An efficient component-interleaved nonbinary Low Density Parity Check Code scheme on Rayleigh fading channels

Abstract

An efficient component-interleaved nonbinary Low Density Parity Check Code (LDPC) scheme is proposed, which can significantly outperform the binary LDPC codes scheme without a component interleaver on fading channels. In this paper, the bit-error-rate (BER) performances of nonbinary LDPC codes are compared with the binary LDPC codes on the independent Rayleigh fading channel. And then we use a fast decoding algorithm to reduce the complexity of nonbinary LDPC decoding, so that the nonbinary LDPC codes scheme becomes more practical. Besides, the influence of a component interleaver on the performance of nonbinary LDPC codes is also analyzed. Simulation results prove that nonbinary LDPC codes significantly outperform the binary LDPC codes, especially for low code rate and high order Galois field, which is up to 1.5dB. The component interleaver also can obviously improve the performance of nonbinary LDPC codes on fading channels, which is up to 0.3 dB.