New non-blocking EOVSF codes for multi-rate WCDMA system

Authors:
Yih-Fuh Wang;Hsing-Hu Chen;Tun-Ying Lin
Affiliations:
Leader University, Tainan, Taiwan, ROC;Leader University, Tainan, Taiwan, ROC;Leader University, Tainan, Taiwan, ROC
Venue:
Proceedings of the 2006 international conference on Wireless communications and mobile computing
Year:
2006

Citing 2
Cited 1

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CDMA: principles of spread spectrum communication
Spreading codes for direct sequence CDMA and wideband CDMA cellular networks

IEEE Communications Magazine

Non-blocking extended OVSF codes on multi-rate CDMA systems

Computer Communications

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Abstract

Orthogonal variable spreading factor (OVSF) codes are employed in the third generation (3G) wideband code division multiple access (WCDMA) wireless system as channelization codes. Any two codes OVSF of different levels are orthogonal if and only if one of two codes is not ancestor/descendant in each other. Therefore, when an OVSF code is assigned to a user, it blocks all of its ancestor and descendant codes. This results in a major drawback of OVSF codes, called blocking property: When an OVSF code is assigned, it blocks all of its ancestor and descendant codes from assignment because they are not orthogonal to each other. This paper presents a new extended orthogonal variable spreading factor (EOVSF) codes to support a quite large number code candidates for more user used in multi-rate next-generation wireless system. Thereby, no EOVSF code blocks the assignment of any other EOVSF code. It decreases more reject probability in WCDMA system.