CIF: Small: Limited Feedback and Information Exchange for Wireless Systems

商业蜂窝网络最近经历了对数据服务的需求的急剧增长。满足这一需求将需要大幅（数量级）增加频谱效率，可以实现这样的网络。 这将需要比现有系统更广泛的信息交换和网络节点之间的合作。 本研究探讨在蜂窝网络中节点之间的合作的反馈和信息交换的实用方法的基础上的可能途径。本研究的主题是在无线网络中的信道，干扰和服务质量的有限的状态信息的交换和利用技术。 重点是两个场景：点到点衰落链路的反馈，和两个合作基站之间的信息交换。 第一种情况旨在解决小区内的移动台的衰落所施加的限制，而第二种情况解决小区边界处的干扰所施加的限制。 目标之一是获得基本的理解到衰落信道的信道状态反馈和接收机状态反馈之间的权衡。 对于两小区的情况下，合作的资源分配和合作的编码和解码策略进行了研究。 重点是理解合作的好处，作为交换的信息量的函数，以及在时间，频率和空间上的相关资源分配。研究人员还研究了协作编码/解码与自适应技术的组合，用于预编码器优化，不依赖于信道测量的显式交换。

Commercial cellular networks have recently experienced a dramatic increase in demand for data services. Satisfying this demand will require substantial (order-of-magnitude) increases in the spectral efficiency that can be achieved by such networks. This will require much more extensive information exchange and cooperation among nodes in the network than in current systems. This research investigates possible approaches for cooperation among nodes in a cellular network based on practical methods for feedback and information exchange.The main theme of this research is on techniques for exchanging and exploiting limited state information about channels, interference, and quality of service in a wireless network. The focus is on two scenarios: feedback for point-to-point fading links, and information exchange between two cooperative base stations. The first scenario is meant to address limits imposed by fading for mobiles well within a cell, whereas the second scenario addresses limits imposed by interference at a cell boundary. One of the goals is to gain fundamental understanding into the trade-off between channel state feedback and receiver state feedback for fading channels. For the two-cell scenario, cooperative resource allocation and cooperative coding and decoding strategies are investigated. The emphasis is on understanding the benefits of cooperation as a function of the amount of information exchanged, and on associated resource allocation across time, frequency, and space. The investigators also study the combination of cooperative coding/decoding with adaptive techniques for precoder optimization, which do not rely on the explicit exchange of channel measurements.