• Title/Summary/Keyword: satellite TDMA systems

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D-ARP Scheme for Full Mesh Routing in Partial BMA Network (제한적 BMA 네트워크에서 Full Mesh 라우팅을 위한 D-ARP 기법)

  • Kim, Moon
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.25 no.8
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    • pp.1088-1094
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    • 2021
  • This paper proposes a partial BMA (Broadcasting Multiple Access) network structure and D-ARP (Distributed Address Resolution Protocol) method in order to support full mesh routing function in the DAMA (Demand Assigned Multiple Access)-based MF-TDMA (Multi Frequency-Time Division Multiple Access) satellite system. The partial BMA network enables legacy router devices and routing protocols to be adopted in the satellite communication system, and decreases the amount of routing protocol overhead. In addition, we introduce the D-ARP method that help a spoke satellite node acquiring the MAC (Media Access Control) address from remote satellite nodes in none BMA satellite network. The D-ARP method provides the MAC address of remote nodes to each other nodes through the broadcasting-enabled satellite channel. And we lastly evaluate and analysis the network performance of the proposed approach.

An Efficient Rain Fade Countermeasure Technique using Adaptive Modulation in Ka-band Satellite Systems (Ka밴드 위성시스템에서 적응변조방식을 이용한 효과적인 강우 페이딩 보상기술)

  • Hwang, Seong-Hyeon;Choe, Hyeong-Jin;Kim, Hui-Chan
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.37 no.3
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    • pp.18-27
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    • 2000
  • Signal attenuation of Ka-band satellite communication system due to rain fading is more severe than those of conventional frequency band system, thus an efficient rain fade countermeasure technique is absolutely required. In this paper, we design an improved adaptive modulation system, which switches the modulation mode according to the channel condition, and propose the novel synchronization algorithms. We assume that the modulation scheme is M-ary PSK and the receiver is TDMA burst mode. And the transponder model is the same with KOREASAT-3. By using the adaptive modulation scheme, we satisfy the BER and mean spectral efficiency requirements, simultaneously, which is impossible by using the fixed modulation scheme.

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A Robust Recovery Method of Reference Clock against Random Delay Jitter for Satellite Multimedia System (위성 멀티미디어 시스템을 위한 랜덤 지연지터에 강인한 기준 클럭 복원)

  • Kim Won-Ho
    • Journal of the Institute of Convergence Signal Processing
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    • v.6 no.2
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    • pp.95-99
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    • 2005
  • This paper presents an accurate recovery method of the reference clock which is needed for network synchronization in two-way satellite multimedia systems compliant with DVB-RCS specification and which use closed loop method for burst synchronization. In these systems, the remote station transmits TDMA burst via return link. For burst synchronization, it obtains reference clock from program clock reference (PCR) defined by MPEG-2 system specification. The PCR is generated periodically at the hub system by sampling system clock which runs at 27MHz $\pm$ 30ppm. Since the reference clock is recovered by means of digital PLL(DPLL) using imprecise PCR values due to variable random jitter, the recovered clock frequency of remote station doesn't exactly match reference clock of hub station. We propose a robust recovery method of reference clock against random delay jitter The simulation results show that the recovery error is remarkably decreased from 5 clocks to 1 clock of 27MHz relative to the general DPLL recovery method.

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VHF Relay Network for Long Air-to-Ground Communication in Oceanic Flight Routes (대양항로에서 장거리 공대지통신을 위한 VHF Relay Network)

  • Koo, Jayeul
    • Journal of the Korean Society for Aviation and Aeronautics
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    • v.20 no.3
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    • pp.22-27
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    • 2012
  • In oceanic flight routes, HF radio and satellite data links have been used for air-to-ground communication, but these systems have long propagation delay and low data throughput. In this paper, we propose a reliable system to overcome the weakness of current HF radio and satellite communication systems for oceanic aeronautical flight routes. The proposed scheme uses only one aeronautical VHF channel in multi-hop oceanic communication environments and supports a hybrid type of multiple access, which consists of random access and TDMA (Time Division Multiple Access) scheme. The proposed system improves performance on delay and throughput as an effective solution to communicate end-to-end on the oceanic flight routes and strengthens the reliability of oceanic aeronautical communication.

A Study on the Effective Data Transmission for the Remote Monitoring And Control System Using TDM/TDMA

  • Wook, Shin-Gang;Tak, Hong-Sung
    • 제어로봇시스템학회:학술대회논문집
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    • 2001.10a
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    • pp.65.6-65
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    • 2001
  • The satellite communication has been widely applied in the various fields included the remote monitoring and control system through the technical progress. In the star network that is a type of the satellite communication network, users can easily use an earth station because of the large scale and high power of the hub station. This type has many profits which are flexible of network configuration, and can conveniently and inexpensively supply various services which is used in the data acquisition and distribution by important communication means for construction of information society. Using these profits, the satellite communication system is applied to the unmaned remote operation field for the remote control and monitor of the water treatment plants But, ...

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High Power Amplifier Design and Fabrication for Tactical Data Link (전술데이터링크용 고출력증폭기 설계 및 제작)

  • Kim, Jong-Sung;Bae, Moon-Kwan;Kim, Joo-Yeon
    • Journal of IKEEE
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    • v.21 no.4
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    • pp.338-347
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    • 2017
  • This paper describes the design and fabrication of a high power amplifier which is a component of TDL(Tactical Data Link) aircraft terminal. We applied high-speed frequency hopping technology, cognitive radio technology, and receive filter bank technology to efficiently use limited frequency resources with radar and other communication equipment using the same frequency band. The high-power amplifier is physically composed of a transmitter, a receiver, a mechanical part, and a cable assembly, and is designed to meet temperature characteristics and electrical characteristics such as maximum transmission distance and reception sensitivity. Modeling and simulator were used to satisfy the requirement of high power amplifier. The transmit power and the noise figure were measured at 50.02dBm and 2.682dB, respectively. It was confirmed that all the required specifications were satisfied in the electrical characteristics test and the environmental characteristic test.