Interference-Free Transceiver Design and Signal Detection for Ambient Backscatter Communication Systems over Frequency-Selective Channels

TL;DR

This paper introduces an interference-free transceiver design for ambient backscatter communication over frequency-selective channels, utilizing OFDM cyclic prefix to improve detection accuracy without disrupting existing systems.

Contribution

It proposes a novel transceiver design that cancels interference using OFDM cyclic prefix and develops a maximum likelihood detector with detection thresholds.

Findings

Enhanced detection accuracy demonstrated through simulations

Interference-free operation compatible with existing OFDM systems

Effective maximum likelihood detection method developed

Abstract

In this letter, we study the ambient backscatter communication systems over frequency-selective channels. Specifically, we propose an interference-free transceiver design to facilitate signal detection at the reader. Our design utilizes the cyclic prefix (CP) of orthogonal frequency-division multiplexing (OFDM) source symbols, which can cancel the signal interference and thus enhance the detection accuracy at the reader. Meanwhile, our design results in no interference on the existing OFDM communication systems. We also suggest a maximum likelihood (ML) detector for the reader and derive two detection thresholds. Simulations are then provided to corroborate our proposed studies.