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引用次数: 10
摘要
本文研究了分布式天线系统中单用户发射分集问题。众所周知，在和功率约束(SPC)下，最大比传输可以使接收信噪比最大化(T. Lo, 1999)。论文(F. Boccardi and H. Huang, 2006)和(Wei Yu and Tian Lan, 2006)研究了具有单天线功率约束的多用户下行波束形成问题。在分布式天线系统中，对每个天线都施加一个通用的功率约束，即用户功率约束(user's power constraint, UPC)，以限制天线对期望用户的实际功率不高于该约束。研究了DAS系统在总功率约束和用户功率约束下的最优传输重量设计问题。将SPC和UPC下的权值设计问题表述为一个非线性优化问题，得到了与MRT同相位的最优权值向量。然后，将原问题转化为凸优化问题，用数值方法求出最优解。在此基础上，提出了一种求最优解的梯度- mrt算法
Transmit Diversity Method with User's Power Constraint for Distributed Antenna System
In this paper, we consider single user transmit diversity problem in distributed antenna system. As known, maximum ratio transmission can maximize the received SNR under sum power constraint (SPC) (T. Lo, 1999). Multi user downlink beamforming problem with per-antenna power constraint (PAPC) is considered in papers ((F. Boccardi and H. Huang, 2006), (Wei Yu and Tian Lan, 2006)). In this paper, a general power constraint named user's power constraint (UPC) is placed on each antenna in distributed antenna system, which limits antenna practical power for desired user not higher than the constraint. The optimum transmit weight designing problem is investigated under both sum power constraint (SPC) and user's power constraint (UPC) in DAS. The weight designing problem under SPC and UPC is formulated as a nonlinear optimization problem, and we find the optimum weight vector have the same phase as MRT. After that, we transform the primal problem to a convex optimisation problem, and numerical method can be used to get the optimal solution. Furthermore, an algorithm named gradient-MRT is proposed to find the optimal solution
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