KR100605557B1 - Satellite two-way communication system through integration of DVB-S satellite broadcasting technology and broadband CDM wireless communication technology - Google Patents

Abstract

In the present invention, when a terminal receiving a service and a central station (base station) providing a service perform two-way communication using a satellite, a forward link and a reverse link are configured. Adopting the DVB-S and W-CDMA schemes enables the integration of satellite broadcasting technology (DVB-S) and W-CDMA wireless communication technologies, and W-CDMA circuit switching and packets on the W-CDMA reverse link. The present invention relates to a two-way communication system using satellites capable of packet switching communication. The present invention manages users who use a service and processes data transmitted from multiple users in a W-CDMA manner. A central station (base station) for converting desired data into a DVB-S format and transmitting the data to the user through a satellite; A terminal for receiving and processing DVB-S multimedia data transmitted from the central station through the satellite and transmitting W-CDMA transmission data to the satellite when necessary data is implemented.

Description

Bidirectional communication system of satellite using integration of DVB-S satellite broadcasting technology and W-CDMA wireless communication technology}             

1 is a view showing the overall configuration of a satellite bi-directional communication system through the integration of the DV-S satellite broadcasting technology and broadband CDA wireless communication technology according to the present invention,

FIG. 2 is a block diagram showing an embodiment of a central station (base station) of FIG. 1;

3 is a block diagram illustrating an embodiment of the user terminal of FIG. 1.

<Explanation of symbols for the main parts of the drawings>

200 ..... Central Station

201 ..... Web Server

202 ..... Multimedia Stream Server

203 Network Address Translator

205 ..... IP Gateway

206 ..... DVB Modulator

300 ..... Terminal

302 ..... Controls

303 ..... MPEG-2 data processor

310 ..... Receiver

320 ..... Transmitter

322 ..... W-CDMA Modulator

323 ..... Transmit Tuner

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-way communication system using satellites. In particular, the present invention relates to an internet, e-mail, satellite broadcasting reception, video conferencing, moving picture transmission, and other high-speed multimedia services using satellites. The present invention relates to a satellite bi-directional communication system through integration of a DVB-S satellite broadcasting technology and a broadband-CDDMA wireless communication technology.

More specifically, when the terminal receiving the service and the central station (base station) providing the service perform two-way communication using satellite, it is composed of a forward link and a reverse link. By adopting the DVB-S and W-CDMA communication methods, the integration of satellite broadcasting technology (DVB-S) and W-CDMA wireless communication technology is realized, and W-CDMA circuit switching is performed on the W-CDMA reverse link. The present invention relates to a satellite bi-directional communication system through integration of a DVB-S satellite broadcasting technology capable of switching and packet switching communication and a broadband CDM wireless communication technology.

In general, satellite broadcasts are unidirectional, which shows satellite broadcasts to users, but a method of accepting desired data or requests from users has not been implemented.

The two-way satellite broadcasting service currently in service is not strictly referred to as a two-way communication using satellite because the user's request is transmitted through the ground network, not through the satellite.

The satellite bidirectional system, which has been developed and used in the past, has the same communication method from the central station to the user and the user to the central station.

For example, both the forward link and the reverse link use TDMA (Time Division Multiple Access) or FDMA (Frequency Division Multiple Access).

Therefore, since the user terminal is a terminal corresponding to one communication method, a communication service constraint that can be provided is bound to follow. If a communication service is provided by accommodating different communication methods, a plurality of terminals having different communication methods must be provided.

 Therefore, the present invention has been proposed to solve various problems that occur when performing communication using the conventional satellite as described above,

SUMMARY OF THE INVENTION An object of the present invention is to provide a DVB-S satellite broadcasting technology capable of using internet, e-mail, satellite broadcasting reception, video conferencing, moving picture transmission and reception, and other high-speed multimedia services using satellites. The present invention provides a satellite two-way communication system through the integration of broadband CDM wireless communication technology.

More specifically, when the terminal receiving the service and the central station (base station) providing the service perform two-way communication using satellite, it is composed of a forward link and a reverse link. By adopting DVB-S and W-CDMA communication methods, integration of satellite broadcasting technology (DVB-S) and W-CDMA wireless communication technology is realized, and W-CDMA circuit switching on W-CDMA reverse link The present invention is to provide a satellite bidirectional communication system through the integration of DVB-S satellite broadcasting technology and W-CDMA wireless communication technology to enable packet switching communication.

According to the present invention for achieving the above object "satellite bidirectional communication system through the integration of DVB-S satellite broadcasting technology and W-CDMA wireless communication technology",

A central station (base station) which manages users who use the service and processes data transmitted from various users in the W-CDMA manner, converts the data desired by the user into the DVB-S format, and transmits the data to the user through a satellite;

And a terminal for receiving and processing DVB-S multimedia data transmitted from the central station through the satellite, and transmitting W-CDMA transmission data to the satellite when necessary data is requested.

