Backscatter Communication for Wireless-Powered Communication Networks

Abstract

In this paper, we introduce backscatter communication for power-limited sensors to enable long-range transmission in wireless sensor networks, and envision a way to avoid doubly near-far problem in wireless-powered communication network (WPCN) with this technology. In backscatter based WPCN, users harvest energy from both the signal broadcasted by the hybrid access point and the carrier signal transmitted by the carrier emitter in the downlink, and then transmit their own information in a passive way via the reflection of the carrier signal using frequency-shift keying modulation in the uplink. We characterize the energy-free condition and the signal-to-noise ratio (SNR) outage zone in backscatter based WPCN. Further, we propose backscatter based harvest-then-transmit protocol to maximize the sum-throughput of the backscatter based WPCN by optimally allocating time for energy harvesting and information transmission. Numerical results demonstrate that the backscatter based WPCN increases significantly the transmission range and diminishes greatly the SNR outage zone 논문 15-40-10-05

Energy Outage Probability and Achievable Throughput of 2-Channel Sensing Secondary Users in RF Powered Cognitive Radio Networks

“…저전 력 무선 센서 노드들로 구성된 사물 인터넷 (Internet of Things; IoT) 환경이나 무선 센서 네트워크에서 RF 무선 충전 기술을 적용하여 센서 노드들의 배터리 수 명을 연장할 수 있으며, 이와 같은 RF 무선 충전 기술 의 응용을 위한 테스트베드가 구현되었다 [4,5] . 또한 저 전력 센서 노드들의 원거리 통신을 위해 Backscatter 통신을 접목한 RF 무선 충전 통신 네트워크에 대한 연구도 진행되었다 [6] . 기술이 제안되었다 [7] .…”