scholarly journals Cognitive Interference Cancellation with Digital Channelizer for Satellite Communication

Sensors ◽  
2020 ◽  
Vol 20 (2) ◽  
pp. 355 ◽  
Author(s):  
Byounghak Kim ◽  
Heejung Yu ◽  
Song Noh
Keyword(s):  
Interference Cancellation ◽  
Communication Systems ◽  
Satellite Communication ◽  
Energy Detection ◽  
Detection Performance ◽  
Satellite Networks ◽  
Cognitive Interference ◽  
Research Attention ◽  
Cell Coverage ◽  
Detection Probabilities

The concept of Internet of Things (IoT) has attracted much research attention for the realization of a smart society. However, the radio transmission coverage of the existing IoT solutions is not enough to connect lots of devices deployed over wide areas. Therefore, satellite networks have been considered as one of the most attractive solutions to wide cell coverage of IoT, i.e., global-scaled IoT. In satellite communication, a digital channelizer is one of the most significant parts that support multiple transponders. Owing to their wide coverage, satellite communication systems are more vulnerable to interference than other types of wireless communication systems. In this study, a cognitive interference cancellation using the inherent properties of a digital channelizer is considered. The proposed method detects a subchannel corrupted by interference and omits it. A simple energy detection method and a modified version are proposed for detection of interference. In the modified (i.e., improved) method, the number of required signal blocks to achieve the target detection performance can be reduced, i.e., the detection performance is improved with the same number of blocks, by exploiting the property of the fast Fourier transform (FFT) algorithm. Detection performance such as false alarm and detection probabilities are analyzed, and the validity of the analysis is verified with numerical results. It is also shown that an interference lower than a certain level in the proposed approach does not need to be cancelled.

scholarly journals Introduction to satellite education on quality management

2019 ◽  
Vol 2 (1) ◽  
pp. 1-4
Author(s):  
Paras Jain ◽  
Rishu Agarwal ◽  
Vijya Laxmi Raikwar ◽  
Jaya Khare
Keyword(s):  
Staff Development ◽  
Rural Areas ◽  
Role Models ◽  
Communication Systems ◽  
Satellite Communication ◽  
Educational Opportunity ◽  
Satellite Networks ◽  
Teacher Shortages ◽  
Teacher Student ◽  
Service Training

Education provides access to subject matter experts, interaction with career role models. It provides interaction with students in other schools, increases access to information instructional resources, offers opportunities for staff development/in-service training, and increase school community linkages. The rapid growth of satellite networks has generated interest by many state officials in statewide satellite networks. Rural areas are showing great interest in interactive satellite instruction as a way to resolve teacher shortages and meet rigorous graduation requirements. Televised classes permitting live teacher-student interaction via satellite communication systems, and regular telephone lines provide equity increasing quality of educational opportunity.

scholarly journals BAVP: Blockchain-Based Access Verification Protocol in LEO Constellation Using IBE Keys

2018 ◽  
Vol 2018 ◽  
pp. 1-14 ◽  
Author(s):  
Songjie Wei ◽  
Shuai Li ◽  
Peilong Liu ◽  
Meilin Liu
Keyword(s):  
Key Management ◽  
Satellite Communication ◽  
Satellite Networks ◽  
Frequent User ◽  
Research Attention ◽  
Fast Switching ◽  
Blockchain Technology ◽  
Geo Satellite ◽  
Efficient Access ◽  
Management Schemes

LEO constellation has received intensive research attention in the field of satellite communication. The existing centralized authentication protocols traditionally used for MEO/GEO satellite networks cannot accommodate LEO satellites with frequent user connection switching. This paper proposes a fast and efficient access verification protocol named BAVP by combining identity-based encryption and blockchain technology. Two different key management schemes with IBE and blockchain, respectively, are investigated, which further enhance the authentication reliability and efficiency in LEO constellation. Experiments on OPNET simulation platform evaluate and demonstrate the effectiveness, reliability, and fast-switching efficiency of the proposed protocol. For LEO networks, BAVP surpasses the well-known existing solutions with significant advantages in both performance and scalability which are supported by theoretical analysis and simulation results.

Analysis of the Applicability of Standard Dynamic Routing Protocols in Low Orbit Satellite Networks

2021 ◽  
Vol 8 (4) ◽  
pp. 63-71
Author(s):  
M. Yu. Sorokin ◽  
◽  
V. A. Selifanov ◽  
V. V. Martynenko ◽  
M. A. Frolov ◽  
...  
Keyword(s):  
Communication Networks ◽  
Routing Protocols ◽  
Communication Systems ◽  
Satellite Communication ◽  
Dynamic Routing ◽  
Satellite Networks ◽  
Traffic Routing ◽  
High Resource ◽  
Orbit Satellite ◽  
Resource Requirements

One of the key components of communication networks, which determines the principles of their operation, are traffic routing protocols. The purpose of this article is to consider the possibility of using widely used dynamic routing protocols in LEO satellite communication systems. Based on the available publications, the analysis of the initial data was carried out and the conditions for the functioning of routing protocols in low-orbit satellite communication systems, as well as the basic requirements for such protocols, were formulated. The analysis of the functioning of the dynamic routing protocols in the given conditions is carried out. The disadvantages of the considered protocols are highlighted and characterized. The main conclusion of the article is the inexpediency of using the considered protocols in low-orbit satellite communication networks due to the high resource requirements and the insufficient speed of propagation of changes. The results can be used to substantiate technical solutions in the design of low-orbit satellite communication networks.

INNOVATIVE METHOD OF SATELLITE COMMUNICATION

2019 ◽  
Author(s):  
Teodor Narytnik ◽  
Vladimir Saiko
Keyword(s):  
Communication Systems ◽  
High Speed ◽  
Satellite Communication ◽  
Radio Channel ◽  
Satellite Communications ◽  
Service Area ◽  
Satellite Systems ◽  
Orbit Satellite ◽  
Geometric Size ◽  
Distributed Satellite

The technical aspects of the main promising projects in the segments of medium and low-orbit satellite communication systems are considered, as well as the project of the domestic low-orbit information and telecommunications system using the terahertz range, which is based on the use of satellite platforms of the micro- and nanosatellite class and the distribution of functional blocks of complex satellite payloads more high-end on multiple functionally related satellites. The proposed system of low-orbit satellite communications represents the groupings of low-orbit spacecraft (LEO-system) with the architecture of a "distributed satellite", which include the groupings of the root (leading) satellites and satellite repeaters (slaves). Root satellites are interconnected in a ring network by high-speed links between the satellites. The geometric size of the “distributed satellite” is the area around the root satellite with a radius of about 1 km. The combination of beams, which are formed by the repeater satellites, make up the service area of the LEO system. The requirements for the integrated service area of the LEO system (geographical service area) determine the requirements for the number of distributed satellites in the system as a whole. In the proposed system to reduce mutual interference between the grouping of the root (leading) satellites and repeater satellites (slaves) and, accordingly, minimizing distortions of the information signal when implementing inter-satellite communication, this line (radio channel) was created in an unlicensed frequency (e.g., in the terahertz 140 GHz) range. In addition, it additionally allows you to minimize the size of the antennas of such a broadband channel and simplify the operation of these satellite systems.

Sign in / Sign up

Export Citation Format

Share Document