面向6G的编码调制和波形技术

Coded Modulation and Waveform Technology for 6G

针对未来6G对更高的频谱与功率效率,以及更高的可靠性与更低时延的技术指标需求,研究了基于LDPC码的混合多层编码(MLC)和比特交织编码调制(BICM)方案,与传统的BICM方案相比,所提方案能达到更好的误码率性能与更低的复杂度。在此基础上,面向未来6G移动通信中的高频段、高速移动场景,对新型波形技术——正交时频空(OTFS)调制技术的基本原理与性能进行了详细的讨论和分析。结果表明,与正交频分复用(OFDM)相比,OTFS具有更好的鲁棒性、更低的峰均比,并且具有得到全分集增益的潜力。

To meet the stringent requirements of the higher spectral and power efficiency, higher reliability and lower delay in future 6G communications, a hybrid multilevel coding(MLC) and bit-interleaved coded modulation(BICM) scheme is investigated based on low-density parity-check(LDPC) codes. Compared with the conventional BICM scheme, the proposed scheme achieves a better error performance with a lower complexity. Based on the proposed scheme, we further discuss and analyze the fundamental principle and performance of a novel waveform technology, i.e., orthogonal time frequency space(OTFS) modulation, for future 6G communications with high mobility and a high carrier frequency. Simulation results show that the OTFS modulation has a better robustness and a lower peak to average power ratio(PAPR) than the orthogonal frequency division multiplexing(OFDM), and also has the potential to obtain the full diversity gain.