A Markov-Based Satellite-to-Ground Optical Channel Model and Its Effective Coding Scheme

2012 ◽  
Vol E95-B (1) ◽  
pp. 254-262
Author(s):  
Yoshitoshi YAMASHITA ◽  
Eiji OKAMOTO ◽  
Yasunori IWANAMI ◽  
Yozo SHOJI ◽  
Morio TOYOSHIMA ◽  
...  
Keyword(s):  
Channel Model ◽  
Optical Channel ◽  
Coding Scheme

scholarly journals A Molecular Optical Channel Model Based on Phonon-Assisted Energy Transfer Phenomenon

2018 ◽  
Vol 66 (12) ◽  
pp. 6247-6259 ◽  
Author(s):  
Valeria Loscri ◽  
Bige D. Unluturk ◽  
Anna Maria Vegni
Keyword(s):  
Energy Transfer ◽  
Channel Model ◽  
Optical Channel ◽  
Transfer Phenomenon ◽  
Model Based

Differential coding scheme based FSO channel for optical coherent DP-16 QAM transceiver systems

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Shabana Urooj ◽  
Norah Muhammad Alwadai ◽  
Vishal Sorathiya ◽  
Sunil Lavadiya ◽  
Juveriya Parmar ◽  
...  
Keyword(s):  
Simulation Model ◽  
Channel Model ◽  
Optical Signal ◽  
Performance Parameters ◽  
Free Space Optical ◽  
Simulation Performance ◽  
Coding Scheme ◽  
Simulation Results ◽  
Systems Simulation ◽  
Differential Coding

Abstract This article has indicated optical coherent differential polarization (DP) 16 quadrature amplitude modulation (QAM) transceiver systems with free-space optical (FSO) channel in the presence of differential coding scheme. The optical coherent DP 16-QAM receiver executes the reverse process conversion of the optical signal into an electrical one that is detected to the users. The proposed optical coherent DP-16 QAM transceiver systems based FSO channel model with differential coding has been presented and compared with the previous model. However, the simulation results have confidence realization about the superiority of the proposed simulation model. Hence the proposed optical coherent DP-16 QAM transceiver systems simulation model with differential coding is verified and validated the enhancement performance based on simulation performance parameters.

scholarly journals Dual-Branch Pre-Distorted Enhanced ADO-OFDM for Full-Duplex Underwater Optical Wireless Communication System

Photonics ◽  
2021 ◽  
Vol 8 (9) ◽  
pp. 368
Author(s):  
Zixian Wei ◽  
Yibin Li ◽  
Zhaoming Wang ◽  
Junbin Fang ◽  
Hongyan Fu
Keyword(s):  
Wireless Communication ◽  
Spectral Efficiency ◽  
Orthogonal Frequency Division Multiplexing ◽  
Channel Model ◽  
Full Duplex ◽  
Optical Channel ◽  
Optical Wireless Communication ◽  
Optical Wireless ◽  
Hardware Complexity ◽  
Double Gamma Function

In this paper, dual-branch pre-distorted enhanced asymmetrically clipped direct current (DC) biased optical orthogonal frequency division multiplexing (PEADO-OFDM) for underwater optical wireless communication (UOWC) is firstly proposed and simulated. The performances of PEADO-OFDM on the underwater optical channel model (UOCM) are analyzed and further compared with the typical ADO-OFDM. Using the Monte Carlo method for the modeling of UOCM, we adopt a double-gamma function to represent three different water qualities including clear, coastal and harbor waters. The full-duplex architecture enables the removal of Hermitian symmetry (HS) from conventional optical OFDM and can increase the spectral efficiency at the cost of hardware complexity. A new PEADO-OFDM transmitter is also proposed to reduce the complexity of the transmitter. The simulation results exhibit that our proposed dual-branch PEADO-OFDM scheme outperforms the typical ADO-OFDM scheme in spectral efficiency, bit error rate (BER) and stability over the underwater channels of three different water qualities.

scholarly journals A model to estimate performance of space-based quantum communication protocols including quantum key distribution systems

2017 ◽  
Vol 16 (1) ◽  
pp. 5-13
Author(s):  
Jonathan C Denton ◽  
Douglas D Hodson ◽  
Richard G Cobb ◽  
Logan O Mailloux ◽  
Michael R Grimaila ◽  
...  
Keyword(s):  
Quantum Key Distribution ◽  
Distribution Systems ◽  
Quantum Communication ◽  
Channel Model ◽  
Communication Protocols ◽  
Key Distribution ◽  
General Purpose ◽  
Optical Channel ◽  
Use Case ◽  
Atmospheric Conditions

