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|Title:||Cooperative multi-cell block diagonalization with per-base-station power constraints||Authors:||Zhang, R.||Keywords:||Block diagonalization
cooperative multi-cell system
multi-antenna broadcast channel
per-antenna power constraint
per-base-station power constraint
|Issue Date:||Dec-2010||Citation:||Zhang, R. (2010-12). Cooperative multi-cell block diagonalization with per-base-station power constraints. IEEE Journal on Selected Areas in Communications 28 (9) : 1435-1445. ScholarBank@NUS Repository. https://doi.org/10.1109/JSAC.2010.101205||Abstract:||Block diagonalization (BD) is a practical linear precoding technique that eliminates the inter-user interference in downlink multiuser multiple-input multiple-output (MIMO) systems. In this paper, we apply BD to the downlink transmission in a cooperative multi-cell MIMO system, where the signals from different base stations (BSs) to all the mobile stations (MSs) are jointly designed with the perfect knowledge of the downlink channels and transmit messages. Specifically, we study the optimal BD precoder design to maximize the weighted sum-rate of all the MSs subject to a set of per-BS power constraints. This design problem is formulated in an auxiliary MIMO broadcast channel (BC) with a set of transmit power constraints corresponding to those for individual BSs in the multi-cell system. By applying convex optimization techniques, this paper develops an efficient algorithm to solve this problem, and derives the closed-form expression for the optimal BD precoding matrix. It is revealed that the optimal BD precoding vectors for each MS in the per-BS power constraint case are in general non-orthogonal, which differs from the conventional orthogonal BD precoder design for the MIMO-BC under one single sum-power constraint. Moreover, for the special case of single-antenna BSs and MSs, the proposed solution reduces to the optimal zero-forcing beamforming (ZF-BF) precoder design for the weighted sum-rate maximization in the multiple-input single-output (MISO) BC with per-antenna power constraints. Suboptimal and low-complexity BD/ZF-BF precoding schemes are also presented, and their achievable rates are compared against those with the optimal schemes. © 2006 IEEE.||Source Title:||IEEE Journal on Selected Areas in Communications||URI:||http://scholarbank.nus.edu.sg/handle/10635/55441||ISSN:||07338716||DOI:||10.1109/JSAC.2010.101205|
|Appears in Collections:||Staff Publications|
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