lachlan L. H.
In this paper, we study a wireless network that has constant or slow-varying data rate requirements. The transmitters transmit to multiple receivers. The allocation of degrees of freedom (orthogonal...
CLAMP: active queue management at wireless access points (2005)
Andrew, Lachlan L. H., Hanly, Stephen V., Mukhtar, Rami G.
This paper investigates the performance of CLAMP, a distributed algorithm to enhance the performance of TCP connections that terminate in a wireless access network. CLAMP works at a receiver to...
MaxNet: an efficient Max-Mi fair allocation scheme (2005)
Nguyen, Duc D., Wang, Jidong, Andrew, Lachlan L. H., Chan, Sammy
It has been analytically proved that both MaxNet and SumNet can achieve max-min fair allocation in static networks. In SumNet networks, such as the TCP algorithm of the current Internet, the source...
Fairness comparison of FAST TCP and TCP Vegas (2005)
Andrew, Lachlan L. H., Tan, Liansheng, Cui, Tony, Zukerman, Moshe
This paper compares the equilibrium properties of FAST TCP and TCP Vegas. Although the two have the same equilibrium point when all sources know their true propagation delays, FAST is fairer when...
Evaluation of FAST TCP on low-speed DOCSIS-based access networks (2005)
Andrew, Lachlan L. H., Atov, Irene, Kennedy, David, Wydrowski, Bartek
There is strong evidence that the efficiency of the Internet is limited by its existing TCP congestion control system. A replacement, FAST, has been shown to improve performance in high-speed...
CLAMP: active queue management at wireless access points (2005)
Andrew, Lachlan L. H., Hanly, Stephen V., Mukhtar, Rami G.
This paper investigates the performance of CLAMP, a distributed algorithm to enhance the performance of TCP connections that terminate in a wireless access network. CLAMP works at a receiver to...
MaxNet: an efficient Max-Mi fair allocation scheme (2005)
Nguyen, Duc D., Wang, Jidong, Andrew, Lachlan L. H., Chan, Sammy
It has been analytically proved that both MaxNet and SumNet can achieve max-min fair allocation in static networks. In SumNet networks, such as the TCP algorithm of the current Internet, the source...
Iterative algorithms for channel identification using superimposed pilots (2005)
Varma, Angiras R., Andrew, Lachlan L. H., Athaudage, Chandra R. N., Manton, Jonathan H.
Channel identification of a time-varying channel is considered using superimposed training. A sequence of known symbols with lower power is arithmetically added to the information symbols before...
Buffer sizing for nonhomogeneous TCP sources (2005)
Andrew, Lachlan L. H., Cui, Tony, Sun, Jinsheng, Zukerman, Moshe, Ko, King-Tim, Chan, Sammy
Considering a single bottleneck model of TCP with a constant number of greedy and nonhomogeneous sources, and assuming that TCP timeouts do not occur, we establish necessary and sufficient...
Measurement-based band allocation in multiband CDMA (2005)
Multiband code division multiple access (sometimes called multicarrier CDMA) is a promising approach to increasing the capacity of CDMA networks, while maintaining compatibility with existing...
Understanding XCP: equilibrium and fairness (2005)
Low, Steven H., Andrew, Lachlan L. H., Wydrowski, Bartek P.
We prove that the XCP equilibrium solves a constrained max-min fairness problem by identifying it with the unique solution of a hierarchy of optimization problems, namely those solved by max-min fair...
Price-based Max-Min Fair rate allocation in wireless multi-hop networks (2005)
Tan, Liansheng, Zhang, Xiaomei, Andrew, Lachlan L. H., Zukerman, Moshe
When allocating rates in wireless multi-hop networks, one difficulty comes from the so-called MAC (media access control) constraint. To overcome this difficulty, this paper proposes a price-based...
Thanabalasingham, Thaya, Hanly, Stephen V., Andrew, Lachlan L. H.
In this paper, we study a wireless network that has constant or slow-varying data rate requirements. The transmitters transmit to multiple receivers. The allocation of degrees of freedom (orthogonal...
