KR20030056110A - Return Channel Satellite Terminal using Personal Computer for DVB-RCS and satellite communication system - Google Patents

Abstract

PURPOSE: A PC-based satellite communication terminal and a satellite communication system using the same are provided to offer a multimedia Internet service by a satellite communication through a PC. CONSTITUTION: A forward link receiving unit(100) demodulates, decodes, and PID(Packet ID)-filters a signal received through a satellite antenna(61). A data processing unit(300) processes a forward link signaling message, a control message, and SNMP(Simple Network Management Protocol) IP(Internet Protocol) packets, which are outputted from the forward link receiving unit(100). An Ethernet interface(400) interfaces data between the data processing unit(300) and a PC(90). A TDMA(Time Division Multiple Access) transmitting and receiving unit(200) converts IP traffic data from the PC(90) and a message outputted from the data processing unit(300) into signals capable of being transmitted to a satellite.

Description

Personal computer-based satellite communication terminal device and a satellite communication system using the same {Return Channel Satellite Terminal using Personal Computer for DVB-RCS and satellite communication system}

The present invention relates to a personal computer-based satellite communication terminal device and a satellite communication system using the same, more specifically, more specifically, a personal computer based to enable a multimedia Internet service by satellite communication through a general personal computer The present invention relates to a satellite communication terminal device and a satellite communication system using the same.

In particular, the present invention provides a personal computer for a multimedia Internet service system under a DVB-RCS (DVB-RCS) system, which is a two-way digital satellite broadcasting system. It relates to a two-way satellite communication support device using.

At present, in order to provide Internet services using satellites, a method using a public telephone network as a reverse return link, a method using a wired cable network, and a method using a wireless subscriber network are mainstream. By providing the necessity, a device for supporting an Internet service in an existing network does not exist.

Summary of the Invention An object of the present invention is to configure a satellite communication system, and includes functions such as demodulation, decoding, and packet identifier (PID) filtering on a received signal, reception control messages, and simple network management. Simple Network Management Protocol (SNMP) Internet Protocol (IP) packet handling, IP packet transmission to users via Ethernet, and users To provide a satellite communication support device having the function of transmitting the IP traffic data from the MAC and the generated MAC (Media Access Control) message as a signal for transmitting to the central station to transmit to the outdoor unit (Out-Door Unit) Is in.

In addition, in implementing such configurations and functions, the basic platform is implemented using a commercial personal computer in consideration of the standardization and scalability of each component hardware, and Linux in consideration of software development and production cost reduction and stability improvement Select (Linux) as your operating system.

1 is a conceptual diagram of a personal computer based satellite communication system according to an embodiment of the present invention;

2 is a block diagram of a personal computer based satellite communication terminal device according to an embodiment of the present invention;

3 is a block diagram of a TDMA transceiver of FIG. 2;

4 is a block diagram of a forward link receiver of FIG. 2;

5 is a data flowchart of a data processor of FIG. 2;

FIG. 6 is a block diagram of an application of the data processing unit to the Linux operating system of FIG. 2.

Satellite communication system using a personal computer according to a feature of the present invention for achieving the above object,

In the system for providing satellite communication using a personal computer,

A satellite providing data communication using wireless;

A central station controlling an overall communication function using the satellite;

And a personal station where a user communicates with the satellite using a personal computer.

The private station,

Personal computer;

A support device for performing a signal matching function and a transmission function between the personal computer and the satellite;

A transmitter for transmitting a signal output from the support apparatus to the satellite, receiving a signal transmitted from the satellite, and outputting the signal to the support apparatus;

A hub that mediates the use of the support device from multiple personal computers.

Personal computer satellite communication support device according to a feature of the present invention for achieving the above object,

An apparatus for supporting a personal computer to enable a communication service through a satellite antenna,

A forward link receiver configured to perform signal processing such as demodulation, decoding, and PID filtering on the signal received through the satellite antenna;

A data processor for processing a forward link signaling message, a control message, and a simple network management protocol IP packet output from the forward link receiving unit;

An Ethernet interface for data matching between the data processor and a personal computer;

And a TDMA (Time Division Multiple Access) transceiver for converting and outputting IP traffic data from a personal computer and a message output from the data processor into a signal transmitted to a satellite.

In the above, the data processing unit,

The driving software of the support apparatus may include a device driver that performs a matching function with a forward link receiver and a TDMA transmitter;

A connection control unit for configuring a bidirectional link with the central station;

An M & C unit for managing the state of the terminal station;

A program controller for controlling each part of the driving software;

It includes a traffic processing unit for transmitting the traffic data and the access control message from the user.

