保障用户最小速率需求的中继OFDMA网络高能效优化设计研究

In order to meet fast growing broadband access requirements at any time and any place, next-generation OFDMA downlink networks will install many relay stations, which facilitates the use of frequency and spatial diversity to improve network coverage and performance. The circuit power introduced by the base and relay stations will decrease the energy efficiency of the networks significantly. Hence, there exist urgent needs in relay-aided OFDMA downlink to use transmission schemes which can fully utilize network resources, as well as energy efficient (EE) resource allocation (RA) to improve EE while guaranteeing user minimum rate requirements, and understanding of the impact of network parameters on EE. To address these issues, we will consider the transmission schemes proposed in our previous works for the AF/DF relay-aided OFDMA networks, establish EE models for the networks taking into account circuit power consumption; design RA algorithms which maximize the network EE under required minimum user constraints， and low-complexity algorithms which improve the network EE under required minimum user constraints; study the impact of network parameters on the performance of proposed algorithms. This project will provide practical RA algorithms as well as design guides to improve energy efficiency of AF/DF relay-aided OFDMA networks, and has important theoretical and practical values.

为满足用户迅猛增长的要求随时随地宽带接入的数据传输需求，下一代OFDMA下行网络将安装大量中继站，利用空间分集提升网络覆盖和性能。但是多站点引入的电路设备功率会显著降低网络的能量使用效率，因此亟需应用能够高度灵活使用网络资源的传输方案、提升能效并且保障用户最小速率需求的资源分配算法，并且深入了解网络参量对于能效的影响，进而指导高能效网络设计。为解决以上问题，本项目拟面向AF或DF中继OFDMA网络，应用前期工作提出的充分灵活利用网络资源的高自由度传输方案，在考虑基站和中继站电路设备功率的情况下建立网络能效性能模型；设计保障用户最小速率需求的最大化能效的资源分配算法和低复杂度资源分配算法；研究网络参量对于采用优化算法的网络能效的影响。本项目为中继OFDMA下行网络的高能效优化设计提供实际方案和指导依据，具有重要的理论和应用价值。

课题组围绕部署多中继站并采用高自由度传输协议的OFDMA下行传输网络，针对其在空域存在多个中继站资源、在频域存在丰富载波资源、在用户域存在大量终端，以及高自由度传输协议能够全面灵活地调动所有空域、频域、用户域资源对高能效资源分配方案设计提出的挑战难题，循序渐进地研究了网络能效建模、最大化能效资源分配算法设计、以及提升能效的低复杂度资源分配算法设计问题。课题组完成了拟定的研究目标，最终形成了一套适用于中继协作OFDMA下行传输网络的能效建模和最大化能效的资源分配方案以及提升能效的低复杂度方案，并且通过仿真研究了设计参量对于网络能效的影响，为相关应用提供理论依据和设计指导。在执行研究计划并且实现研究目标的过程中，将研究成果总结发表为12篇期刊论文（其中7篇SCI收录，5篇中文期刊）和4篇国际会议论文（其中1篇EI收录、2篇ISTP收录、1篇待EI收录），申请了2项专利。