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Optimum Multi-Antenna Ambient Backscatter Receiver for General Binary-Modulated Signal

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Document pages: 29 pages

Abstract: Ambient backscatter communication (AmBC) is becoming increasingly popular forenabling green communication amidst the continual development of theInternet-of-things paradigm. Efforts have been put into backscatter signaldetection as the detection performance is limited by the lowsignal-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 thispaper, the optimum multi-antenna receiver that does not impose any constraintson the types of binary modulation performed by the backscatter device and thewaveform used by the ambient source system is studied. The proposed receiverowns a simple structure formed by two beamformers. Bit error rate (BER)performances of the optimum receiver are derived under constant-amplitudeambient signal and Gaussian-distributed ambient signal. Moreover, to facilitatethe implementation of the optimum receiver, a simplified receiver is proposedand practical approximations to required beamformers are provided. The derivedoptimum receiver avoids the complex direct path interference cancellation andcoherent reception, but exploits the fact that backscatter signal changes thecomposite channel impinging at the receiver and the directivity of receiverantenna array. Comparative simulation results show that the performance of theoptimum receiver achieves the same performance as the coherent receiver eventhough it realizes non-coherent reception. The studied receivers provide highflexibility for implementing simple and low-cost receivers in different AmBCsystems.

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