Apparatus for wireless RF transmission of uncompressed HDTV signal

• US 20040196404A1
• Filed: 04/03/2003
• Published: 10/07/2004
• Est. Priority Date: 04/03/2003
• Status: Abandoned Application

• Current Assignee: The Boeing Co.
• Original Assignee: The Boeing Co.
• Inventors: Loheit, Kurt W., Salter, William A.
• Application Number:
  US10/408,002
• Publication Number:
  US 20040196404A1
• Time in Patent Office: Days
• US Class Current: 348/492
• CPC Class Codes: H04B 7/10 Polarisation diversity; Directional diversity
• CPC Class Codes: H04L 7/0091 Transmitter details
• 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: H04N 21/6131 involving transmission via a mobile phone network wireless downlink channel access H04W74/006
• CPC Class Codes: H04N 7/015 High-definition television systems

Abstract

A system for transmitting and receiving an uncompressed HDTV signal over a wireless RF link includes a clock that provides a clock signal synchronized to the uncompressed HDTV signal and a data regeneration module connected to the clock, which provides a stream of regenerated data from the uncompressed HDTV signal. A demultiplexer demultiplexes the stream of regenerated data, using the clock signal, into an I data stream and a Q data stream. A modulator connected to the demultiplexer modulates a carrier with the I data stream and the Q data stream. A demodulator receives the carrier and demodulates the carrier so that the I data stream and the Q data stream are recovered. A multiplexer connected to the demodulator multiplexes the I data stream and the Q data stream into a single stream of HDTV data so that the uncompressed HDTV signal is recovered.

Claims

1. A system for transmitting and receiving an uncompressed HDTV signal over a wireless RF link, comprising:

a clock that provides a clock signal synchronized to the uncompressed HDTV signal;

a data regeneration module connected to said clock and that provides a stream of regenerated data from the uncompressed HDTV signal, wherein said clock signal is synchronized to said stream of regenerated data;

a demultiplexer that demultiplexes said stream of regenerated data, using said clock signal, into an I data stream and a Q data stream;

a modulator connected to said demultiplexer that modulates a carrier with said I data stream and said Q data stream;

a demodulator that receives said carrier and demodulates said carrier so that said I data stream and said Q data stream are recovered;

a multiplexer connected to said demodulator and that multiplexes said I data stream and said Q data stream into a single stream of HDTV data that recovers the uncompressed HDTV signal.

2. The system of claim 1, further comprising:

an encoder connected to said data regeneration module and that encodes said stream of regenerated data, producing a stream of encoded data;

and provides a second clock signal synchronized to said stream of encoded data; and

wherein;

said demultiplexer demultiplexes said stream of encoded data, using said second clock signal, into said I data stream and said Q data stream.

3. The system of claim 1, wherein said clock uses edge detection of said uncompressed HDTV signal to generate said clock signal.

4. The system of claim 1, wherein said clock uses a “

times-2”

multiplier with said uncompressed HDTV signal to generate said clock signal.

5. The system of claim 2, wherein said encoder includes a PLL that generates said second clock signal.

6. The system of claim 2, wherein said encoder performs forward error correction coding of said stream of regenerated data.

7. The system of claim 1, wherein said modulator is a QPSK MMIC modulator.

8. The system of claim 1, further comprising:

a local oscillator connected to said modulator;

a multiplier connected to said modulator and to said local oscillator so that said carrier is upconverted to a modulated signal having twice the frequency of said local oscillator.

9. The system of claim 1, further comprising:

a receiver front end that down converts a modulated signal to said carrier at an IF frequency.

10. The system of claim 1, further comprising:

a decoder connected to said multiplexer that decodes said single stream of HDTV data to recover the uncompressed HDTV signal.

