The Impact of Pulsed RFI on the Coded BER Performance of the Nonlinear Satellite Communication Channel

1981 ◽  
Vol 29 (5) ◽  
pp. 605-620 ◽  
Author(s):  
A. Weinberg
Keyword(s):  
Communication Channel ◽  
Satellite Communication ◽  
The Impact ◽  
Ber Performance

scholarly journals ADS-B Satellite Communication Channel Based on IEEE 802.16 Standard

2017 ◽  
Vol 5 (1) ◽  
pp. 18-27 ◽  
Author(s):  
Volodymir Kharchenko ◽  
Andrii Grekhov ◽  
Vasyl Kondratiuk ◽  
Karina Nagorna
Keyword(s):  
Communication Channel ◽  
Satellite Communication ◽  
Doppler Frequency ◽  
Doppler Frequency Shift ◽  
Ieee 802.16 ◽  
Ground Station ◽  
Time Diversity ◽  
Different Types ◽  
Satellite Ground Station ◽  
The Impact

AbstractOriginal models of “Aircraft-Satellite-Ground Station” communication channel based on IEEE 802.16 standard were built by using MATLAB Simulink. The influence of aircraft transmitter nonlinearity for different types of fading in the channel (Rayleigh and Rician) was studied and the possibility of correcting nonlinearity by using pre-distortion was revealed. The impact of space-time diversity (MISO 2 × 1) for different types of fading in channels was investigated. The effect of the Doppler frequency shift on the operation of communication channels was analyzed.

scholarly journals Model of Satellite Communication Channel Functioning under Conditions of Disturbances of Service Part of Frames by Unsteady Interference

2020 ◽  
Vol 19 (5) ◽  
pp. 967-990
Author(s):  
Andrey Parshutkin ◽  
Dmitriy Buchinskiy
Keyword(s):  
Communication Systems ◽  
Communication Channel ◽  
Noise Immunity ◽  
Satellite Communication ◽  
Block Diagram ◽  
Satellite Communications ◽  
Frame Synchronization ◽  
Code Structure ◽  
Service Information ◽  
The Impact

The paper describes the main ways of organizing modern satellite communication systems and the methods of synchronization and transmission of service information used in them, the frame synchronization mechanism from the view point of noise immunity. Based on the analysis, a block diagram of a simulation model is proposed for studying the influence of unintentional interference on the channels of modern satellite communication systems. The proposed model of the impact of non-stationary interference on a satellite communication channel takes into account the effect of interference on symbolic, frame synchronization, mechanisms for extracting frame boundaries, as well as the effect of modern error correction codes. The model allows evaluating the impact of non-stationary interference on both the information and the service side of the frame of modern systems of broadband satellite communications. As an indicator of the noise immunity of a satellite communication channel, there was used probability of frame loss, i.e. frame skipping due to a violation in the frame synchronization system, incorrect allocation of frame boundaries, or the presence of errors in the frame that were not repaired by corrective codes. Using this model, we studied the effect of non-stationary interference of various durations on the information and service parts of the frame, compared the results of the impact of non-stationary interferences of various durations with the effect of white Gaussian noise. It is shown that non-stationary interference, which are short noise pulses that do not affect the information part of the frame due to reparation by correction codes, can significantly reduce the reception quality due to disruption of frame synchronization and distortion of service information about the signal-code structure and frame length.

What You Say and Where You Say It Matter: Effects of Facebook Message Publicity and Support Type on Evaluation of Support Message Quality

2021 ◽  
pp. 089443932110073
Author(s):  
Yining Malloch ◽  
Bo Feng
Keyword(s):  
Social Support ◽  
Emotional Support ◽  
Communication Channel ◽  
Computer Mediated Communication ◽  
Communication Model ◽  
Mediated Communication ◽  
Message Type ◽  
Computer Mediated ◽  
Tangible Support ◽  
The Impact

Guided by the masspersonal communication model, this study examined the impact of the communication channel (masspersonal vs. interpersonal) and support message type on evaluation of social support message quality in Facebook settings. An online factorial experiment with 480 participants revealed that support messages sent through interpersonal channels (e.g., private messaging) were perceived as higher in quality than those sent through masspersonal channels (e.g., status update). Regardless of channels, participants considered tangible support messages as higher quality than informational and emotional support messages. Implications for computer-mediated communication and social support theories and practices were discussed.

