基于成对用户大规模MIMO两跳中继系统的最优能效设计

发布时间：2018-05-23 09:48

本文选题：大规模多输入多输出 + 两跳中继　；参考：《电子与信息学报》2017年01期

【摘要】：该文针对成对用户大规模MIMO中继系统,研究了最优能效准则下的系统参数设计。在中继采用最大比合并/最大比发射(MRC/MRT)预编码方案下,借助于大数定律,推导出能效函数关于用户发射功率、中继发射功率和中继天线数的解析表达式。根据能效函数性质,分别证明了全局最优发射向量和最优天线数的存在性和唯一性。为了求解最优发射功率,利用分数规划,将原优化问题转换为等价的减法形式,进而提出一种新的低复杂度迭代优化算法,并求得最优发射功率的闭合解。对于最优天线数,则利用Lambert W函数,得到了能效最大时的最优天线数闭合解。通过数值仿真,验证了所提功率优化算法以极少迭代次数取得了接近最优算法的性能,并验证了所给出的最优天线数闭合解的精确性。
[Abstract]:In this paper, the design of system parameters based on the optimal energy efficiency criterion is studied for large scale MIMO relay systems with pairs of users. Based on the law of large numbers, the analytical expressions of energy efficiency function for user transmit power, relay transmit power and relay antenna number are derived under the MRC / MRT precoding scheme. According to the properties of the energy efficiency function, the existence and uniqueness of the global optimal transmit vector and the optimal antenna number are proved respectively. In order to solve the optimal transmit power, the original optimization problem is transformed into the equivalent subtraction form by fractional programming, and a new low complexity iterative optimization algorithm is proposed, and the closed solution of the optimal transmit power is obtained. For the optimal number of antennas, the closed solution of the optimal number of antennas with maximum energy efficiency is obtained by using the Lambert W function. The performance of the proposed power optimization algorithm is verified by numerical simulation, and the accuracy of the closed solution of the optimal antenna number is verified with a small number of iterations.
【作者单位】：东南大学信息科学与工程学院;
【基金】：国家863计划项目(2015AA01A703) 国家自然科学基金(61372101,61271018,61671144) 江苏省科技计划项目(BE2015156) 江苏省高校自然科学研究面上项目(16KJB510008)~~
【分类号】：TN919.3

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