中文说明：资源描述在多个发射天线，单天线，每个接收器的下行链路信道与有限的通道状态反馈，我们考虑下面的问题：给定一个约束上的总系统反馈负载，是最好的，以获得低利率/粗通道反馈从大量接收器或高速度/高品质的反馈从一个较小的接收器？获得反馈从多个接收器允许多用户分集被利用，而高速率反馈允许用于非常精确的波束形成方向选择。我们表明，有强烈的偏好获得高品质的反馈，并获得接近完美的信道信息，从许多尽可能的接收器提供了一个显着更大的总和速率比收集几个反馈位大量的用户。和公司的；和；
English Description：
Application backgroundIn a multiple transmit antenna, single antenna per receiver downlink channel with limited channel state feedback, we consider the following question: given a constraint on the total system-wide feedback load, is it preferable to get low-rate/coarse channel feedback from a large number of receivers or high-rate/high-quality feedback from a smaller number of receivers? Acquiring feedback from many receivers allows multi-user diversity to be exploited, while high-rate feedback allows for very precise selection of beamforming directions. We show that there is a strong preference for obtaining high-quality feedback, and that obtaining near-perfect channel information from as many receivers as possible provides a significantly larger sum rate than collecting a few feedback bits from a large number of users.