Dynamic Range Improvement in Bistatic Backscatter Communication Using Distributed MIMO

TL;DR

This paper presents a novel beamforming algorithm for bistatic backscatter communication with multiple antennas, significantly reducing dynamic range requirements and enhancing detection performance, enabling more practical IoT applications.

Contribution

It introduces a beamforming-based interference suppression method and derives a closed-form detection performance expression for bistatic BSC with multiple antennas.

Findings

Dynamic range is significantly decreased with the proposed algorithm.

Detection performance of the backscatter device is improved.

Simulation confirms the effectiveness of the beamforming approach.

Abstract

Backscatter communication (BSC) is a promising solution for Internet-of-Things (IoT) connections due to its low-complexity, low-cost, and energy-efficient solution for sensors. There are several network infrastructure setups that can be used for BSC with IoT nodes/passive devices. One of them is a bistatic setup where there is a need for high dynamic range and high-resolution analog-to-digital converters at the reader side. In this paper, we investigate a bistatic BSC setup with multiple antennas. We propose a novel algorithm to suppress direct link interference between the carrier emitter (CE) and the reader using beamforming into the nullspace of the CE-reader direct link to decrease the dynamic range of the system and increase the detection performance of the backscatter device (BSD). Further, we derive a Neyman-Pearson (NP) test and an exact closed-form expression for its performance in the detection of the BSD. Finally, simulation results show that the dynamic range of the system is significantly decreased and the detection performance of the BSD is increased by the proposed algorithm compared to a system not using beamforming in the CE, which could then be used in a host of different practical fields such as agriculture, transportation, factories, hospitals, smart cities, and smart homes.