Performance Evaluations and Comparisons of Several LDPC Coded MC-FH-CDMA Systems

In this paper, the application of regular low-density parity-check (ldpc) codes in multi-carrier frequency-hopping (mc-fh) cdma systems is studied. to this end, different well-known constructions of regular ldpc codes are considered and the performance of ldpc coded mc-fh-cdma systems, based on these constructions, are evaluated and compared in a frequency-selective slowly rayleigh fading channel. these results are compared with those previously reported for super-orthogonal convolutionally coded mc-fh-cdma systems. the simulation results indicate that the ldpc coded mc-fh-cdma system significantly outperforms the uncoded and super-orthogonal convolutionally coded schemes. to alleviate the restrictions imposed by well known ldpc construction methods when applied to the coded mc-fh-cdma system considered, a new semi-random construction is proposed and its performance is evaluated in the coded scheme. the simulation results indicate that this new construction substantially outperforms other well-known construction methods in the application considered.