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ANALYTICALLY COMPARISON BETWEEN LDPC- SC and LDPC-MRC USING GA APPROACH

Rekha Rani

Selection combining (SC) and maximal ratio combining (MRC) with Low Density Parity-check (LDPC) enhance the performance of overall system by providing coding gain. Using Gaussian approximation (GA) approach the bit error rate of LDPC-SC, LDPC-MRC system is derived for BPSK modulation over an independent and identically distributed (i.i.d) Rayleigh fading channel. The analysis is done for the case when the number of receiving antenna elements is varying from 3 to 6. In this paper, analytical result showed that at BER of 10-3, LDPC-SC and LDPC-MRC provide diversity gain 1.6 dB and 3 dB respectively when numbers of receiving antennas are varying from 4 to 6. So performance of LDPC-MRC is better than LDPC-SC and provides additional coding gain of 4.1dB and 1.7dB over uncoded SC and MRC systems respectively when N=6.