In NR-based Access to Unlicensed Spectrum (NR-U) of 5G system, to satisfy the rules of Occupied Channel Bandwidth (OCB) of unlicensed spectrum, the channels of PRACH and PUCCH have to use some sequence repetition mechanisms in frequency domain. These repetition mechanisms will cause serious cubic metric(CM) problems for these channels, although these two types of channels are composed of Constant Amplitude Zero Auto-correlation(CAZAC) sequences.. Based on the characteristics of CAZAC sequences, which are used for PRACH and PUCCH (refer to PUCCH format 0 and format 1) in 5G NR, in this paper, we propose some new mechanisms of CM reduction for these two types of channels considering the design principles to ensure the sequence performance of the auto-correlation and cross-correlation. Then the proposed CM schemes are evaluated and the optimized parameters are further provided considering CM performance and the complexity.

中文翻译：

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5G、OFDM、立方公制、NR-U、占用信道带宽、CAZAC、Zadoff-Chu 序列

在5G系统的基于NR的非授权频谱接入（NR-U）中，为了满足非授权频谱占用信道带宽（OCB）的规则，PRACH和PUCCH的信道必须在频域中使用一些序列重复机制。这些重复机制会对这些信道造成严重的立方度量（CM）问题，尽管这两种信道是由恒定幅度零自相关（CAZAC）序列组成的。 基于 CAZAC 序列的特性，用于 PRACH和 PUCCH（参见 PUCCH 格式 0 和格式 1）在 5G NR 中，在本文中，我们考虑了设计原则，为这两种类型的信道提出了一些新的 CM 缩减机制，以确保自相关和互相关的序列性能。 -相关性。