Symbiotic Radio: A New Communication Paradigm for Passive Internet of Things

In this article, a symbiotic radio (SR) system is proposed to support passive Internet of Things (IoT), in which a backscatter device (BD), also called IoT device, is parasitic in a primary transmission. The primary transmitter (PT) is designed to assist both the primary and BD transmissions, and th...

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Bibliographic Details
Published in:IEEE internet of things journal 2020-02, Vol.7 (2), p.1350-1363
Main Authors: Long, Ruizhe, Liang, Ying-Chang, Guo, Huayan, Yang, Gang, Zhang, Rui
Format: Article
Language:English
Subjects:
Array signal processing
Backscatter
Backscatter communications
Backscattering
Beamforming
Channel estimation
Computer simulation
Internet of Things
Optimization
Parasitic elements (antennas)
Radio frequency
Receivers
Symbiosis
symbiotic radio
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Summary:In this article, a symbiotic radio (SR) system is proposed to support passive Internet of Things (IoT), in which a backscatter device (BD), also called IoT device, is parasitic in a primary transmission. The primary transmitter (PT) is designed to assist both the primary and BD transmissions, and the primary receiver (PR) is used to decode the information from the PT as well as the BD. The symbol period for BD transmission is assumed to be either equal to or much greater than that of the primary one, resulting in parasitic SR (PSR) or commensal SR (CSR) setup. We consider a basic SR system which consists of three nodes: 1) a multiantenna PT; 2) a single-antenna BD; and 3) a single-antenna PR. We first derive the achievable rates for the primary and BD transmissions for each setup. Then, we formulate two transmit beamforming optimization problems, i.e., the weighted sum-rate maximization (WSRM) problem and the transmit power minimization (TPM) problem, and solve these nonconvex problems by applying the semidefinite relaxation (SDR) technique. In addition, a novel transmit beamforming structure is proposed to reduce the computational complexity of the solutions. The simulation results show that for CSR setup, the proposed solution enables the opportunistic transmission for the BD via energy-efficient passive backscattering without any loss in spectral efficiency, by properly exploiting the additional signal path from the BD.
ISSN:2327-4662
2327-4662
DOI:10.1109/JIOT.2019.2954678