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arXiv 1111.6223cs.ITmath.IT
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多小区网络下行链路协调线性传输波束形成器设计的下界优化

Lower Bounds Optimization for Coordinated Linear Transmission Beamformer Design in Multicell Network Downlink

Mingyi Hong, Alfredo Garcia, J. Joaquin Escudero Garzas, Ana Garcia-Armada

摘要:

我们考虑在蜂窝网络中的协调下行链路波束成形问题的基站(BS)配备多个天线,每个用户配备一个单一的天线。基站之间相互协作,共享本地干扰信息,以最大化网络中用户的总速率为目标。一组新的下界(一个边界为每个BS)的非凸和率被确定。这些边界促进了一组算法的开发,这些算法允许BS通过优化它们各自的下限来更新它们的波束。我们表明,当有一个用户每BS,下界最大化问题可以解决的秩-1解决方案。在这种情况下,总的和速率最大化问题可以求解到KKT点。数值结果表明,所提出的算法实现了高的系统吞吐量与减少回程信息交换的BS之间。

英文摘要:

We consider the coordinated downlink beamforming problem in a cellular network with the base stations (BSs) equipped with multiple antennas, and with each user equipped with a single antenna. The BSs cooperate in sharing their local interference information, and they aim at maximizing the sum rate of the users in the network. A set of new lower bounds (one bound for each BS) of the non-convex sum rate is identified. These bounds facilitate the development of a set of algorithms that allow the BSs to update their beams by optimizing their respective lower bounds. We show that when there is a single user per-BS, the lower bound maximization problem can be solved exactly with rank-1 solutions. In this case, the overall sum rate maximization problem can be solved to a KKT point. Numerical results show that the proposed algorithms achieve high system throughput with reduced backhaul information exchange among the BSs.

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