An Improved Channel Coding Scheme Based on BICM for CMMB

Cutoff rate is a sensible parameter specifies both a range of code rates and a measure of the coding complexity to achieve a desired error probability. China mobile multimedia broadcasting (CMMB) is an important part and a hotspot of the 3rd generation of mobile communication in China. As a scenario of radio communication, the research on CMMB has to be considered over the Rayleigh fading channels. Bit-interleaved coded modulation (BICM) is known as a remarkable scheme with better code diversity and cutoff rate than others over Rayleigh fading channels. In this paper, an improved channel coding scheme based on BICM is proposed to achieve better reliability than the conventional one of CMMB over Rayleigh fading channels. The simulation results show that the error correction capability of the proposed scheme outperforms the conventional one of CMMB considerably. When BER is below 10^-5, the improved channel coding scheme can achieve more than 1 dB code gain.