Antenna selection and transmit beamforming optimisation with partial channel state information in distributed antenna systems
Antenna selection and transmit beamforming optimisation with partial channel state information in distributed antenna systems
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DOI：
10.1049/iet-com.2013.1046
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发表时间：
2014-09
期刊：
影响因子：
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通讯作者：
Jiandong Li;Jilei Yan;Linjing Zhao;Quan Dong
中科院分区：
文献类型：
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作者：
Jiandong Li;Jilei Yan;Linjing Zhao;Quan Dong
研究了单小区多用户分布式天线系统下行链路的联合天线选择和发射波束成形优化问题，假设所有用户都是时延敏感的，并且在发射端只有部分信道状态信息可用。在每个分布式天线单元的最大发射功率的约束下，作者制定了一个优化问题，以最大限度地减少总功耗，同时保持每个用户的速率中断率低于一个阈值。为了减轻信令开销，他们首先提出了一种基于接收导频信号功率强度的自适应天线选择策略。然后，考虑到剩余的发射波束形成问题可能是不可行的和非凸的，一系列的松弛和凸近似应用。最后，他们提出了一种基于逐次凸逼近和用户准入控制的发射波束形成算法。仿真结果表明，该算法在满意用户率和总功耗方面都能获得接近最优的系统性能。
This study studies the joint antenna selection and transmit beamforming optimisation in the downlink of a single-cell multi-user distributed antenna system, assuming that all users are delay sensitive and only partial channel state information is available at the transmitter side. Under the constraint of the maximum transmit power of each distributed antenna unit, the authors formulate an optimisation problem to minimise the total power consumption while maintaining the rate outage ratio of each user below a threshold. To mitigate the signalling overhead, they firstly propose an adaptive antenna selection strategy based on the received pilot signal power strength. Then, considering that the remaining transmit beamforming problem may be infeasible and non-convex, a series of relaxation and convex approximation are applied. Finally, they propose a transmit beamforming algorithm based on successive convex approximation and user admission control. Simulation results show that the authors proposed algorithm can achieve a near optimal system performance in both the satisfied user ratio and total power consumption.