A. Nallanathan

Maximum likelihood based estimation of frequency and phase offset in DCT OFDM systems under non-circular transmissions: algorithms, analysis and comparisons (2008)

Gao, Feifei, Cui, Tao, Nallanathan, A., Tellambura, C.

Recently, the advantages of the discrete cosine transform (DCT) based orthogonal frequency-division multiplexing (OFDM) have come to the light. We thus consider DCT- OFDM with non-circular...

A Class of-Channel Linear-Phase Biorthogonal Filter Banks and Their Applications to Subband Coding (2008)

S. C. Chan, A. Nallanathan, T. S. Ng

Abstract—This correspondence presents a new factorization for linearphase biorthogonal perfect reconstruction (PR) FIR filter banks. Using this factorization, we propose a new family of lapped...

Code division multiple access communication system using overlapping spread sequences (2004)

Nallanathan, A., Ng, TS, Chan, SC, Chow, S

This invention discloses a code division multiple access communications system based on spread sequences designed by using complete factorization of polyphase matrix of a perfect reconstruction (PR)...

Integer lapped transforms and their applications to image coding (2002)

Fong, WC, Chan, SC, Nallanathan, A, Ho, KL

This paper proposes new integer approximations of the lapped transforms, called the integer lapped transforms (ILT), and studies their applications to image coding. The ILT are derived from a set of...

A class of M-channel linear-phase biorthogonal filter banks and their applications to subband coding (1999)

Chan, SC, Nallanathan, A, Ng, TS, Kwok, PCK

This correspondence presents a new factorization for linear-phase biorthogonal perfect reconstruction (PR) FIR filter hanks. Using this factorization, we propose a new family of lapped transform...

A family of spread-sequences for CDMA system in a multipath fading channel (1999)

Nallanathan, A, Chan, SC, Ng, TS

A new class of orthogonal code-division multiple access (CDMA) system is developed. The key characteristic of the system is that the data symbols are spreaded by a spread-sequence that is longer than...

Lapped orthogonal transform with integer coefficients (1999)

Nallanathan, A, Chan, SC, Ng, TS

In this paper, a new 8-channel integer-valued lapped transform, called the Integer Lapped Orthogonal Transform (ILOT), is proposed. The new transform can be implemented using simple integer...

Generalized lapped transform (GLT) based high-speed transmissionfor wireless mobile communications (1998)

Nallanathan, A, Chan, SC, Ng, TS

In this paper, we describe a generalized lapped transform (GLT) based high-speed transmission technique for wireless mobile communications over Rayleigh fading channels. In this technique, the...

Performance of Generalized Lapped Transform (GLT) Based CDMA System in a Multi-Path Fading Channel (1998)

Nallanathan, A, Chan, SC, Ng, TS

We investigate the performance of a new class of spreading codes in a direct sequence spread spectrum (DSSS/CDMA) system. The spreading and despreading codes are generated from a biorthogonal filter...