64 citations · 102 across the 31 of their papers we have counts for
7 papers · 1 filter
A Novel Discrete Phase Shift Design for RIS-Assisted Multi-User MIMO
Parisa Ramezani, Yasaman Khorsandmanesh, Emil Björnson
Reconfigurable intelligent surface (RIS) is a newly-emerged technology that might fundamentally change how wireless networks are operated. Though extensively studied in recent year…
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…
Parametric Channel Estimation with Short Pilots in RIS-Assisted Near- and Far-Field Communications
Mehdi Haghshenas, Parisa Ramezani, Maurizio Magarini +1
Considering the dimensionality of a typical reconfigurable intelligent surface (RIS), channel state information acquisition in RIS-assisted systems requires lengthy pilot transmiss…
Exploiting the Depth and Angular Domains for Massive Near-Field Spatial Multiplexing
Parisa Ramezani, Alva Kosasih, Amna Irshad +1
In this article, we present our vision for how extremely large aperture arrays (ELAAs), equipped with hundreds or thousands of antennas, can play a major role in future 6G networks…
A New Channel Subspace Characterization for Channel Estimation in RIS-Aided Communications
Mehdi Haghshenas, Parisa Ramezani, Maurizio Magarini +1
A reconfigurable intelligent surface (RIS) is a holographic MIMO surface composed of a large number of passive elements that can induce adjustable phase shifts to the impinging wav…
Efficient LOS Channel Estimation for RIS-Aided Communications Under Non-Stationary Mobility
Mehdi Haghshenas, Parisa Ramezani, Emil Björnson
Reconfigurable intelligent surface (RIS) is a newly-emerged technology that, with its unique features, is considered to be a game changer for future wireless networks. Channel esti…