Hereinafter, described in detail with reference to the accompanying drawings, preferred embodiments of the present invention according to the technical spirit as described above.

First, the satellite bidirectional communication system according to the present invention employs a communication method in which the forward link and the reverse link are different. That is, the forward link uses DVB-S (Digital Video Broadcasting via Satellite), and the reverse link uses W-CDMA (Wideband CDMA). In addition, circuit switching and packet switching communication are possible on the W-CDMA reverse link. In addition, the terminal can operate in the embedded format used with the user's PC, and is also implemented in stand alone format to be used alone.

1 is a view showing the overall configuration of a bidirectional communication system using a satellite according to the present invention.

Here, reference numeral 100 denotes a satellite, reference numeral 200 denotes a user who manages a user using a service, processes data transmitted in a W-CDMA manner from various users, and converts the data desired by the user into a DVB-S format. And a center station (base station) for transmitting to the user side through the satellite 100, and reference numeral 300 receives and processes DVB-S multimedia data transmitted from the center station 200 through the satellite 100. And a terminal for transmitting W-CDMA transmission data to the satellite 100 when necessary data is requested.

The operation of the bidirectional communication system using the satellite according to the present invention configured as described above will be described with reference to FIGS. 2 and 3.

2 is a block diagram illustrating an embodiment of the central station 200.

As shown in the figure, a web server 201 constructing a web site for allowing a user to access various multimedia services and a multimedia stream server 202 for generating a multimedia stream for the user are provided. Network address translator (NAT) 203 for translating network addresses to be connected to an external service, and data received from an external network or multimedia stream data generated by the multimedia stream server 202. MPEG-2 DVB-S scheme for converting IP gateway 205 received through Ethernet 204, an internal communication interface, into a format for IP (Internet Protocol) communication, and IP data converted by the IP gateway 205. The DVB modulator 206 modulates the data of the data and the intermediate frequency (IF) signal received from the RF portion. Intermediate Frequency Interface Card Assembly (IFCA) 207 for converting into a signal, and Multi-rate Channel Card Assembly (MCCA) for QPSK demodulation of the digital IF signal converted in the Intermediate Frequency Interface Card Assembly 207 A multi-rate channel card assembly (208), a clock supply unit (HBSC: Hub System Clock) 209 for generating and supplying a required clock in a central station unit based on a clock synchronized with a GPS receiver, and in the central station. An alarm control processor card assembly (ACPA) 210 for collecting alarm signals and reading status information of each unit, the alarm control processor card assembly 210 and a clock supply unit 209. It is connected to and manages the reverse link as a whole, and controls each unit to perform call setup and release, abnormal state management and maintenance functions. Hub Control Processor Card Assembly (HCPA) 211 and the Multi-rate Channel Card Assembly (MCCA) under the control of the Hub Control Processor Card Assembly 211 (MCCA). 208 is configured as a digital unit control card assembly (DDCA) 208 for synchronizing data output from the clock supply unit 209 to the transmitting end via Ethernet 204. .

3 is a block diagram illustrating an embodiment of the terminal 300.

As shown therein, a memory unit 301 which provides a memory area for operating a terminal and a buffer used to process data, and also provides a storage space of an operating system for operating a terminal, and the memory unit ( A control unit 302 connected to the 301 and controls the operation of receiving and processing data transmitted to the forward link through the satellite, and converts the data required by the user into transmission data and transmits the data to the satellite via the reverse link. ), An MPEG-2 data processing unit 303 connected to the control unit 302 to demodulate MPEG-2 data on DVB-S transmitted through a forward link, and connected to the control unit 302 at a maximum of 1 Mbps. A serial communication unit 304 that provides a serial communication interface, an Ethernet 305 that is connected to the control unit 302 to provide a 10 base-T Ethernet interface, and satellite broadcasting. An analog audio / video interface unit 306 that provides an analog video / audio interface, a receiver 310 that processes received data transmitted on a forward link via satellite, and converts data required by a user into transmission data and reverses it. And a transmitter 320 for transmitting to the satellite via a link.

In the reception unit 310, when the DVB-S data of the forward link is received, the reception tuner 311 performs a DVB-S demodulation and QPSK demodulation function, and the signal transmitted from the reception tuner 311 is digital data. Demultiplexing the analog / digital conversion and data error correction unit 312 that converts the digital data to the digital data and corrects the converted digital data, and outputs the data stream output from the analog / digital conversion and data error correction unit 312. The demultiplexer 313 temporarily stores the memory unit 301.

