A Direct Construction of Cross Z-Complementary Sets with Flexible Lengths and Large Zero Correlation Zone
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This letter proposes a direct construction for cross Z-complementary sets (CZCSs) with flexible lengths and a large zero correlation zone (ZCZ). CZCS is an extension of the cross Z-complementary pair (CZCP). The maximum possible ZCZ width of a CZCP is half of its sequence length. In this letter, for the first time, a generalized Boolean function based construction of CZCSs with a large number of constituent sequences and a ZCZ ratio of 2/3 is presented. For integers m and δ, the proposed construction produces CZCS with length expressed as 2^m-1+2^δ (0 ≤δ <m-1,m≥ 4), where both odd and even lengths CZCS can be obtained. Additionally, the constructed CZCS also feature a complementary set of the same length. Finally, the proposed construction is compared with the existing works.
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