Apparatus for transmitting and receiving MPEG data by using wireless LAN

• US 6,925,285 B2
• Filed: 09/25/2002
• Issued: 08/02/2005
• Est. Priority Date: 09/28/2001
• Status: Expired due to Fees

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Jae-Geun
• Primary Examiner(s): Corsaro, Nick
• Assistant Examiner(s): Nguyen, Tu X
• Application Number:
  US10/254,409
• Publication Number:
  US 20030064679A1
• Time in Patent Office: 1,042 Days
• Field of Search: 455/3.02, 455/7, 455/426.2, 455/427, 455/41.2, 725/62, 725/63, 725/74, 725/71, 725/135, 725/138, 725/139, 725/131, 370/279
• US Class Current: 455/3.02
• CPC Class Codes: H03M 13/1515 Reed-Solomon codes
• CPC Class Codes: H03M 13/155 Shortening or extension of codes
• CPC Class Codes: H04H 40/90 specially adapted for satellite broadcast receiving
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0045 Arrangements at the receiver end
• CPC Class Codes: H04L 1/0057 Block codes H04L1/0061, H04L1/0064 take precedence
• CPC Class Codes: H04L 1/0059 Convolutional codes
• CPC Class Codes: H04L 1/0065 Serial concatenated codes
• CPC Class Codes: H04L 2001/0097 Relays
• CPC Class Codes: H04N 21/2383 Channel coding or modulation of digital bit-stream, e.g. QPSK modulation arrangements for detecting or preventing errors in the information received by adapting the channel coding H04L1/0009; analogue front ends or means for connecting modulators, demodulators or transceivers to a transmission line H04L27/0002
• CPC Class Codes: H04N 21/4382 Demodulation or channel decoding, e.g. QPSK demodulation analog front ends or means for connecting modulators, demodulators or transceivers to a transmission line H04L27/0002
• CPC Class Codes: H04W 4/18 Information format or content conversion, e.g. adaptation by the network of the transmitted or received information for the purpose of wireless delivery to users or terminals
• CPC Class Codes: H04W 84/06 Airborne or Satellite Networks space-based or airborne stations H04B7/185
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

An apparatus for transmitting and receiving an MPEG data using a wireless LAN includes a first satellite broadcast receiver, a first data controller, a first radio data transceiver, a second radio transceiver, a second data controller and a second satellite broadcast receiver. The first radio data transceiver converts a satellite broadcast signal inputted from the first data controller and transmits it to the second radio transceiver. The second data controller controls a transmission path of the satellite broadcast signal according to determining whether the satellite broadcast signal has been encoded. The second satellite broadcast receiver decodes the satellite broadcast signal inputted from the second data controller to reproduce a moving picture or a voice.

Claims

1. An apparatus for transmitting and receiving an MPEG data using a wireless LAN comprising:

a first satellite broadcast receiver for decoding a satellite broadcast signal received through a satellite broadcast antenna and reproducing a moving picture and a voice;

a first data controller for receiving a satellite broadcast signal decoded from the first satellite broadcast receiver;

a first radio data transceiver for selectively coding the satellite broadcast signal inputted from the first data controller, and converting the inputted satellite broadcast signal or the coded satellite broadcast signal into a radio frequency signal and wirelessly transmitting it;

a second radio data transceiver for receiving the satellite broadcast signal of the radio frequency signal received from the first radio data transceiver;

a second data controller for determining whether the satellite broadcast signal received by the second radio data transceiver has been coded and controlling a transmission path of the satellite broadcast signal according to the determining result; and

a second satellite broadcast receiver for decoding the coded satellite broadcast signal received from the second data controller or data-processing the satellite broadcast signal inputted from the second data controller to reproduce a moving picture or a voice,

wherein the first and second satellite broadcast receivers performs a data communication in conformity to a DVB communication standard, and the first and second radio data transceivers performs a data communication in conformity to an IEEE802 communication standard.

2. The apparatus of claim 1, wherein the first satellite broadcast receiver comprises:

an LNB for frequency-converting the received satellite broadcast signal and outputting it;

a tuner for selecting a particular frequency band or a channel from the satellite broadcast signal inputted from the LNB;

a first QPSK demodulator for demodulating the satellite broadcast signal of the particularly frequency band or the channel selected by the tuner;

a first Viterbi decoder for decoding the demodulated satellite broadcast signal;

a first deinterleaver for deinterleaving the decoded satellite broadcast signal;

a first RS decoder for decoding the deinterleaved satellite broadcast signal;

a first descrambler for descrambling the decoded satellite broadcast signal; and

a first TP unit for data-processing the descrambled satellite broadcast signal,

wherein the first RS decoder outputs the decoded satellite broadcast signal to the first descrambler or to the first data controller.

3. The apparatus of claim 1, wherein the first radio data transceiver comprises:

a first media access controller (MAC) for receiving the satellite broadcast signal from the first data controller;

a first RS encoder for coding the satellite broadcast signal inputted to the first media access controller by using a shortened RS code in conformity to the DVB communication standard;

a first scrambler for scrambling the satellite broadcast signal coded by the first RS encoder or the satellite broadcast signal received from the first MAC;

a first convolutional encoder for coding the scrambled satellite broadcast signal according to a convolutional code;

a first interleaver for interleaving the satellite broadcast signal coded according to the convolutional code;

a first OFDM modulator for modulating the interleaved satellite broadcast signal; and

a first RF transceiver unit for converting the modulated satellite broadcast signal into a radio frequency signal and transmitting it to the second radio data transceiver.

