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Comments on “New Constructions of Perfect 8-QAM+/8-QAM Sequences”
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2015/06/01
Online ISSN: 1745-1337
Type of Manuscript: LETTER
Category: Information Theory
perfect 8-QAM+ sequences, decimation, reversal, interleaved sequences,
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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.