中继辅助的单发单收信道速率极大化算法

摘要

考虑无线中继通信系统，一对单天线用户在多个多天线中继的辅助下通信。假设中继的功能仅简单地放大转发用户信号。本文建立了传输速率极大化的模型，以同时优化用户发送功率及中继转发矩阵。本文运用分式优化等技巧，将相应的优化问题转化为一系列二次约束二次规划子问题。通过显式表达式给出二次约束二次规划子问题的次优解。模拟实验表明，相比较已有的梯度法，本方法用非常少的时间、获得更高的传输速率。%Consider the channel model in wireless communications, where one user pair transmits signals aided by several multi-antenna relays. Suppose relays are using the amplify-and-forward protocol. This paper applies the frac-tional optimization technique, and turns the optimization problem into a series of Quadratic Constrained Quadratic Pro-gramming (QCQP) subproblems. The suboptimal solutions of the QCQP subproblems are provided by closed form so-lutions. Simulation results show that, the proposed algorithm achieves higher rate with much less computing time, compared to the existing gradient method.