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Filter Size Determination Algorithms for Decision-Directed Channel Estimators in Wideband CDMA Mobile Communication Systems  

Rim, Min-Joong (Department of Information and Communication Engineering, Dongguk University)
Ryu, Chul (Department of Information and Communication Engineering, Dongguk University)
Ahn, Jae-Min (School of Electrical and Computer Engineering, Chungnam National University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.40, no.5, 2003 , pp. 171-180 More about this Journal
Abstract
CDMA(Code Division Multiple Access) mobile communication systems require accurate channel estimation in the receiver to compensate the fading distortions. Instantaneous channel estimates are obtained by dividing the received symbol by the transmitted symbol and then refined by filtering to reduce the estimation variance. In the channel estimation filter, the determination of the filter size is a very important task which greatly affects the estimation quality. While conventional methods usually use only velocity estimators to determine the channel estimation filter size, this paper proposes a filter size determination method for decision-directed channel estimators considering the symbol error rate and the signal-to-noise ratio in addition to the velocity of the mobile station. This paper shows that the symbol error rate and the signal-to-noise ratio are important factors for the determination of the channel estimation filter size.
Keywords
Channel Estimation; Decision-Directed; Filter Size; CDMA; Symbol Error Rate; Signal-to-Noise Ratio;
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Times Cited By KSCI : 1  (Citation Analysis)
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