论文标题
C-RAN零强度使用不完美的CSI：分析和预言\＆量化反馈
C-RAN Zero-Forcing with Imperfect CSI: Analysis and Precode\&Quantize Feedback
论文作者
论文摘要
通过远程无线电头（RRHS）群的下行链路接头传输是增强未来蜂窝网络中吞吐量的重要技术。此方法需要在设计联合预码器的处理单元处的全球通道状态信息（CSI）。为此，必须在RRH和该单元之间共享大量CSI。本文提出了两项贡献。第一个是对利率损失的新上限，这意味着通过一组RRHS群的下限，该群体采用了与CSI不完整的RRHS群体获得的RRHS群。第二个贡献遵循了Bounds的见解，这是一种新的CSI共享计划，该计划大大降低了与收购全球CSI进行联合传输相关的大型开销。简而言之，每个RRH都应用一个局部的预编码矩阵，该矩阵会产生低维有效通道，可以更准确地使用较少的位来量化，从而减少了共享CSI的开销。除了CSI共享超空外，该方案还降低了必须将群集中每个RRH传递的数据速率。
Downlink joint transmission by a cluster of remote radio heads (RRHs) is an essential technique for enhancing throughput in future cellular networks. This method requires global channel state information (CSI) at the processing unit that designs the joint precoder. To this end, a large amount of CSI must be shared between the RRHs and that unit. This paper proposes two contributions. The first is a new upper bound on the rate loss, which implies a lower bound on the achievable rate, obtained by a cluster of RRHs that employ joint zero-forcing (ZF) with incomplete CSI. The second contribution, which follows insights from the bound, is a new CSI sharing scheme that drastically reduces the large overhead associated with acquiring global CSI for joint transmission. In a nutshell, each RRH applies a local precoding matrix that creates low-dimensional effective channels that can be quantized more accurately with fewer bits, thereby reducing the overhead of sharing CSI. In addition to the CSI sharing-overhead, this scheme reduces the data rate that must be delivered to each RRH in the cluster.
