Adaptive Equalization for DS-CDMA Communication System Using Laguerre Filters

Abstract

In this paper an adaptive equalizer using Laguerre by providing a faster rate of convergence and insensitive transversal filter and a RLS algorithm for adaptation in DS-CDMA mobile communication system is proposed. The stability porm e vation inp t eienale prado of the Laguerre structure is compromise between the FIR and correlation matrix of the input signal [6-7]. IIR structures, since the Laguerre structure is always stable. WeIn this paper an adaptive equalizer using Laguerre also analyze the Bit Error Rate (BER) performance of the proposed equalizer and the conventional equalizer. The l l simulation results confirm that the performance of the proposed in DS-CDMA mobile communication systems is presented. system in terms of bit error rate has been improved over theThe simulation results show that the performances of the conventional equalizer, such as fast convergence and lower BER than the conventional adaptive equalizer for every Eb / No value, proposed equalizer are better than the conventional equalizer, such as fast convergence and lower BER performance of the

Adaptive Equalizer for DS-CDMA Multi-User Communication System Using Sign-Algorithm Based on Laguerre Filter Structure

“…In DS-CDMA mobile communication system with time-varying multipath channel and AWGN, both ISI and multiple access interference (MAI) are destroys the orthogonality of the channel code and limits the capacity of the system [1][2][3][4][5]. Fortunately, Chip-level adaptive equalization can be practically applied, to recover orthogonalization of the channel code and minimize the effect of MAI.…”