scholarly journals Research on Spatial Channel Model for Vehicle-to-Vehicle Communication Channel in Roadside Scattering Environment

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Xin Chen ◽  
Yong Fang ◽  
Weidong Xiang ◽  
Liang Zhou
Keyword(s):  
Communication Channel ◽  
Channel Model ◽  
Critical Distance ◽  
Traffic Density ◽  
Vehicle Speed ◽  
Angle Of Arrival ◽  
Vehicle To Vehicle ◽  
Proposed Model ◽  
Spatial Channel Model ◽  
The Impact

In this paper, an extension of spatial channel model (SCM) for vehicle-to-vehicle (V2V) communication channel in roadside scattering environment is investigated for the first time theoretically and by simulations. Subsequently, to efficiently describe the roadside scattering environment and reflect the nonstationary properties of V2V channels, the proposed SCM V2V model divides the scattering objects into three categories of clusters according to the location of effective scatterers by introducing critical distance. We derive general expressions for the most important statistical properties of V2V channels, such as channel impulse response, power spectral density, angular power density, autocorrelation function, and Doppler spread of the proposed model. The impact of vehicle speed, traffic density, and angle of departure, angle of arrival, and other statistical performances on the V2V channel model is thoroughly discussed. Numerical simulation results are presented to validate the accuracy and effectiveness of the proposed model.

scholarly journals Optimization of the Return Link Carrier Planning for a Constant Coding and Modulation Satellite Network

2021 ◽  
Vol 2 ◽  
Author(s):  
C. Lacoste ◽  
N. Maturo ◽  
S. Chatzinotas ◽  
L. Emiliani
Keyword(s):  
Bandwidth Allocation ◽  
Satellite Communication ◽  
Service Providers ◽  
Limited Resource ◽  
Satellite Network ◽  
Communication Service ◽  
Implementation Costs ◽  
Core Issue ◽  
The Impact

In this paper, we propose an approach to optimize the frequency plan and associated bandwidth allocation in the return link of a broadband satellite network, by exploring several design techniques for carrier allocation plans. Since bandwidth is a limited resource in satellite telecommunications, the minimization of bandwidth usage is a core issue that satellite communication service providers must solve, in particular for networks using a constant coding and modulation plan, which lacks the flexibility found in newer satellite communication products and can be subject to hardware constraints. This problematic led us to raise the following question: how can the long term bandwidth requirement of the network be minimized, given a set of ground terminals, of Modulations and Codings, and of discrete bandwidths. In this document we formally define the long-term carrier allocation problem and analyze current practical solutions. We subsequently investigate two other potential solutions, found to be more bandwidth-efficient: one based on heuristics and another based on integer linear programming. Finally, we look at the impact of several parameters on the performance of those three methods. Overall we observed marginal reductions in bandwidth, however significant gains were reached for networks with small return links with low committed information rate, a case in which some constant coding and modulation networks could fall. We concluded that those networks could benefit from our methods and see a significant reduction in bandwidth, and subsequently operational costs, at low implementation costs.

scholarly journals Impact of COVID-19 and Coping Policies Implemented by Higher Education Institutions in South-Asian Countries: Systematic Review

2021 ◽  
Vol VI (I) ◽  
pp. 11-23
Author(s):  
Shaheen Fatima ◽  
Nisar Ahmad ◽  
Samreen Fatima
Keyword(s):  
Higher Education ◽  
Systematic Review ◽  
South Asian ◽  
Communication Channel ◽  
Technical Assistance ◽  
Higher Education Institutions ◽  
Asian Countries ◽  
And Coping ◽  
The Impact

COVID-19 has disrupted not only human lives but also the quality of education especially in developing countries of the South- Asian region. This study elaborates the impact of COVID-19 on education sector and also illustrate the strategies followed by the management of Higher Education Institutions (HEIs). The systematic review of 23 most relevant research studies shows that the Pandemic has affected students� learning, mental, physical, social and economical conditions badly. Particularly, students who do not afford the use of technological appliances are suffering more. HEIs need to have a smart online syllabus for various subjects. Furthermore, HEIs need to review their communication channel and technical assistance. The strategies implemented by HEIs during COVID-19 are useful and should be continued to keep offering quality education during upcoming academic sessions.

Sign in / Sign up

Export Citation Format

Share Document