Resource Allocations for Symbiotic Radio with Finite Blocklength Backscatter Link

Zheng Chu, Wanming Hao, Pei Xiao, Mohsen Khalily, Rahim Tafazolli

Research output: Journal PublicationArticlepeer-review

25 Citations (Scopus)


This article exploits a generic downlink symbiotic radio (SR) system, where a base station (BS) establishes a direct (primary) link with a receiver having an integrated backscatter device (BD). In order to accurately measure the backscatter link, the backscattered signal packets are designed to have finite block length. As such, the backscatter link in this SR system employs the finite blocklength channel codes. According to different types of the backscatter symbol period and transmission rate, we investigate the noncooperative and cooperative SR systems, and derive their average achievable rate of the direct and backscatter links, respectively. We formulate two optimization problems, i.e., transmit power minimization and energy-efficiency maximization. Due to the nonconvex property of these formulated optimization problems, the semidefinite programming (SDP) relaxation and the successive convex approximation (SCA) are considered to design the transmit beamforming vector. Moreover, a low-complexity transmit beamforming structure is constructed to reduce the computational complexity of the SDP relaxed solution. Finally, the simulation results are demonstrated to validate the proposed schemes.

Original languageEnglish
Article number9036977
Pages (from-to)8192-8207
Number of pages16
JournalIEEE Internet of Things Journal
Issue number9
Publication statusPublished - Sept 2020
Externally publishedYes


  • Backscatter
  • finite blocklength channel codes
  • semidefinite programming (SDP)
  • successive convex approximation (SCA)
  • symbiotic radio (SR)

ASJC Scopus subject areas

  • Signal Processing
  • Information Systems
  • Hardware and Architecture
  • Computer Science Applications
  • Computer Networks and Communications


Dive into the research topics of 'Resource Allocations for Symbiotic Radio with Finite Blocklength Backscatter Link'. Together they form a unique fingerprint.

Cite this