Reduction of Complexity in DS-CDMA Using PPIC

Reduction of MAI to improve system capacity without increasing computational Complexity is the motivation to do this work. The objective of this paper is to develop an efficient multiuser detection algorithms that reduce the computational complexity in DS-CDMA system. The BER performance of the multistage multiuser detection schemes using Kasami spreading sequences and MMSE detector is found to be better than that of a conventional Matched Filter detector in a single stage multiuser detection schemes but the Computational Complexity is increasing with the number of stages and the number of users. The BER performance of the multistage multiuser PIC detection scheme is found to be better than that of a single stage multiuser PPIC detection scheme but at the cost of computational complexity increasing with number of stages and users.