面向能量受限网络的双路径协同中继传输研究

Two-path cooperative relay transmission is able to reduce the transmission time by properly scheduling the relay nodes, capable of approaching the system performance of full-duplex relay without change the hardware of the half-duplex devices. It can improve network spectral efficiency and transmission efficiency, having very wide applications. However, if one wants to employ the two-path cooperative relaying transmission into energy-constrained wireless networks, there are still a lot of fundamental theoretical and technical problems required to study. This project aims to study the two-path cooperative relay transmission mechanism in energy-constrained wireless networks, then design efficient multi-user two-path cooperative relay transmission solution to improve spectrum efficiency and energy efficiency of energy-constrained wireless networks. We first study the inter-relay interference (IRI) suppression by combining multi-antenna and the caching relay scheduling, and then use convex optimization and stochastic processes to design and optimize the two-path cooperative relay transmission strategy for energy-constrained wireless networks, further investigate the two-path cooperative relay transmission with energy harvesting (EH) technology to prolong the node life-time. The research work of this project will help to understand the two-path cooperative relay very well, and promote its practical application in future wireless networks, which shall also provide some theoretical basis on spectral efficiency enhancement in energy constrained wireless network and some effective solutions to enhance the transmission efficiency to prolong node life-time for energy-constrained wireless networks.

双路径协同中继传输通过对中继节点的接续调度，可缩短传输时间，在半双工网络中不用设备升级改造，便可近似达到全双工中继效果，能极大提升网络频谱效率和传输效率，应用前景和价值巨大。然而要让双路径协同传输在物联网等能量受限网络中充分发挥优势，很多理论和技术问题亟待突破。本课题旨在研究双路径协同中继传输在多用户能量受限网络中的传输机理、机制，设计高效的多用户双路径协同中继传输方案，实现多用户能量受限网络频谱效率及能量效率的提升。课题首先基于多天线、缓存中继调度研究双路径协同传输中继间的干扰抑制机制，接着利用凸优化和随机过程等工具设计并优化面向多用户能量受限网络的双路径协同传输策略，进一步结合能量收集等技术研究“绿色”双路径协同中继传输方案，增强网络节点续航能力。本课题有利于推动双路径协同中继传输在未来无线网络中实际应用，为提升能量受限无线网络频谱效率、传输效率和延长生存周期提供有效解决思路与途径。

近年来，随着信息技术的高速发展，越来越多的移动智能终端作为网络节点接入到网络中，海量的数据在网络边缘处产生，并在无线信道中传输。而处于边缘处的网络节点往往资源、能量有限；而无线通信信道也往往受传输速率与功率的影响，从而导致网络资源的优化、协同面临着诸多矛盾和挑战。因此本项目针对当下移动智能网络环境中能量受限、信息不同步、编码性能低等缺点开展研究具有时空特性的网络编码技术，提出1）Nakagami-m衰落信道上的具有多个中继的时空网络编码方案；2）数字网络编码辅助双路径中继OFDM网络中的传输时间最优化；3）具有数据速率公平性的网络编码双路径中基于功率分配的无线携能通信。项目针对能量受限网络中的双路径协同中继研究，构建了一套完整的资源优化、资源协同体系，为为面向能量受限网络的双路径传输研究的发展提供具有价值的研究成果和结论。