Fast simulation of wavelength continuous WDM networks (2004)
This paper considers the estimation of blocking probabilities of circuit-switched WDM networks with no wavelength converters and with fixed routing. It presents an importance sampling simulation...
FULL-RCMA: a high utilization EPON (2004)
Foh, Chuan Heng, Andrew, Lachlan L. H., Wong, Elaine, Zukerman, Moshe
This paper proposes an alternate solution for Ethernet passive optical networks. Our solution uses a novel protocol named full utilization local loop request contention multiple-access protocol to...
On routing in CDMA multihop cellular networks (2004)
Andrew, Lachlan L. H., Hanly, Stephen V.
In ad-hoc networks, the optimal hop size is a trade-off between the transmission errors and the number of hops required. This paper investigates the optimal hop size and transmission strategy in...
MaxNet: faster flow control convergence (2004)
Wydrowski, Bartek P., Andrew, Lachlan L. H., Mareels, Iven M. Y.
MaxNet is a distributed congestion control architecture in which only the most severely bottlenecked link on the end-to-end path controls the source rate. This paper shows that the small-signal...
Does header length affect performance in optical burst switched networks? (2004)
Vazquez-Abad, Felisa J., White, Jolyon A., Andrew, Lachlan L. H., Tucker, Rodney S.
We investigate the effect of nonnegligible header length (HL) in optical burst switching on blocking probability. The HL is the total delay of a control packet at the controller. We first develop a...
Does header length affect performance in optical burst switched networks? (2004)
Vazquez-Abad, Felisa J., White, Jolyon A., Andrew, Lachlan L. H., Tucker, Rodney S.
We investigate the effect of nonnegligible header length (HL) in optical burst switching on blocking probability. The HL is the total delay of a control packet at the controller. We first develop a...
Fast simulation of wavelength continuous WDM networks (2004)
This paper considers the estimation of blocking probabilities of circuit-switched WDM networks with no wavelength converters and with fixed routing. It presents an importance sampling simulation...
FULL-RCMA: a high utilization EPON (2004)
Foh, Chuan Heng, Andrew, Lachlan L. H., Wong, Elaine, Zukerman, Moshe
This paper proposes an alternate solution for Ethernet passive optical networks. Our solution uses a novel protocol named full utilization local loop request contention multiple-access protocol to...
On routing in CDMA multihop cellular networks (2004)
Andrew, Lachlan L. H., Hanly, Stephen V.
In ad-hoc networks, the optimal hop size is a trade-off between the transmission errors and the number of hops required. This paper investigates the optimal hop size and transmission strategy in...
MaxNet: faster flow control convergence (2004)
Wydrowski, Bartek P., Andrew, Lachlan L. H., Mareels, Iven M. Y.
MaxNet is a distributed congestion control architecture in which only the most severely bottlenecked link on the end-to-end path controls the source rate. This paper shows that the small-signal...
Efficient internet traffic delivery over wireless networks (2003)
Mukhtar, Rami G., Hanly, Stephen V., Andrew, Lachlan L. H.
The high demand for wireless Internet connectivity has driven the development of highly efficient radio link technologies. However, their performance can be compromised by inadvertent interactions...
CLAMP: a system to enhance the performance of wireless access networks (2003)
Andrew, Lachlan L. H., Hanly, Stephen V., Mukhtar, Rami G.
This paper presents an improved version of CLAMP, a system that controls the behavior of TCP to enhance the performance of wireless access points. It only requires modifications to be made to the...
An asymptotically optimal greedy algorithm for large optical burst switching systems (2003)
Andrew, Lachlan L. H., Baryshnikov, Yuliy, Coffman Jr, E. G., Hanly, Stephen V., White, Jolyon
As the number of wavelengths in OBS systems increases, the utilization achievable for a given blocking probability can be made to approach 100%. This paper shows that this property applies to a...