In the above, the forward link receiving unit,

A low noise amplifier for amplifying a signal received through the satellite antenna and outputting an intermediate frequency signal;

A demodulator and an R-S decoder for demodulating and R-S decoding an intermediate frequency signal output from the low noise amplifier and outputting a baseband transport stream signal;

A video overlay processor which receives a transport stream signal output from the demodulator and an R-S decoder, processes an image signal, and outputs the image signal to the data processor;

A demultiplexer and an AV decoder which receives the compressed AV signal output from the video overlay processor, demagnetizes the signal, and decodes the AV signal;

It includes a PCR extraction and correction unit for correcting the signal output from the demodulator and the R-S decoder.

In the above, the TDMA transceiver,

A burst generator for receiving traffic data and signaling data output from the data processor and outputting the data in a predetermined format;

A channel encoder for encoding and outputting a signal output from the burst generator by compensating for distortion and an error in a channel;

A transmission burst processor for converting and outputting a burst signal into which a preamble is inserted and transmitted in the signal output from the channel encoder;

And a modulator for modulating and outputting a signal output from the transmission burst processor into a signal of a time division multiple access method.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

As shown in Figure 1, the satellite communication system using a personal computer according to an embodiment of the present invention,

In the system for providing satellite communication using a personal computer,

Satellite 20 for providing data communication using a wireless;

Central station (10) for controlling the overall communication function using the satellite;

And a personal station 30 for the user to communicate with the satellite using a personal computer.

The private station 30,

A plurality of personal computers 90 using the Internet service;

A support device 70 for performing a signal matching function and a transmission function between the personal computer 90 and the satellite 20;

A transmitting device (60) for transmitting a signal output from the support device (70) to the satellite, receiving a signal transmitted from the satellite, and outputting the signal to the support device (70);

A hub 80 that mediates the use of the support from multiple personal computers.

The support device 70,

A forward link receiver 100 for performing signal processing such as demodulation, decoding, and PID filtering on the signal received through the satellite antenna 61;

A data processor (300) for processing a forward link signaling message, a control message, and a simple network management protocol IP packet output from the forward link receiving unit (100);

An Ethernet interface 400 for data matching between the data processor 300 and the personal computer 90;

And a TDMA transceiver 200 for converting and outputting IP traffic data from the personal computer 90 and a message output from the data processor into a signal for transmission to a satellite.

The forward link receiving unit 100,

A low noise amplifier (110) for amplifying a signal received through the satellite antenna (61) and outputting an intermediate frequency signal;

A demodulator and an R-S decoder (120) for demodulating and R-S decoding an intermediate frequency signal output from the low noise amplifier (110) to output a baseband transport stream signal;

A video overlay processor (130) for receiving a transport stream signal output from the demodulator and the R-S decoder (120), processing an image signal, and outputting the image signal to the data processor;

A demultiplexer and an AV decoder (140) for receiving the compressed AV signal output from the video overlay processor (130), demagnetizing and AV decoding and outputting the compressed AV signal;

PCR extraction and correction unit 160 for correcting the signal output from the demodulator and the R-S decoder.

The TDMA transceiver 200 is,

A burst generator 220 for receiving traffic data and signaling data output from the data processing unit 100 and outputting the data in a predetermined format;

A channel encoder 230 for encoding and outputting a signal output from the burst generator 220 by compensating for distortion and an error in a channel;

A transmission burst processor (240) for converting and outputting a burst signal for inserting and transmitting a preamble into a signal output from the channel encoder (230);

And a modulator 250 for modulating the signal output from the transmission burst processor 240 into a signal of a time division multiple access method.

Operation of the embodiment of the present invention made as described above is as follows.

The satellite 20 provides wireless data communication, and the central station 10 controls the overall communication function using the satellite 20.

Personal station 30 assists a user in communicating with the satellite using a personal computer.

The transmission method of the forward link for transmitting data from the central station 10 to the private station 30 via satellite is DVB-S, and the reverse return link transmission method from the private station 30 to the central station 10 is performed. Is a multi-frequency time division multiple access method (MF-TDMA) which is a standard of the DVB-RCS method.

2, the support device 70 performs a signal matching function and a transmission function between the personal computer 90 and the satellite 20, and the transmission device 60 is output from the support device 70. The signal is transmitted to the satellite, and the signal transmitted from the satellite is received and output to the support device 70.

In addition, the hub 80 performs an arbitration role in data transmission from the support apparatus to the plurality of personal computers.

The forward link receiving unit 100 of the support device 70 performs signal processing such as demodulation, decoding and PID filtering on the signal received through the satellite antenna 61, and the data processing unit 300 outputs the forward link. Processes a forward link signaling message, a control message, and a simple network management protocol IP packet output from the receiver 100.

In addition, the Ethernet interface 400 performs data registration between the data processor 300 and the personal computer 90.

In addition, the TDMA transceiver 200 converts the IP traffic data from the personal computer 90 and the message output from the data processor into a signal transmitted to the satellite and outputs the converted signal.