In addition, the transmitter 320 may include a clock providing unit 321 providing a clock for W-CDMA modulation and a clock required for data transmission, and transmitting data according to a clock supplied from the clock providing unit 321. W-CDMA modulator 322 for modulating W-CDMA scheme data, W-CDMA modulator data modulated by W-CDMA modulator 322, QPSK-modulates, modulates into analog signals, L-band direct conversion, And a transmit tuner 323 for performing automatic gain control.

According to the present invention configured as described above, the data transmitted from the central station 200 is transmitted to the terminal 300 via the satellite 100 and the data transmitted from the terminal 300 is transmitted to the central station 200 via the satellite 100. Act as a reverse link transmitted to

First, the operation of the forward link is as follows.

When the user requests the multimedia service after connecting to the central station 200 through the satellite 100, the website through the network address transfer (NAT) 203 under the control of the web server 201 Is connected.

The stream data generated by the multimedia stream server 202 is then transmitted to the IP gateway 205 via the Ethernet 204 for data or multimedia services provided to the user on the website.

The IP gateway 205 receives the multimedia stream data generated by the multimedia stream server 202 or data received from an external network through an Ethernet 204 which is an internal communication interface, and converts the data into a format for IP (Internet Protocol) communication. And convert it to the DVB modulator 206.

The DVB modulator 206 modulates the IP data converted by the IP gateway 205 into MPEG-2 DVB-S data and transmits the data to the satellite 100 through the transmitter.

The forward link signal transmitted as described above is transmitted to the terminal 300 via the satellite 100, and the terminal 300 receives and processes it.

That is, the control unit 302 in the terminal 300 is responsible for the overall control of the receiver 310 when the DVB-S data of the forward link is received through the satellite 100, and in the reception tuner 311 in the receiver 310. The DVB-S demodulation and QPSK demodulation functions are performed and transmitted to the analog / digital conversion and error correction unit 312.

The analog / digital conversion and error correction unit 312 in the receiver 310 converts a signal transmitted from the reception tuner 311 into digital data and corrects an error of the converted data. 313).

The demultiplexer 313 in the receiver 310 demultiplexes the data stream transmitted from the analog / digital conversion and error correction unit 312 and processes the data in the MPEG-2 data processor 303 for processing. Temporarily store demultiplexed data streams.

The controller 302 controls the demultiplexer 311 to transmit the data to the MPEG-2 data processor 303 at a point in time when the user wants the data, and the MPEG-2 data processor 303 receives the received MPEG-. 2 Demodulate the data.

Through this process, data of the forward link is received and processed.

Next, the operation of the reverse link for transmitting data from the terminal 300 to the central station 200 through the satellite 100 is as follows.

First, when the terminal 300 wants to request necessary data through the satellite 100, the transmitter 320 generates and transmits corresponding transmission data under the control of the controller 303.

In more detail, the clock provider 321 in the transmitter 320 generates a clock for W-CDMA modulation and a clock required for data transmission to the W-CDMA modulator 322 and the transmit tuner 323. Each will be provided. That is, the clock provider 321 generates a 32.768 MHz clock and a 10 MHz system clock for data modulation, and supplies the same to each block.

Next, the W-CDMA modulator 322 modulates the transmission data into W-CDMA data according to a clock supplied from the clock provider 321, and the transmission tuner 323 transmits the W-CDMA modulator 322. QPSK modulated W-CDMA modulated data, converts the QPSK modulated digital data into a corresponding analog signal, L-band direct conversion, and auto gain control. After performing the data signal is transmitted to the satellite 100 through the satellite transmitter.

The reverse signal transmitted to the satellite 100 is transmitted to the central station 200 through the satellite 100.

The intermediate frequency interface card assembly 207 of the central station 200 converts the intermediate frequency (IF) signal received from the RF portion into a digital signal corresponding thereto and transmits the converted intermediate frequency (IF) signal to the multi-rate channel card assembly 208.

The multi-rate channel card assembly 208 demodulates the digital IF signal converted by the intermediate frequency interface card assembly 207 to the digital unit control card assembly 208.

On the other hand, the clock supply unit 209 generates the necessary clock in the central station unit based on the clock synchronized to the GPS receiver and supplies to each block, the alarm control processor card assembly 210 is the alarm signal in the central station (alarm) These are collected, and the state information of each unit is read and transmitted to the hub control processor card assembly 211.

The hub control processor card assembly 211 is connected to the alarm control processor card assembly 210 and the clock supply unit 209, operates and manages the reverse link as a whole, and controls each unit to set up, release, and error. It performs status management and maintenance functions.

