通用二进制调制信号的最佳多天线环境后向散射接收机
Optimum Multi-Antenna Ambient Backscatter Receiver for General Binary-Modulated Signal
摘要：
在物联网范式的持续发展中，环境后向散射通信（AmBC）由于能够实现绿色通信而变得越来越流行。由于检测性能受到接收机处信号的低信号干扰噪声比（SINR）的限制，因此已经对反向散射信号检测进行了努力。通过采用多天线接收机可以改善低SINR。在本文中，最佳的多天线接收机，不施加任何约束的类型的二进制调制的后向散射装置和环境源系统所使用的波形进行了研究。所提出的接收机具有由两个波束形成器形成的简单结构。推导了在等幅环境信号和高斯分布环境信号下最优接收机的误比特率性能。此外，为了便于实现的最佳接收机，提出了一种简化的接收机和实际的近似所需的波束形成器提供。推导出的最佳接收机避免了复杂的直达波干扰消除和相干接收，但利用的事实，反向散射信号改变的复合信道撞击在接收机和接收机天线阵列的方向性。比较仿真结果表明，最佳接收机的性能达到相同的性能，即使它实现了非相干接收相干接收。所研究的接收器提供了很高的灵活性，实现简单和低成本的接收器在不同的AmBC系统。
英文摘要：
Ambient backscatter communication (AmBC) is becoming increasingly popular for enabling green communication amidst the continual development of the Internet-of-things paradigm. Efforts have been put into backscatter signal detection as the detection performance is limited by the low signal-to-interference-plus-noise ratio (SINR) of the signal at the receiver. The low SINR can be improved by adopting a multi-antenna receiver. In this paper, the optimum multi-antenna receiver that does not impose any constraints on the types of binary modulation performed by the backscatter device and the waveform used by the ambient source system is studied. The proposed receiver owns a simple structure formed by two beamformers. Bit error rate (BER) performances of the optimum receiver are derived under constant-amplitude ambient signal and Gaussian-distributed ambient signal. Moreover, to facilitate the implementation of the optimum receiver, a simplified receiver is proposed and practical approximations to required beamformers are provided. The derived optimum receiver avoids the complex direct path interference cancellation and coherent reception, but exploits the fact that backscatter signal changes the composite channel impinging at the receiver and the directivity of receiver antenna array. Comparative simulation results show that the performance of the optimum receiver achieves the same performance as the coherent receiver even though it realizes non-coherent reception. The studied receivers provide high flexibility for implementing simple and low-cost receivers in different AmBC systems.
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