Coherent Detection for DS/CDMA System with M-Ary Orthogonal Modulation in Multipath Fading Channels

Sung-Jin KANG  Min-Goo KANG  Chang-Eon KANG  Norihiko MORINAGA  

IEICE TRANSACTIONS on Communications   Vol.E82-B    No.7    pp.1084-1087
Publication Date: 1999/07/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Mobile Communication
M-ary orthogonal modulation,  DS/CDMA,  channel estimation,  coherent detection,  

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In this letter, we propose the channel estimation technique in the uplink of a DS/CDMA system with M-ary orthogonal signaling over multipath fading channels. The channel estimation is carried out using the maximum correlator output of RAKE receiver. With the estimated channel parameters, the RAKE receiver can coherently combines the received multipath signals, resulting in a significant performace improvement. The hardware complexity of the proposed detection technique is slightly increased when compared to that of noncoherent detection.