Interference Suppression Based on Code Grouping and Groupwise Decorrelation in Multirate W-CDMA Downlink

Won HA
Junghwa BAE
Jinwoo PARK

IEICE TRANSACTIONS on Communications   Vol.E87-B    No.10    pp.3125-3129
Publication Date: 2004/10/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
W-CDMA downlink,  interference suppression,  OVSF,  code-grouping,  groupwise decorrelation,  

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In this paper, we presented a new interference suppression method based on groupwise decorrelation for the multirate wideband-code division multiple access (W-CDMA) downlink. Code grouping in the proposed method is performed according to the correlation property between the mother code and the child code in the orthogonal variable spreading factor (OVSF) code tree. The decorrelation process based on the grouped codes, so called groupwise decorrelation, is then performed to suppress the interference induced in the downlink propagation. We demonstrate that the proposed method can enhance the performance significantly, with lower computational complexity and higher operational efficiency in which any information about interference users (code, data, amplitude) is not required to know in prior at the detection stage.