Results 41 to 50 of about 62,657 (220)

Multi‐Dimensional Physical‐Layer Security via Digitally Mediated Space–Time Modulation

Advanced Science, EarlyView.
Digitally mediated space–time modulation moves radiation control beyond hardware‐bound switching. Multiple information‐bearing and masking waveforms are jointly synthesized at baseband and coherently coupled to simple periodic time modulation, enabling programmable, independently directed multi‐beam radiation without increasing switching‐state ...
Kejin Chen, Heng Mao, Feng Yang, Gengbo Wu, Lei Zhang, Yikai Chen, Shi‐Wei Qu, Jun Hu, Shiwen Yang   +8 more
wiley   +1 more source

Multiuser MIMO-OFDM for Next-Generation Wireless Systems

, 2007
This overview portrays the 40-year evolution of orthogonal frequency division multiplexing (OFDM) research. The amelioration of powerful multicarrier OFDM arrangements with multiple-input multiple-output (MIMO) systems has numerous benefits, which are ...
Jiang, M, Ming Jiang, Hanzo, L, Lajos Hanzo   +3 more
core   +2 more sources

Terahertz Channel Modeling, Estimation and Localization in RIS‐Assisted Systems

Advanced Electronic Materials, EarlyView.
Reconfigurable intelligent surfaces have become a recent intensive research focus. Based on practical applications, channel strategies for RIS‐assisted terahertz wireless communication systems are categorized into three different types: channel modeling, channel estimation, and channel localization.
Hongjing Wang, Weipeng Wang, Xuan Cong, Shiyu Wang, Gao Li, Sen Gong, Lin Huang, Hongxin Zeng, Yaxin Zhang, Ziqiang Yang   +9 more
wiley   +1 more source

CLEAR Interference Cancellation in a Wideband Dual‐Channel Receiver for Independent Satellite Multi‐Connectivity Links

International Journal of Satellite Communications and Networking, Volume 44, Issue 6, Page 689-699, November/December 2026.
ABSTRACT In this paper, the correlation learning estimation and adaptive reduction (CLEAR) of interference, an adaptive, blind and transparent interference compensation method applied in a wideband dual‐channel receiver, is studied for a pair of independent satellite multi‐connectivity links, using the same carrier frequency and signal bandwidth in use
Svilen Dimitrov
wiley   +1 more source

Estudo da transformada de Walsh-Hadamard aplicada à transmissão OFDM [PDF]

, 2006
Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia Elétrica.Esta dissertação apresenta um estudo da aplicação da Transformada de Walsh-Hadamard (WHT) em diferentes sistemas OFDM ...
Doniak, Marcio Henrique
core  

Complex improvement of the efficiency of radio electronic devices and information transmission systems with OFDM based on nonlinear systems with dynamic chaos

Физика волновых процессов и радиотехнические системы, 2022
This article presents the results of modeling a communication system with OFDM using the methods of scrambling the transmitted signals and masking the transmitted information.
Maxim Yu. Zuev
doaj   +1 more source

Performance Evaluation of PAPR Reduction Scheme for an OTFSM System in 6 G Networks

Applied Research, Volume 5, Issue 5, October 2026.
This article evaluates peak‐to‐average power ratio reduction in OFDM, F‐OFDM, and OTFSM systems using Enhancement Asymmetric Arithmetic Coding (EAAC) for 6 G networks. OTFSM achieves the lowest PAPR values (8.50 dB). EAAC further reduces it to 7.82 dB (8.00% improvement), outperforming the Huffman, Arithmetic, and ANS coding, demonstrating its ...
Noorazlina Mohamid Salih, Siti Maisurah Sulong, Azlina Idris, Wardiah Mohd Dahalan, Izanoordina Ahmad, Mohd Shahrizan Mohd Said   +5 more
wiley   +1 more source

Multiuser MIMO-OFDM Systems using Subcarrier Hopping

, 2006
Recently space division multiple access (SDMA) assisted multiple-input–multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems invoking multiuser detection (MUD) techniques have attracted substantial research interest, which is ...
Jiang, M, Hanzo, L
core   +1 more source

Overcoming the Phase Discontinuity Problem in RIS Optimization: A Robust and Scalable Phase‐Aware Deep Regression Framework via Hybrid CNN–LSTM Architecture

Advanced Intelligent Systems, Volume 8, Issue 9, September 2026.
The phase discontinuity problem—where the cyclic nature of phase angles causes catastrophic errors near the ±π boundary—is a fundamental obstacle in learning‐based reconfigurable intelligent surface (RIS) optimization. A phase‐aware hybrid CNN–LSTM framework resolves this by decomposing phase predictions into sine–cosine components, mapping circular ...
Seda Savaşçı Şen, Ali Çalhan, Murtaza Cicioğlu, Oğuzhan Demiryürek   +3 more
wiley   +1 more source

Study on Analysis of Dispersion for TDM‐GPON System With Different Parameters

Engineering Reports, Volume 8, Issue 8, August 2026.
The workflow and simulated outcomes of a 32‐user bidirectional TDM‐GPON system simulated in OptiSystem 19 to evaluate the effects of optical fiber dispersion under various data rates, fiber lengths, and dispersion levels are shown in the graphical abstract.
Molla Belete Salelgne, Muhabaw Amare Alebachew, Amanuel Asrie Desalegn   +2 more
wiley   +1 more source