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On the throughput of broadcast channels with imperfect CSI

Vakili, Ali and Hassibi, Babak (2006) On the throughput of broadcast channels with imperfect CSI. In: 2006 IEEE 7th Workshop on Signal Processing Advances in Wireless Communications. IEEE , Piscataway, NJ, pp. 642-646. ISBN 978-0-7803-9710-1.

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In a broadcast channel in which one transmitter provides independent streams of data for n receivers, the amount of channel state information (CSI) at the transmitter can affect the capacity region dramatically. Having the accurate SNR of all users at the transmitter, the opportunistic strategy can be used to maximize the throughput (sum-rate) of the system. However, evaluating the SNR is basically an estimation problem at the receiver which in practice is not error free. In this paper, we analyze the effect of the noisy estimation of SNR on the throughput of a broadcast channel. We propose a modified opportunistic scheme in which the transmitter serves the user with the highest estimated SNR, but backs off on the transmit rate based on the variance of the estimation error. This scheme can achieve the maximum achievable rate while the CSI is limited to a noisy estimation of channel coefficients. We obtain the optimum rate back off and find the asymptotic behavior of the throughput under the scheduling scheme we have proposed. We show that the effect of a nonzero estimation error variance can be modeled as an SNR hit proportional to this variance.

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Additional Information:© 2006 IEEE. Issue Date: 2-5 July 2006. Date of Current Version: 16 April 2007. This work was supported in part by the National Science Foundation under grant no. CCR-0133818 and CCR-0326554, by the David and Lucille Packard Foundation, and by Caltech's Lee Center for Advanced Networking.
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David and Lucille Packard FoundationUNSPECIFIED
Caltech Lee Center for Advanced NetworkingUNSPECIFIED
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INSPEC Accession Number9487336
Record Number:CaltechAUTHORS:20110728-112210752
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Official Citation:Vakili, A.; Hassibi, B.; , "On the Throughput of Broadcast Channels with Imperfect CSI," Signal Processing Advances in Wireless Communications, 2006. SPAWC '06. IEEE 7th Workshop on , vol., no., pp.1-5, 2-5 July 2006 doi: 10.1109/SPAWC.2006.346484 URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:24582
Deposited By: Tony Diaz
Deposited On:29 Jul 2011 18:44
Last Modified:09 Nov 2021 16:25

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