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Optimizing User Selection Schemes in Vector Broadcast Channels

机译：在矢量广播频道中优化用户选择方案

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摘要

In this paper, we focus on the ergodic downlink sum-rate performance of a system consisting of a set of heterogeneous users. We study three user selection schemes to group near-orthogonal users for simultaneous transmission. The first scheme is a random selection policy that achieves fairness, but does not exploit multi-user diversity. The second scheme is a greedy selection policy that fully exploits multi-user diversity, but does not achieve fairness, and the third scheme achieves fairness while partially exploiting multi-user diversity. We also consider two beamforming methods for data transmission, namely, maximum-ratio transmission and zero-forcing beamforming. In all scheduling schemes studied in the paper, there is a key parameter that controls the degrees of orthogonality of channel directions between co-scheduled users. We focus on optimally setting this parameter for each scheduling scheme such that the ergodic downlink sum-rate is maximized. To this end, we derive analytical expressions for the ergodic downlink sum-rate considering each scheduling scheme. Numerical results are also presented to provide further insights.
机译：在本文中，我们重点研究由一组异构用户组成的系统的遍历下行链路总速率。我们研究了三种用户选择方案，以将近正交用户分组进行同时传输。第一种方案是实现公平性但不利用多用户分集的随机选择策略。第二种方案是一种贪婪选择策略，它可以充分利用多用户多样性，但不能实现公平性；第三种方案是在部分利用多用户多样性的同时达到公平性。我们还考虑了两种用于数据传输的波束成形方法，即最大比率传输和迫零波束成形。在本文研究的所有调度方案中，都有一个关键参数来控制共同调度用户之间信道方向的正交程度。我们专注于为每个调度方案最佳设置此参数，以使遍历下行链路总速率最大化。为此，我们考虑了每种调度方案，得出了遍历下行链路总速率的解析表达式。还提供了数值结果以提供进一步的见解。

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