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Rate maximization in multi-antenna broadcast channels with linear preprocessing

Stojnic, Mihailo and Vikalo, Haris and Hassibi, Babak (2006) Rate maximization in multi-antenna broadcast channels with linear preprocessing. IEEE Transactions on Wireless Communications, 5 (9). pp. 2338-2342. ISSN 1536-1276.

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The sum rate capacity of the multi-antenna broadcast channel has recently been computed. However, the search for efficient practical schemes that achieve it is still ongoing. In this paper, we focus on schemes with linear preprocessing of the transmitted data. We propose two criteria for the precoding matrix design: one maximizing the sum rate and the other maximizing the minimum rate among all users. The latter problem is shown to be quasiconvex and is solved exactly via a bisection method. In addition to precoding, we employ a signal scaling scheme that minimizes the average bit-error-rate (BER). The signal scaling scheme is posed as a convex optimization problem, and thus can be solved exactly via efficient interior-point methods. In terms of the achievable sum rate, the proposed technique significantly outperforms traditional channel inversion methods, while having comparable (in fact, often superior) BER performance.

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Additional Information:© 2006 IEEE. Reprinted with permission. Manuscript received July 10, 2004; revised July 14, 2005; accepted October 18, 2005. [Posted online: 2006-09-06] The associate editor coordinating the review of this paper and approving it for publication was K. Narayanan. 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.
Funding AgencyGrant Number
David and Lucile Packard FoundationUNSPECIFIED
Caltech Lee Center for Advanced NetworkingUNSPECIFIED
Subject Keywords:Multi-antenna broadcast channel, convex problem, quasiconvex problem, bisection method, interior-point method
Issue or Number:9
Record Number:CaltechAUTHORS:STOieeetwc06
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6040
Deposited By: Archive Administrator
Deposited On:15 Nov 2006
Last Modified:02 Oct 2019 23:28

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