认知无线网络中基于压缩感知的协作中继技术研究

An integration of cognitive radio and cooperative relay technologies, referred to as cognitive cooperative relaying, not only increases the spectrum resource utilization in cognitive wireless networks, but also significantly improves the information transmission capabilities of cognitive users. Meanwhile, compressed sensing is now emerging as a promising paradigm in signal processing field, which allows a signal to be sampled at a rate much less than the well-known Nyquist rate and provides an entirely new method for digital signal representation. Therefore, it has significant theoretic value and extensive application prospects to investigate an organic integration of the cognitive radio, cooperative relaying and compressed sensing for next-generation wireless communications. This project exploits the compressed sensing and cooperative relaying as two important techniques in cognitive wireless networks, with an emphasis on the exploration of compressed cooperative spectrum sensing, compressed sensing based cognitive cooperative relay transmission as well as compressed spectrum sensing and cognitive relay transmission tradeoff, aiming to improve the spectrum utilization and information transmission capabilities in cognitive cooperative relay networks. The purpose of this project is to achieve a new set of the compressed sensing based information transmission techniques in cognitive cooperative relay networks to fully utilize the spectrum resources, which would provide both theoretical and technical supports for next- generation wireless communication networks.

认知无线电和协作中继相互结合所构成的认知协作中继技术不但能有效提高无线频谱资源利用率，同时也能显著改善认知用户的信息传输能力。与此同时，压缩感知作为信号处理领域的新进展，可以实现对信号以远低于奈奎斯特采样率的速率进行全局观测，为信号的数字表示提供了一条崭新的途径。因而，将认知无线电、协作中继和压缩感知三者有机结合，研究认知协作中继网络中集三者于一体的无线通信技术具有重大理论价值和广泛应用前景。本项目将以认知无线网络为应用背景，采用压缩感知和协作中继两个重要技术手段，探索压缩协作频谱感知、压缩感知下的认知协作中继通信、以及压缩频谱感知与认知中继通信折中，以改善认知协作中继网络的频谱利用率和信息传输能力。旨在通过上述研究，实现一套基于压缩感知的认知协作传输技术，以提高认知协作中继网络中信息传输的有效性和可靠性，达到充分、高效利用频谱资源的目的，为新一代无线通信网络的实现提供理论支撑与技术支持。

摘要：. 无线通信系统日新月异的发展不断对频谱利用率和数据传输效率提出更高的要求。认知中继网络因为同时具备认知无线电的高效频谱利用率和协作中继技术的高分集增益两大突出优势，在高效合理利用频谱资源并提高无线链路可靠性等方面具有巨大潜力，而成为了当前无线通信领域的研究热点。本项目以认知无线网络为应用背景，采用协作中继和压缩感知两大关键技术，探索了在保证主用户服务质量的前提下，能够有效提高无线频谱利用率并显著改善认知传输容量的方法和技术手段。在项目进展过程中，本课题组不断在原有研究基础上发现新问题，并努力优化研究方案。目前，项目组主要在压缩协作频谱感知、压缩感知下的认知协作中继通信和认知无线网络安全性与可靠性折中等方面获得了一系列的理论突破。在本项目的支持下，项目组成员均取得了良好的成长进步。基于上述创新成果，项目组成员目前已在 Proceedings of the IEEE、IEEE Transactions on Communications、IEEE Journal on Selected Areas in Communications、IEEE Transactions on Industrial Informatics、IEEE Transactions on Vehicular Technology、IEEE Communications Magazine、IEEE Access 等权威学术期刊以及IEEE GLOBECOM、IEEE ICC等国际知名会议上发表高水平论文16篇，其中SCI检索论文12篇。项目组两位成员获得2015年度江苏省科学技术二等奖，并合作出版Springer英文学术专著1部。综上所述，本项目已按照预定计划开展，并超额实现了预期目标。在研究领域取得了一系列创新成果，也通过广泛的国际学术交流提升了团队影响力，培养了一批高水平人才。