MaxNet: a congestion control architecture for scalable networks (2003)
Wydrowski, Bartek, Andrew, Lachlan L. H., Zukerman, Moshe
MaxNet is a distributed congestion control architecture. This paper analyzes the stability properties of MaxNet. We show that MaxNet is stable for networks with arbitrary delays, numbers of sources,...
CLAMP: differentiated capacity allocation in access networks (2003)
Andrew, Lachlan L. H., Hanly, Stephen V., Mukhtar, Rami G.
This paper presents a solution for providing differentiated capacity allocation in an access network. The system is based on CLAMP, an algorithm that can differentiate between flows sharing the same...
Fast simulation of linear communication systems via conditional Monte Carlo analysis (2003)
Andrew, Lachlan L. H., Manton, Jonathan H., Pham, Duong H.
This paper presents a new technique for the fast simulation of the bit error rate and other statistical performance measures of communication systems. Whereas traditional fast simulation techniques...
FULL-RCMA: a high utilization EPON (2003)
Foh, Chuan Heng, Zukerman, Moshe, Andrew, Lachlan L. H., Wong, Elaine
This paper proposes a novel medium access control protocol for Ethernet passive optical networks. Its efficiency is evaluated by simulations that demonstrate that 95% utilization can be achieved...
Performance of networks containing both MaxNet and SumNet links (2003)
Andrew, Lachlan L. H., Wydrowski, Bartek P.
Both MaxNet and SumNet are distributed congestion control architectures suitable for the Internet. MaxNet has recently been shown to have better fairness and scaling properties, but the majority of...
Fast simulation of linear communication systems via conditional Monte Carlo analysis (2003)
Andrew, Lachlan L. H., Manton, Jonathan H., Pham, Duong H.
This paper presents a new technique for the fast simulation of the bit error rate and other statistical performance measures of communication systems. Whereas traditional fast simulation techniques...
FULL-RCMA: a high utilization EPON (2003)
Foh, Chuan Heng, Zukerman, Moshe, Andrew, Lachlan L. H., Wong, Elaine
This paper proposes a novel medium access control protocol for Ethernet passive optical networks. Its efficiency is evaluated by simulations that demonstrate that 95% utilization can be achieved...
Efficient internet traffic delivery over wireless networks (2003)
Mukhtar, Rami G., Hanly, Stephen V., Andrew, Lachlan L. H.
The high demand for wireless Internet connectivity has driven the development of highly efficient radio link technologies. However, their performance can be compromised by inadvertent interactions...
Performance of networks containing both MaxNet and SumNet links (2003)
Andrew, Lachlan L. H., Wydrowski, Bartek P.
Both MaxNet and SumNet are distributed congestion control architectures suitable for the Internet. MaxNet has recently been shown to have better fairness and scaling properties, but the majority of...
CLAMP: a system to enhance the performance of wireless access networks (2003)
Andrew, Lachlan L. H., Hanly, Stephen V., Mukhtar, Rami G.
This paper presents an improved version of CLAMP, a system that controls the behavior of TCP to enhance the performance of wireless access points. It only requires modifications to be made to the...
An asymptotically optimal greedy algorithm for large optical burst switching systems (2003)
Andrew, Lachlan L. H., Baryshnikov, Yuliy, Coffman Jr, E. G., Hanly, Stephen V., White, Jolyon
As the number of wavelengths in OBS systems increases, the utilization achievable for a given blocking probability can be made to approach 100%. This paper shows that this property applies to a...
MaxNet: a congestion control architecture for scalable networks (2003)
Wydrowski, Bartek, Andrew, Lachlan L. H., Zukerman, Moshe
MaxNet is a distributed congestion control architecture. This paper analyzes the stability properties of MaxNet. We show that MaxNet is stable for networks with arbitrary delays, numbers of sources,...
CLAMP: differentiated capacity allocation in access networks (2003)
Andrew, Lachlan L. H., Hanly, Stephen V., Mukhtar, Rami G.
This paper presents a solution for providing differentiated capacity allocation in an access network. The system is based on CLAMP, an algorithm that can differentiate between flows sharing the same...
