In this paper, we consider a wireless communication system, where a full-duplex hybrid access point (HAP) transmits to a set of cellular users (CUs) in the downlink channel, while receiving data from a set of energy-constrained communication devices like user equipments (UEs) in the uplink channel. The HAP has a massive antenna array, while all CUs and UEs nodes are equipped with single antenna each. Time switching protocol is adopted, where channel estimation, wireless power transfer, and information transfer between UEs, CUs and full-duplex HAP are performed in two phases. By adopting maximum ratio combining/maximum ratio transmission (MRC/MRT) and zero-forcing (ZF) processing at the HAP, the uplink and downlink achievable rate expressions in the large-antenna limit and approximate results that hold for any finite number of antennas are derived. Moreover, the optimum energy beamformer and time-split parameter at the HAP are found to maximize the downlink sum-rate under a constraint on uplink sum-rate. Our findings reveal that our proposed energy beamforming with ZF and MRC/MRT processing for information transfer achieves up to 47% and 14% average sum rate gains as compared with the suboptimum energy beamformer, respectively.

中文翻译：

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基于无线电力传输的全双工大规模天线阵列系统的设计与分析

在本文中，我们考虑了一个无线通信系统，其中全双工混合接入点 (HAP) 向下行链路信道中的一组蜂窝用户 (CU) 发送数据，同时从一组能量受限的通信设备（如上行链路信道中的用户设备（UE）。HAP 拥有庞大的天线阵列，而所有 CU 和 UE 节点都配备了单个天线。采用时间切换协议，其中信道估计、无线功率传输以及UE、CU和全双工HAP之间的信息传输分两个阶段进行。通过在HAP处采用最大比合并/最大比传输（MRC/MRT）和迫零（ZF）处理，上下行链路在大天线限制下可达到的速率表达式以及适用于任何有限数量天线的近似结果是派生的。此外，找到了在 HAP 的最佳能量波束形成器和时间分割参数，以在上行链路总速率的约束下最大化下行链路总速率。我们的研究结果表明，与次优能量波束形成器相比，我们提出的用于信息传输的 ZF 能量波束形成和 MRC/MRT 处理分别实现了高达 47% 和 14% 的平均总速率增益。