System and method for improving video transmission over a wireless network

• US 6,798,838 B1
• Filed: 03/02/2000
• Issued: 09/28/2004
• Est. Priority Date: 03/02/2000
• Status: Expired due to Term

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Ngo, Chiu Yeung
• Primary Examiner(s): Srivastava, Vivek
• Assistant Examiner(s): Demicco, Matthew R.
• Application Number:
  US09/517,726
• Time in Patent Office: 1,671 Days
• Field of Search: 382/243, 382/240, 704/500, 348/487, 348/425.2, 348/397.1, 348/398.1, 725/147, 725/48, 725/54, 725/95, 725/96, 725/131, 375/240.15, 375/240.27, 375/240.19, 455/410
• US Class Current: 375/240.19
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 2001/0098 Unequal error protection
• CPC Class Codes: H04N 21/234327 by decomposing into layers, e.g. base layer and one or more enhancement layers
• CPC Class Codes: H04N 21/44209 Monitoring of downstream path of the transmission network originating from a server, e.g. bandwidth variations of a wireless network arrangements for maintenance or administration in data switching networks involving bandwidth and capacity management H04L41/0896
• CPC Class Codes: H04N 21/4508 Management of client data or end-user data
• CPC Class Codes: H04N 21/4621 Controlling the complexity of the content stream or additional data, e.g. lowering the resolution or bit-rate of the video stream for a mobile client with a small screen arrangements for using the results of monitoring on user's side in broadcast systems H04H60/65; flow control in packet networks H04L47/10
• CPC Class Codes: H04N 21/6131 involving transmission via a mobile phone network wireless downlink channel access H04W74/006
• 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 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
• CPC Class Codes: Y02D 30/50 in wire-line communication networks, e.g. low power modes or reduced link rate

Abstract

There is disclosed a wireless communication device capable of receiving an incoming RF data signal and generating therefrom a base layer data stream and at least one enhancement layer data stream. The wireless communication device comprises: 1) a base layer decoder, 2) at least one enhancement layer decoder, 3) a variable mode receiver for demodulating the RF incoming RF data signals in a plurality of physical modes, such as BPSK, QPSK, QAM, and the like, and at a plurality of code rates and 4) a receiver mode controller for controlling the physical modes of the variable mode receiver. The receiver mode controller causes a first demodulated output signal of the variable mode receiver to be transferred to the base layer decoder when the variable mode receiver is operating in a first physical mode and causes a second demodulated output signal of the variable mode receiver to be transferred to the at least one enhancement layer decoder when the variable mode receiver is operating in a second physical mode. There also is disclosed a second wireless communication device for transmitting an outgoing RF data signal comprising a base layer data stream and at least one enhancement layer data stream. The second wireless communication device comprises: 1) a base layer encoder, 2) at least one enhancement layer encoder, 3) a variable mode transmitter for modulating an input signal in a plurality of physical modes and at a plurality of code rates to produce the outgoing RF data signal; and 4) a transmitter mode controller for controlling the plurality of physical modes of the variable mode transmitter. The transmitter mode controller causes the variable mode transmitter to transmit a base layer output signal from the base layer encoder in a first physical mode and causes the variable mode transmitter to transmit at least one enhancement layer output signal from the at least one enhancement layer encoder in a second physical mode.

Claims

1. A wireless communication device capable of receiving an incoming RF data signal and generating from said incoming RF data signal a base layer data stream and at least one enhancement layer data stream, said wireless communication device comprising:

a base layer decoder;

at least one enhancement layer decoder;

a variable mode receiver capable of demodulating said RF incoming RF data signals in a plurality of physical modes according to the type of modulation, wherein each type of modulation corresponds to a respective layer, so that each of the plurality of physical modes is demodulated into a separate data stream representing one of the base layer data stream and said at least one enhancement layer data stream ; and

a receiver mode controller capable of controlling said plurality of physical modes of said variable mode receiver, wherein said receiver mode controller causes a first demodulated output signal of said variable mode receiver to be transferred to said base layer decoder when said variable mode receiver is operating in a first physical mode and causes a second demodulated output signal of said variable mode receiver to be transferred to said at least one enhancement layer decoder when said variable mode receiver is operating in a second physical mode.

2. The wireless communication device as set forth in claim 1 wherein a bit error rate of said first physical mode is lower than a bit error rate of said second physical mode.

3. The wireless communication device as set forth in claim 1 wherein said at least one enhancement layer decoder comprises a first enhancement layer decoder and a second enhancement layer decoder.

4. The wireless communication device as set forth in claim 3 wherein said receiver mode controller causes said second demodulated output signal of said variable mode receiver to be transferred to said first enhancement layer decoder when said variable mode receiver is operating in a second physical mode and causes a third demodulated output signal of said variable mode receiver to be transferred to said second enhancement layer decoder when said variable mode receiver is operating in a third physical mode.

5. The wireless communication device as set forth in claim 4 wherein a bit error rate of said second physical mode is lower than a bit error rate of said third physical mode.

6. The wireless communication device as set forth in claim 1 wherein said plurality of physical modes comprise at least two of binary phase shift keying modulation, quadrature phase shift keying modulation, and quadrature amplitude modulation.

7. The wireless communication device as set forth in claim 1 wherein said plurality of physical modes comprise a plurality of code rates.

8. The wireless communication device as set forth in claim 1 wherein said incoming RF data signal comprises a video signal.

9. The wireless communication device as set forth in claim 1 wherein said incoming RF data signal comprises an audio signal.

