DMT symbol repetition in the presence of impulse noise

• US 7,796,705 B2
• Filed: 10/14/2005
• Issued: 09/14/2010
• Est. Priority Date: 10/15/2004
• Status: Active Grant

• Current Assignee: TQ Delta LLC (Techquity Capital Management, LLC)
• Original Assignee: Aware Incorporated (Crowley Holdings Preferred LLC)
• Inventors: Tzannes, Marcos C.
• Primary Examiner(s): Payne, David C
• Assistant Examiner(s): Wong, Linda
• Application Number:
  US11/575,598
• Publication Number:
  US 20070217491A1
• Time in Patent Office: 1,796 Days
• Field of Search: 375/298, 375/320, 375/322, 375/329, 375/334, 375/340, 375/302, 375/300, 375/309, 375/268, 375/271, 375/279, 375/295, 375/316, 714/701, 714/746, 714/1, 370/252, 370/231, 370/235
• US Class Current: 375/295
• CPC Class Codes: H04B 1/0475 with means for limiting noise, interference or distortion H04B1/0483 takes precedence
• CPC Class Codes: H04B 3/50 Systems for transmission between fixed stations via two-conductor transmission lines H04B3/54 takes precedence
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0011 applied to payload information
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• 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 1/0061 Error detection codes
• CPC Class Codes: H04L 1/007 Unequal error protection for format H04L1/0078; for codes per se H03M13/35
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04L 1/20 using signal quality detector
• CPC Class Codes: H04M 11/062 using different frequency bands for speech and other data

Abstract

With the current initialization procedures defined in the VDSL and ADSL standards, even though the xDSL system could operate in Showtime in an impulse noise environment where symbols are being corrupted, the transceivers would not be able to reach Showtime because initialization would fail due to initialization message failure. Through the use of an improved initialization procedure for communication systems, operation in environments with higher levels of impulse noise is possible.

Claims

1. In a Discrete Multi-Tone (DMT) transceiver, a method of improving initialization in the presence of impulse noise comprising:

transmitting or receiving, during an initialization procedure of the DMT transceiver, wherein the initialization procedure occurs prior to Showtime, a first initialization message indicating an Impulse Noise Protection (INP) value, wherein the INP value is used for DMT symbols transmitted during Showtime and the INP value specifies a number of consecutive DMT symbols that, when completely corrupted by impulse noise, can be corrected; and

transmitting, during the initialization procedure of the DMT transceiver, wherein the initialization procedure occurs prior to Showtime, a second initialization message by modulating at least one message bit of the second initialization message onto a DMT symbol and repeatedly transmitting the DMT symbol N times, wherein N=A*INP+B, where A and B are integers and INP is the impulse noise protection value.

3. The method of claim 1, wherein at least one CRC bit is modulated onto at least one repeated DMT symbol.

4. The method of claim 3, further comprising demodulating the at least one CRC bit from the at least one repeated DMT symbol.

5. The method of claim 1, further comprising demodulating the at least one message bit.

6. The method of claim 1, wherein the repeated DMT symbols are consecutive, identical DMT symbols.

7. The method of claim 1, wherein A=2 and B=1.

2. In a Discrete Multi-Tone (DMT) transceiver, a method of improving initialization in the presence of impulse noise comprising:

transmitting or receiving, during an initialization procedure of the DMT transceiver, wherein the initialization procedure occurs prior to Showtime, a first initialization message indicating an Impulse Noise Protection (INP) value, wherein the INP value is used for DMT symbols transmitted during Showtime and the INP value specifies a number of consecutive DMT symbols that, when completely corrupted by impulse noise, can be corrected; and

receiving, during the initialization procedure of the DMT transceiver, wherein the initialization procedure occurs prior to Showtime, a second initialization message, wherein at least one message bit of the second initialization message was modulated onto a DMT symbol and the DMT symbol repeatedly transmitted N times, wherein N=A*INP+B, where A and B are integers and INP is the impulse noise protection value.

8. The method of claim 2, wherein at least one CRC bit is modulated onto at least one repeated DMT symbol.

9. The method of claim 8, further comprising demodulating the at least one CRC bit from the at least one repeated DMT symbol.

10. The method of claim 2, further comprising demodulating the at least one message bit.

11. The method of claim 2, wherein the repeated DMT symbols are consecutive, identical DMT symbols.

12. The method of claim 2, wherein A=2 and B=1.

13. A Discrete Multi-Tone (DMT) transceiver that is capable of improving initialization in the presence of impulse noise comprising:

a transmitter or a receiver module, capable of transmitting or receiving, respectively, during an initialization procedure of the DMT transceiver, wherein the initialization procedure occurs prior to Showtime, a first initialization message indicating an Impulse Noise Protection (INP) value, wherein the INP value is used for DMT symbols transmitted during Showtime and the INP value specifies a number of consecutive DMT symbols that, when completely corrupted by impulse noise, can be corrected; and

the transmitter module capable of transmitting, during the initialization procedure of the DMT transceiver, wherein the initialization procedure occurs prior to Showtime, a second initialization message by modulating at least one message bit of the second initialization message onto a DMT symbol and repeatedly transmitting the DMT symbol N times, wherein N=A*INP+B, where A and B are integers and INP is the impulse noise protection value.

