Enhancing ambient backscatter communication utilizing multiple antennas

Abstract

Ambient backscatter communication (AmBC) leverages the existing ambient radio frequency (RF) environment to implement communication with battery-free devices, which has emerged as a promising solution to achieve green communication for future Internet of Things (IoT). The key challenge in the development of AmBC is that the signals backscattered by the AmBC Tag are very weak, while the strong ambient RF signals are unknown and uncontrollable. In this thesis, we investigate utilizing multiple antennas to enhance the AmBC system performance. We first propose the use of orthogonal space-time block codes (OSTBC) by incorporating multiple antennas at the Tag as well as at the Reader. Both coherent and non-coherent OSTBC are considered, and an accurate approximate linearized and normalized mu...[ Read more ]