BER improvement of DS-CDMA for AWGN and Rayleigh fading channel with Kasami code

In this paper we represent the work to improve the quality or reducing the effective BER in a multipath fading channel. BER is inversely proportional to SNR so high SNR results in low BER and vice versa. The study of this paper is to have focus on the performance of digital communication system. For reliable communication system, its BER should be as low as possible i.e. improvement in BER. BER performance of Kasami code for AWGN channel is studied and result is given for comparison of DPSK and BPSK modulation. The simulation is carried out with MATLAB. BER improvement of DS-CDMA system for different codes using baseband modulations for AWGN is discussed.