Interference suppression in multiuser DS-CDMA communication systems using RMGS algorithm

Authors:
Abdullah I. Hassan;D. K. Mehra
Affiliations:
Department of Electronics and Computer Engineering, University of Roorkee, Roorkee, U.P. 247667, India;Department of Electronics and Computer Engineering, University of Roorkee, Roorkee, U.P. 247667, India
Venue:
Signal Processing
Year:
2002

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Abstract

A direct sequence code division multiple access (DS-CDMA) adaptive receiver for suppressing multiple access interference (MAI), based on the minimum mean squared error (MMSE) criterion, is introduced using the recursive modified Gram-Schmidt (RMGS) algorithm. It is shown, by simulation, that the RMGS algorithm is stable unlike the RLS algorithm, while requiring similar or less number of operations as compared to RLS and QRD-LS algorithms. Parallel implementation of the RMGS algorithm using systolic arrays, which will reduce its complexity to O(N) using N-parallel processors, is also described. The performance of the RMGS algorithm has been evaluated and compared to the normalized LMS and RLS algorithms.