Finite-Blocklength RIS-Aided Transmit Beamforming

M. Abughalwa, H. D. Tuan, D. N. Nguyen, H. V. Poor, L. Hanzo

Research output: Contribution to journalArticlepeer-review


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, the problem of maximizing the geometric mean (GM) of these rates (GM-rate) and show that this aforementioned results are providing 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, using its execution. The simulations show the merit of our solution.

Original languageEnglish (US)
Pages (from-to)1-6
Number of pages6
JournalIEEE Transactions on Vehicular Technology
StateAccepted/In press - 2022

All Science Journal Classification (ASJC) codes

  • Automotive Engineering
  • Aerospace Engineering
  • Electrical and Electronic Engineering
  • Applied Mathematics


  • Array signal processing
  • Error probability
  • geometric mean maximization
  • nonconvex optimization algorithms
  • Optimization
  • Quality of service
  • Reconfigurable intelligent surface
  • short (finite) blocklength communication
  • Signal to noise ratio
  • Symmetric matrices
  • transmit beamforming
  • trigonometric function optimization
  • Ultra reliable low latency communication


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