Estimation of blocking probabilities in cellular networks with dynamic channel assignment (2002)
Vazquez-Abad, Felisa J., Andrew, Lachlan L. H., Everitt, David
Blocking probabilities in cellular mobile communication networks using dynamic channel assignment are hard to compute for realistic sized systems. This computational difficulty is due to the...
Minimum power routing for multihop cellular networks (2002)
In multihop cellular networks, mobiles with no good path to any base station may instead relay their calls through other mobiles with better propagation conditions. This can improve coverage and...
Filtered Gibbs sampler for estimating blocking in product form networks (2002)
Andrew, Lachlan L. H., Vazquez-Abad, Felisa J.
The filtered Gibbs sampler (FGS) is a very simple yet efficient method of performance evaluation for a class of communication networks. This paper confirms that the FGS is considerably more efficient...
Analysis of a flow control scheme for rate adjustment by managing inflows (2002)
Andrew, Lachlan L. H., Hanly, Stephen V., Mukhtar, Rami G.
In this paper we study the stability of a recently proposed flow control algorithm for fair bandwidth sharing of a bottleneck access link. We present necessary conditions of stability for an...
Wavelength-continuous WDM networks with non-uniform service rates (2002)
Many circuit switched networks have stationary state probabilities which depend on the arrival and service rates only through their ratio. This paper shows that this is not the case for WDM networks...
Filtered Gibbs sampler for estimating blocking in product form networks (2002)
Andrew, Lachlan L. H., Vazquez-Abad, Felisa J.
The filtered Gibbs sampler (FGS) is a very simple yet efficient method of performance evaluation for a class of communication networks. This paper confirms that the FGS is considerably more efficient...
Analysis of a flow control scheme for rate adjustment by managing inflows (2002)
Andrew, Lachlan L. H., Hanly, Stephen V., Mukhtar, Rami G.
In this paper we study the stability of a recently proposed flow control algorithm for fair bandwidth sharing of a bottleneck access link. We present necessary conditions of stability for an...
Wavelength-continuous WDM networks with non-uniform service rates (2002)
Many circuit switched networks have stationary state probabilities which depend on the arrival and service rates only through their ratio. This paper shows that this is not the case for WDM networks...
Estimation of blocking probabilities in cellular networks with dynamic channel assignment (2002)
Vazquez-Abad, Felisa J., Andrew, Lachlan L. H., Everitt, David
Blocking probabilities in cellular mobile communication networks using dynamic channel assignment are hard to compute for realistic sized systems. This computational difficulty is due to the...
Minimum power routing for multihop cellular networks (2002)
In multihop cellular networks, mobiles with no good path to any base station may instead relay their calls through other mobiles with better propagation conditions. This can improve coverage and...
Power-control-based band allocation in multiband CDMA (2001)
Shrader, Brooke E., Karlsson, Robert S., Andrew, Lachlan L. H., Zander, Jens
Multiband CDMA is useful for constructing DSCDMA (CDMA) systems over a non-contiguous spectrum. The method by which users are assigned to their respective frequency bands, termed 'band allocation',...
Scheduling disciplines for multimedia WLANs: embedded round robin and wireless dual queue (2001)
Ranasinghe, Ravindra S., Andrew, Lachlan L. H., Hayes, David A., Everitt, David
Wireless local area networks have developed into a promising solution to support advanced data services in untethered environments. Selection of an efficient packet-scheduling scheme is important for...
Optimising the polling sequence in embedded round robin WLANs (2001)
Andrew, Lachlan L. H., Ranasinghe, Ravindra S.
Transmitting variable-bit-rate real-time data on the uplink of a polled wireless local area network requires careful scheduling to achieve satisfactory performance and capacity. This is a 'blind'...
Optimising the polling sequence in embedded round robin WLANs (2001)
Andrew, Lachlan L. H., Ranasinghe, Ravindra S.
Transmitting variable-bit-rate real-time data on the uplink of a polled wireless local area network requires careful scheduling to achieve satisfactory performance and capacity. This is a 'blind'...
