Adaptive feedback equalization receiver for DS-CDMA with turbo coded systems

In this paper, adaptive equalizer receiver for a turbo code direct sequence code division multiple access (DS-CDMA) by using least mean square (LMS) adaptive algorithm is presented. The proposed adaptive equalizer is based on finite impulse response (FIR) filter structure in which included conventional adaptive equalizer, decision feedback adaptive equalizer and feedback adaptive equalizer. The objective of the proposed equalizer is to minimize the bit error rate of the data due to the disturbances of noise and intersymbol interference phenomenon on the channel of the digital communication system. The computer simulation results shown that the proposed feedback adaptive equalizer provides a good bit error rate than the others one such as conventional adaptive equalizer, decision feedback adaptive equalizer