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Title: Permutation-based DCSK and multiple-access DCSK systems
Authors: Lau, FCM 
Cheong, KY
Tse, CKM 
Issue Date: Jun-2003
Source: IEEE transactions on circuits and systems. I, Fundamental theory and applications, June 2003, v. 50, no. 6, p. 733-742
Abstract: This paper presents a method for enhancing the differential chaos-shift-keying (DCSK) and multiple access DCSK systems. By introducing a permutation transformation which destroys the similarity between the reference and data samples in a DCSK system, the bit rate can be made undetectable from the frequency spectrum, thereby enhancing the data security. Using different transformations for different users, the interference between users in a multiple-access system can be minimized, and each symbol is ensured to be sent within one bit duration for all users. Furthermore, the implementation requires only slight modification to the original DCSK system.
Keywords: Chaos communication
Differential chaos-shift-keying
Multiple access
Publisher: Institute of Electrical and Electronics Engineers
Journal: IEEE transactions on circuits and systems. I, Fundamental theory and applications 
ISSN: 1057-7122
DOI: 10.1109/TCSI.2003.812616
Rights: © 2003 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
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