Research On Construction Of ZCZ Sequence Pairs Set

CDMA mobile communication technology is meeting the large capacity, highquality, comprehensive business, soft switching, international roaming and so onrequirement of modern mobile communication network. The principle of CDMAtechnology is based on spread spectrum technology. Spread spectrum sequencecorrelation properties depends to a great extent, determines the size of the interference inCDMA system, which directly affect the performance of the system and the size of thesystem capacity. So, spread spectrum sequence design is one of the core subject ofCDMA technology. Zero correlation zone sequence pair have ideal correlation propertiesin the error range, used as spread spectrum sequence in the quasi synchronous CDMAsystem, is helpful to improve the quality of communication system. This paper mainly tothe ZCZ sequence pair set theory, construction method and its performance is analysedand studied.Firstly, based on arbitrary ZCZ sequence pairs and orthogonal matrix construct a setof mutually orthogonal ZCZ sequence pairs set. Select the appropriate shift sequencesand had to shift operations shift sequences, multiple shift equivalent shift sequences. Thenuse these shift sequences for ZCZ sequence pairs shift operation. Finally using theorthogonal matrix expansion, get a set of performance parameters at or near the bestmutually orthogonal ZCZ Sequence Pairs Set.Secondly, through interleaving technique and recursive algorithm, a new class ofnear-optimal ZCZ sequence pairs set generated from an arbitrary perfect sequence pair.In this paper, with the number of sequence pairs kept, the length of the sequence pairsand ZCZ width can be doubled. By this method constructed ZCZ sequence pairs set canapproach the mathematical bound.Finally, based on the traditional zero correlation zone sequences, through iterationweaving technology, extension to generate complementary forms of subset sequencepairs set. This class has both periodic complementary sequence pair set features, but alsohas zero correlation zone features, application of this kind of sequence can make the system have stronger ability to resist multipath interference and multi-accessinterference.