Construction of Mutually Orthogonal Zero Correlation Zone Polyphase Sequence Sets

Yubo LI  Chengqian XU  Kai LIU  

Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E94-A   No.4   pp.1159-1164
Publication Date: 2011/04/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E94.A.1159
Print ISSN: 0916-8508
Type of Manuscript: LETTER
Category: Information Theory
Keyword: 
QS-CDMA(quasi-synchronous CDMA),  interleaving iteration,  DFT matrices,  ZCZ (zero-correlation zone) sequence set,  mutually orthogonal,  

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Summary: 
In this paper, two constructions of mutually orthogonal zero correlation zone polyphase sequence sets are presented. The first one is based on DFT matrices and interleaving iteration. After each recursive step, the period of sequence and the length of zero-correlation zone are two times larger than that in the last step. The second method, based on DFT matrices and orthogonal matrices, can generate numbers of mutually orthogonal optimal ZCZ sequence sets whose parameters reach the theoretical bounds by using interleaving and shifting techniques. As a result, the algorithms proposed can provide more sequences for the QS-CDMA (quasi-synchronous CDMA) systems.