On Achievable Data Rates and Optimal Power Allocation in Fading Channels with Imperfect Channel State Information |
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| Authors: | Khaled Almustafa Serguei Primak Tricia Willink Kareem Baddour |
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| Affiliation: | (1) Department of Electrical and Computer Engineering, The University of Western Ontario, London, ON, Canada, N6A 5B9;(2) Communications Research Centre, P.O. Box 11490, 3701 Carling Avenue, Stn. H, Ottawa, ON, Canada, K2H 8S2 |
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| Abstract: | Achievable rates of wireless communication systems with pilot-based channel estimation are investigated for the case of time-selective
fading. Novel analytical expressions for the maximum achievable rates of such systems are derived in terms of the system signal-to-noise
ratio (SNR), fading rate and estimation scheme deployed. The frame size is optimized jointly based on the SNR and the fading
rate. The maximum rate achieving coding scheme is suggested and shown to be a modified version of the classical water-filling
algorithm that accounts for imperfect channel state information (CSI) at the transmitter. The impact of the estimation scheme
and the angular spread of the received signal on the quality of estimation and achievable rates is evaluated. A number of
numerical simulations are provided to illustrate the dependence of the optimal block length and achievable rates on SNR, fading
rate, estimation scheme and angular spread of the channel.
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| Keywords: | Capacity Optimal frame length Partial CSI Prediction |
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