Performance Perusal of Multiuser MC-CDMA System for Nakagami-m, Rayleigh and Rician Fading Channel with Spreading Codes

Abstract

The technique of multi-carrier code division multiple access (MC-CDMA) incorporates orthogonal frequency division multiplexing (OFDM) and code division multiple access (CDMA). In 4G systems, the Spread Spectrum technique is used, and MC-CDMA is one of those techniques. Fading channel degrades in data or signal transmission is still a research problem for an effective digital communication appliance for the mobile radio area. Spreading codes can have as low a cross-correlation value as possible to reduce co-channel and adjacent channel interference. This paper will represent the investigation of bit error rate (BER) and signal to noise ratio (SNR) analysis for multi-user MC-CDMA system using Walsh, PN, and Gold codes as spreading codes. Nakagami-m, Rayleigh, and Rician fading channels are considered transmission channels. We perform all the simulations using MATLAB tools. BER and SNR performance analysis are compared depends on the code length and number of users. The simulation result provides better performance for all the fading channels when Walsh code is used as spreading code. However, if we consider both SNR and BER, the Nakagami-m channel shows better performance than Rayleigh and Rician fading channels.