Quasi-Decorrelating Detector (QDD) And Its Spreading Codes Dependent Performance Analysis

Hsiao-Hwa CHEN  Hak-Keong SIM  

Publication
IEICE TRANSACTIONS on Communications   Vol.E80-B   No.9   pp.1337-1344
Publication Date: 1997/09/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Mobile Communication
Keyword: 
CDMA,  multiuser detection,  decorrelator,  spreading code,  

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Summary: 
This paper proposes a new multiuser detector, quasi-decorrelating detector (QDD), for a synchronous CDMA system. The QDD has the same complexity as that of decorrelator detector (DD) although it uses feedback loops, the number of which is adjustable to balance the near-far resistance and noise enhancement. The results show that the QDD outperforms the DD under various operational conditions. The impact of different spreading codes on the performance of the QDD is studied. It is shown that the Gold code is the best spreading code suitable for the QDD.