Blind adaptive receiver based on RLS-CMA for TH-UWB system

Abstract

A novel receiver is proposed in this paper that uses the blind adaptive multi-user detection (MUD) technique to deal with the presence of multiple-access interference (MAI) and inter-symbol interference (ISI) in terms of high speed time-hopping ultra-wideband (TH-UWB) system. The receiver firstly adopts constrained recursive least squares constant modulus algorithm (RLS-CMA) to conduct adaptive decorrelation for eliminating MAI and ISI, and then uses projection approximation subspace tracking with deflation (PASTd) algorithm to launch channel estimation, do maximal ratio combining (MRC) and improve signal to interference plus noise ratio (SINR). The simulation results show that the proposed receiver can go to convergence rapidly under all four IEEE's UWB channel models, the bit error ratio (BER) performance is better than that of the traditional receiver and rake receiver.