The bistatic backscatter is a promising paradigm for the future internet of things network. To tackle the key challenge of strong direct emitter-reader interference, this letter proposes a novel interference cancellation scheme with minimal hardware complexity by exploiting the periodicity of sinusoidal radio frequency (RF) carrier. Based on the interference-free signal, we pursue a detailed investigation on the optimal detector design and characterize its closed-form bit error rate (BER) expression. Also, to demonstrate the superiority of the proposed optimal detector, the popular energy detector is presented to serve as a benchmark. In addition, a simple estimation method is designed to obtain the information of certain parameters required for constructing the thresholds and test statistics. Simulations results demonstrate the superiority of the proposed optimal detector.

中文翻译：

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双基地反向散射通信系统的一种新型干扰消除方案

双基地反向散射是未来物联网网络的一个有前途的范例。为了解决强直接发射器 - 读取器干扰的关键挑战，这封信通过利用正弦射频 (RF) 载波的周期性，提出了一种具有最小硬件复杂性的新型干扰消除方案。基于无干扰信号，我们对最佳检测器设计进行了详细研究，并表征了其封闭形式的误码率 (BER) 表达式。此外，为了证明所提出的最佳检测器的优越性，还提出了流行的能量检测器作为基准。此外，还设计了一种简单的估计方法来获取构建阈值和检验统计量所需的某些参数的信息。