基于全双工模式的中继协作通信系统关键技术研究

With the rapid emergence of smart phones as well as mobile new services, it is becoming increasingly difficult in accommodating an ever increased mobile traffic demand of customers relying on the relatively limited wireless spectrum. Cooperative communication technology may provide a suitable way toward relieving the above-mentioned tradeoff by substantially improving the wireless resource utilization and extending the radio coverage. However, the existed half-duplex (HD) relaying mode cannot substantially utilize the wireless spectrum resources, requiring the full-duplex (FD) technology, which enables the mobile devices to perform simultaneous transmission and reception with the same frequency band, to be studied by both academia and industry. However, there exist several key problems to be addressed in implementing FD systems, including: ①Self-interference cancellation in FD devices; ②Resource sharing in multi-relay cooperative communication networks; ③Relay-selection algorithms in multi-relay communication networks. In this project, the above-mentioned problems will be studied. The research results may significantly improve the self-interference cancellation capability of the FD devices, increase the network's resource utilization, data rate and load-balancing capability, and simultaneously enhance the reliability of the cooperative communication links, consequently facilitating a better service to the customers.

移动数据业务需求的指数增长与相对短缺的无线频谱资源之间的矛盾日益凸显。中继协作通信技术是有效缓解上述矛盾，显著提高无线频谱资源利用率与信号覆盖范围的重要手段之一。鉴于目前广泛采用的半双工模式中继技术导致有限的频谱资源不能得到充分利用，学术界和工业界已经开始探索研究全双工中继协作技术。借助于该技术，移动通信设备能够实现在同一频率上的同时信号接收与发送。相对于半双工模式，全双工技术在理论上能够实现无线频谱资源利用率的倍增。为了充分挖掘全双工技术的潜能，必须解决几个关键核心问题，包括：①全双工中继节点自干扰消除算法；②多中继协作通信网络中的资源共享问题；③多中继网络中的中继选择算法。本项目将围绕上述核心问题开展深入研究，研究成果将有效地提高全双工中继设备的自干扰消除能力，提高协作通信系统的频谱资源利用率、数据吞吐量和负载均衡能力，提升中继协作信道的可靠性，从而更好地满足用户的通信需求。

在自然基金委的资助下，自然基金青年项目《基于全双工模式的中继协作通信系统关键技术研究》 （批准号 61501182）开展了一系列全双工中继通信系统的研究，并取得了一系列成果。本课题也将成果进一步推广到了其它相关通信系统。本课题主要的研究成果主要归纳为 4 部分：(1) 双向全双工协作通信系统中继选择；(2) 全双工中继选择协作通信系统的功率分配算法；(3) 协作通信系统中的物理层安全；(4) 在 D2D 通信网络中应用全双工中继协作通信。本课题围绕基于全双工中继开展研究工作，共计发表论文 10 余篇，其中包括 SCI 论文 5 篇，发表在 IEEE Systems Journal, IEEE Communications Letters, Science China Information Sciences, KSII Transactions on Internet and Information Systems, China Communications等国内外知名通信期刊。本课题申请专利 7 项，培养硕士 6 名，达到了项目预期目标。