no code implementations • 12 Feb 2024 • Parisa Ramezani, Özlem Tuğfe Demir, Emil Björnson
Source localization is the process of estimating the location of signal sources based on the signals received at different antennas of an antenna array.
no code implementations • 9 Dec 2023 • Parisa Ramezani, Yasaman Khorsandmanesh, Emil Björnson
Reconfigurable intelligent surface (RIS) is a newly-emerged technology that might fundamentally change how wireless networks are operated.
no code implementations • 1 Dec 2023 • 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 has been largely unattended.
no code implementations • 12 Nov 2023 • 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 applying phase shifts to impinging signals before reflection.
no code implementations • 21 Aug 2023 • Mehdi Haghshenas, Parisa Ramezani, Maurizio Magarini, Emil Björnson
This paper proposes a parametric maximum likelihood estimation (MLE) framework for jointly estimating the direct channel between the user and the base station (BS) and the line-of-sight channel between the user and the RIS, in both far-field and near-field scenarios.
no code implementations • 5 Jul 2023 • Parisa Ramezani, Alva Kosasih, Amna Irshad, Emil Björnson
This article presents the foundational properties of communication in the radiative near-field region and then exemplifies how these properties enable two unprecedented spatial multiplexing schemes: depth-domain multiplexing of multiple users and angular multiplexing of data streams to a single user.
no code implementations • 4 Apr 2023 • Mehdi Haghshenas, Parisa Ramezani, Maurizio Magarini, Emil Björnson
Reaping the benefits of RIS, however, relies on the accuracy of the channel estimation, which is a challenging task due to the large number of RIS elements.
no code implementations • 29 Mar 2023 • 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.
no code implementations • 7 Apr 2020 • Bin Lyu, Parisa Ramezani, Dinh Thai Hoang, Shimin Gong, Zhen Yang, Abbas Jamalipour
We propose time-switching (TS) and power-splitting (PS) schemes for the IRS, where the IRS can harvest energy from the HAP's signals by switching between energy harvesting and signal reflection in the TS scheme or adjusting its reflection amplitude in the PS scheme.
