6G Green IoT Network: Joint Design of Intelligent Reflective Surface and Ambient Backscatter Communication

Abstract

Ambient backscatter communication (AmBC) is one of the candidate solutions for the 6G green internet of things (IoT) network. However, the uncontrollability of the radio frequency (RF) environment is one of the main obstacles hindering the popularization of AmBC. The intelligent reflective surface (IRS) can improve the radio frequency environment by adjusting the phase and amplitude of the incident signal, which provides the possibility for the widespread deployment of AmBC. Currently, there is no discussion about the joint optimization of AmBC and IRS. In this paper, we introduce a novel IRS and AmBC joint design method. The purpose of this method is to jointly design the beamforming vector, the IRS phase shift, and the reflection coefficient of AmBC to minimize the AP’s transmit power while ensuring the quality of service of the AmBC system and the primary communication system. Due to the nonconvexity of the problem, the time complexity of solving the problem through exhaustive search will be very high. Therefore, we propose a joint design method based on an iterative beamforming vector, IRS phase shift, and reflection coefficient to minimize the AP’s transmit power. This method can effectively reduce the transmission power of the access point (AP), and the simulation results prove the effectiveness of the method.

LoRa Backscatter Network Efficient Data Transmission Using RF Source Range Control

“…Information needed for city management is collected from IoT devices and used to provide intelligent services. For smart-city application, energy-constrained IoT devices are essential, but pose challenges for IoT engineers [1][2][3][4][5].…”

“…IoT devices for smart cities may be located in inaccessible places, and battery replacement may be very difficult or impossible; battery-less communication is thus required. One solution to this is backscatter communication (BackCom); power is delivered by an external radio frequency (RF) source [2,3,6,7] and the devices transmit data. The signal received at the power source is remodulated and reflected, and the information is then transmitted.…”

Hybrid backscatter communication for IoT devices in remote areas

“…Recently, the Internet of Things (IoT) is commonly used in networks, including mobile, computer, and satellite communications. The IoT, or in other words, IoT devices, are used in smart cities for smart applications like traffic, waste management, factories, etc [ [1] , [2] , [3] ]. Intelligent services and options are provided to users with the use of intelligent devices IoT devices used are mainly battery-powered.…”

Data Transmission in Backscatter IoT Networks for Smart City Applications

“…IoT provides various intelligent services using information collected by tiny computing devices. The use of tiny IoT devices is growing rapidly for various services [1][2][3][4][5][6]. These kinds of IoT devices are usually battery powered.…”