In the high-mobility scenarios of next-generation wireless communication systems (beyond 5G/6G), the performance of orthogonal frequency division multiplexing (OFDM) deteriorates drastically due to the loss of orthogonality between the subcarriers caused by large Doppler frequency shifts. Various emerging waveforms have been proposed for fast time-varying channels with excellent results. In this paper, we classify these waveforms from the perspective of their modulation domain and establish a unified framework to provide a comprehensive system structure comparison. Then we analyze bit error rate (BER) performance of each waveform in doubly selective channels. Through the discussions on their complexity and compatibility with OFDM systems, we finally give the candidate waveform suggestions.

翻译：在下一代无线通信系统(在5G/6G之后)的高度移动情景中,由于大型多普勒频率变化导致亚载体之间失去正向性,正对频率分多维化(OFDM)的性能急剧恶化,为快速时间变化的频道提出了各种新出现的波形,其效果极佳。在本文件中,我们从这些波形调制域的角度对这些波形进行分类,并建立一个统一框架,以提供全面的系统结构比较。然后,我们分析每个波形在双向选择性频道的微误率。我们通过讨论这些波形的复杂性和与DM系统兼容性,终于向候选的波形系统提出建议。</s>