On shift sequences for interleaved construction of signal sets with low correlation
Yogesh Kumar, N. Rajesh Pillai · Journal of Discrete Mathematical Sciences and Cryptography · 2008
Construction of Signal sets with low correlation property is of interest to designers of CDMA systems. One of the preferred ways of constructing such sets is the Interleaved construction which uses two sequences a and b with 2-level autocorrelation and a shift sequence e . The shift sequence has to satisfy certain conditions for the resulting signal set to have low correlation properties. This article shows that the conditions reported in literature are too strong. We give a version which results in more number of sequence sets satisfying the same correlation bound. An open problem on existence of shift sequences for attaining an interleaved set with maximum correlation value of v+2 is also taken up and solved.