Frequency Window with Homogeneous Time of Flight (ToF) for Near Vertical Incidence Skywave (NVIS) Propagation Determined Based on Ionograms
The Multi-Carrier Modulation (MCM) technique in the Near Vertical Incidence Skywave
(NVIS) propagation mode poses a challenge due to the ionosphere's dynamic behavior. The …
(NVIS) propagation mode poses a challenge due to the ionosphere's dynamic behavior. The …
USRP based HF spectrum occupancy measurements at two locations in central and Western Romania
In this paper, measurements of the spectral occupancy in some high frequency (HF) bands
in the Western part of Romania are presented. Signals have been acquisitioned by means of …
in the Western part of Romania are presented. Signals have been acquisitioned by means of …
Man-made Noise Measurement System for HF Band Based on SDR platforms-Design and Implementation
E Sorecau, M Sorecau, N Craiu… - … on Electronics and …, 2022 - ieeexplore.ieee.org
HF radio communications has remained unequivocally a widely debated topic because of its
advantages in providing not only communications over distances of up to thousands of …
advantages in providing not only communications over distances of up to thousands of …
Capacity and reliability of ionosphere communication channel based on multi-carrier modulation technique and LUF-MUF variation
Low capacity and reliability are the challenges in the development of ionosphere
communication channel systems. To overcome this problem, one promising and state-of-the …
communication channel systems. To overcome this problem, one promising and state-of-the …
Markov model for HF spectrum occupancy
C Balint, A De Sabata - 2019 International Symposium on …, 2019 - ieeexplore.ieee.org
Measurement of spectrum occupancy in different frequency bands and spectrum occupancy
data modeling are subject of increased attention given that the whole radio spectrum …
data modeling are subject of increased attention given that the whole radio spectrum …
HF urban noise level in variable channels of 3–24 kHz: A preliminary experimental approach
Lately, there has been a particular interest in increasing the bandwidth of the ionospheric
channel in the high frequency (HF) range. Tests on the use of bandwidths of up to 24kHz …
channel in the high frequency (HF) range. Tests on the use of bandwidths of up to 24kHz …
HF noise measurements based on Software Defined Radio dual receiver and two orthogonal inverted vee antennas
N Craiu, E Sorecau, R Stanca, S Miclaus… - … and Exposition on …, 2020 - ieeexplore.ieee.org
Increasing the data transfer rate in the High Frequency (HF) range involves enlarging the
bandwidth of the channel from the standard value of 3 kHz to values of 6, 12, 24, 48 and …
bandwidth of the channel from the standard value of 3 kHz to values of 6, 12, 24, 48 and …
[PDF][PDF] " Analysis of noise present in ionospheric channels in order to implement efficient waveforms in the HF range
E Șorecău - 2024 - doctorat.utcluj.ro
The critical importance of high-frequency (HF) communications is underscored by its
indispensable role in areas where traditional communications infrastructures are either …
indispensable role in areas where traditional communications infrastructures are either …
A Method Based on Amplitude Probability Density Representation for Sounding High Frequency Noise in Ionospheric Channels
High Frequency (HF) communications efficiency require a precise characterization of the
ionospheric channel's noise. We present a rapid and accurate method to sound the HF …
ionospheric channel's noise. We present a rapid and accurate method to sound the HF …
[PDF][PDF] Software Define Radio system for HF noise measurements
I Bouleanu, VC Vasile - International conference KNOWLEDGE …, 2017 - sciendo.com
Accurate noise estimation in the HF band is a defining aspect in the evaluation of SNR for
communication links. The reference document that specifies how different types of …
communication links. The reference document that specifies how different types of …