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arXiv 2007.12894eess.SPcs.SYeess.SY
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用于下行链路蜂窝多用户MISO的发射波束成形、IRS平台和功率分配SWIPT接收机的联合设计

Joint Design of Transmit Beamforming, IRS Platform, and Power Splitting SWIPT Receivers for Downlink Cellular Multiuser MISO

Shayan Zargari, Shahrokh Farahmand, Bahman Abolhassani

摘要:

在下行链路模式下,考虑了具有智能反射面(IRS)平台的多天线基站(BS)和多个单天线用户。BS经由发射波束成形利用同时无线信息和功率传输(SWIPT)来向所有设备传送信息和功率。每个设备应用功率分割(PS)以将接收到的功率的单独部分专用于信息解码和能量收集。我们制定了一个总的发射功率最小化问题,共同设计的BS波束成形向量,IRS相移,PS比在接收机的最低速率和收获的能量服务质量(QoS)的约束在所有的接收机。首先,我们开发了一个块坐标下降算法,也被称为交替优化,可以减少目标函数的每一次迭代,保证收敛。之后,两个低复杂度的次优算法,依赖于著名的最大比传输和迫零波束形成技术的介绍。当BS天线的数量和/或用户的数量很大,或者信道的相干时间很小时,这些算法是有益的。仿真证实了这样的期望,即通过部署无源IRS,BS功率可以降低$10-20$ dBw,同时保持类似的保证QoS。此外,即使提出的次优算法优于全局最优的SWIPT解决方案,没有IRS的一个适度数量的IRS元素。

英文摘要:

A multiple antenna base station (BS) with an intelligent reflecting surface (IRS) platform, and several single antenna users are considered in the downlink mode. Simultaneous wireless information and power transfer (SWIPT) is utilized by the BS via transmit beamforming to convey information and power to all devices. Each device applies power splitting (PS) to dedicate separate parts of received power to information decoding and energy harvesting. We formulate a total transmit power minimization problem to jointly design the BS beamforming vectors, IRS phase shifts, and PS ratios at the receivers subject to minimum rate and harvested energy quality of service (QoS) constraints at all the receivers. First, we develop a block coordinate descent algorithm, also known as alternating optimization that can decrease the objective function with every iteration with guaranteed convergence. Afterwards, two low-complexity sub-optimal algorithms that rely on well-known maximum ratio transmission and zero-forcing beamforming techniques are introduced. These algorithms are beneficial when the number of BS antennas and/or number of users are large, or coherence times of channels are small. Simulations corroborate the expectation that by deploying a passive IRS, BS power can be reduced by $10-20$ dBw while maintaining similar guaranteed QoS. Furthermore, even the proposed sub-optimal algorithms outperform the globally optimal SWIPT solution without IRS for a modest number of IRS elements.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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