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Digital satellite communication system and method

A satellite communication system and satellite communication technology, applied in digital satellite communication systems and fields, can solve the problems of not being able to expect to improve the characteristics and performance of communication channels, directly improving "download" quality, and not being able to.

Inactive Publication Date: 2002-07-03
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] As described above, in the conventional digital satellite communication system, since the program of the demodulator, which is an "engine" for performing communication, is not downloaded and updated, it cannot be expected to improve the characteristics and performance of the communication channel
In summary, conventional digital satellite communication systems involve the inconvenience of not being able to improve the quality of "downloads" instantly and directly by themselves

Method used

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  • Digital satellite communication system and method
  • Digital satellite communication system and method

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Embodiment Construction

[0043] Referring now to the drawings, preferred embodiments according to the present invention will be described in detail.

[0044] figure 1 is a schematic block diagram showing an example of a digital satellite communication system according to an embodiment of the present invention. figure 1 The illustrated digital satellite communication system includes a central station (HUB station) 101 , a plurality of VSATs (Very Small Aperture Antenna Terminals) 102 , 103 and 104 , and a communication satellite repeater 107 .

[0045] According to SCPC (Single Carrier Single Channel) of DAMA (Demand Assigned Multiple Access) and FDMA (Frequency Division Multiple Access), communication between HUB station 101 and VSAT (102, 103, 104) is performed through communication satellite repeater 107 Communication with VSAT.

[0046] The HUB station 101 is equipped with a CSC (Common Signaling Channel) communication device 111 . The CSC communication device 111 sends control / monitoring signal...

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Abstract

In a digital satellite communications system for communicating data between a HUB station and a plurality of VSATs (Very Small Aperture Terminals) or between the VSATs via a communications satellite, each VSAT comprises: a digital signal processing section for demodulating signals received by the VSAT; ROM for storing a default program for letting the digital signal processing section execute signal demodulation at start-up of the VSAT; rewritable memory for storing an operation program for letting the digital signal processing section execute signal demodulation after the start-up of the VSAT; an operation program download section for obtaining the operation program by downloading the operation program from the HUB station; an error check / rewriting section for conducting error check to the downloaded operation program until an errorless operation program is obtained by the download and storing the errorless operation program in the rewritable memory; and a switching control section for switching a program which is loaded into and used by the digital signal processing section from the default program to the operation program.

Description

technical field [0001] The present invention relates to a digital satellite communication system and a digital satellite communication method for transmitting between a central station (HUB station) and a plurality of VSATs (Very Small Aperture Antenna Terminals) or between a plurality of VSATs through a communication satellite The data, in particular, relate to a digital satellite communication system and a digital satellite communication method capable of downloading (transmitting, broadcasting) programs from a HUB station to a VSAT. Background technique [0002] A digital satellite communication system generally includes a central station called a "HUB station", multiple VSATs (Very Small Aperture Antenna Terminals), and a communication satellite used as a repeater. The communication between the HUB station and the VSAT and the communication between the VSAT are performed through the communication satellite repeater. The output channel of the common channel (called "CSC"...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/208H04B7/155H04B7/185
CPCH04B7/18528
Inventor 绳田日出
Owner NEC CORP
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