The low noise amplifier 110 of the forward link receiver 100 amplifies a signal received through the satellite antenna 61 to output an intermediate frequency signal, and the demodulator and RS decoder 120 from the low noise amplifier 110. Demodulate and RS-decode the output intermediate frequency signal to output baseband transport stream signal.

In addition, the video overlay processor 130 receives a transport stream signal output from the demodulator and the R-S decoder 120 to process an image signal and output the image signal to the data processor 300.

The demultiplexer and the AV decoder 140 receive the compressed AV signal output from the video overlay processor 130, demagnetize and AV decode the output signal, and the PCR extraction corrector 160 outputs the demodulator and the RS decoder. Compensate the signal.

As shown in FIG. 3, the burst generator 220 of the TDMA transceiver 200 receives the traffic data and the signaling data output from the data processor 100 and outputs them in a predetermined format.

The channel encoder 230 compensates for the distortion and error in the channel by encoding the signal output from the burst generator 220 and outputs the encoded signal. The transmission burst processor 240 preambles the signal output from the channel encoder 230. Insert it into a burst signal that can be transmitted and output it.

The modulator 250 modulates the signal output from the transmission burst processor 240 into a signal of a time division multiple access method and outputs the modulated signal.

In addition, the operation of each component of the support device 70 maintains the synchronizer, operates at an appropriate time, and transmits data. The provision of the timing and clock necessary for the operation of the synchronizer and the respective components is necessary. The generation unit 210 is made.

In FIG. 4, the forward link receiver 100 is used to provide a subscriber with a high speed internet service, various multimedia services based on IP, and a broadcast reception function.

The forward link receiver 100 maintains the network and operates at an appropriate time, and transmits data. The timing and the clock necessary for the operation of the synchronizer and the respective components are provided by the synchronizer and the clock generator.

Meanwhile, the MPEG2-TS stream received through the forward link receiving unit 100 is converted into a PES stream through a device driver, of which traffic is converted into an IP packet and transferred to the traffic processing process 712 to the user's PC. The control information is transmitted to the access control process and used as information to maintain the bidirectional connection.

The IP packet transmitted from the user to the central station is transferred to the network interface device driver 730 through the traffic processing process 712, and the interface device driver 730 converts the ATM cell into a TDMA transmission module.

The M & C process 520 collects various states of the terminal station to manage the state of the terminal station, and the main process 510 controls the processes so that these processes can be organically operated.

The device driver 310 shown in FIG. 5 registers and operates like a network interface device driver of a Linux kernel portion, such as the TDMA transmitter 200 and the forward receiver 100, to establish a logical interface with hardware. Be in charge.

In addition, the access control process 721 is located in the Network Sub System 720 and plays a role of configuring a bidirectional link with the central station.

The traffic processing process 712 is located in the network system 710 to process IP packets transmitted and received, and the other main processes 510, M & C process 520, and debug process 530 are used in the application sector. Perform a unique function of the process.

In summary, the apparatus for supporting two-way satellite communication using a personal computer of the present invention can be implemented by the following method.

First, the apparatus for supporting bidirectional satellite communication using a personal computer of the present invention includes a forward link receiver 100 which is responsible for signal processing such as demodulation, decoding, PID filtering, etc. on a signal received through a satellite antenna; A data processor (300) for processing access control messages and data IP packets from the forward link receiver; And a TDMA transmitter 200 for transmitting IP traffic data from the personal computer 90 and a message for controlling access from the data processor to the outdoor unit 60.

Second, the data processor 300 includes a device driver 310 for performing a matching function with the forward link receiver 100 and the TDMA transmitter 200; A connection control unit 320 for forming a bidirectional link with the central station; An M & C unit 330 for managing the state of the terminal station; A program controller 340 for controlling each part of the driving software; It consists of a traffic processing unit 350 for transmitting the traffic data and the access control message from the user.

Third, in the Linux operating system, the device driver 310 is located together with the network interface device driver 730 such as the TDMA transmitter interface driver 731 and the forward link receiver interface driver 732 in the Linux operating system. 320 is located together with the network subsystem 720, such as the connection control process 721, traffic processing unit 350 is located in the network system 710, such as the traffic processing process 712, program control unit 340 ), The M & C unit 330, and the debugger unit 390 are located in the application portion 600, such as the main process 510, the M & C process 520, and the debugger process 530.

Accordingly, the present invention operating as described above constitutes a basic platform of reverse communication via satellite based on a personal computer, thereby selecting, designing, and operating an appropriate CPU and other components to support a required function. Problems with operating system selection are solved.

In addition, by adopting Linux as the operating system of the data processing unit, it is possible not only to prevent the increase in cost or delay of development time caused by in-house development by adopting a commercial operating system, but also the stability of the operating system and the willingness to secure development resources. There is an expected effect.

