Spread spectrum analysis for CDMA system

Abstract

CDMA is technology for digital transmission of radio signal in telecommunication systems. In this technology, multiple users can transmit the data simultaneously in a channel using same frequency. Each user is assigned a distinguished code for transmission. There are different codes are used for this purpose. Here, PN sequence, Gold sequence and Walsh code are generated using Matlab Programming. Using Walsh code, the data was transmitted to receiver in AWGN and Fading channels. Here, transmitted data is generated randomly using matlab function. During transmission, SNR values of signal changes to calculate BER value to plot BER vs. SNR graph for both for single user and multi users in AWGN and Fading channel.