Polar Coded Modulation via Hybrid Bit Labeling
Polar Coded Modulation via Hybrid Bit Labeling
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DOI：
10.1109/isit50566.2022.9834804
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发表时间：
2022-02
期刊：
影响因子：
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通讯作者：
Hanwen Yao;Jinfeng Du;A. Vardy
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文献类型：
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作者：
Hanwen Yao;Jinfeng Du;A. Vardy
比特交织编码调制（BICM）和多级编码调制（MLC）通常用于将极化码与高阶调制联合收割机组合。BICM具有设计简单、编码与调制分离的优点，而MLC在逐次相消译码下表现出更好的性能。在本文中，我们提出了一种混合极化编码调制方案，位于BICM和MLC之间，其中一小部分的比特被分配给集分区（SP）标记，其余的比特被分配给格雷标记。SP标记的比特使用类似于MLC的迭代解调和极化解码进行顺序解调，而Gray标记的比特首先被并行解调，然后被发送用于类似于BICM的解码。极化码或其他信道码（诸如LDPC码）可以用于格雷标记的比特。对于256-QAM上的长度为2048的1/2极化码，混合方案几乎可以完全消除BICM（仅Gray标记）和MLC（仅SP标记）之间的性能差距。值得注意的是，混合方案具有比MLC显著的延迟优势。这些性能增益使得所提出的方案对于诸如6 G的未来通信系统具有吸引力。
Bit-interleaved coded modulation (BICM) and multilevel coded modulation (MLC) are commonly used to combine polar codes with high order modulation. While BICM benefits from simple design and the separation of coding and modulation, MLC shows better performance under successive-cancellation de-coding. In this paper we propose a hybrid polar coded modulation scheme that lies between BICM and MLC, wherein a fraction of bits are assigned to set-partition (SP) labeling and the remaining bits are assigned for Gray labeling. The SP labeled bits undergo sequential demodulation, using iterative demodulation and polar decoding similar to MLC, whereas the Gray labeled bits are first demodulated in parallel and then sent for decoding similar to BICM. Either polar codes or other channel codes (such as LDPC codes) can be used for the Gray labeled bits. For length 2048 rate 1/2 polar code on 256-QAM, the performance gap be-tween BICM (Gray labeling only) and MLC (SP labeling only) can be almost fully closed by the hybrid scheme. Notably, the hybrid scheme has a significant latency advantage over MLC. These performance gains make the proposed scheme attractive for future communication systems such as 6G.