Scheduling disciplines for multimedia WLANs: embedded round robin and wireless dual queue (2001)
Ranasinghe, Ravindra S., Andrew, Lachlan L. H., Hayes, David A., Everitt, David
Wireless local area networks have developed into a promising solution to support advanced data services in untethered environments. Selection of an efficient packet-scheduling scheme is important for...
Power-control-based band allocation in multiband CDMA (2001)
Shrader, Brooke E., Karlsson, Robert S., Andrew, Lachlan L. H., Zander, Jens
Multiband CDMA is useful for constructing DSCDMA (CDMA) systems over a non-contiguous spectrum. The method by which users are assigned to their respective frequency bands, termed 'band allocation',...
Filtered Gibbs sampler for estimating blocking probabilities in WDM optical networks (2000)
Vazquez-Abad, Felisa J., Andrew, Lachlan L. H.
Blocking probabilities in Wavelength Division Multiplex optical networks are hard to compute for realistic sized systems, even though analytical formulas for the distribution exist (under maximal...
Filtered Gibbs sampler for estimating blocking probabilities in WDM optical networks (2000)
Vazquez-Abad, Felisa J., Andrew, Lachlan L. H.
Blocking probabilities in Wavelength Division Multiplex optical networks are hard to compute for realistic sized systems, even though analytical formulas for the distribution exist (under maximal...
Load balancing in multiband CDMA (1999)
Multiband (or multi-carrier) CDMA is a promising approach to increasing the capacity of CDMA systems. The MBA algorithm was recently proposed for allocating new calls to bands based on measured path...
Hayes, David A., Rumsewicz, Michael, Andrew, Lachlan L. H.
In this paper we focus on real-time scheduling of `soft' real-time data services such as multimedia data, MPEG video streaming and IP telephony, which can tolerate a small degree of loss or delay. We...
Measurement-based band allocation in multiband CDMA (1999)
Multiband (or multi-carrier) CDMA is a promising approach to increasing the capacity of CDMA systems, while maintaining compatibility with existing systems. This paper proposes an algorithm for...
Performance of a global congestion measure for CDMA networks (1999)
Andrew, Lachlan L. H., Hanly, Stephen V.
A recently proposed global congestion measure for CDMA networks is applied to call admission control, call dropping, and band allocation in multi-carrier CDMA networks. It is shown to perform...
Queueing model for soft-blocking CDMA systems (1999)
Andrew, Lachlan L. H., Payne, Donald J. B., Hanly, Stephen V.
A new model is proposed for the analysis of CDMA systems. This model is a birth and death process whose birth process considers the new call arrival rate, the blocking rate, the effect of soft...
Impact of flow control on quality of service driven packet scheduling disciplines (1999)
Hayes, David A., Rumsewicz, Michael, Andrew, Lachlan L. H.
In this paper we investigate the interaction between window based flow control and a recently proposed packet scheduling discipline designed for real-time services. The scheduling discipline, called...
Distributed contention-free traffic scheduling in IEEE 802.11 multimedia networks (1999)
Ranasinghe, Ravindra S., Andrew, Lachlan L. H., Everitt, David
Wireless local area networks are a promising solution to support advanced data services in mobile environments. The IEEE 802.11 wireless LAN standard is emerging as a mature technology to support...
Impact of polling strategy on capacity of 802.11 based wireless multimedia LANs (1999)
Ranasinghe, Ravindra S., Andrew, Lachlan L. H., Everitt, David
Wireless local area networks are a viable technology to support multimedia traffic. One of the prominent wireless local area network standards being adopted as a mature technology is the IEEE 802.11...
Fair queueing scheduler for IEEE 802.11 based wireless multimedia networks (1999)
Ranasinghe, Ravindra S., Everitt, David, Andrew, Lachlan L. H.
Wireless local area networks are a viable technology to support multimedia traffic. One of the prominent wireless local area network standards is the IEEE 802.11 standard. In wireless multimedia...
