Comments on “New Constructions of Perfect 8-QAM+/8-QAM Sequences”

Fanxin ZENG  

Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E98-A   No.6   pp.1334-1338
Publication Date: 2015/06/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E98.A.1334
Type of Manuscript: LETTER
Category: Information Theory
Keyword: 
perfect 8-QAM+ sequences,  decimation,  reversal,  interleaved sequences,  

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Summary: 
In Xu, Chen, and Liu's letter, two constructions producing perfect 8-QAM+/8-QAM sequences were given. We show that their constructions are equivalent to Zeng, et al.'s constructions under unit constant transform. Since the autocorrelation of a perfect sequence under unit constant transform is invariable, Xu, et al.'s constructions are the special case of Zeng, et al.'s constructions.