Performance evaluation of LDPC coded MC-FH-CDMA systems over fading channels

In this paper, we consider the application of low-density parity-check (LDPC) codes in multi-carrier frequency-hopping (MC-FH) CDMA systems. We evaluate the performance of the coded system in a slowly Rayleigh fading frequency-selective channel using different construction methods of regular LDPC codes. We then compare the results with those of the super-orthogonal coded system. Our simulation results show that the LDPC coded scheme significantly outperforms the uncoded and the super-orthogonal coded scheme. Finally, we propose a new semi-random construction of regular LDPC code and evaluate its performance in MC-FH-CDMA system. Our numerical results indicate that this new construction outperforms other regular constructions of LDPC codes.