Precoded MIMO Systems With Nonbinary LDPC Codes and Many-to-One Mapping
Precoded MIMO Systems With Nonbinary LDPC Codes and Many-to-One Mapping
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DOI：
10.1109/tvt.2017.2778005
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发表时间：
2018-04
影响因子：
6.8
通讯作者：
Nhat-Quang Nhan;P. Rostaing;K. Amis;E. Radoi;Y. R. Zheng
中科院分区：
文献类型：
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作者：
Nhat-Quang Nhan;P. Rostaing;K. Amis;E. Radoi;Y. R. Zheng
针对多输入多输出（MIMO）系统，提出了一种基于非二进制低密度奇偶校验（NB-LDPC）码和多对一映射的预编码设计方法。当使用高阶调制方案时，多对一映射将一组低阶伽罗瓦域（GF）编码的符号转换为一个调制的MIMO符号向量。相反，一对一映射直接从一个高阶GF编码符号映射高阶调制符号。在NB-LDPC编码器和GF到MIMO符号映射器之间的交织器的帮助下，多对一映射实现了Turbo接收机，并将计算复杂度降低了95%以上。所提出的MIMO预编码器增强了多对一NB-LDPC MIMO系统的误码率性能，特别是在降低错误平层和改善瀑布区域方面。所提出的预编码器设计修改了次优最大化接收到的MIMO符号之间的最小欧几里得距离的方法。仿真结果表明，所提出的预编码器增强了预编码器设计的鲁棒性，减少了Turbo接收机的内外迭代次数。
A precoding design is proposed for multiple-input multiple-output (MIMO) systems utilizing nonbinary low-density parity check (NB-LDPC) codes and many-to-one mapping. When a high-order modulation scheme is used, many-to-one mapping converts a group of low-order Galois field (GF) coded symbols into one modulated MIMO symbol vector. In contrast, one-to-one mapping maps a high-order modulation symbol directly from one high-order GF coded symbol. With the help of an interleaver between the NB-LDPC encoder and the GF to MIMO symbol mapper, the many-to-one mapping enables turbo receiver and reduces the computational complexity by more than 95%. The proposed MIMO precoders enhance the error-rate performance of the many-to-one NB-LDPC MIMO system, especially in terms of reducing the error floor and improving the waterfall region. The proposed precoder design modifies the approach that suboptimally maximizes the minimal Euclidean distance between the received MIMO symbols. Simulation results show that the proposed precoders enhance the robustness of the precoder design and reduce the inner and outer iterations of the turbo receiver.