94 citations · 148 across the 14 of their papers we have counts for
14 papers
Correlation Structures and Regime Shifts in Nordic Stock Markets
Maksym A. Girnyk
Financial markets are complex adaptive systems characterized by collective behavior and abrupt regime shifts, particularly during crises. This paper studies time-varying dependenci…
On Broad-Beam Reflection for Dual-Polarized RIS-Assisted MIMO Systems
Parisa Ramezani, Maksym A. Girnyk, Emil Björnson
The use of a reconfigurable intelligent surface (RIS) for aiding user-specific transmission has been widely explored. However, little attention has been devoted to utilizing RIS fo…
Broad Beam Reflection for RIS-Assisted MIMO Systems with Planar Arrays
Parisa Ramezani, Maksym A. Girnyk, Emil Björnson
While reconfigurable intelligent surface (RIS)-aided user-specific beamforming has been vastly investigated, the aspect of utilizing RISs for assisting cell-specific transmission h…
Dual-Polarized Reconfigurable Intelligent Surface Assisted Broad Beamforming
Parisa Ramezani, Maksym A. Girnyk, Emil Björnson
A reconfigurable intelligent surface (RIS) consists of a large number of low-cost elements that can control the propagation environment seen from a transmitter by intelligently app…
Deep-Learning Based Linear Precoding for MIMO Channels with Finite-Alphabet Signaling
Maksym A. Girnyk
This paper studies the problem of linear precoding for multiple-input multiple-output (MIMO) communication channels employing finite-alphabet signaling. Existing solutions typicall…
Efficient Cell-Specific Beamforming for Large Antenna Arrays
Maksym A. Girnyk, Sven O. Petersson
We propose an efficient method for designing broad beams with spatially flat array factor and efficient power utilization for cell-specific coverage in communication systems equipp…
Energy-Efficient Design of Broad Beams for Massive MIMO Systems
Sven O. Petersson, Maksym A. Girnyk
Massive MIMO is a promising air interface technique for 5G wireless communications. Such antennas offers capabilities to utilize channel correlations to create beams suitable for u…
Deep reinforcement learning approach to MIMO precoding problem: Optimality and Robustness
Heunchul Lee, Maksym Girnyk, Jaeseong Jeong
In this paper, we propose a deep reinforcement learning (RL)-based precoding framework that can be used to learn an optimal precoding policy for complex multiple-input multiple-out…
6G White Paper on Machine Learning in Wireless Communication Networks
Samad Ali, Walid Saad, Nandana Rajatheva +24
The focus of this white paper is on machine learning (ML) in wireless communications. 6G wireless communication networks will be the backbone of the digital transformation of socie…
On the Transmit Beamforming for MIMO Wiretap Channels: Large-System Analysis
Maksym A. Girnyk, Frédéric Gabry, Mikko Vehkaperä +2
With the growth of wireless networks, security has become a fundamental issue in wireless communications due to the broadcast nature of these networks. In this work, we consider MI…
On the Optimal Precoding for MIMO Gaussian Wire-Tap Channels
Arash Khabbazibasmenj, Maksym A. Girnyk, Sergiy A. Vorobyov +2
We consider the problem of finding secrecy rate of a multiple-input multiple-output (MIMO) wire-tap channel. A transmitter, a legitimate receiver, and an eavesdropper are all equip…
Asymptotic Performance Analysis of a K-Hop Amplify-and-Forward Relay MIMO Channel
Maksym A. Girnyk, Mikko Vehkaperä, Lars K. Rasmussen
The present paper studies the asymptotic performance of multi-hop amplify-and-forward relay multiple-antenna communication channels. Each multi-antenna terminal in the network ampl…
Asymptotic Analysis of SU-MIMO Channels With Transmitter Noise and Mismatched Joint Decoding
Mikko Vehkaperä, Taneli Riihonen, Maksym A. Girnyk +4
Hardware impairments in radio-frequency components of a wireless system cause unavoidable distortions to transmission that are not captured by the conventional linear channel model…
Large-System Analysis of Correlated MIMO Multiple Access Channels with Arbitrary Signaling in the Presence of Interference
Maksym A. Girnyk, Mikko Vehkaperä, Lars K. Rasmussen
Presence of multiple antennas on both sides of a communication channel promises significant improvements in system throughput and power efficiency. In effect, a new class of large…