采用机会载波配对波束成形的OFDMA下行网络高能效资源分配理论和方法

In order to support high data-rate user access at any time from any place, next-generation wireless broadband downlink networks will deploy relay-aided OFDMA transmission. However, the bases and relay stations lead to high power consumptions in addition to signal transmisison power consumption, which leads to a significant degradation of network energy efficiency (EE). Under the double pressure from reducing the operation cost and energy saving, the network EE must be improved. Current research work proposes transmission schemes and related resource allocation algorithms. However, the existing works can not freely utilize network resources at the best, and did not study in depth the impact of spectral efficiency on the EE. To address the above problems, this project will be based on the Opportunistic Subcarrier Pairing and Beam Forming transmission protocol proposed in previous work, establish an analytical model for network EE, explore the impact of network spectral efficiency on the EE, design resource allocation algorithms to maximize the EE, so as to provide theoretical support and reference methods for high-EE design of relay-aided OFDMA networks. This work has both theoretical and practical values.

为支撑随时随地要求高速接入的用户需求，下一代无线宽带下行网络将采用中继OFDMA传输技术，但是基站和中继站的电路设备会造成除发射功率之外的功率开销，导致网络能效性能显著降低。在降低运营成本和节能减排的双重迫切压力下必须提高网络能效。已有研究工作针对中继OFDMA下行网络设计了传输方案，并设计了节能或最大化能效的资源分配算法。但是，已提出通信机制以及资源分配算法不能灵活自由地充分利用网络资源，未能深入研究网络频谱效率对于能量效率的影响机理。本项目拟针对上述问题，在前期工作提出的基于机会式载波配对和波束成形(OSPBF:Opportunistic Subcarrier Pairing and Beam Forming)机制的基础上，建立网络能效模型，探索网络谱效对能效的影响机理，设计最大化网络能效的资源分配算法，为高能效中继OFDMA网络优化设提供理论依据和参考方案，具有理论和应用价值。

课题组按照拟定计划，以部署多中继站并采用OSPBF(OSPBF: Opportunistic Subcarrier Pairing and Beam Forming)的OFDMA (Orthogonal Frequency Devision Multiple Access)下行通信网络为研究对象，针对其在频域存在多载波、时域存在多时隙、空域存在多中继、用户域存在多终端的资源丰富特点，以及OSPBF能全面灵活地调度利用以上所有资源的优势，依次研究了网络能效性能建模、OSPBF 网络的谱效对于能效影响机理、最大化OSPBF网络能效的资源分配算法设计、以及提升OSPBF网络能效的低复杂度资源分配算法设计，成功实现了拟定的研究目标。上述成果能够为采用OSPBF的OFDMA下行网络的能效性能建模提供重要的理论基础；并且能够为提升上述网络的能效性能设计提供实际方案。