多小区分布式天线系统高能效协同传输方案

发布时间：2019-05-30 06:42

【摘要】：该文将各分布式天线簇内的天线单元相关性纳入考虑,且在仅可获得包含发送端大尺度信道状态信息和发送天线单元相关特性的慢变信道统计特性的条件下,研究多小区分布式天线系统(distributed antenna system,DAS)的高能效协同传输问题,通过小区间协同优化输入协方差矩阵,使系统能效最大化。该优化问题为复杂的非凸问题,故难以求解。通过连续Taylor展开方法,使原问题转化成系列拟凸分式规划子问题,然后通过分式规划方法将其进一步转化成易处理的等价凸问题。据此,提供一种原优化问题的迭代法求解方案。仿真结果验证:相比已有方案,该方案改善了系统的能效水平。
[Abstract]:In this paper, the correlation of antenna elements in each distributed antenna cluster is taken into account, and only the slowly varying channel statistical characteristics including the large scale channel state information of the sender and the correlation characteristics of the transmitting antenna element can be obtained. The energy efficiency cooperative transmission problem of multi-cell distributed antenna system (distributed antenna system,DAS) is studied. the input covariance matrix is optimized by inter-cell cooperation to maximize the energy efficiency of the system. The optimization problem is a complex nonconvex problem, so it is difficult to solve. By means of continuous Taylor expansion method, the original problem is transformed into a series of quasi-convex fractional programming subproblems, and then it is further transformed into an equivalent convex problem which is easy to deal with by fractional programming method. Based on this, an iterative method for solving the original optimization problem is presented. The simulation results show that compared with the existing schemes, this scheme improves the energy efficiency of the system.
【作者单位】：清华大学电子工程系;中国电子科技集团公司电子科学研究院;
【基金】：国家“九七三”重点基础研究项目(2012CB316002) 国家“八六三”高技术项目(2015AA01A701) 国家科技重大专项(2014ZX03003003-002) 国家自然科学基金资助项目(61201192,61321061) 清华—高通联合研究项目
【分类号】：TN929.5

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