干扰受限蜂窝网下行分布式协作波束赋形技术的研究

项目名称： 干扰受限蜂窝网下行分布式协作波束赋形技术的研究

项目编号： No.61302068

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 无线电电子学、电信技术

项目作者： 徐静

作者单位： 西安交通大学

项目金额： 28万元

中文摘要： 在未来无线蜂窝系统中，如何解决小区边缘用户的干扰问题已经成为一个关键的挑战。近年来，被广泛研究的下行多基站协调波束赋形技术可以提高频谱效率，减少小区间干扰。在本项目中，首先从信息论的角度，对下行多基站协作波束赋形技术的信道容量外界进行研究，为设计贴近实际应用的分布式下行多基站协作波束赋形向量提供理论基础。然后，利用信号空间分集的特性研究多基站分布式协作调度传输框架，开采利用源自小区间链路的宏分集。接着，对基于统计信道状态信息的下行多基站协作波束赋形技术的信道容量外界进行研究，并在所提传输框架发射端只有统计信道状态信息的情况下进行性能分析和优化。最后，针对信道状态信息的不确定性，研究如何在最差情况下传输性能仍然比较好的"鲁棒性"层面对下行多基站协作波束赋形向量进行优化。

中文关键词： 协作波束成形；分布式波束成形；协作通信；协作通信系统；协作MIMO

英文摘要： In the future wireless cellular system, how to solve the interference in the cell boundary has become a key challenge. In recent years, downlink multiple base station coordination has obtain great attention to improve the spectrum efficiency and reduce the inter-cell interference. In this project, at first, from the information-theoretic perspective, the out boundary of the sum rate of downlink multi-cell cooperative transmission is studied, which provides the theoretical foundation of practical distributed cooperative beamforming design. Second, utilizing the characteristics of signal space diversity, the distributed coordination scheduling transmission framework is investigated to exploit the macro-diversity from inter-cell link. Third, considerting the case that only statistic channel state information is avalable at the transmitter, we study how to design the cooperative beamforming vectors correspondingly, and then perform the PEP analysis under the proposed transmmsion framework. In the end, focusing on the channel uncertainty, we try to design robust transmisson scheme even in the worst case, in other words, the precoding vectors in the proposed downlink scheduling scheme are optimized to combat the channel estimation error.

英文关键词： cooperative beamforming；distributed cooperative beamforming；cooperative communications；cooperative communications system；cooperative MIMO