11. A system for transmitting an uncompressed HDTV signal over a wireless RF link, comprising:

a data regeneration module that provides a stream of regenerated data from the uncompressed HDTV signal;

a clock that provides a first clock signal synchronized to said stream of regenerated data;

an encoder connected to said clock and to said data regeneration module and that encodes said stream of regenerated data, producing a stream of encoded data, and that provides a second clock signal synchronized to said stream of encoded data;

a demultiplexer connected to said encoder that demultiplexes said stream of encoded data, using said second clock signal, into an I data stream and a Q data stream; and

a modulator connected to said demultiplexer that modulates a carrier with said I data stream and said Q data stream.

12. The system of claim 11, wherein:

said encoder encodes said stream of regenerated data using a forward error correction code;

said stream of regenerated data has a first data rate of 1.485 Gbps; and

said stream of encoded data has a second data rate higher than said first data rate by a coding overhead of said forward error correction code;

and said second clock signal has a rate higher than said first clock signal by said coding overhead.

13. The system of claim 11, wherein said clock uses edge detection of said stream of regenerated data to generate said first clock signal.

14. The system of claim 11, wherein said clock uses a “

times-2”

multiplier with said stream of regenerated data to generate said first clock signal.

15. The system of claim 11, wherein said encoder includes a PLL that synchronizes said second clock signal to said stream of encoded data.

16. The system of claim 11, wherein said encoder performs Reed-Solomon forward error correction coding of said stream of regenerated data.

17. The system of claim 11, wherein said modulator is a 16-QAM MMIC modulator.

18. The system of claim 11, further comprising:

a local oscillator connected to said modulator, said local oscillator providing a frequency in the range of 18-22 GHz;

a multiplier connected to said modulator and to said local oscillator so that said carrier has a center frequency twice the frequency of said local oscillator.

19. A system for receiving an uncompressed HDTV signal over a wireless RF link, comprising:

a receiver front end that down converts an RF signal to an IF frequency carrier;

a demodulator connected to said receiver front end and that receives said IF frequency carrier and demodulates said IF frequency carrier so that an I data stream and a Q data stream are recovered;

a multiplexer connected to said demodulator and that multiplexes said I data stream and said Q data stream into a single stream of encoded HDTV data; and

a decoder connected to said multiplexer that decodes said single stream of encoded HDTV data so that the uncompressed HDTV signal is recovered.

20. The system of claim 19, further comprising:

a clock that generates a clock signal from said I data stream and said Q data stream, said clock signal synchronized to said I data stream and said Q data stream; and

wherein;

said multiplexer is connected to said clock and uses said clock signal as a timing source to multiplex said I data stream and said Q data stream into said single stream of encoded HDTV data.

21. The system of claim 20, wherein said clock signal provides a timing source for decoding said single stream of encoded HDTV data.

22. The system of claim 19, wherein said receiver front end down converts said RF signal to a carrier having an IF frequency greater than 1.5 GHz and less than 6 GHz.

23. The system of claim 19, further comprising:

an ortho-mode transducer that separates an LHCP signal from an RHCP signal.

25. The HDTV system of claim 19, further comprising:

an ortho-mode transducer that separates an LHCP signal carrying a first uncompressed HDTV signal from an RHCP signal carrying a second uncompressed HDTV signal.

24. An HDTV system that transmits and receives an uncompressed HDTV signal over a wireless RF link, said HDTV system comprising:

a data regeneration module that provides a stream of regenerated data, having a first data rate of 1.485 Gbps, from the uncompressed HDTV signal;

a first clock that provides a first clock signal synchronized to said stream of regenerated data wherein said first clock uses edge detection of said stream of regenerated data to generate said first clock signal;

an encoder connected to said clock and to said data regeneration module and that encodes said stream of regenerated data using a Reed-Solomon forward error correction code, producing a stream of encoded data, and that includes a PLL that provides a second clock signal synchronized to said stream of encoded data, wherein said stream of encoded data has a second data rate higher than said first data rate by a coding overhead of said Reed-Solomon forward error correction code; and

said second clock signal has a rate higher than said first clock signal by said coding overhead;

a demultiplexer connected to said encoder that demultiplexes said stream of encoded data, using said second clock signal, into an I data stream and a Q data stream;

a modulator connected to said demultiplexer that modulates a carrier by said I data stream and said Q data stream.

