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Intelligent Reflecting Surface-Assisted ambient Backscatter Networks: Reflection Design

机译：智能反射表面辅助环境反向散射网络：反射设计

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The uncontrollability of the radio frequency (RF) environment is one of the main obstacles hindering the popularization of ambient backscatter communication devices, because the devices need strong signal to maintain the overhead of backscatter circuits and the reflection of the modulated signals. The intelligent reflector (IRS) can improve the radio frequency environment by adjusting the phase and amplitude of the incident signal, which provides the possibility for the widespread deployment of ambient backscatter communication devices. In this paper, we introduce a novel IRS-assisted ambient backscatter communications system (ABCS), in which the signal of ABCS rides on the signal of the primary system. The two systems share the same receiver, and the signals of the two systems can be demodulated separately based on continuous interference cancellation (SIC) technology. The purpose of this paper is to design the beamforming vector and IRS phase shift jointly to minimize the AP's transmit power while ensuring the quality of service of the ABCS and the primary communication system. Due to the non-convex nature of the problem, the time complexity of solving the problem through exhaustive search will be very high. Therefore, we propose an iterative-based beamforming vector and IRS phase shift joint design method to minimize the AP transmit power. This method can effectively reduce the transmission power of the access point, and the simulation results prove the effectiveness of the method.
机译：射频（RF）环境的不可控制性是妨碍环境反向散射通信设备的推广的主要障碍之一，因为该设备需要强信号来维持反向散射电路的开销和调制信号的反射。智能反射器（IRS）可以通过调整入射信号的相位和幅度来改善射频环境，这提供了广泛部署环境反向散射通信设备的可能性。在本文中，我们介绍了一种新的IRS辅助环境反向散射通信系统（ABC），其中ABCS的信号乘坐主系统的信号。这两个系统共享相同的接收器，并且可以基于连续干扰消除（SIC）技术单独解调两个系统的信号。本文的目的是设计波束成形矢量和IRS相移，以最小化AP的发射功率，同时确保ABCS和主要通信系统的服务质量。由于问题的非凸性质，通过详尽搜索解决问题的时间复杂性将非常高。因此，我们提出了一种基于迭代的波束形成矢量和IRS相移联合设计方法，以最小化AP发射功率。该方法可以有效地降低接入点的传输功率，并且仿真结果证明了该方法的有效性。

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