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A Novel Channel Estimation Method for Downlink Wideband CDMA Mobile Communication Systems  

임민중 (동국대학교 정보통신공학과)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.40, no.4, 2003 , pp. 1-9 More about this Journal
Abstract
Many CDMA systems provide pilot channels in order to help channel estimation process. Especially in wideband CDMA systems, the number of receive diversity paths can be large due to small chip duration and high multi-path resolution capability. Hence, the received signal power of each path is small for a given total SNR (signal-to-noise ratio) and the pilot power of each path may not be sufficiently large for accurate channel estimation. When the pilot power is small, one can use decision-directed channel estimation to utilize more energy of the received data. However, the decision errors can deteriorate the quality of decision-directed channel estimation. This paper proposes a novel channel estimation method that optimally utilizes receiver decisions as well as pilot symbols with the help of estimated SER (symbol error rate) and SNR. The proposed method computes two channel estimates using the pilot and the data channel filters and optimally combines them. The simulation results show that the proposed method is robust and outperforms the conventional pilot-symbol-aided channel estimation method.
Keywords
Channel estimation; Decision-directed; Pilot-symbol-aided; CDMA; Wireless;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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