This work presents a model to estimate the performance of space-based, optical-based, quantum communication protocols. This model consists of components to account for optical channel propagation effects based on orbit selection and atmospheric conditions. The model presented is general purpose and can be leveraged to evaluate the performance of a variety of quantum communication protocols, of which, Quantum Key Distribution (QKD) systems served as our motivating use case of particular interest. To verify correctness, the model is used to produce estimates for QKD system scenarios and compared to published results. The performance of QKD systems is of interest as distance limitations for terrestrial-based systems have hindered their practical use, and satellite-based designs that can generate a shared key between two distant geographic locations have been proposed. For this application domain, a review of space-based designs that illuminate the need for a free space downlink channel model is presented followed by its development to estimate the performance of quantum exchanges between a satellite and ground site.

Perceptual coding scheme for ultra-high definition video based on perceptual noise channel model

2021 ◽  
Vol 108 ◽  
pp. 102903
Author(s):  
Xin Cui ◽  
Zongju Peng ◽  
Gangyi Jiang ◽  
Fen Chen ◽  
Mei Yu ◽  
...  
Keyword(s):  
Channel Model ◽  
High Definition ◽  
Perceptual Coding ◽  
Coding Scheme ◽  
High Definition Video

Underwater Wireless Optical Channel Model

2021 ◽  
pp. 147-176
Author(s):  
Yi Lou ◽  
Niaz Ahmed
Keyword(s):  
Channel Model ◽  
Optical Channel

Метод прогнозирования состояния радиоканала 4G и 5G

2019 ◽  
Author(s):  
A.V. Pestryakov ◽  
A.S. Konstantinov
Keyword(s):  
Neural Networks ◽  
Time Series ◽  
Comparative Analysis ◽  
Channel Model ◽  
Radio Channel ◽  
Learning Algorithms ◽  
Base Station ◽  
Coding Scheme ◽  
Lstm Network ◽  
Short Time

The paper presents a developed framework based on several neural networks for predicting the state of a radio channel in order to select the best modulation and coding scheme on the base station, taking into account the fading in the radio channel. Comparative analysis of the efficiency of modern architectures in the prediction of time series is carried out. Neural Long Short Time Memory (LSTM) network is defined as a framework core. The learning algorithms of the architectures under consideration are investigated. The choice of the radio channel model is justified. The framework efficiency is evaluated. Представлен разработанный на основе нескольких нейронных сетей фреймворк для прогнозирования состояния радиоканала с целью выбора наилучшей модуляционно-кодовой схемы на стороне базовой станции (с учетом замираний в нисходящей линии связи). Проведен сравнительный анализ эффективности современных архитектур при прогнозировании временных рядов и определена нейронная сеть LSTM в качестве ядра фреймворка. Исследованы алгоритмы обучения рассма- триваемых архитектур. Обоснован выбор модели радиоканала, параметров и проведена оценка эффективности фреймворка.

TOWARDS AN IMPROVED V-VLC OPTICAL CHANNEL MODELLING

2021 ◽  
Author(s):  
Guillaume Mario Dotreppe ◽  
Jan Coosemans ◽  
Valéry Ann Jacobs
Keyword(s):  
Light Source ◽  
Closed Loop ◽  
Channel Model ◽  
Near Field ◽  
Visible Light Communication ◽  
Numerical Approach ◽  
Optical Channel ◽  
Channel Modelling ◽  
Photometric Distance

Visible Light Communication (VLC) requires better optical channel modelling if it is to be used in vehicular applications. Therefore, the radiation transfer between the transmitter and emitter shall be well defined in all circumstances. An important aspect herein is the determination of the Limiting Photometric Distance (LPD), which characterises the transition between near-field and far-field description of the light source. The LPD allows to determine whether simplified equations can be used in the V-VLC channel model. A first step towards this goal is the analysis of a simple, narrow beam, disk-source with uniform luminance. On-axis, analytical solutions exist. Off-axis, however, no closed loop solutions exist. Therefore, a numerical approach is used, which is validated against on-axis measurements and then expanded to off-axis scenarios. This allows to compute the on- and off-axis LPD of the light source, an important step towards a more accurate description of complex systems for VLC.

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