Wireless Information and Power Transfer

3Unified Design of Wireless Information and Power Transmission

Dong In Kim*, Jong Jin Park, Jong Ho Moon, and Kang Yoon Lee

School of Information and Communication Engineering, Sungkyunkwan University (SKKU), Korea

3.1 Introduction

With the growing interest in the Internet‐of‐Things (IoT), massive connection of low‐power IoT/wearable devices is desired for machine‐type communication (MTC), and battery lifetime is becoming a crucial issue for operating IoT networks perpetually [1, 2]. Hence, a fundamental paradigm shift should be launched to develop low‐power transceivers, such as ambient backscatters [3] and LoRa backscatters using chirp spread spectrum (CSS) [4], enabling the vision of low‐power smart devices with ubiquitous connectivity. Furthermore, smart devices may need to be self‐powered for energy neutral operation. Self‐powered smart devices, charged by ambient renewable resources instead of requiring battery replacement, can be deployed to enable low‐power wide area networks (LP‐WAN) for IoT [5]. One promising solution is simultaneous wireless information and power transfer (SWIPT), a technique that transfers both information and power in the air using a radio frequency (RF) signal. Existing SWIPT approaches aim to enhance the rate–energy tradeoff [6, 7] through optimum waveform design for SWIPT on the one hand, and via implementation of appropriate receiver structures on the other hand, at both circuit and system levels.

SWIPT uses a single tone (carrier) with amplitude ...