Results 101 to 110 of about 76,661 (236)
Electronics Letters, 2004 The proposed circuit demodulates 16-QAM I/Q signals over a Gaussian channel INTO data_ds.tmp_pub_log-likelihood ratios (LLRs). The input signals are converted using differential pairs INTO data_ds.tmp_pub_currents which are suitably added/subtracted to produce the values of the LLRs.
F. Seguin +4 more
openaire +1 more source
IET Communications, Volume 20, Issue 1, January/December 2026.The proposed model includes a dual‐stream deep learning architecture which has a 1D convolutional neural network (CNN)‐based spectral encoder and a graph convolutional network (GCN)‐based spatial encoder for extracting the frequency‐domain and node‐topology features. Experimental analysis of the proposed model is performed using the Real‐World Wireless
P. Ramakrishnan +3 more
wiley +1 more source
Deteksi Automatis Skema Modulasi Sinyal OFDM menggunakan Ciri Statistik dan Klasifikasi PSO
Jurnal Elkomika, 2015 ABSTRAKPengenalan format modulasi dari sinyal yang dideteksi merupakan salah satu bahasan penting pada sistem intelligent receiver yang digunakan untuk aplikasi di bidang militer maupun komersial.
AFIEF DIAS PAMBUDI +2 more
doaj +1 more source
Optics Express, 2017 In this work, we proposed two k-means-clustering-based algorithms to mitigate the fiber nonlinearity for 64-quadrature amplitude modulation (64-QAM) signal, the training-sequence assisted k-means algorithm and the blind k-means algorithm.
Junfeng Zhang, Wei Chen, M. Gao, G. Shen
semanticscholar +1 more source
A Generalized Construction of OFDM M-QAM Sequences With Low Peak-to-Average Power Ratio
, 2009 A construction of $2^{2n}$-QAM sequences is given and an upper bound of the peak-to-mean envelope power ratio (PMEPR) is determined. Some former works can be viewed as special cases of this construction.Comment: published by Advances in Mathematics of ...
Feng, Rongquan +2 more
core +1 more source
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 +4 more
wiley +1 more source
Majalah Ilmiah Teknologi Elektro, 2009 Sistem V-BLAST (Vertikal BLAST) merupakan salah satu sistem komunikasi tanpa kabel (wireless) yang dapat meningkatkan kapasitas sistem dengan menggunakan antena pemancar dan penerima yang lebih dari satu, yang dikenal dengan multi elemen antenna.
I Gusti Agung Komang Diafari Djuni Harta
doaj
Optics Express, 2019 In this paper, a two-path parallel scheme for m-QAM-OFDM transmission in optical wireless communications was proposed, and its principle was theoretically derived.
Lu Zhang +5 more
semanticscholar +1 more source
, 2019 Moir\'e superlattices provide a powerful way to engineer properties of electrons and excitons in two-dimensional van der Waals heterostructures. The moir\'e effect can be especially strong for interlayer excitons, where electrons and holes reside in ...
Cain, Jeffrey +13 more
core +2 more sources
Оптимізація демодулятора QAM сигналів
Вісник Національного технічного університету України Київський політехнічний інститут. Серія: Радіотехніка. Радіоапаратобудування, 2014 The processes of signal processing in the quadrature demodulator and the problem of clock synchronization and reference oscillations of quadrature basis providing are considered for a relatively high speed modulation conditions. Main part. The analysis is performed and the basic concepts of the implementation of PLL clock oscillation for optimum ...
Pavlov, O. I., Zaharchenko, O. S.
openaire +3 more sources