Impact of polling strategy on capacity of 802.11 based wireless multimedia LANs (1999)
Ranasinghe, Ravindra S., Andrew, Lachlan L. H., Everitt, David
Wireless local area networks are a viable technology to support multimedia traffic. One of the prominent wireless local area network standards being adopted as a mature technology is the IEEE 802.11...
Performance of a global congestion measure for CDMA networks (1999)
Andrew, Lachlan L. H., Hanly, Stephen V.
A recently proposed global congestion measure for CDMA networks is applied to call admission control, call dropping, and band allocation in multi-carrier CDMA networks. It is shown to perform...
Fair queueing scheduler for IEEE 802.11 based wireless multimedia networks (1999)
Ranasinghe, Ravindra S., Everitt, David, Andrew, Lachlan L. H.
Wireless local area networks are a viable technology to support multimedia traffic. One of the prominent wireless local area network standards is the IEEE 802.11 standard. In wireless multimedia...
Load balancing in multiband CDMA (1999)
Multiband (or multi-carrier) CDMA is a promising approach to increasing the capacity of CDMA systems. The MBA algorithm was recently proposed for allocating new calls to bands based on measured path...
Hayes, David A., Rumsewicz, Michael, Andrew, Lachlan L. H.
In this paper we focus on real-time scheduling of `soft' real-time data services such as multimedia data, MPEG video streaming and IP telephony, which can tolerate a small degree of loss or delay. We...
Queueing model for soft-blocking CDMA systems (1999)
Andrew, Lachlan L. H., Payne, Donald J. B., Hanly, Stephen V.
A new model is proposed for the analysis of CDMA systems. This model is a birth and death process whose birth process considers the new call arrival rate, the blocking rate, the effect of soft...
Impact of flow control on quality of service driven packet scheduling disciplines (1999)
Hayes, David A., Rumsewicz, Michael, Andrew, Lachlan L. H.
In this paper we investigate the interaction between window based flow control and a recently proposed packet scheduling discipline designed for real-time services. The scheduling discipline, called...
Distributed contention-free traffic scheduling in IEEE 802.11 multimedia networks (1999)
Ranasinghe, Ravindra S., Andrew, Lachlan L. H., Everitt, David
Wireless local area networks are a promising solution to support advanced data services in mobile environments. The IEEE 802.11 wireless LAN standard is emerging as a mature technology to support...
Measurement-based band allocation in multiband CDMA (1999)
Multiband (or multi-carrier) CDMA is a promising approach to increasing the capacity of CDMA systems, while maintaining compatibility with existing systems. This paper proposes an algorithm for...
Generalised analysis of a QoS-aware routing algorithm (1998)
Modern communications services have strict quality of service (QoS) requirements, with separate constraints on bandwidth, delay and error tolerance. The task of finding a route through a network...
Design of a medium access control protocol for a WDMA/TDMA photonic ring network (1998)
Fransson, J., Johansson, M., Roughan, Matthew, Andrew, Lachlan L. H., Summerfield, Mark A.
We present a new medium access control protocol for a photonic ring network based on a combination of wavelength- and time-division multiple access. The protocol can achieve a maximum throughput in...
Performance of fuzzy logic ABR rate control with large round trip times (1998)
Su-Hsien, Kuan, Andrew, Lachlan L. H.
For ABR to be practical, its rate must be able to be controlled effectively even in the presence of a large round trip time (RTT). This paper compares the performance of a previously proposed fuzzy...
Performance of a medium access control protocol for a WDMA/TDMA photonic ring network (1998)
Fransson, J., Johansson, M., Roughan, Matthew, Andrew, Lachlan L. H., Summerfield, Mark A.
We present the results of computer simulation of a new medium access control (MAC) protocol for a photonic ring network based on a combination of wavelength- and time-division multiple access...
Dual queue approach to improving network performance during transient congestion episodes (1998)
Hayes, David A., Andrew, Lachlan L. H., Rumsewicz, Michael
Abstract not available.
Improving the robustness of fuzzy logic ATM ABR rate control for large round trip times (1998)
Andrew, Lachlan L. H., Kuan, Su-Hsien
For ABR to be a practical part of ATM, its rate must be able to be controlled effectively even in the presence of a large round trip time (RTT). A simple fuzzy logic controller was recently shown to...
