The Performance of Iterative Decoding Schemes based LDPC-BICM in MF and HF Channels

Low density parity check (LDPC) code is flexible in construction, simple in decoding, excellent performance and high spectrum efficiency. This paper introduces the LDPC codes and bit-interleaved coded modulation with iterative decoding (BICM-ID) scheme, proposed an LDPC codes as component codes in BICM-ID scheme is applied to Multi-Level Quadrature Amplitude Modulation (M-QAM) in the OFDM communication system, and given its log-likelihood ratio belief propagation (LLR-BP) decoding algorithm. Finally, according to the characteristics of the digital broadcast channel, system performance based on LDPC-BICM-ID scheme is compare with the rate compatible punctured convolutional code (RCPC) scheme over MF and HF radio broadcasting channels. Simulation results show that the proposed scheme is better than RCPC-MLC system.