A New Improved Symbol Mapper/8-Ary Constellation for BICM-ID

• 作者: Ali Djebbari Slimane Benmahmoud
• 来源期刊: 无线工程与技术(英文)
• 学科: 工学
• 关键词: Bit INTERLEAVED Coded Modulation BICM Iterative Decoding/Processing Log-Likelihood Ratios (LLRs) 8PSK CONSTELLATION Signal Mappings CONSTELLATION Labeling Maps EXTRINSIC Information BCJR Algorithm
• 年，卷（期）: 2013,（2）
• 页码范围: 65-70
• 页数: 6页
• 分类号: TN91

摘要

This contribution proposes a new combination symbol mapper/8-ary constellation, which is a joint optimization of an 8-ary signal constellation and its symbol mapping operation, to improve the performance of Bit Interleaved Coded Modulation with Iterative Decoding (BICM-ID). The basic idea was to use the so called (1,7) constellation (which is a capacitive efficient constellation) instead of the conventional 8-PSK constellation and to choose the most suitable mapping for it. A comparative study between the combinations most suitable mapping/(1,7) constellation and SSP mapping/conventional 8-PSK constellation has been carried out. Simulation results showed that the 1st combination significantly outperforms the 2nd combination and with only 4 iterations, it gives better performance than the 2nd combination with 8 iterations. A gain of 4 dB is given by iteration 4 of the 1st combination compared to iteration 8 of the 2nd combination at a BER level equal to 10-5, and it (iteration 4 of the 1st combination) can attain a BER equal to 10-7 for, only, a SNR = 5.6 dB.