Results 41 to 50 of about 49,895 (236)

Investigation of Blanking Nonlinearity in OFDM Systems [PDF]

, 2011
In this paper, we analyze the influence of a blanking nonlinearity onto OFDM systems in detail. We will derive closedform expressions for the signal degradation and the interference, which is introduced by the blanking nonlinearity.
Michael Schnell, Epple, Ulrich, Ulrich Epple, Schnell, Michael, Kamel Shibli, Shibli, Kamel   +5 more
core   +1 more source

Performance evaluation of channel estimation techniques for a mobile fourth generation wide area OFDM system [PDF]

, 2002
In this paper channel estimation techniques for a mobile fourth generation coherent orthogonal frequency division multiplexing (OFDM) system are proposed. Coherent detection dictates that a per-subband estimate of the frequency response of the channel is
Nix, AR, Alex Dowler, Andrew Nix, Angela Doufexi, Dowler, ASH, Doufexi, A   +5 more
core   +1 more source

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

Multiuser MIMO-OFDM for Next-Generation Wireless Systems [PDF]

, 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   +1 more source

Optical distribution of OFDM and impulse-radio UWB in FTTH networks [PDF]

, 2008
Proposal, experimental demonstration and performance comparison of impulse-radio UWB and OFDM UWB distribution in FTTH networks for high-definition audio/video broadcasting is presented.
Marti, Javier, Morant, Maria, J. Marti, Beltran, Marta, T. Alves, M. Beltran, J. Perez, Alves, Tiago, Llorente, Roberto, R. Llorente, Perez Soler, Joaquin, A. Cartaxo, Cartaxo, Adolfo, M. Morant   +13 more
core   +1 more source

Efficient FPGA Implementation of High-Throughput Mixed Radix Multipath Delay Commutator FFT Processor for MIMO-OFDM

Advances in Electrical and Computer Engineering, 2017
This article presents and evaluates pipelined architecture designs for an improved high-frequency Fast Fourier Transform (FFT) processor implemented on Field Programmable Gate Arrays (FPGA) for Multiple Input Multiple Output Orthogonal Frequency ...
DALI, M., GUESSOUM, A., GIBSON, R. M., AMIRA, A., RAMZAN, N.   +4 more
doaj   +1 more source

A Low Complexity Optimal LMMSE Channel Estimator for OFDM System

Journal of Communications Software and Systems, 2021
Linear minimum mean square error (LMMSE) is the optimal channel estimator in the mean square error (MSE) perspective, however, it requires matrix inversion with cubic complexity.
Jyoti P. Patra, Bibhuti Bhusan Pradhan, Poonam Singh   +2 more
doaj   +1 more source

Comparative Analysis of Two-Ray and COST-231 Propagation Models on Point-to-Point Wireless System BER Performance

Journal of Applied Informatics and Computing
This study presents a simulation-based comparative analysis of Two-Ray Ground Reflection and COST-231 Hata propagation models on Bit Error Rate (BER) performance in point-to-point OFDM wireless systems.
Nurhadi Ramadhan, Endah Setyowati
doaj   +1 more source

A way of decreasing the reliability of new OFDM data link

Dianzi Jishu Yingyong, 2021
A new OFDM data link model based on OCML is proposed to solve the problem of reliability of data link of air-to-ground radar. The above model uses OCML spatiotemporal chaotic sequence to improve CCSK soft spread spectrum, and simulates with coding and ...
Su Yuhang, Chen Zhao, Zhai Nuo, Jing Shiqi   +3 more
doaj   +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, EarlyView.
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