a receiver front end that down converts an RF signal to an IF frequency carrier with an IF frequency greater than 1.5 GHz and less than 6 GHz;

a demodulator connected to said receiver front end and that receives said IF frequency carrier and demodulates said IF frequency carrier so that an I data stream and a Q data stream are recovered;

a second clock that generates a third clock signal from said I data stream and said Q data stream, said third clock signal synchronized to said I data stream and said Q data stream;

a multiplexer connected to said demodulator and to said second clock and that uses said third clock signal to multiplex said I data stream and said Q data stream into a single stream of encoded HDTV data; and

a decoder connected to said multiplexer and that uses said third clock signal to decode said single stream of encoded HDTV data so that the uncompressed HDTV signal is recovered.

26. A method for transmitting an uncompressed HDTV signal over a wireless RF link, comprising steps of:

providing a stream of regenerated data from the uncompressed HDTV signal;

providing a first clock signal synchronized to said stream of regenerated data;

encoding said stream of regenerated data, producing a stream of encoded data;

providing a second clock signal synchronized to said stream of encoded data;

demultiplexing said stream of encoded data, using said second clock signal, into an I data stream and a Q data stream;

modulating a carrier with said I data stream and said Q data stream; and

transmitting said carrier in a signal over the wireless RF link.

27. The method of claim 26, wherein:

said step of encoding said stream of regenerated data comprises using a forward error correction code;

said stream of regenerated data has a first data rate of 1.485 Gbps;

said stream of encoded data has a second data rate higher than said first data rate by a coding overhead of said forward error correction code;

and said second clock signal has a rate higher than said first clock signal by said coding overhead.

28. The method of claim 26, wherein said step of providing said first clock signal synchronized to said stream of regenerated data comprises using edge detection of said stream of regenerated data to generate said first clock signal.

29. The method of claim 26, wherein said step of providing said first clock signal synchronized to said stream of regenerated data comprises using a “

times-2”

multiplier with said stream of regenerated data to generate said first clock signal.

30. The method of claim 26, wherein said step of providing said second clock signal comprises using a PLL that synchronizes said second clock signal to said stream of encoded data.

31. The method of claim 26, wherein said step of encoding said stream of regenerated data comprises Reed-Solomon forward error correction coding.

32. The method of claim 26, wherein said step of modulating said carrier comprises QPSK modulation of an IF carrier by said I data stream and said Q data stream and frequency upconversion of said IF carrier to said carrier.

33. The method of claim 26, wherein said step of transmitting said carrier in said signal comprises transmitting said signal with a circular polarization.

34. A method for receiving an uncompressed HDTV signal over a wireless RF link, comprising steps of:

receiving a carrier in a signal over the wireless RF link;

demodulating said carrier so that said I data stream and said Q data stream are recovered;

multiplexing said I data stream and said Q data stream into a single stream of encoded HDTV data; and

decoding said single stream of encoded HDTV data so that the uncompressed HDTV signal is recovered.

35. The method of claim 34, further comprising a step of:

generating a clock signal from said I data stream and said Q data stream, said clock signal synchronized to said I data stream and said Q data stream; and

wherein said multiplexing step comprises;

using said clock signal to multiplex said I data stream and said Q data stream into a single stream of encoded HDTV data.

36. The method of claim 34, wherein said clock signal provides a timing source for decoding said single stream of encoded HDTV data.

37. The method of claim 34, further comprising a step of down converting said signal to a carrier having an IF frequency greater than 1.5 GHz and less than 6 GHz.

38. The method of claim 34, further comprising steps of:

separating an LHCP signal from an RHCP signal;

recovering a first uncompressed HDTV signal from said LHCP signal; and

recovering a second uncompressed HDTV signal from said RHCP signal.