Claims (10)

An apparatus for supporting a personal computer to enable a communication service through a satellite antenna, A forward link receiver configured to perform signal processing such as demodulation, decoding, and PID filtering on the signal received through the satellite antenna; A data processor for processing a forward link signaling message, a control message, and a simple network management protocol IP packet output from the forward link receiving unit; An Ethernet interface for data matching between the data processor and a personal computer; A personal computer based satellite communication terminal including a TDMA (Time Division Multiple Access) transceiver for converting IP traffic data from a personal computer and a message output from the data processor into a signal for transmission to a satellite. The method of claim 1, wherein the data processing unit, The driving software of the support apparatus may include a device driver that performs a matching function with a forward link receiver and a TDMA transmitter; A connection control unit for configuring a bidirectional link with the central station; An M & C unit for managing the state of the terminal station; A program controller for controlling each part of the driving software; Personal computer based satellite communication terminal comprising a traffic processing unit for transmitting traffic data and access control messages from the user. The method of claim 2, wherein the data processing unit, The device driver is located in the network interface device driver of the Linux kernel. The access controller is located in the network subsystem of the Linux kernel. The traffic handler is located in the Linux kernel's network system. The program control unit, the M & C unit, and the debugger unit are personal computer based satellite communication terminals located in the Linux application portion. The method of claim 1, wherein the forward link receiving unit, A low noise amplifier for amplifying a signal received through the satellite antenna and outputting an intermediate frequency signal; A demodulator and an R-S decoder for demodulating and R-S decoding an intermediate frequency signal output from the low noise amplifier and outputting a baseband transport stream signal; A video overlay processor which receives a transport stream signal output from the demodulator and an R-S decoder, processes an image signal, and outputs the image signal to the data processor; A demultiplexer and an AV decoder which receives the compressed AV signal output from the video overlay processor, demagnetizes the signal, and decodes the AV signal; Personal computer-based satellite communication terminal including a PCR extraction and correction unit for correcting the signal output from the demodulator and the R-S decoder. The method of claim 1, wherein the TDMA transceiver, A burst generator for receiving traffic data and signaling data output from the data processor and outputting the data in a predetermined format; A channel encoder for encoding and outputting a signal output from the burst generator by compensating for distortion and an error in a channel; A transmission burst processor for converting and outputting a burst signal into which a preamble is inserted and transmitted in the signal output from the channel encoder; And a modulator for modulating and outputting a signal output from the transmission burst processor into a signal of a time division multiple access method. In the system for providing satellite communication using a personal computer, A satellite providing data communication using wireless; A central station controlling an overall communication function using the satellite; A personal computer based satellite communication system comprising a personal station where a user communicates with the satellite using a personal computer. The method of claim 4, wherein the private station is Personal computer; A support device for performing a signal matching function and a transmission function between the personal computer and the satellite; A transmitter for transmitting a signal output from the support apparatus to the satellite, receiving a signal transmitted from the satellite, and outputting the signal to the support apparatus; A personal computer based satellite communication system comprising a hub that mediates the use of the support device from multiple personal computers. The method of claim 7, wherein the support device, A forward link receiver configured to perform signal processing such as demodulation, decoding, and PID filtering on the signal received through the satellite antenna; A data processor for processing a forward link signaling message, a control message, and a simple network management protocol IP packet output from the forward link receiving unit; An Ethernet interface for data matching between the data processor and a personal computer; A personal computer based satellite communication system comprising a TDMA (Time Division Multiple Access) transmitter and receiver for converting IP traffic data from a personal computer and a message output from the data processor into a signal for transmission to a satellite. The method of claim 8, wherein the forward link receiving unit, A low noise amplifier for amplifying a signal received through the satellite antenna and outputting an intermediate frequency signal; A demodulator and an R-S decoder for demodulating and R-S decoding an intermediate frequency signal output from the low noise amplifier and outputting a baseband transport stream signal; A video overlay processor which receives a transport stream signal output from the demodulator and an R-S decoder, processes an image signal, and outputs the image signal to the data processor; A demultiplexer and an AV decoder which receives the compressed AV signal output from the video overlay processor, demagnetizes the signal, and decodes the AV signal; Personal computer-based satellite communication system including a PCR extraction and correction unit for correcting the signal output from the demodulator and the R-S decoder. The method of claim 8, wherein the TDMA transceiver, A burst generator for receiving traffic data and signaling data output from the data processor and outputting the data in a predetermined format; A channel encoder for encoding and outputting a signal output from the burst generator by compensating for distortion and an error in a channel; A transmission burst processor for converting and outputting a burst signal into which a preamble is inserted and transmitted in the signal output from the channel encoder; And a modulator for modulating and outputting a signal output from the transmission burst processor into a signal of a time division multiple access method.