Coherent Multi-antenna Receiver for BPSK-modulated Ambient Backscatter Tags
Xiyu Wang, H\"useyin Yi\u{g}itler, Ruifeng Duan, Estifanos Yohannes, Menta, Riku J\"antti

TL;DR
This paper introduces a coherent multi-antenna receiver for BPSK ambient backscatter that does not require prior ambient signal knowledge, achieving near-coherent performance with less SINR than ideal coherent receivers.
Contribution
It presents a novel coherent multi-antenna receiver design for AmBC systems that operates without prior ambient signal information, improving detection performance.
Findings
Achieves same BER as ideal coherent receiver with 1-dB more SINR.
Outperforms non-coherent receiver by 5-dB or more in terms of gain.
Coverage area is near the transmitter and around the receiver, consistent with theoretical predictions.
Abstract
Ambient Backscatter Communication (AmBC) is an emerging communication technology that can enable green Internet-of-Things deployments. The widespread acceptance of this paradigm is limited by low Signal-to-Interference-Plus-Noise Ratio (SINR) of the signal impinging on the receiver antenna due to the strong direct path interference and unknown ambient signal. The adverse impact of these two factors can be mitigated by using non-coherent multi-antenna receivers, which is known to require higher SINR to reach Bit-Error-Rate (BER) performance of coherent receivers. However, in literature, coherent receivers for AmBC systems are little-studied because of unknown ambient signal, unknown location of AmBC tags, and varying channel conditions. In this paper, a coherent multi-antenna receiver, which does not require a prior information of the ambient signal, for decoding…
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Taxonomy
TopicsEnergy Harvesting in Wireless Networks · Full-Duplex Wireless Communications · Antenna Design and Analysis
