中继协作通信系统中的干扰对齐技术研究

Relay-based cooperation communication, with the distributive and cooperative operation, can improve the spectral efficiency and coverage extension of the network. However, since all nodes share the wireless channel to transfer message, multi-user interference is inevitably occuring, and this can degrade the system performance. Interference alignment can eliminate the inter-user interference effectively and achieve higher degrees of freedom by exploiting the cooperation. As such, interference alignment is worth exploring as an important technique in the intereference channel. In this project, we will study the relay-aided and multi-user communication theory and the interference cancellation technique based on interference alignment after building the typical relaying system models, in conjunction with multi-antenna technique and relay cooperative diversity. Besides, the reciprocity of two-way or multi-way relay channels will be utilized for designing the interference alignment schemes. Moreover, it is important to find the robust processing for interference alignment with only imperfect channel knowledge in the practical relay-aided communication scenarios due to the distributed cooperation. Beyond these, the system performance such as the sum capacity of the proposed scheme will be analyzed. Our work will provide an efficient way of improving the propagation efficiency significantly. And then, this project will give important theoretical foundation and technical support for the future communication systems.

中继协作通信基于分布式协作的方式能提高无线通信频谱效率和网络覆盖，但通信节点共享无线信道这一媒介会不可避免地出现多用户干扰，这将降低通信性能。干扰对齐技术能利用多用户协作通信有效消除干扰，充分挖掘通信网络的自由度，成为干扰信道中一项非常值得探索的重要技术。本项目拟从中继协作通信系统中基于干扰对齐技术展开新型中继通信理论和方法的研究，达到显著提高中继网络资源利用率的科学目标。拟建立典型的中继系统模型，研究融合多天线和中继协作分集等技术的基于干扰对齐的多用户中继传输理论；同时在双向/多向中继传输系统中充分考虑信道互易性特征，设计高效的干扰对齐实施方案；并研究由于中继通信分布式协作而必然利用不完全信道状态信息的实用的鲁棒干扰对齐技术；进而对所提传输方案根据信道传播特性发展网络的和容量等性能分析。这些研究将提供大幅提升无线网络传输效率的有效途径，为新一代移动通信的发展提供重要的理论依据和技术支撑。

本研究从中继协作通信系统中基于扰对齐技术展开中继通信理论和方法的研究，达到显著提高中继网络资源利用率的科学目标。建立典型的中继系统模型，研究融合多天线和中继协作分集等技术的基于干扰对齐的多用户中继传输理论。针对中继传输系统考虑计算前传中继，设计高效的干扰对齐实施方案，并理论分析了所提方案的自由度，证明其获得了巨大的性能增益；针对无线中继协作通信网络的实际情况，联合考虑通信节点的发射功率和电路处理功率，通过选择适当的中继并对其进行合理的功率分配来最大化接收信噪比；针对大维多天线多中继系统考虑复杂衰落信道，理论推导出的渐近容量性能。这些研究将提供大幅提升无线网络传输效率的有效途径，为新一代移动通信的发展提供重要的理论依据和技术支撑。