A Novel Method of Sequence Pairs Set with Zero Correlation Zone Based on Interleaved Technique

In order to expand the choice of address codes of quasi-synchronous code division multiple access (QSCDMA) systems and to relax the limit on the related parameters, based on an arbitrary optimal sequence whose length is longer than 4, three classes of novel methods for constructing zero correlation zone (ZCZ) sequence pairs set are proposed via the interleaved technique and the recursive operation. In addition, the length of new sequence pairs and the ZCZ width can doubled through recursive operation, while keeping the number of the sequence pairs in the constructed ZCZ set unchanged. The constructed sequence pairs set in this paper is close to the theoretical bound, and thus once it is adopted to eliminate the co-channel interference in QSCDMA systems, the quality of system communication will be enhanced.