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首页> 外文期刊>Wireless Communications Letters, IEEE >Flexible-Rate SIC-Free NOMA for Downlink VLC Based on Constellation Partitioning Coding
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Flexible-Rate SIC-Free NOMA for Downlink VLC Based on Constellation Partitioning Coding

机译:基于星座分区编码的下行链路VLC灵活率SIC NOMA

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摘要

Visible light communication (VLC) systems utilizing conventional superposition coding/successive interference cancellation (SPC/SIC)-based non-orthogonal multiple access (NOMA) suffer from the error propagation effect due to imperfect SIC. In this letter, we propose a flexible-rate SIC-free NOMA technique for downlink VLC systems, based on constellation partitioning coding (CPC) and uneven constellation demapping (UCD). By using CPC/UCD, SIC is not required and hence error propagation can be eliminated in NOMA-based VLC systems. Moreover, by selecting a proper bit allocation scheme, flexible-rate multiple access can be supported in the VIC system applying CPC/UCD-based NOMA. Proof-of-concept two-user VLC experiments verify that, compared with conventional SPC/SIC-based NOMA, the bit error rate performance of the near user can be greatly improved by using CPC/UCD-based NOMA, and hence the effective power allocation ratio range can be substantially extended.
机译:利用传统的叠加编码/连续干扰消除(SPC / SIC)的可见光通信(VLC)系统基于非正交多访问(NOMA)由于不完美的SIC而遭受误差传播效果。在这封信中,我们提出了一种基于星座分区编码(CPC)和不均匀星座解映射(UCD)的下行链路VLC系统的灵活率SIC的NOMA技术。通过使用CPC / UCD,不需要SiC,因此可以在基于NOMA的VLC系统中消除错误传播。此外,通过选择适当的比特分配方案,可以在应用CPC / UCD的NOMA的VIC系统中支持灵活速率多访问。概念证明两用户VLC实验验证,与传统的SPC / SIC的NOMA相比,通过使用基于CPC / UCD的NOMA可以大大提高近用户的误码率性能,从而实现有效功率分配比率范围可以基本上延伸。

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