Finite-Blocklength RIS-Aided Transmit Beamforming

Monir Abughalwa, Hoang D. Tuan, Diep N. Nguyen, H. Vincent Poor, Lajos Hanzo

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


This paper considers the downlink of an ultra-reliable low-latency communication (URLLC) system in which a base station (BS) serves multiple single-antenna users in the short (finite) blocklength (FBL) regime with the assistance of a reconfigurable intelligent surface (RIS). In the FBL regime, the users' achievable rates are complex functions of the beamforming vectors and of the RIS's programmable reflecting elements (PREs). We propose the joint design of the transmit beamformers and PREs to maximize the geometric mean (GM) of these rates (GM-rate) and show that this approach provides fair rate distribution and thus reliable links to all users. A novel computational algorithm is developed, which is based on closed forms to generate improved feasible points. Simulations show the merit of our solution.

Original languageEnglish (US)
Pages (from-to)12374-12379
Number of pages6
JournalIEEE Transactions on Vehicular Technology
Issue number11
StatePublished - Nov 1 2022
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Electrical and Electronic Engineering
  • Computer Networks and Communications
  • Automotive Engineering


  • Geometric mean maximization
  • nonconvex optimization algorithms
  • reconfigurable intelligent surface
  • short (finite) blocklength communication
  • transmit beamforming
  • trigonometric function optimiza- tion


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