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Coherent Multi-antenna Receiver for BPSK-modulated Ambient Backscatter Tags

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Document pages: 31 pages

Abstract: Ambient Backscatter Communication (AmBC) is an emerging communicationtechnology that can enable green Internet-of-Things deployments. The widespreadacceptance of this paradigm is limited by low Signal-to-Interference-Plus-NoiseRatio (SINR) of the signal impinging on the receiver antenna due to the strongdirect path interference and unknown ambient signal. The adverse impact ofthese two factors can be mitigated by using non-coherent multi-antennareceivers, which is known to require higher SINR to reach Bit-Error-Rate (BER)performance of coherent receivers. However, in literature, coherent receiversfor AmBC systems are little-studied because of unknown ambient signal, unknownlocation of AmBC tags, and varying channel conditions. In this paper, acoherent multi-antenna receiver, which does not require a prior information ofthe ambient signal, for decoding Binary-Phase-shift-Keying (BPSK) modulatedsignal is presented. The performance of the proposed receiver is compared withthe ideal coherent receiver that has a perfect phase information, and also withthe performance of non-coherent receiver, which assumes distributions forambient signal and phase offset caused by excess length of the backscatterpath. Comparative simulation results show the designed receiver can achieve thesame BER-performance of the ideal coherent receiver with 1-dB more SINR, whichcorresponds to 5-dB or more gain with respect to non-coherent reception ofOn-Off-Keying modulated signals. Variation of the detection performance withthe tag location shows that the coverage area is in the close vicinity of thetransmitter and a larger region around the receiver, which is consistent withthe theoretical results.

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