Simplifying the detection procedure and improving the bit error rate (BER) performance of a non-coherent receiver in ambient backscatter is vital for enhancing its ability to function without the channel state information (CSI). In this work, we analyze the BER performance of Manchester encoding which is implemented at the transmitter for data transmission, and demonstrate that the optimal decision rule is independent of the system parameters. Further, through extensive numerical results, it is shown that the ambient backscatter system can achieve a signal-to-noise ratio (SNR) gain with Manchester encoding compared to the commonly used uncoded direct on-off keying (OOK) modulation, when used in conjunction with a multi-antenna receiver employing the direct-link cancellation.

中文翻译：

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时间选择性衰落中环境后向散射非相干检测的曼彻斯特编码

简化检测程序并提高非相干接收机在环境反向散射中的误码率 (BER) 性能对于增强其在没有信道状态信息 (CSI) 的情况下运行的能力至关重要。在这项工作中，我们分析了在发送端实现数据传输的曼彻斯特编码的误码率性能，并证明了最优决策规则与系统参数无关。此外，通过大量的数值结果表明，与常用的未编码直接开关键控 (OOK) 调制相比，环境反向散射系统可以通过曼彻斯特编码实现信噪比 (SNR) 增益，当用于与采用直接链路消除的多天线接收器结合使用。