Optimal Mutually Orthogonal ZCZ Polyphase Sequence Sets

Fanxin ZENG
Xiping HE
Guixin XUAN
Wenchao ZHANG
Guojun LI
Zhenyu ZHANG
Yanni PENG
Sheng LU

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E101-A    No.10    pp.1713-1718
Publication Date: 2018/10/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E101.A.1713
Type of Manuscript: LETTER
Category: Information Theory
ZCZ sequence,  mutually orthogonal sequence set,  theoretical bound,  AS-CDMA,  

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In an approximately synchronized (AS) code-division multiple-access (CDMA) communication system, zero correlation zone (ZCZ) sequences can be used as its spreading sequences so that the system suppresses multiple access interference (MAI) and multi-path interference (MPI) fully and synchronously. In this letter, the mutually orthogonal (MO) ZCZ polyphase sequence sets proposed by one of the authors are improved, and the resultant ZCZ sequences in each set arrive at the theoretical bound regarding ZCZ sequences under some conditions. Therefore, the improved MO ZCZ sequence sets are optimal.