面向无线雾接入网的高能效传输理论研究及优化设计

With edge caching and edge computing, fog radio access networks (FRANs) has attracted considerable attention in recent years, due to significant performance benefits in fronthaul burden decrease and spectral efficiency improvement. However, the energy consumption of the system will increase to a certain extent due to edge caching and edge computing. Therefore, the energy efficiency in FRANs needs systematical investigation. In this project, the energy efficient transmission theory in FRANs will be analyzed from the information-theoretic point of view and novel energy-efficient transmission schemes for FRANs will be designed and optimized. First of all, the performance analysis of the energy efficiency will be derived for FRANs. The trade-off between energy efficiency and latency will be studied, and cache based opportunistic cooperative transmission schemes in FRANs will be investigated. The performance bounds of proposed schemes will be theoretically analyzed. Then, based on the performance analysis results, the energy efficient precoding matrix and power allocation vector in FRANs will be optimized. Based on antenna selection, user selection and interference cancellation, the low-complexity energy efficient joint optimization for precoding and power allocation will be further designed. Finally, the experimental platform will be established for efficient transmission schemes in FRANs to validate the correction of analysis for the performance bounds and the effectiveness of proposed transmission schemes.

无线雾接入网络由于引入了边缘缓存和边缘计算两项新技术，可以降低前向链路负载，提升网络频谱效率，已经受到了广泛关注。然而边缘缓存和边缘计算的引入也会在一定程度上造成系统能耗的提升，因此需要对无线雾接入网中的能量效率进行系统研究。本项目拟从信息论角度研究无线雾接入网的高能效传输理论，并优化设计无线雾接入网新型高能效传输方案。首先，从信息论角度深入分析无线雾接入网络的能效性能，研究能效时延折中问题和基于缓存的无线雾接入网机会协作传输方案，并理论分析其性能极限；其次，基于性能分析结果，优化无线雾接入网高能效预编码矩阵和功率分配向量，并基于天线选择、用户选择和干扰消除技术设计低复杂度高能效预编码功率分配联合优化方案；最后，搭建无线雾接入网络高能效传输方案实验演示平台，验证推导出的理论性能极限的正确性和所提传输方案的有效性。

项目主要围绕着无线雾接入网高能效传输理论开展了4个方面的研究工作，包括：第一方面的研究是无线物接入网中能效时延折中的理论分析，第二方面的研究是基于缓存信息的机会协作传输方案设计，第三方面的研究是无线雾接入网络中高能效资源分配优化设计，第四方面的研究是无线雾接入网络中低复杂度高能效协作传输方案的设计。所提方法在系统性能与系统能耗之间进行了折中，有效提升了无线雾接入网的传输能效，形成了若干具有自主知识产权的无线雾接入网高能效传输方案。发表了SCI、EI论文10余篇，发明专利申请或授权6项。本项目最终研究成果有望为基于无线雾接入网的下一代移动通信系统高能效传输打下扎实的理论基础并提供关键技术储备。