Ber performance analysis of a MC-DS-CDMA wireless communication system with rake receiver employing MRC under Nakagami-M fading

Abstract

Multicarrier code-division multiple access is a promising spread spectrum transmission technique where each input data stream is partitioned into parallel sub streams that are modulated at different subcarriers. In MC CDMA use of orthogonal subcarriers by OFDM technique provides higher data rate which leads to improve bandwidth efficiency. In this thesis a nobel theoretical analysis is presented for a MC-DS-CDMA wireless communication system with OFDM subcarriers with Rake receivers under Nakagami-m fading environment considering maximal ratio combining (MRC) for the rake combiner. To achieve receive diversity multiple receiving antennas are used in this system. The expression for the probability density function (pdf) of the signal to noise ratio at the output of rake combiner is developed for individual sub-channels of the OFDM sub carriers. BER is then determined for each individual OFDM sub-channels and the average BER is then evaluated numerically. The results show that the BER performance improves significantly with the increase in the number of rake fingers, number of receiving antennas, processing gain etc.