Cubic metric reduction for repetitive CAZAC sequences in frequency domain

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