5 papers
Riemannian optimization on the manifold of unitary and symmetric matrices with application to BD-RIS-assisted systems
Ignacio Santamaria, Mohammad Soleymani, Eduard Jorswieck +2
In this paper, we rigorously characterize for the first time the manifold of unitary and symmetric matrices, deriving its tangent space and its geodesics. The resulting parameteriz…
Rate Analysis and Optimization of LoS Beyond Diagonal RIS-assisted MIMO Systems
Ignacio Santamaria, Jesus Gutierrez, Mohammad Soleymani +1
In this letter, we derive an expression for the achievable rate in a multiple-input multiple-output (MIMO) system assisted by a beyond-diagonal reconfigurable intelligent surface (…
Interference Minimization in Beyond-Diagonal RIS-assisted MIMO Interference Channels
Ignacio Santamaria, Mohammad Soleymani, Eduard Jorswieck +1
This paper proposes a two-stage approach for passive and active beamforming in multiple-input multiple-output (MIMO) interference channels (ICs) assisted by a beyond-diagonal recon…
URLLC Networks enabled by STAR-RIS, Rate Splitting, and Multiple Antennas
Eduard Jorswieck, Mohammad Soleymani, Ignacio Santamaria +1
The challenges in dense ultra-reliable low-latency communication networks to deliver the required service to multiple devices are addressed by three main technologies: multiple ant…
MIMO Capacity Maximization with Beyond-Diagonal RIS
Ignacio Santamaria, Mohammad Soleymani, Eduard Jorswieck +1
This paper addresses the problem of maximizing the capacity of a multiple-input multiple-output (MIMO) link assisted by a beyond-diagonal reconfigurable intelligent surface (BD-RIS…