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Polyphase Scrambled Walsh Codes for Zero-Correlation Zone Extension in QS-CDMA

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  • Polyphase complex scrambling patterns are designed to extend the zero-correlation zone (ZCZ) of a family of user spreading sequences, called properly scrambled Walsh-Hadamard (PSW) codes, recently proposed for quasi-synchronous (QS) code-division multiple-access systems. The merits of the binary (ZCZ equals 2) and quadri-phase (ZCZ equals 4) PSW codes over the existing QS spreading codes are still retained in the proposed polyphase PSW codes. Scrambling patterns for the case of ZCZ of 8 are derived first. Then, the scrambling pattern design rules are generalized for greater ZCZs and a structured procedure to generate polyphase PSW codes for any ZCZ is developed. Finally, the cross-correlation properties of the proposed spreading codes are evaluated.
  • This is the author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by IEEE-Institute of Electrical and Electronics Engineers and can be found at: http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=4234. ©2012 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
  • Keywords: zero-correlation zone (ZCZ), orthogonal spreading codes, Quasi-synchronous CDMA, scrambling.
  • Keywords: zero-correlation zone (ZCZ), orthogonal spreading codes, Quasi-synchronous CDMA, scrambling.
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  • Kwonhue Choi, & Huaping Liu. (2012). Polyphase scrambled walsh codes for zero-correlation zone extension in QS-CDMA. IEEE Communications Letters, 16(4), 429-431. doi: 10.1109/LCOMM.2011.112311.111380
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  • 16
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  • 4
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  • This research was cosponsored by the Ministry of Knowledge Economy, Korea, under the Information Technology Research Center support program supervised by the National IT Industry Promotion Agency (NIPA-2011-C1090-1131-0009) and Basic Science Research Program through the National Research Foundation funded by the Ministry of Education, Science and Technology, Korea (2008-0088286).
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