A Note on 8-QAM+ Sequences

Fanxin ZENG  Xiaoping ZENG  Zhenyu ZHANG  Guixin XUAN  

Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E97-A   No.3   pp.888-893
Publication Date: 2014/03/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E97.A.888
Print ISSN: 0916-8508
Type of Manuscript: LETTER
Category: Communication Theory and Signals
Keyword: 
complementary sequences,  8-QAM+ constellation,  ternary,  autocorrelation,  

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Summary: 
This letter presents three methods for producing 8-QAM+ sequences. The first method transforms a ternary complementary sequence set (CSS) with even number of sub-sequences into an 8-QAM+ periodic CSS with both of the period and the number of sub-sequences unaltered. The second method results in an 8-QAM+ aperiodic CSS with confining neither the period nor the number of sub-sequences. The third method produces 8-QAM+ periodic sequences having ideal autocorrelation property on the real part of the autocorrelation function. The proposed sequences can be potentially applied to suppression of multiple access interference or synchronization in a communication system.