An efficient digital signal processing method for RRNS-based DS-CDMA systems

Abstract

This paper deals with an efficient method for achieving low power and high speed in advanced Direct-Sequence Code Division Multiple-Access (DS-CDMA) wireless communication systems based on the Residue Number System (RNS). A modified algorithm for multiuser DS-CDMA signal generation in MATLAB is proposed and investigated. The most important characteristics of the generated PN code are also presented. Subsequently, a DS-CDMA system based on the combination of the RNS or the so-called Redundant Residue Number System (RRNS) is proposed. The enhanced method using a spectrally efficient 8-PSK data modulation scheme to improve the bandwidth efficiency for RRNS-based DS-CDMA systems is presented. By using the C-measure (complexity measure) of the error detection function, it is possible to estimate the size of the circuit. Error detection function in RRNSs can be efficiently implemented by Look- Up Table (LUT) cascades.