Evaluating Viterbi decoded Reed-Solomon block codes on a complex spreaded DS/SSMA CDMA system. Part I: background and communication system models

摘要

In recent years, the Viterbi algorithm (VA) has been shown to be an efficient trellis decoder for binary and non-binary linear blocks. In our simulation study, the performance of VA decoded non-binary Reed-Solomon (RS) block codes, employed in a wideband code division multiple access (CDMA) system, operating in multipath fading channel conditions, was considered. A RAKE receiver-based direct sequence spread spectrum multiple access (DS/SSMA) quadrature phase shift keying (QPSK) system is employed. It uses complex spreading sequence (CSS), such as Frank-Zadoff-Chu (FZC), double sideband (DSB) constant envelope linearly interpolated root-of-unity (CE-LI-RU) filtered general chirp-like (GCL), analytical bandlimited complex (ABC) and quadriphase (QPH) sequences. The paper first describes the VA decoding of linear block codes. Next, background information is given on the filtered and unfiltered CSS families employed in the simulation study. Lastly, the RAKE receiver-based DS/SSMA QPSK communication system simulation models are presented.