Multiresolution signal decomposition: transforms, subands, and wavelets
Multiresolution signal decomposition: transforms, subands, and wavelets
Multi-Carrier and Spread Spectrum Systems
Multi-Carrier and Spread Spectrum Systems
Properties of the Multidimensional Generalized Discrete Fourier Transform
IEEE Transactions on Computers
Generalized discrete Fourier transform: theory and design methods
SARNOFF'09 Proceedings of the 32nd international conference on Sarnoff symposium
Walsh-Like Nonlinear Phase Orthogonal Codes for Direct Sequence CDMA Communications
IEEE Transactions on Signal Processing - Part II
Accurate DS-CDMA bit-error probability calculation in Rayleigh fading
IEEE Transactions on Wireless Communications
Optimal binary sequences for spread spectrum multiplexing (Corresp.)
IEEE Transactions on Information Theory
Polyphase codes with good periodic correlation properties (Corresp.)
IEEE Transactions on Information Theory
Lower bounds on the maximum cross correlation of signals (Corresp.)
IEEE Transactions on Information Theory
Bounds on crosscorrelation and autocorrelation of sequences (Corresp.)
IEEE Transactions on Information Theory
The merit factor of long low autocorrelation binary sequences (Corresp.)
IEEE Transactions on Information Theory
Polyphase codes with good nonperiodic correlation properties
IEEE Transactions on Information Theory
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Recently, a theoretical framework for Generalized DFT (GDFT) with nonlinear phase functions exploiting the phase space to design various constant modulus orthogonal transforms was introduced. This paper extends prior work to design longer bases widely used in real world communications systems. GDFT provides flexibilities in phase space yielding performance improvements over other code families including DFT in correlation metrics. GDFT phase functions are optimally designed in order to reduce inter carrier interference (ICI) and inter-symbol interference (ISI) that dictate the performance of a multiuser channel. It is presented in the paper that superior correlation of GDFT over DFT manifests itself in improved BER performance in direct sequence CDMA based multi-user communications systems