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On the capacity of MIMO broadcast channel with partial side information

Sharif, Masoud and Hassibi, Babak (2003) On the capacity of MIMO broadcast channel with partial side information. In: Asilomar Conference on Signals, Systems and Computers, 37th, Pacific Grove, CA, 9-12 November 2003. Vol.1. IEEE , Piscataway, NJ, pp. 958-962. ISBN 0780381041.

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Since having full channel state information in the transmitter is not reasonable in many applications and lack of channel knowledge does not lead to linear growth of the sum rate capacity as the number transmit antennas increases, it is therefore of interest to investigate transmission schemes that employ only partial CSI. In this paper, we propose a scheme that constructs M random beams and that transmits information to the users with the highest signal-to-noise-plus-inferference ratios (SINRs), which can be made available to the transmitter with very little feedback. For fixed M and n increasing, the sum-rate capacity of our scheme scales as M log log n, which is precisely the same scaling obtained with perfect channel information. We furthermore show that linear increase in capacity can be obtained provided that M does not not grow faster than O(log n). We also study the fairness of our scheduling scheme and show that, when M is large enough, the system becomes interference-dominated and the probability of transmitting to any user converges to 1/n, irrespective of its path-loss. In fact, using M = α log n transmit antennas emerges as a desirable operating point, both in terms of providing linear increase in capacity as well as in guaranteeing fairness.

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Additional Information:© 2003 IEEE. Reprinted with Permission. Publication Date: 9-12 Nov. 2003. Posted online: 2004-05-04. This work was supported in part by the National Science Foundation under grant no. CCR-0133818, by the Office of Naval Research under grant no. N00014-02-1-0578, and by Caltech's Lee Center for Advanced Networking.
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Office of Naval Research (ONR)N00014-02-1-0578
Caltech Lee Center for Advanced NetworkingUNSPECIFIED
Subject Keywords:MIMO systems; antenna arrays; broadcast channels; channel capacity; signal interference; transmitting antennas; MIMO broadcast channel; channel state information; multiple antenna communications; signal-to-noise-plus-interference ratios; sum-rate capacity; transmit antennas
Record Number:CaltechAUTHORS:SHAasilo03
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:9749
Deposited On:16 Mar 2008
Last Modified:08 Nov 2021 21:01

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