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Reconstruction Methods of Tree Structure of Orthogonal Spreading Codes for DS-CDMA

Ushio YAMAMOTO, Haris HASANUDIN, Yoshikuni ONOZATO

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Summary :

In CDMA mobile system, network connection is constructed with orthogonal spreading codes assigned to each user in order to distinguish one from the other. The number of distinguishable codes and the process speed are different according to the orthogonal spreading factors which, in another literature, can be described as the tree structure. In this paper, we investigate methods to improve the quality of services (QoS) of communication, by changing the spreading factors of orthogonal spreading codes according to the number of users. We propose the effective method to reconstruct the tree structure of orthogonal spreading codes for supporting various data rates transmission in DS-CDMA mobile system. We compare spreading factors with and without the reconstruction and evaluate the effectiveness of the reconstruction method.

Publication
IEICE TRANSACTIONS on Fundamentals Vol.E83-A No.11 pp.2078-2084
Publication Date
2000/11/25
Publicized
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Type of Manuscript
Special Section PAPER (Special Section on Spread Spectrum Techniques and Applications)
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