Base Station Cooperation on the Downlink: Large System Analysis
Base Station Cooperation on the Downlink: Large System Analysis
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DOI：
10.1109/tit.2011.2177770
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发表时间：
2010-06
影响因子：
2.5
通讯作者：
R. Zakhour;S. Hanly
中科院分区：
文献类型：
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作者：
R. Zakhour;S. Hanly
本文考虑了在双小区系统中，每个基站（BS）被赋予多个天线的下行链路中最大化全网最小支持速率。这是针对不同级别的细胞合作而完成的。在一个极端，我们考虑单个小区处理，其中BS不注意它在另一个小区处产生的干扰。在另一个极端，我们考虑完全合作宏观波束形成。在这两者之间，我们考虑了协调波束成形，其考虑了小区间干扰，但不需要BS之间的完全合作。我们结合联合收割机要素的拉格朗日对偶性和大系统分析，以获得限制的信干噪比和比特率，允许所考虑的计划之间的比较。本文的主要贡献是定理，提供了简明的公式，最佳发射功率，波束成形向量，并实现信号干扰噪声比（SINR）的考虑计划。所得到的公式适用于每个小区的用户数K和每个基站的天线数N趋于无穷大的极限，其中固定比率β = K/N。这些定理还提供了用户占用的有效带宽的表达式，以及在相邻小区中引起的有效干扰，这允许所考虑的方案之间的直接比较。
This paper considers maximizing the network-wide minimum supported rate in the downlink of a two-cell system, where each base station (BS) is endowed with multiple antennas. This is done for different levels of cell cooperation. At one extreme, we consider single cell processing where the BS is oblivious to the interference it is creating at the other cell. At the other extreme, we consider full cooperative macroscopic beamforming. In between, we consider coordinated beamforming, which takes account of inter-cell interference, but does not require full cooperation between the BSs. We combine elements of Lagrangian duality and large system analysis to obtain limiting SINRs and bit-rates, allowing comparison between the considered schemes. The main contributions of the paper are theorems which provide concise formulas for optimal transmit power, beamforming vectors, and achieved signal to interference and noise ratio (SINR) for the considered schemes. The formulas obtained are valid for the limit in which the number of users per cell, K, and the number of antennas per base station, N, tend to infinity, with fixed ratio β = K/N. These theorems also provide expressions for the effective bandwidths occupied by users, and the effective interference caused in the adjacent cell, which allow direct comparisons between the considered schemes.