面向6G系统的极化编码调制

未来6G系统的通信指标将有显著提升，同时应用场景更加多样化，对编码调制方案提出了更高的要求。面向6G系统，探讨了极化编码调制的应用优势。针对高谱效和低时延传输场景，分别阐述了多级码极化编码调制和比特交织极化编码调制的原理。在实际编码调制系统中，现有极化码构造算法存在复杂度高与灵活性差的问题。针对这些问题，提出了极化编码调制系统的通用构造框架。在多级码极化编码调制和比特交织极化编码调制两种方案下，详细论述了通用构造的具体操作流程。这类构造方法基于“和速率近似”的准则为极化分量码分配码率，能够实现不依赖于实际信道状态的通用构造，并显著降低系统构造的复杂度。仿真结果进一步验证了该方法的灵活性与通用性，并且可以获得比5G LDPC编码调制系统更好的性能。

Polar Coded Modulation for 6G System

The next 6th generation of mobile communications system (6G) will reveal significant improvements in the key performance indicators and support diverse communication scenarios. These put forward higher requirements on the coded modulation technologies. In this paper, the advantages of the polar-coded modulation (PCM) in 6G are first investigated. Then, the principles of multilevel PCM (MLC-PCM) and bit-interleaved PCM (BIPCM) are discussed for the high spectral efficiency and low latency scenarios, respectively. In practical PCM systems, the existing construction methods encounter the problems of high complexity and poor flexibility. To solve these problems, a universal construction framework of PCM is proposed, and the operating procedures in MLC-PCM and BIPCM are also discussed in detail. This construction method utilizes “sum rate approximation” to assign code rates to polar component codes, which performs independently of the actual channel conditions and can significantly reduce the construction complexity of PCM. Simulation results further verify its flexibility and universality with better performance than the 5G low-density parity-check (LDPC)- coded modulation schemes.