论文标题
无线功率传感器网络电源分配用于渠道估计和能量光束成形
Wirelessly-powered Sensor Networks Power Allocation for Channel Estimation and Energy Beamforming
论文作者
论文摘要
无线功率传感器网络（WPSN）在不同的监视应用程序中变得越来越重要。我们考虑一个WPSN，其中专门用于能量传输的多个安德滕纳基站发送飞行员信号以估计通道状态信息，从而将能梁变形为传感器节点。鉴于基站的固定能量预算，在本文中，我们研究了为通道估计和能量传输最佳分配功率的新颖问题。我们为一般信道估计和满足某些资格条件的光束成形方案制定了这个非凸优化问题。我们提供了一种新的解决方案方法和性能分析，以最佳和复杂性。我们还为基于最小平方通道估计和最大比率发射光束成型方案估算通道的情况提供了封闭式解决方案。与固定功率分配相比，分析和模拟表明网络传感速率的显着增长以及提高信道估计效率的重要性。
Wirelessly-powered sensor networks (WPSNs) are becoming increasingly important in different monitoring applications. We consider a WPSN where a multiple-antenna base station, which is dedicated for energy transmission, sends pilot signals to estimate the channel state information and consequently shapes the energy beams toward the sensor nodes. Given a fixed energy budget at the base station, in this paper, we investigate the novel problem of optimally allocating the power for the channel estimation and for the energy transmission. We formulate this non-convex optimization problem for general channel estimation and beamforming schemes that satisfy some qualification conditions. We provide a new solution approach and a performance analysis in terms of optimality and complexity. We also present a closed-form solution for the case where the channels are estimated based on a least square channel estimation and a maximum ratio transmit beamforming scheme. The analysis and simulations indicate a significant gain in terms of the network sensing rate, compared to the fixed power allocation, and the importance of improving the channel estimation efficiency.
