【作者】 王东；

【导师】 冯文江；

【作者基本信息】 重庆大学 ， 通信与信息系统， 2012， 硕士

【摘要】 协同通信作为一种分布式虚拟多天线传输技术，融合了空间分集和中继传输的性能优势，在多用户环境中相邻用户彼此协作，不增加终端天线数，就能获得分集增益，提高传输性能。OFDM具有良好的抗干扰能力、频谱利用率高，是新一代移动通信系统物理层的首选技术之一。将协同通信与OFDM结合，能提高无线通信传输的有效性和可靠性。本文以OFDMA协同通信系统为研究对象，探索单源多中继和多源多中继OFDMA协同通信系统无线资源分配策略，主要研究内容和取得的研究成果有：1）阐述OFDMA协同通信系统及其资源分配的技术基础：总结基于三节点模型的半双工解码-转发和放大-转发中继策略的原理、特点和性能；介绍OFDMA系统的工作原理；比较分析各种OFDMA协同通信系统资源分配算法的特点和优势。2）研究单源多中继OFDMA协同通信系统资源分配算法：以单源单中继系统最优功率分配与子载波配对策略为基础，探索单源多中继系统联合中继选择的子载波和功率最优分配策略，将优化问题建模为二元混合整数规划问题并进行分解，采用启发式优化算法求解，分别从性能改善和容量提升角度进行了仿真分析。3）研究多源多中继OFDMA协同通信系统资源分配算法：以追求资源分配公平性为目标，依据博弈论和纳什议价解，建立一种保证用户QoS需求且兼顾用户间公平性的资源分配模型；提出一种低复杂度的子载波分配算法，该算法在保证用户最低速率需求的前提下，公平分配子载波；依据中继剩余功率，设计一种基于二分搜索法的功率注水分配方案，进一步提高系统容量，分别从资源分配公平性和系统吞吐量角度进行了仿真分析。更多还原

【Abstract】 As a distributed virtual multiple antenna arrays transmission technology,cooperative communication combines the performance advantages of spatial diversityand relay transmission. In multi-user scenario, adjacent users cooperate to producespatial diversity gain to boost transmission performance without increasing the numberof antennas of any terminal. Meanwhile, OFDM has been selected as the coretechnology in physical layer of future wireless telecommunication system due to itsability to conquer multi-path fading and high utilization rate of frequency spectrum.Therefore, the validity and reliability of the wireless communication transmission willbe dramatically improved if OFDM and cooperative technology are combined together.Specific to OFDFA cooperative communications, the dissertation explores the resourceallocation strategies for OFDMA-based single-source multi-relay (SSMR) andmulti-source multi-relay (MSMR) cooperative communication systems. The maincontents and results achieved in the research go as follow:1) The technical foundation of OFDMA-based cooperative communication systemsand the corresponding resource allocation algorithms was discussed. Firstly, based onthe three-node model, the principles, characteristics and properties of the half-duplexamplified-and-forward and decoded-and-forward relaying were summarized. Then,principle of OFDMA system was introduced. Finally, the features and advantages ofvarious resource allocation algorithms for OFDMA-based cooperative communicationsystems were comparatively analyzed.2) Resource allocation algorithm for OFDMA-based SSMR cooperativecommunication systems was researched. Firstly, optimal power allocation and dual-hopsub-carrier matching problems of OFDMA-based single-source single-relay (SSSR)cooperative communication systems were analyzed. Based on these, the resourceallocation of multi-relay peer-to-peer communication systems was studied, and theoptimization problem was formulated as a mixed binary integer programming problemby jointly considering relay selection, dual-hop sub-carrier matching, and optimalpower allocation. Heuristic algorithms were proposed to decompose the originalproblem into two independent sub-problems for efficient solution. Finally, simulationsevaluated the performance improvement and the capacity enhancement respectively forthe proposed strategies. 3) Resource allocation algorithm for OFDMA-based MSMR cooperativecommunication systems was researched. Aiming at user fairness, a wireless resourceallocation model was established based on game theory and Nash Bargaining Solution(NBS), which insured certain QoS and fairness for users. A sub-optimal sub-carrierallocation algorithm was proposed in accordance with NBS, which could guarantee theminimum rate of each user, and allocate sub-carriers fairly to improve the systemcapacity at the same. According to residual power in relaying nodes, a water-fillingpower allocation scheme based on dichotomy was also studied after this sub-carrierallocation work. Simulations evaluated the resource allocation fairness and the systemthroughput respectively for the proposed strategies.更多还原