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

Manchester Encoding for Non-coherent Detection of Ambient Backscatter in Time-Selective Fading