An improved wavelet-packet-division multiple access system

TitleAn improved wavelet-packet-division multiple access system
Publication TypeConference Paper
Year of Publication1999
AuthorsMonera-Llorca, J., W. - S. Lu, and V. K. Bhargava
Conference NameCommunications, Computers and Signal Processing, 1999 IEEE Pacific Rim Conference on
Pagination495 -498
Keywordsalgorithm, asynchronism, identification, interference, interference suppression, minimisation, minimizer, multi-access systems, numerical optimization, optimal wavelet function, quasi-Newton search algorithm, timing errors, transform coding, waveform coding, wavelet design method, wavelet function, wavelet transforms, wavelet-packet-division multiple access system, WPDMA environment

An improved wavelet-packet-division multiple access (WPDMA) system is presented. In a WPDMA environment, each message signal is waveform coded onto a wavelet function to enhance the immunity of the system against interference. We propose a wavelet design method based on numerical optimization to mitigate the effects of asynchronism in the system. In brief, the algorithm consists of two parts: (a) identification of the feasible region, and (b) use of a quasi-Newton search algorithm to find the minimizer. By employing this technique, we found the optimal wavelet function which minimizes the interference due to timing errors. The advantages of the proposed WPDMA design algorithm with respect to a previously reported procedure are discussed


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