A New Constellation Mapping Scheme of MPSK in BICM-ID

With the rapidly development of beyond third generation mobile communication system, how to improve the spectrum efficiency becomes a key problem. Based on the analysis of the quality of iterative decoding influenced by constellation labeling, a new general mapping rules was proposed in bit interleaved coded modulation and iterative decoding. On the one hand, to improve the performance of the system at higher signal noise ratio, the new scheme was designed of maximum squared Euclidean distance between the symbols which Hamming distance is one. On the other hand, to improve the soft-output information quality of demodulator, the new scheme has better squared Euclidean distance spectrum when Hamming distances is more than one, so the performance was improved at lower signal noise ratio. Simulation results and performance analysis show that the proposed scheme can improve the performance of BICM-ID at lower SNR under AWGN and Rayleigh fading channels.