New Binary Functions for Generating Spreading Codes with Negative Auto-Correlation for Asynchronous DS/CDMA Using Bernoulli Chaotic Map

Tin Ni Ni KYAW  Akio TSUNEDA  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E100-A   No.4   pp.961-964
Publication Date: 2017/04/01
Online ISSN: 1745-1337
Type of Manuscript: Special Section LETTER (Special Section on Signal Design and Its Applications in Communications)
Category: Sequences
asynchronous DS/CDMA,  negative auto-correlation,  chaos,  Bernoulli map,  binary function,  

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Code division multiple access (CDMA) based on direct sequence (DS) spread spectrum modulation using spreading codes is one of standard technologies for multiple access communications. In asynchronous DS/CDMA communications, spreading codes with appropriate negative auto-correlation can reduce bit error rate (BER) compared with uncorrelated sequences. In this letter, we design new binary functions for generating chaotic binary sequences with negative auto-correlation using Bernoulli chaotic map. Such binary functions can be applied to the generation of spreading codes with negative auto-correlation based on existing spreading codes (e.g., shift register sequences).