15. The transceiver of claim 13, wherein at least one CRC bit is modulated onto at least one repeated DMT symbol.

16. The transceiver of claim 15, further comprising a demodulation module capable of demodulating the at least one CRC bit from the at least one repeated DMT symbol.

17. The transceiver of claim 13, further comprising a demodulation module capable of demodulating the at least one message bit.

18. The transceiver of claim 13, wherein the repeated DMT symbols are consecutive, identical DMT symbols.

19. The transceiver of claim 13, wherein A=2 and B=1.

14. A Discrete Multi-Tone (DMT) transceiver that is capable of improving initialization in the presence of impulse noise comprising:

a transmitter or a receiver module, capable of transmitting or receiving, respectively, during an initialization procedure of the DMT transceiver, wherein the initialization procedure occurs prior to Showtime, a first initialization message indicating an Impulse Noise Protection (INP) value, wherein the INP value is used for DMT symbols transmitted during Showtime and the INP value specifies a number of consecutive DMT symbols that, when completely corrupted by impulse noise, can be corrected; and

the receiver module capable of receiving, during the initialization procedure of the DMT transceiver, wherein the initialization procedure occurs prior to Showtime, a second initialization message, wherein at least one message bit of the second initialization message was modulated onto a DMT symbol and the DMT symbol repeatedly transmitted N times, wherein N=A*INP+B, where A and B are integers and INP is the impulse noise protection value.

20. The transceiver of claim 14, wherein at least one CRC bit is modulated onto at least one repeated DMT symbol.

21. The transceiver of claim 20, further comprising a demodulation module capable of demodulating the at least one CRC bit from the at least one repeated DMT symbol.

22. The transceiver of claim 14, further comprising a demodulation module capable of demodulating the at least one message bit.

23. The transceiver of claim 14, wherein the repeated DMT symbols are consecutive, identical DMT symbols.

24. The method of claim 14, wherein A=2 and B=1.

25. A non-transitory computer readable information storage media including instructions, that if executed by a processer, cause to be performed a method of improving initialization in the presence of impulse noise, the method comprising:

transmitting or receiving, during an initialization procedure of a DMT transceiver, wherein the initialization procedure occurs prior to Showtime, a first initialization message indicating an Impulse Noise Protection (INP) value, wherein the INP value is used for DMT symbols transmitted during Showtime and the INP value specifies a number of consecutive DMT symbols that, when completely corrupted by impulse noise, can be corrected; and

transmitting, during the initialization procedure of the DMT transceiver, wherein the initialization procedure occurs prior to Showtime, a second initialization message by modulating at least one message bit of the second initialization message onto a DMT symbol and repeatedly transmitting the DMT symbol N times, wherein N=A*INP+B, where A and B are integers and INP is the impulse noise protection value.

27. The media of claim 25, wherein at least one CRC bit is modulated onto at least one repeated DMT symbol.

28. The media of claim 27, further comprising demodulating the at least one CRC bit from the at least one repeated DMT symbol.

29. The media of claim 25, further comprising demodulating the at least one message bit.

30. The media of claim 25, wherein the repeated DMT symbols are consecutive, identical DMT symbols.

31. The media of claim 25, wherein A=2 and B=1.

26. A non-transitory computer readable information storage media including instructions, that if executed by a processer, cause to be performed a method of improving initialization in the presence of impulse noise, the method comprising:

transmitting or receiving, during an initialization procedure of a DMT transceiver, wherein the initialization procedure occurs prior to Showtime, a first initialization message indicating an Impulse Noise Protection (INP) value, wherein the INP value is used for DMT symbols transmitted during Showtime and the INP value specifies a number of consecutive DMT symbols that, when completely corrupted by impulse noise, can be corrected; and

receiving, during the initialization procedure of the DMT transceiver, wherein the initialization procedure occurs prior to Showtime, a second initialization message, wherein at least one message bit of the second initialization message was modulated onto a DMT symbol and the DMT symbol repeatedly transmitted N times, wherein N=A*INP+B, where A and B are integers and INP is the impulse noise protection value.

32. The media of claim 26, wherein at least one CRC bit is modulated onto at least one repeated DMT symbol.

33. The media of claim 32, further comprising demodulating the at least one CRC bit from the at least one repeated DMT symbol.

34. The media of claim 26, further comprising demodulating the at least one message bit.

35. The media of claim 26, wherein the repeated DMT symbols are consecutive, identical DMT symbols.

36. The media of claim 26, wherein A=2 and B=1.