Before revision:  To satisfy the usage rules of Occupied Channel Bandwidth (OCB) of unlicensed spectrum, NR-U's PRACH and PUCCH , which are composed of CAZAC sequences, have to use some sequence repetition mechanisms in frequency domain , which brings more serious CM problems. Based on the characteristics of Constant Amplitude Zero Auto-correlation(CAZAC) sequences  , which are used for PRACH and PUCCH (refer to PUCCH format 1 and format ) in 5G , this paper proposes new mechanisms of CM reduction for PRACH and PUCCH with the repeated sequence in frequency domain considering the design principles to ensure the sequence performance of the auto-correlation and cross-correlation for CAZAC sequence-based PRACH and PUCCH .
After revision:  To satisfy the usage rules of Occupied Channel Bandwidth (OCB) of unlicensed spectrum, NR-U's PRACH and PUCCH , which are composed of CAZAC sequences, 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 , which are used for PRACH and PUCCH (refer to PUCCH format 1 and format ) in 5G , this paper proposes new mechanisms of CM reduction for PRACH and PUCCH with the repeated sequence in frequency domain considering the design principles to ensure the sequence performance of the auto-correlation and cross-correlation for CAZAC sequence-based PRACH and PUCCH .