| Fang Weiwei (方伟伟),Li Jianping,Cai Chaoshi.[J].高技术通讯(英文),2013,19(1):70~75 |
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| A novel mapping scheme and modified decoding algorithm for BICM-ID |
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| DOI： |
| 中文关键词: |
| 英文关键词: bit-interleaved coded modulation with iterative decoding (BICM-ID), minimum squared Euclidean distance (MSED), average power, cross equalization-8PSK-quasi-semi set partitioning (CE-8PSK-Quasi-SSP), extrinsic information, priori information, weighted coefficient |
| 基金项目: |
| Author Name | Affiliation | | Fang Weiwei (方伟伟) | | | Li Jianping | | | Cai Chaoshi | |
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| 中文摘要: |
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| 英文摘要: |
| This paper proposes a novel mapping scheme for bit-interleaved coded modulation with iterative decoding (BICM-ID). The symbol mapping is composed of two QPSK with different radiuses and phases, called cross equalization-8PSK-quasi-semi set partitioning (CE-8PSK-Quasi-SSP). Providing the same average power, the proposed scheme can increase the minimum squared Euclidean distance (MSED) and then improve the receiving performance of BICM-ID compared with conventional symbol mapping schemes. Simultaneously, a modified iteration decoding algorithm is proposed in this paper. In the process of iteration decoding, different proportion of the extrinsic information to the systematic observations results in distinct decoding performance. At high SNR (4~9dB), the observation information plays a more important role than the extrinsic information. Simulation results show that the proportion set at 1.2 is more suitable for the novel mapping in BICM-ID. When the BER is 10-4, more than 0.9dB coding gain over Rayleigh channels can be achieved for the improved mapping and decoding scheme. |
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