University of Oulu

H. B. Mahmoodi, B. Gouda, M. Salehi and A. Tölli, "Low-complexity Multicast Beamforming for Multi-stream Multi-group Communications," 2021 IEEE Global Communications Conference (GLOBECOM), Madrid, Spain, 2021, pp. 01-06, doi: 10.1109/GLOBECOM46510.2021.9685158.

Low-complexity multicast beamforming for multi-stream multi-group communications

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Author: Bakhshzad Mahmoodi, Hamidreza1; Gouda, Bikshapathi1; Salehi, MohammadJavad1;
Organizations: 1Centre for Wireless Communications, University of Oulu, Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 0.5 MB)
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Language: English
Published: Institute of Electrical and Electronics Engineers, 2021
Publish Date: 2023-03-23


In this paper, assuming multi-antenna transmitter and receivers, we consider a multicast beamformer design for the weighted max-min-fairness (WMMF) problem in a multi-stream multi-group communication setup. Unlike the single-stream scenario, the WMMF objective in this setup is not equivalent to maximizing the minimum weighted SINR due to the summation over the rates of multiple streams. Therefore, the non-convex problem at hand is first approximated with a convex one and then solved using Karush-Kuhn-Tucker (KKT) conditions. Then, a practically appealing closed-form solution is derived for both transmit and receive beamformers as a function of dual variables. Finally, we use an iterative solution based on the sub-gradient method to solve for the mutually coupled and interdependent dual variables. The proposed solution does not rely on generic solvers and does not require any bisection loop for finding the achievable rate of various streams. As a result, it significantly outperforms the state-of-art in terms of computational cost and convergence speed.

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ISBN: 978-1-7281-8104-2
ISBN Print: 978-1-7281-8105-9
Pages: 1 - 6
DOI: 10.1109/GLOBECOM46510.2021.9685158
Host publication: 2021 IEEE Global Communications Conference (GLOBECOM) : Proceedings
Conference: IEEE Global Communications Conference
Type of Publication: A4 Article in conference proceedings
Field of Science: 213 Electronic, automation and communications engineering, electronics
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