Performance of a medium access control protocol for a WDMA/TDMA photonic ring network (1998)
Fransson, J., Johansson, M., Roughan, Matthew, Andrew, Lachlan L. H., Summerfield, Mark A.
We present the results of computer simulation of a new medium access control (MAC) protocol for a photonic ring network based on a combination of wavelength- and time-division multiple access...
Dual queue approach to improving network performance during transient congestion episodes (1998)
Hayes, David A., Andrew, Lachlan L. H., Rumsewicz, Michael
Abstract not available.
Improving the robustness of fuzzy logic ATM ABR rate control for large round trip times (1998)
Andrew, Lachlan L. H., Kuan, Su-Hsien
For ABR to be a practical part of ATM, its rate must be able to be controlled effectively even in the presence of a large round trip time (RTT). A simple fuzzy logic controller was recently shown to...
Generalised analysis of a QoS-aware routing algorithm (1998)
Modern communications services have strict quality of service (QoS) requirements, with separate constraints on bandwidth, delay and error tolerance. The task of finding a route through a network...
Design of a medium access control protocol for a WDMA/TDMA photonic ring network (1998)
Fransson, J., Johansson, M., Roughan, Matthew, Andrew, Lachlan L. H., Summerfield, Mark A.
We present a new medium access control protocol for a photonic ring network based on a combination of wavelength- and time-division multiple access. The protocol can achieve a maximum throughput in...
Performance of fuzzy logic ABR rate control with large round trip times (1998)
Su-Hsien, Kuan, Andrew, Lachlan L. H.
For ABR to be practical, its rate must be able to be controlled effectively even in the presence of a large round trip time (RTT). This paper compares the performance of a previously proposed fuzzy...
Binary output of cellular neural networks with smooth activation (1997)
An important property of cellular neural networks (CNNs) is the binary output property, that, when the self-feedback is greater than one, the final activations are ۫ 1. This brief considers the...
On binary output of cellular neural networks (1997)
A weakness in the standard proofs of the binary output property in cellular neural network theory is pointed out. A more rigorous proof based on the eigenvalues of the system matrix is provided.
Redundancy in quantisers for noisy channels (1997)
This paper presents a study of the nature of optimal quantizer/dequantizer pairs for use with binary symmetric channels with moderate to high error rates. It is well known that some codewords of such...
Subband prediction by edge reconstruction (1997)
In subband coding, much of the information in the high frequency subbands can be derived from either the lower frequency subbands or the other high frequency subbands. This paper presents a technique...
Optimal reconstruction from a fixed quantiser over a noisy channel (1997)
This paper investigates the optimal quantisation decoder to use for a range of channel conditions when the encoder is unaware of the channel error rate. Closed form expressions are derived for the...
Subband prediction by edge reconstruction (1997)
In subband coding, much of the information in the high frequency subbands can be derived from either the lower frequency subbands or the other high frequency subbands. This paper presents a technique...
Optimal reconstruction from a fixed quantiser over a noisy channel (1997)
This paper investigates the optimal quantisation decoder to use for a range of channel conditions when the encoder is unaware of the channel error rate. Closed form expressions are derived for the...
Binary output of cellular neural networks with smooth activation (1997)
An important property of cellular neural networks (CNNs) is the binary output property, that, when the self-feedback is greater than one, the final activations are ۫ 1. This brief considers the...
Redundancy in quantisers for noisy channels (1997)
This paper presents a study of the nature of optimal quantizer/dequantizer pairs for use with binary symmetric channels with moderate to high error rates. It is well known that some codewords of such...
On binary output of cellular neural networks (1997)
A weakness in the standard proofs of the binary output property in cellular neural network theory is pointed out. A more rigorous proof based on the eigenvalues of the system matrix is provided.
Image coding using vector quantisation with neural networks (1996)
Includes bibliographical references.
