Upper Bounds on Overloaded LDPC–Optimum Combinied System Over Rayleigh Fading Channel
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In this paper a closed form expression for the bit error rate of LDPC–OC system in the presence of interferers is derived over an i.i.d Rayleigh fading channel using message passing algorithm. All interferers are assumed to have equal power. The analysis is done for the case when the number of interferes is more than the number of receive antenna elements. In this paper, analytical results showed that for a BER of 10−2, the LDPC–OC system provides an additional gain of 6.3 dB over OC system alone. Both the systems provide identical diversity gain of 1.2 dB when the number of receive antennas are increased from 5 to 6.
KeywordsOptimum combining Irregular low-density parity check codes Message passing algorithm Gaussian approximation approach
This study is supported by UGC and AICTE India vide letter no 31-1(pun)/sr-2008 TU and letter number 8023/BOR/RID/RPS-105/2008-2009.
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