In addition, the digital unit control card assembly 208 reads data output from the multi-rate channel card assembly (MCCA) 208 under the control of the hub control processor card assembly 211. The clock is supplied to the transmitting end via the Ethernet 204 in synchronization with the clock supplied from the clock supply unit 209.

Since the operations of the web server 201, the multimedia stream server 202, the network address translator 203, the IP gateway 205, the DVB modulator 206, and the like at the transmitting end are the same as those described in the known forward link operation, Detailed description will be omitted.

According to the present invention described above, by using the satellite, the Internet (internet), e-mail (e-mail), satellite broadcasting reception, video conferencing, moving picture transmission and reception and other high-speed multimedia services are possible.

In addition, when the terminal receiving the service and the central station (base station) providing the service communicate with each other using satellite, the satellite broadcasting technology (DVB-S) and the W-CDMA wireless communication technology are integrated. The reverse link has the effect of enabling W-CDMA circuit switching and packet switching communications.

In addition, by allowing the reverse data transmitted from the terminal to be transmitted directly to the central station through the satellite without using the land network, there is an advantage that the two-way communication using the satellite is possible.

Claims (4)

In addition to managing users who use the service through satellites, Network Address Transfer (NAT) is provided to process reverse data transmitted from multiple users in the W-CDMA manner, and the data desired by the user is in DVB-S format. A central station that converts the data to a user side through a satellite; And a terminal for receiving and processing DVB-S multimedia data of a forward link transmitted from the central station through the satellite, and transmitting W-CDMA transmission data of a reverse link to the satellite when necessary data is requested. In the satellite bi-directional communication system through the integration of S satellite broadcasting technology and broadband CDM wireless communication technology, The central station, A web server constructing a web site for allowing a user to access and receive various multimedia services; A multimedia stream server for generating a multimedia stream for the user; An IP gateway which receives the multimedia stream data generated by the multimedia stream server or data transmitted from an external network through Ethernet, an internal communication interface, and converts the multimedia stream data into a format for IP (Internet Protocol) communication; A DVB modulator for modulating the IP data converted by the IP gateway into MPEG-2 DVB-S data; An intermediate frequency interface card assembly (IFCA) for converting an intermediate frequency (IF) signal received from the RF portion into a corresponding digital signal; A multi-rate channel card assembly (MCCA) for QPSK demodulation of the digital IF signal converted in the intermediate frequency interface card assembly; A clock supply unit (HBSC: Hub System Clock) for generating and supplying a required clock in a central station unit based on a clock synchronized with a GPS receiver; An alarm control processor card assembly (ACPA) that collects the alarm signals in the central station and reads state information of each unit; The hub control processor card assembly (HCPA), which is connected to the alarm control processor card assembly and the clock supply unit, operates and manages the reverse link as a whole, and controls each unit to perform call setup and release, abnormal state management, and maintenance functions. A Hub Control Processor card Assembly; Digital transmission of the data output from the multi-rate channel card assembly (MCCA) to the transmitting end via Ethernet in synchronization with the clock supplied from the clock supply unit under the control of the hub control processor card assembly. It consists of a unit control card assembly (DCCA: Digital unit Control Card Assembly), The terminal, A memory unit for providing a memory area for operating the terminal and a buffer used for processing data, and for providing a storage space of an operating system for operating the terminal; It is connected to the memory unit and controls the reception and processing operation of the data transmitted to the DVB-S forward link through the satellite, converts the data required by the user to the transmission data to transmit to the satellite via the W-CDMA reverse link A control unit controlling an operation; An MPEG-2 data processor connected to the controller to demodulate MPEG-2 data on DVB-S transmitted through a DVB-S forward link; A serial communication unit connected to the control unit and providing a serial communication interface of up to 1 Mbps; Ethernet connected to the control unit to provide a 10 base-T Ethernet interface; An analog audio / video interface unit for providing an analog video / audio interface for satellite broadcasting; A receiving unit for processing the received data transmitted on the forward link through the satellite; Integrating the DVB-S satellite broadcasting technology and the broadband CDM wireless communication technology comprising a transmitting unit for converting the data required by the user into the transmission data and transmitting to the satellite via the W-CDMA reverse link Satellite bidirectional communication system. delete delete The method of claim 1, wherein the transmitting unit, A clock providing unit for providing a clock for W-CDMA modulation and a clock for data transmission; A W-CDMA modulator for modulating transmit data into W-CDMA data according to a clock supplied from the clock provider; And a transmit tuner for QPSK modulation of the modulated W-CDMA data in the W-CDMA modulator, converting it into an analog signal, performing L-band direct conversion, automatic gain control, and transmitting the packet. A satellite two-way communication system through the integration of DVB-S satellite broadcasting technology and broadband CDM wireless communication technology.

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