4. The apparatus of claim 3, wherein the forward error correction frame using the shortened RS code in conformity to the DVB communication standard comprises;

a MAC header using a shortened RS code having a 32 byte input data and a 16 byte redundancy;

a frame body using a shortened RS code having a 188 byte input data and a 16 byte redundancy; and

a 4 byte FCS for checking an error of the frame.

5. The apparatus of claim 1, wherein the second radio data transceiver comprises:

a second RF transceiver for lowering a frequency band of the satellite broadcast signal received from the first radio data transceiver to a base band;

a first OFDM demodulator for demodulating the satellite broadcast signal of which the frequency band has been lowered to the base band;

a second deinterleaver for deinterleaving the demodulated satellite broadcast signal;

a second Viterbi decoder for decoding the deinterleaved satellite broadcast signal;

a second descrambler for descrambling the decoded satellite broadcast signal;

a second media access controller for transmitting the descrambled satellite broadcast signal to the second data controller; and

a second RS encoder for coding the satellite broadcast signal received from the second data controller according to a shortened RS code in conformity to the DVB communication standard.

6. The apparatus of claim 1, wherein the second satellite broadcast receiver comprises;

a second RS decoder for decoding the satellite broadcast signal inputted from the second data controller according to a shortened RS code in conformity of the DVB communication standard;

a third descrambler for descrambling the decoded satellite broadcast signal;

a second TP unit for data-processing the descrambled satellite broadcast signal and outputting it; and

an MPEG decoder for decoding the data-processed satellite broadcast signal and reproducing a mobile image and a voice,

wherein the second RS decoder decodes the satellite broadcast signal and outputs it to the third descrambler or to the second data controller,

and the second data controller outputs the satellite broadcast signal inputted from the second radio data transceiver to the second RS decoder if the satellite broadcast signal has been coded according to the shortened RS code in conformity to the DVB communication standard, or outputs the satellite broadcast signal inputted from the second radio data transceiver to the third descrambler or to the MPEG decoder if the satellite broadcast signal has not been coded.

7. The apparatus of claim 6, wherein the forward error correction frame using the shortened RS code in conformity to the DVB communication standard comprises;

a MAC header using a shortened RS code having a 32 byte input data and a 16 byte redundancy;

a frame body using a shortened RS code having a 188 byte input data and a 16 byte redundancy; and

a 4 byte FCS for checking an error of the frame.

8. An apparatus for transmitting and receiving an MPEG data using a wireless LAN comprising:

a first cable TV for decoding a broadcast signal inputted through a cable and reproducing a moving picture or a voice;

a first data controller for receiving a decode broadcast signal;

a first radio data transceiver for selectively coding the broadcast signal inputted from the first data controller, converting the inputted broadcast signal or the coded broadcast signal into a radio frequency signal and wirelessly transmitting it;

a second radio data transceiver for receiving a broadcast signal of the radio frequency signal received from the first radio data transceiver;

a second data controller for determining whether the broadcast signal received by the second radio data transceiver has been coded, and controlling a transmission path of the broadcast signal according to the determining result; and

a second cable TV for decoding the coded broadcast inputted from the second data controller or data-processing the broadcast signal inputted from the second data controller to reproduce a moving picture and a voice,

wherein the first and second cable TVs performs a data communication in conformity to a DVB communication standard, and the first and second radio data transceivers performs a data communication in conformity to an IEEE802 communication standard.

9. The apparatus of claim 8, wherein the first cable TV comprises:

a tuner for selecting a specific frequency band or a channel from the broadcast signal inputted through the cable;

a first QAM demodulator for demodulating the broadcast signal of the specific frequency band or the channel selected by the tuner;

a first deinterleaver for deinterleaving the demodulated broadcast signal;

a first RS decoder for decoding the deinterleaved broadcast signal;

a first descrambler for descrambling the decoded broadcast signal; and

a first TP unit for data-processing the descrambled broadcast signal and outputting it to the first data controller,

wherein the first RS decoder outputs the decoded broadcast signal to the first descrambler or to the first data controller.

10. The apparatus of claim 8, wherein the first radio data transceiver codes the broadcast signal inputted from the first data controller to a shortened RS code in conformity to the DVB communication standard, converts it to a radio frequency signal and transmits it to the second radio data transceiver,

or converts the broadcast signal inputted from the first data controller to a radio frequency signal and transmits it to the second radio data transceiver.

11. The apparatus of claim 8, wherein the second cable TV comprises:

a second RS decoder for decoding the broadcast signal inputted from the second data controller in conformity to a shortened RS code the DVB communication standard;

a second descrambler for descrambling the decoded broadcast signal;

a second TP unit for data-processing the descrambled broadcast signal and outputting it; and

an MPEG decoder for decoding the data-processed broadcast signal and reproducing a mobile image and a voice,

wherein the second RS decoder decodes the broadcast signal and outputs it to the second descrambler or to the second data controller,

and the second data controller outputs the broadcast signal inputted from the second radio data transceiver to the second RS decoder if the satellite broadcast signal has been coded according to the shortened RS code in conformity to the DVB standard, or outputs the satellite broadcast signal inputted from the second radio data transceiver to the second descrambler or to the MPEG decoder if the satellite broadcast signal has not been coded.