Performance evaluation of MIMO-OFDM systems using MRC and EGT for wireless channels

Abstract

The advances in the communication field results in need for higher data rates in addition to both increase in power efficiency and lower bit error rate (BER). Multiple input multiple output-Orthogonal frequency division multiplexing (MIMO-OFDM) is extensively used in current and next generation broadband wireless communications to yield a high data rate of transmission and spectral efficiency over the multipath fading channels. The MIMO-OFDM systems has a major drawback as is it suffers from high peak-to-average power ratio (PAPR) which in turn requires designing of efficient power amplifier (PA), in order to maintain a wider linear region for preventing signal clipping, which therefore increases hardware complexity and power consumption. The various PAPR reduction algorithms have been developed which provide a maximum PAPR reduction ranging from 0.5 to 6 dB. The maximum SNR loss after applying a Beamforming technique is reported around 0.2 dB with BER of around 10−4 to 10−6. In the current work. Performance of PAPR analysis and reduction algorithms for beam-forming techniques include Maximum Ratio Transmission (MRT), Equal Gain Transmission (EGT) and receive combining techniques Maximum Ratio Combining (MRC), Equal Gain Combining (EGC) for MIMO-OFDM system is evaluated and reported. Measurement of MIMO-OFDM is done in terms of BER, PAPR reduction, Signal to Noise ratio (SNR) with two major PAPR reduction scheme Selective Level Mapping (SLM) and Partial Transmit Sequence (PTS).