Results 91 to 100 of about 13,357 (238)

User-Centric 5G Cellular Networks: Resource Allocation and Comparison With the Cell-Free Massive MIMO Approach [PDF]

IEEE Transactions on Wireless Communications, 2018
Recently, the so-called cell-free (CF) massive multiple-input multiple-output (MIMO) architecture has been introduced, wherein a very large number of distributed access points (APs) simultaneously and jointly serve a much smaller number of mobile ...
S. Buzzi, C. D’Andrea, Alessio Zappone, C. D'Elia   +3 more
semanticscholar   +1 more source

Max-Min Optimal Beamforming for Cell-Free Massive MIMO

, 2020
This letter develops an optimum beamforming method for downlink transmissions in cell-free massive multiple-input multiple-output (MIMO) systems, which employ a massive number of distributed access points to provide concurrent services to multiple users.
Wu, Jingxian,, Fan, Pingzhi,, Larsson, Erik G,, Zhou, Andong,   +3 more
core   +1 more source

A Joint Channel Modeling, Parameter Estimation and Geometry‐Based Indoor Localization for 5G Systems

Transactions on Emerging Telecommunications Technologies, Volume 37, Issue 6, June 2026.
We propose an end‐to‐end method to accurately localize mobile stations in indoor scenarios, such as those found in Industry 4.0. To this end, we jointly perform wireless channel modeling considering mmWave and MIMO technologies, parameter estimation in 3D, and simple and fine‐grained geometry‐based localization.
Paulo Francisco da Conceição, Rodrigo Pinto Lemos, Flávio Geraldo Coelho Rocha   +2 more
wiley   +1 more source

On the Impact of Hardware Impairments on Massive MIMO

, 2014
Massive multi-user (MU) multiple-input multiple-output (MIMO) systems are one possible key technology for next generation wireless communication systems. Claims have been made that massive MU-MIMO will increase both the radiated energy efficiency as well
Fager, Christian, Svensson, Lars,, Fager, Christian,, Sanchez Perez, Cesar,, Svensson, Lars, Giuseppe Durisi, Durisi, Giuseppe,, Landin, Per,, Per Landin, Eriksson, Thomas, Gustavsson, Ulf,, Thomas Eriksson, Cesar Sanchez-Perez, Sanchez Perez, Cesar, Lars Svensson, Hausmair, Katharina, Gustavsson, Ulf, Christian Fager, Katharina Hausmair, Eriksson, Thomas,, Landin, Per, Durisi, Giuseppe, Hausmair, Katharina,, Fredrik Athley, Sánchez-Pérez, Cesar, Landin, Per N., Ulf Gustavsson, Athley, Fredrik,, Athley, Fredrik   +28 more
core   +1 more source

Performance of Multiuser Downlink Cell-Free Massive MIMO Systems With Hard Deadlines

IEEE Access, 2022
Cell-free massive MIMO (mMIMO) is expected to be a novel network architecture to support massive connections, ultra-high transmission rate, and ultra-reliability low-latency transmission.
Le Tan, Ziyang Zhang, Dongming Wang
doaj   +1 more source

Frozen Differential Scattering in Reconfigurable Complex Media

Laser &Photonics Reviews, Volume 20, Issue 11, 5 June 2026.
A localized perturbation universally results in a rank‐one update of the scattering matrix of any complex medium. The resulting differential output wavefront is “frozen”: its spatial pattern is fixed (agnostic to the input wavefront). Experiments with a programmable‐metasurface‐parametrized wireless link validate frozen differential scattering and ...
Philipp del Hougne
wiley   +1 more source

Symbol‐Level GRAND‐Assisted Detection for Polar‐Coded Spatial Modulation in MIMO Systems

International Journal of Communication Systems, Volume 39, Issue 7, 10 May 2026.
This research presents an integrated polar‐coded spatial modulation (PCSM) transceiver scheme for MIMO transmission over Rayleigh fading channels. The proposed architecture employs linear spatial signal processing for antenna and symbol estimation, followed by symbol‐level guessing random additive noise decoding (symbol‐level GRAND)–assisted detection ...
Abhilasha Gautam, Prabhat Thakur, Ghanshyam Singh   +2 more
wiley   +1 more source

Sum-Rate of Cell Free Massive MIMO Systems With Power Amplifier Non-Linearity

IEEE Access, 2021
Cell free (CF) massive multiple input multiple output (mMIMO) has been suggested as a key solution to meet the high data rate demands of future wireless communications.
Zahra Mokhtari, Rui Dinis
doaj   +1 more source

Millimeter‐Wave Antennas: A Comprehensive State‐of‐the‐Art Review of Design Approaches, Operating Bands, Challenges, and Applications in Body‐Centric and Emerging Systems

Radio Science, Volume 61, Issue 5, May 2026.
Abstract This paper reviews and classifies more than 120 recent contributions on millimeter‐wave (mm‐wave) antennas, with emphasis on their operating bands, design methods, and application domains. It surveys the main mm‐wave frequency ranges and their use in 5G/6G communications, radar and sensing, biomedical and body‐centric systems, imaging, and ...
Sarra Khacha, Chemseddine Zebiri, Mohammad Alibakhshikenari, Djamel Sayad, Issa Elfergani, Muhammad Akmal Chaudhary, Nisar Ahmad Abbasi, Arpan Desai, Jonathan Rodriguez, Takfarinas Saber, Ernesto Limiti   +10 more
wiley   +1 more source

Taxonomy of IMT Interference on Aeronautical Systems

Radio Science, Volume 61, Issue 4, April 2026.
Abstract The rapid deployment of 5G and future 6G networks has raised concerns about interference with critical aeronautical systems, particularly radio altimeters and Wireless Avionics Intra‐Communications (WAIC). This paper offers a comprehensive taxonomy of the 5G/6G signal interference mechanisms, operational impacts, and mitigation strategies in ...
Valéria C. M. N. Leite, Alison Moraes
wiley   +1 more source