Widely Linear Linearly Constrained CMA of Momentum and Dither Sign Error for CDMA Blind Multiuser Detection

Abstract

Motivated by the performance of linear minimum mean squared error (MMSE) multiuser receivers may be improved by widely linear (WL) processing, the algorithm convergence can be fastened by adding momentum, and the overall computational complexity of algorithm can be reduced by using the dither sign-error (DSE) formation, a WL DSE momentum linearly constrained constant modulus algorithm (WL-DSE-M-LCCMA) for the multi-access interferences (MAI) suppression in direct sequence code division multiple access (DS-CDMA) systems is proposed and analyzed in this paper. Simulations have confirmed that the proposed algorithm performs better in a DS-CDMA system by employing a BPSK modulation than other algorithms such as CMA, LCCMA, WL-LCCMA.