标题： 联合波束成形与调度用于具有有限反馈的SDMA系统 显示英文标题

标题： Joint Beamforming and Scheduling for SDMA Systems with Limited Feedback

摘要： 在多天线广播（下行链路）信道中，同时向多个用户传输能够实现非常高的吞吐量。 不幸的是，这种多用户传输的最优方法，即脏纸编码，非常复杂。 因此，本文提出了一种实用的联合波束成形和调度方案，该方案通过量化信道状态信息的反馈来实现。 在此方法中，基站生成多组正交波束成形向量，并将每个向量与特定用户关联。 接下来，基站选择一组波束成形向量及其关联的用户进行下行链路传输，以使吞吐量最大化。 与最优方法不同，所提出的方案计算复杂度仅随用户数量线性增加，因为它不需要对所有可能的用户子集进行穷举搜索。 与Sharif\emph{等.}和Choi\emph{等.}最近提出的两种方案相比，本方案实现了更高的下行链路吞吐量，在选择波束成形向量时避免了多用户冲突，无需广播波束成形向量，并且有利于反馈压缩。 显示英文摘要

摘要： On a multi-antenna broadcast (downlink) channel, simultaneous transmission to multiple users is capable of achieving very high throughput. Unfortunately, the optimal approach for such multi-user transmission, namely dirty paper coding, is highly complicated. Therefore, this paper proposes a practical joint beamforming and scheduling scheme that is enabled by feedback of quantized channel state information. In this approach, the base station generates multiple sets of orthogonal beamforming vectors and associates each vector with a specific user. Next, the base station selects one set of beamforming vectors and the associated users for downlink transmission such that the throughput is maximized. Unlike the optimal approach, the proposed scheme has computational complexity that increases only linearly with the number of users since it does not require an exhaustive search over all possible subsets of users. Compared with two recently proposed schemes by Sharif \emph{et al.} and Choi \emph{et al.}, the present scheme achieves higher downlink throughput, avoids multi-user conflicts when selecting beamforming vectors, requires no broadcast of beamforming vectors, and facilitates feedback compression.