10. A wireless communication device capable of transmitting an outgoing RF data signal comprising a base layer data stream and at least one enhancement layer data stream, said wireless communication device comprising:

a base layer encoder;

at least one enhancement layer encoder;

a variable mode transmitter capable of modulating an input signal in a plurality of physical modes to thereby produce said outgoing RF data signal so that different physical modes of modulated transmission correspond to one of the base laver data stream and said at least one enhancement layer data stream; and

a transmitter mode controller capable of controlling said plurality of physical modes of said variable mode transmitter, wherein said transmitter mode controller causes said variable mode transmitter to transmit a base layer output signal from said base layer encoder in a first physical mode and causes said variable mode transmitter to transmit at least one enhancement layer output signal from said at least one enhancement layer encoder in a second physical mode.

11. The wireless communication device as set forth in claim 10 wherein a bit error rate of said first physical mode is lower than a bit error rate of said second physical mode.

12. The wireless communication device as set forth in claim 10 wherein said at least one enhancement layer encoder comprises a first enhancement layer encoder and a second enhancement layer encoder.

13. The wireless communication device as set forth in claim 12 wherein said transmitter mode controller causes said variable mode transmitter to transmit a first enhancement layer output signal from said first enhancement layer encoder in said second physical mode and causes said variable mode transmitter to transmit a second enhancement layer output signal from said second enhancement layer encoder in a third physical mode.

14. The wireless communication device as set forth in claim 13 wherein a bit error rate of said second physical mode is lower than a bit error rate of said third physical mode.

15. The wireless communication device as set forth in claim 10 wherein said plurality of physical modes comprise at least two of binary phase shift keying modulation, quadrature phase shift keying modulation, and quadrature amplitude modulation.

16. The wireless communication device as set forth in claim 10 wherein said plurality of physical modes comprise a plurality of code rates.

17. The wireless communication device as set forth in claim 10 wherein said incoming RF data signal comprises a video signal.

18. The wireless communication device as set forth in claim 10 wherein said incoming RF data signal comprises an audio signal.

19. For use in a wireless communication device capable of receiving an incoming RF data signal comprising a base layer RF signal and at least one enhancement layer RF signal, a method of processing the RF data signal comprising the steps of:

demodulating the base layer RF signal in a first physical mode to thereby generate a base layer data stream;

demodulating the at least one enhancement RF signal in a second physical mode to thereby generate at least one enhancement layer data stream;

wherein the demodulation of the base layer RF signal and said at least one enhancement RF signal into said first physical mode and said second physical mode includes using different types of demodulation that correspond to a respective layer of said base layer and said at least one enhancement layer;

decoding the base layer data stream in a base layer decoder;

decoding the at least one enhancement layer data stream in at least one enhancement layer decoder; and

combining the output of the base layer decoder and the at least one enhancement layer decoder to generate a final output signal.

20. The method as set forth in claim 19 wherein a bit error rate of the first physical mode is lower than a bit error rate of the second physical mode.

21. The method as set forth in claim 19 wherein the at least one enhancement layer decoder comprises a first enhancement layer decoder and a second enhancement layer decoder.

22. The method as set forth in claim 21 wherein the step of demodulating the at least one enhancement RF signal comprises the sub-steps of:

demodulating a first enhancement layer signal in the second physical mode to generate a first enhancement layer data stream; and

demodulating a second enhancement layer signal in a second physical mode to generate a second enhancement layer data stream.

23. The method as set forth in claim 22 wherein a bit error rate of the second physical mode is lower than a bit error rate of the third physical mode.

24. The method as set forth in claim 19 wherein the plurality of physical modes comprise at least two of binary phase shift keying modulation, quadrature phase shift keying modulation, and quadrature amplitude modulation.

25. The method as set forth in claim 19 wherein the plurality of physical modes comprise a plurality of code rates.

26. The method as set forth in claim 19 wherein the final output signal comprises a video signal.

27. The method as set forth in claim 19 wherein the final output signal comprises an audio signal.

28. For use in a wireless communication device capable of transmitting to at least one receiver an incoming data signal, a method of processing the incoming data signal comprising the steps of

encoding the incoming data signal in a base layer encoder to generate therefrom a base layer data stream;

encoding the incoming data signal in at least one enhancement layer encoder to generate therefrom at least one enhancement layer data stream;

modulating the base layer data stream in a first physical mode to thereby generate a base layer RF signal; and

modulating the at least one enhancement layer data stream in a second physical mode to thereby generate at least one enhancement layer RF signal;

wherein each respective physical mode of modulated transmission correspond to one of the base layer data stream and said at least one enhancement layer data stream.

29. The method as set forth in claim 28 wherein a bit error rate of the first physical mode is lower than a bit error rate of the second physical mode.

30. The method as set forth in claim 28 wherein the at least one enhancement layer encoder comprises a first enhancement layer encoder and a second enhancement layer encoder.

31. The method as set forth in claim 30 wherein the step of modulating the at least one enhancement layer data stream comprises the sub-steps of:

modulating a first enhancement layer data stream in the second physical mode to generate a first enhancement layer RF signal; and

modulating a second enhancement layer data stream in a third physical mode to generate a second enhancement layer RF signal.

32. The method as set forth in claim 31 wherein a bit error rate of the second physical mode is lower than a bit error rate of the third physical mode.

33. The method as set forth in claim 28 wherein the plurality of physical modes comprise at least two of binary phase shift keying modulation, quadrature phase shift keying modulation, and quadrature amplitude modulation.

34. The method as set forth in claim 28 wherein the plurality of physical modes comprise a plurality of code rates.

35. The method as set forth in claim 28 wherein the incoming data signal comprises a video signal.

36. The method as set forth in claim 28 wherein the incoming data signal comprises an audio signal.