Results 71 to 80 of about 2,794,451 (217)

TranQuiL: Long Range Detection and Localization of Interference in Radio Quiet Zones

Radio Science, Volume 61, Issue 1, January 2026.
Abstract Radio Quiet Zones (RQZs) have been established to prevent radio sources from causing harmful interference to sensitive radio telescopes, which study extremely faint cosmic radio waves. Even with strict regulations, such interference is growing due to the widespread use of consumer electronics, emitting in many different frequency bands ...
Atul Bansal, Mohamed Ibrahim, Kuang Yuan, Yiwen Song, Bob Iannucci, Swarun Kumar   +5 more
wiley   +1 more source

A Supervised Learning Method for High‐Performance Channel State Information Estimation

IET Communications, Volume 20, Issue 1, January/December 2026.
This paper proposes a deep neural network (DNN)‐based method for channel state information (CSI) estimation, incorporating a Discrete Fourier Transform (DFT) step to reduce noise impact and improve learning accuracy. Simulation results demonstrate that the proposed method achieves superior channel estimation performance, particularly in noisy wireless ...
Tianle Han, Yongwei Zhang, Murat Temiz
wiley   +1 more source

Orthogonal Frequency Division Multiplexing With Joint Subblocks Index Modulation

IEEE Access, 2019
Recently, orthogonal frequency division multiplexing (OFDM) with index modulation has emerged as promising technologies with the improvement of spectral efficiency and energy efficiency, which carries additional index bits through the index domain.
Yuxin Shi, Kai Gao, Jiang Zhu, Xinjin Lu, Shilian Wang   +4 more
doaj   +1 more source

Acceleration‐Aware Estimation and Compensation of Doppler Scale for Mobile UWA OFDM Systems

IET Communications, Volume 20, Issue 1, January/December 2026.
We propose a novel method to estimate and compensate for the Doppler scale caused by acceleration in orthogonal frequency division multiplexing (OFDM)‐based underwater acoustic (UWA) systems. Simulation results under additive white Gaussian noise (AWGN), synthetic multipath and realistic waymark channel conditions demonstrate that the proposed approach
Yong‐Ho Cho, Seung‐Geun Kim
wiley   +1 more source

Reed-Muller Code-Based Index Codebook Design for Dual-Mode OFDM-IM

IEEE Access
The orthogonal frequency division multiplexing with index modulation (OFDM-IM) is a research topic attracting attention due to its ability to enhance efficiency by carrying additional bits.
Seunggi Choi, Hosung Park
doaj   +1 more source

Hybrid STA With FNN and CNN Models for Robust Channel Estimation in Turbulent FSO and Doppler‐Affected OFDM transmission for LEO Satellite Communication

IET Communications, Volume 20, Issue 1, January/December 2026.
A hybrid framework of deep learning‐based channel estimation for robust communication in free space optical (FSO)‐based low earth orbit (LEO) satellite system using advanced modulation formats for orthogonal frequency division multiplexing (OFDM) transmission. Simulations demonstrate that STA‐ SRCNN and STA‐DNCNN excel in terrestrial FSO channels (NMSE
Saad Rustum, Usman Habib, Salman Ahmed, Muhammad Ahmad, Muhammad Ijaz   +4 more
wiley   +1 more source

ABER Performance of OFDM-IM systems by RIS design in the presence of IQI and α-μ fading

Engineering Science and Technology, an International Journal
Index modulation (IM) techniques are among the competitive candidates for fifth-generation and beyond (5GB) systems, offering new ways of conveying information thanks to their advantages such as structure flexibility and hardware convenience.
Busra Karahan, Ibrahim Develi, Ayse Elif Canbilen, Hussam Alsalameh   +3 more
doaj   +1 more source

A Generalized Bit Error Rate Evaluation for Index Modulation Based OFDM System

IEEE Access, 2020
Orthogonal frequency division multiplexing (OFDM-IM) is a multicarrier transmission technology that modulates information bits not just onto subcarriers by means of M-ary constellation mapping but also onto selected (active) subcarrier indices ...
Mahmoud Abdullahi, Aijun Cao, Adnan Zafar, Pei Xiao, Ibrahim A. Hemadeh   +4 more
doaj   +1 more source

Closed‐Form Approximation of Average Error Probability With Finite‐Blocklength Coding Over Lognormal Wireless Communication Links

IET Communications, Volume 20, Issue 1, January/December 2026.
This work extends the Polyanskiy‐Poor‐Verdu (PPV) framework to lognormal wireless links. Specifically, the paper derives a closed‐form approximation for the average error probability under lognormal distribution, effectively generalizing the PPV analysis beyond the additive white Gaussian noise assumption.
Peng Du, Yuan Zhang
wiley   +1 more source

Slow subcarrier-hopped Space Division Multiple Access OFDM systems

, 2005
Recently Space Division Multiple Access (SDMA) assisted Multi-Input-Multi-Output (MIMO) OFDM systems invoking Multi-User Detection (MUD) techniques have attracted substantial research interests, which are capable of exploiting both transmitter ...
Ng, S.X., Jiang, M., Hanzo, L.
core   +1 more source