A nonbinary LDPC product network coding scheme with signal space diversity

A network coding scheme employing nonbinary low density parity check (LDPC) product code with signal space diversity (SSD) is proposed in this paper. The scheme is based on a multiple access relay channel with two users, one relay and one base station. Rotated modulation and component interleaving are introduced in this scheme to realize SSD so that it can enhance the bit error rate (BER) performance for the scheme. Simulation results indicate that the proposed scheme significantly outperforms the conventional binary scheme by 1.9dB in Rayleigh fading channel. Moreover, it also proves that the rotated modulation and component interleaving play an important role in improving the BER performance of the nonbinary LDPC product code.