干扰多址接入信道中干扰对齐与删除技术研究

项目名称： 干扰多址接入信道中干扰对齐与删除技术研究

项目编号： No.61501404

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 无线电电子学、电信技术

项目作者： 靳进

作者单位： 郑州大学

项目金额： 19万元

中文摘要： 干扰对齐技术在自由度提升方面取得的重大理论突破促使其成为5G多点协作通信的重要策略之一，作为干扰对齐技术的新型分支，干扰对齐与删除技术（IAC）能够进一步提高传统干扰对齐的自由度性能。然而，IAC技术的自由度界限尚未得到论证，且实用化推广受到backhaul开销的制约。本项目针对广义干扰多址接入信道系统，探索IAC技术闭式解可达的自由度下界，并研究降低backhaul开销的实用化方案，具有重要的理论意义和实用价值，具体研究内容包括：分析天线配置与自由度的内在关联，利用最少天线配置生成最长对齐连通链，获得最大干扰重叠比，构造自由度性能最优的IAC闭式解，由此得到自由度下界；由backhaul链路中数据传递路径的指向性确立数据传递路径的优化原则，基于最长对齐连通链，在优化原则的指导下改进对齐连通链外干扰信道的合并方向，确定IAC方案获得特定自由度时backhaul开销与数据交互跳数的最低界限。

中文关键词： 空域干扰对齐；协作通信；干扰抑制

英文摘要： Interference alignment is one of the inter-node coordination strategies for the 5G system, since it has recently produced many theoretical breakthroughs with respect to increasing the degrees of freedom (DoF). As a new branch of interference alignment, interference alignment and cancellation (IAC) can achieve more DoF than conventional interference alignment. However, the DoF bound of IAC has not been revealed so far, and the practical implementation of IAC is fundamentally limited by backhaul overhead. In this project, we study the DoF inner bound achieved through closed-form IAC solutions, as well as practical IAC schemes with low backhaul overhead for a interfering multiple access channel, both of which have important theoretical and practical value. More details of our research are given as follows. After analyzing the relationship between antenna configuration and spatial DoF, we create the longest connected alignment chain exploring the minimum antenna resources, so as to obtain the maximum interference compression ratio. Then, the DoF inner bound can be derived through finding the optimal closed-form IAC solution. Besides, we establish the optimization principle for the data-exchanging path in the backhaul links inspired by the inherent orientation of data-exchanging path, and then adjust alignment directions of the interference channels which are outside the connected alignment chain following our established principle. Finally, to achieve a given DoF requirement by IAC schemes, the minimum backhaul overhead and number of time slots for data-exchanging are found.

英文关键词： Spatial Interference Alignment;Cooperative Communication;Interference Suppression