A study of asymmetric ZCZ sequence sets

Authors:
Hideyuki Torii;Makoto Nakamura
Affiliations:
Department of Information Network and Communication, Kanagawa Institute of Technology, Atsugi-shi, Kanagawa, Japan;Department of Information Network and Communication, Kanagawa Institute of Technology, Atsugi-shi, Kanagawa, Japan
Venue:
ROCOM'11/MUSP'11 Proceedings of the 11th WSEAS international conference on robotics, control and manufacturing technology, and 11th WSEAS international conference on Multimedia systems & signal processing
Year:
2011

Citing 6
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Enhancement of ZCZ Sequence Set Construction Procedure*The material in this letter was presented at the 2nd International Workshop on Sequence Design and its Application in Communications, Shimonoseki, Oct. 2005. This work was supported by MEXT KAKENHI(17760321).

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Abstract

The present paper proposes two methods for constructing new asymmetric ZCZ sequence sets. ZCZ sequence sets are used as spreading sequences for AS-CDMA systems. An asymmetric ZCZ sequence set is a type of ZCZ sequence set and consists of multiple sequence subsets. Compared with conventional ZCZ sequence sets, the most important property of the proposed asymmetric ZCZ sequence sets is that the cross-correlation function between arbitrary sequences that belong to different sequence subsets has quite a large zero-cross-correlation zone. This property is useful for application to the AS-CDMA systems. If a cell is divided into concentric circles and each sequence subset is assigned to users existing in each area between two circles, then the proposed asymmetric ZCZ sequence sets can achieve much larger zero-cross-correlation zones than the conventional ZCZ sequence sets. The proposed asymmetric ZCZ sequence sets are expected to be useful for designing spreading sequences for AS-CDMA systems.