论文标题
联合能源收获和信息传输，用于反向散射多源网络中的能量波束成形
Joint Energy Harvest and Information Transfer for Energy Beamforming in Backscatter Multiuser Networks
论文作者
论文摘要
无线驱动的反向散射通信（WPBC）已被确定为低功率通信系统的有前途的技术，可以从能量波束成形以提高能量传递效率的好处。但是，现有的有关能量波束成形的研究未能同时考虑WPBC中的能源供应和信息传输。本文通过考虑能量收集率和可实现的速率之间的限制性关系以及估计的反向散射渠道状态信息（BS-CSI），采取了第一步来填补这一空白。为了确保可靠的沟通和用户公平性，我们通过最大化所有反向散射标签的最低可达到的速率来制定能量波束的设计作为最大值优化问题。我们得出了能量收集速率的封闭形式表达，以及最大比率组合（MRC）和零强度（ZF）接收器的可实现速率的下限。我们的数值结果表明，我们的方案显着胜过最先进的能量波束成形方案。此外，我们计划的可实现速度的速度超过$ 90 \％的$ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $的限制通过横梁成型，则使用Perfect csi为两个接收器而获得。
Wirelessly powered backscatter communication (WPBC) has been identified as a promising technology for low-power communication systems, which can reap the benefits of energy beamforming to improve energy transfer efficiency. However, existing studies on energy beamforming fail to simultaneously take energy supply and information transfer in WPBC into account. This paper takes the first step to fill this gap, by considering the restrictive relationship between the energy harvesting rate and achievable rate with estimated backscatter channel state information (BS-CSI). To ensure reliable communication and user fairness, we formulate the energy beamforming design as a max-min optimization problem by maximizing the minimum achievable rate for all backscatter tags subject to the energy constraint. We derive the closed-form expression of the energy harvesting rate, as well as the lower bound of the achievable rate for maximum-ratio combining (MRC) and zero-forcing (ZF) receivers. Our numerical results indicate that our scheme significantly outperforms state-of-the-art energy beamforming schemes. Additionally, the achievable rate of our scheme approaches more than $90\%$ of the rate limit achieved via beamforming with perfect CSI for both receivers.