Improving the robustness of winner-take-all cellular neural networks (1996)
This paper describes two improvements on a recently proposed winner-take-all (WTA) architecture with linear circuit complexity based on the cellular neural network paradigm. The general design...
Comments on 'On a novel unsupervised competitive learning algorithm for scalar quantization' (1996)
A recent letter presented a novel neural-network learning rule, BAR, (boundary adaptation rule) which was shown to converge to a scalar quantizer with equiprobable outputs. Such quantizers will be...
A unified approach to selecting optimal step lengths for adaptive vector quantizers (1996)
Andrew, Lachlan L. H., Palaniswami, Marimuthu
This paper presents expressions for the optimal step length to use when training a vector quantizer by stochastic approximation. By treating each update as an estimation problem it provides a unified...
Neural networks for image coding: a review (1996)
Andrew, Lachlan L. H., Palaniswami, Marimuthu
Images are forming an increasingly large part of modern communications, bringing the need for efficient and effective compression. This survey aims to give the reader a feel for the wide range of...
Neural networks for adaptive image sequence vector quantisation (1996)
This paper studies some properties of a recently proposed adaptive VQ scheme based on a neural network approach. The scheme is distinctive in that it does not require a separate channel to transmit...
Comments on 'On a novel unsupervised competitive learning algorithm for scalar quantization' (1996)
A recent letter presented a novel neural-network learning rule, BAR, (boundary adaptation rule) which was shown to converge to a scalar quantizer with equiprobable outputs. Such quantizers will be...
Neural networks for image coding: a review (1996)
Andrew, Lachlan L. H., Palaniswami, Marimuthu
Images are forming an increasingly large part of modern communications, bringing the need for efficient and effective compression. This survey aims to give the reader a feel for the wide range of...
Neural networks for adaptive image sequence vector quantisation (1996)
This paper studies some properties of a recently proposed adaptive VQ scheme based on a neural network approach. The scheme is distinctive in that it does not require a separate channel to transmit...
Improving the robustness of winner-take-all cellular neural networks (1996)
This paper describes two improvements on a recently proposed winner-take-all (WTA) architecture with linear circuit complexity based on the cellular neural network paradigm. The general design...
A unified approach to selecting optimal step lengths for adaptive vector quantizers (1996)
Andrew, Lachlan L. H., Palaniswami, Marimuthu
This paper presents expressions for the optimal step length to use when training a vector quantizer by stochastic approximation. By treating each update as an estimation problem it provides a unified...
New adaptive image sequence coding scheme using Kohonen's SOFM (1995)
Andrew, Lachlan L. H., Palaniswami, Marimuthu
This paper presents a novel adaptive vector quantization scheme based on the SOFM neural network. All adaptation is performed directly from the quantized image with no explicit adaptation information...
New adaptive image sequence coding scheme using Kohonen's SOFM (1995)
Andrew, Lachlan L. H., Palaniswami, Marimuthu
This paper presents a novel adaptive vector quantization scheme based on the SOFM neural network. All adaptation is performed directly from the quantized image with no explicit adaptation information...
Neuron splitting for efficient feature map formation (1994)
Kohonen's Self Organizing Feature Map (SOFM) produces an ordered mapping from one space to another. This paper describes an algorithm inspired by the splitting initialization for the classical LBG...
A study on the effect of neighbourhood functions for noise robust vector quantisers (1994)
Andrew, Lachlan L. H., Palaniswami, Marimuthu
By the use of noise robust compression, separate error correction can be reduced. This paper studies a number of neighbourhood functions for the SOFM for designing image vector quantiser codebooks...
Neuron splitting for efficient feature map formation (1994)
Kohonen's Self Organizing Feature Map (SOFM) produces an ordered mapping from one space to another. This paper describes an algorithm inspired by the splitting initialization for the classical LBG...
A study on the effect of neighbourhood functions for noise robust vector quantisers (1994)
Andrew, Lachlan L. H., Palaniswami, Marimuthu
By the use of noise robust compression, separate error correction can be reduced. This paper studies a number of neighbourhood functions for the SOFM for designing image vector quantiser codebooks...