Results 21 to 30 of about 49,792 (241)

ADAPTIVE CYCLIC PREFIX LENGTH FOR CONVOLUITIONAL CODE OFDM SYSTEM IN FREQUENCY SELECTIVE CHANNEL

open access: yesJournal of Engineering, 2023
Orthogonal Frequency Division Multiplexing (OFDM) is one of recent years multicarrier modulation used in order to combat the Inter Symbol Interference (ISI) introduced by frequency selective mobile radio channel.
Ashwaq A. Abed Aljanaby   +1 more
doaj   +1 more source

Orthogonal Time-Frequency Multiplexing With 2D Hermitian Symmetry for Optical-Wireless Communications

open access: yesIEEE Photonics Journal, 2020
Orthogonal time-frequency-space (OTFS) modulation is a promising two-dimensional (2D) signal technique to tackle high mobility time-varying wireless channels.
Jie Zhong   +3 more
doaj   +1 more source

Parallel-Interference-Cancellation-Assisted Decision-Directed Channel Estimation for OFDM Systems using Multiple Transmit Antennas [PDF]

open access: yes, 2005
The number of transmit antennas that can be employed in the context of least-squares (LS) channel estimation contrived for orthogonal frequency division multiplexing (OFDM) systems employing multiple transmit antennas is limited by the ratio of the ...
Hanzo, L., Munster, M.
core   +1 more source

Comparison of traffic performance of QPSK and 16-QAM modulation techniques for OFDM system

open access: yesJournal of Telecommunications and Information Technology, 2005
Orthogonal frequency division multiplexing (OFDM) provides better spectral efficiency than frequency division multiplexing (FDM), while maintaining orthogonal relation between carriers; hence traffic is better carried by OFDM than FDM within the same ...
Imdadul Islam, Siddique Hossain
doaj   +1 more source

An evaluation of the performance of IEEE 802.11a and 802.11g wireless local area networks in a corporate office environment [PDF]

open access: yes, 2003
In recent years there has been considerable interest in the development of standards for wireless local area networks. In particular, IEEE's 802.11a and 802.11g both employ coded orthogonal frequency division multiplexing (COFDM) but operate in different
Armour, SMD   +4 more
core   +2 more sources

Orthogonal Frequency Division Multiplexing With Joint Subblocks Index Modulation

open access: yesIEEE 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   +4 more
doaj   +1 more source

Soft-Information Assisted Near-Optimum Nonlinear Detection for BLAST-type Space Division Multiplexing OFDM Systems

open access: yes, 2007
In this contribution, a nonlinear hybrid detection scheme based on a novel soft-information assisted Genetic Algorithm (GA) is proposed for a Turbo Convolutional (TC) coded Space Division Multiplexing (SDM) aided Orthogonal Frequency Division ...
Akhtman, Jos, Hanzo, Lajos, Jiang, Ming
core   +1 more source

Performance analysis of modified asymmetrically-clipped optical orthogonal frequency-division multiplexing systems [PDF]

open access: yes, 2016
A modification to the Asymmetrically-Clipped Optical Orthogonal Frequency-Division Multiplexing (ACO-OFDM) technique is proposed through unipolar encoding.
Andonovic, Ivan   +3 more
core   +1 more source

Space-Time Multiple-Mode Orthogonal Frequency Division Multiplexing With Index Modulation

open access: yesIEEE Access, 2017
Multiple-mode orthogonal frequency division multiplexing with index modulation (MM-OFDM-IM) improves the spectral efficiency of the conventional OFDM-IM scheme by considering multiple distinguishable constellations for signal modulation.
Jun Li   +3 more
doaj   +1 more source

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