Generic Multiuser Coordinated Beamforming for Underlay Spectrum Sharing
Daniel Denkovski, Valentin Rakovic, Vladimir Atanasovski, Liljana, Gavrilovska, Petri M\"ah\"onen

TL;DR
This paper introduces flexible multiuser beamforming algorithms for underlay spectrum sharing that account for primary system interference, supporting arbitrary antennas and users with improved computational efficiency.
Contribution
It develops new recursive convex optimization algorithms for multiuser beamforming that incorporate primary interference and are applicable to various channel types and system configurations.
Findings
Algorithms improve user fairness and sum rate.
Proposed methods handle arbitrary antennas and users.
Complexity reduction enhances convergence and agility.
Abstract
The beamforming techniques have been recently studied as possible enablers for underlay spectrum sharing. The existing beamforming techniques have several common limitations: they are usually system model specific, cannot operate with arbitrary number of transmit/receive antennas, and cannot serve arbitrary number of users. Moreover, the beamforming techniques for underlay spectrum sharing do not consider the interference originating from the incumbent primary system. This work extends the common underlay sharing model by incorporating the interference originating from the incumbent system into generic combined beamforming design that can be applied on interference, broadcast or multiple access channels. The paper proposes two novel multiuser beamforming algorithms for user fairness and sum rate maximization, utilizing newly derived convex optimization problems for transmit and receive…
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Taxonomy
TopicsAdvanced MIMO Systems Optimization · Full-Duplex Wireless Communications · Energy Harvesting in Wireless Networks
