Spectrum management systems and methods for cable networks

• US 20050058082A1
• Filed: 09/10/2004
• Published: 03/17/2005
• Est. Priority Date: 09/11/2003
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: General Instrument Corporation (CommScope Holding Company, Inc.)
• Inventors: Moran, John L. III, Cooper, Michael, Boontor, Poth
• Granted Patent: US 7,616,654 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 25/00 Baseband systems

Abstract

The present methods and systems provide spectrum management for enhancing upstream performance for cable networks. According to one embodiment, a method of enhancing upstream performance in a cable network includes the steps of measuring performance of an upstream channel at a first data signaling rate; determining whether the upstream channel supports a second data signaling rate based on the performance; and selectively transitioning to the second data signaling rate based on said determination. The second data signaling rate is a higher rate than the first data signaling rate.

Claims

1. A method of enhancing upstream performance in a cable network, the method comprising:

measuring performance of an upstream channel at a first data signaling rate;

determining whether said upstream channel supports a second data signaling rate based on said performance, said second data signaling rate being a higher rate than said first data signaling rate; and

selectively transitioning to said second data signaling rate based on said determination.

2. The method of claim 1, wherein said upstream channel is representative of an active channel arranged in parallel with said upstream channel.

3. The method of claim 2, wherein said step of measuring is performed without affecting transmissions on said active channel.

4. The method of claim 2, wherein said step of selectively transitioning includes implementing said second data signaling rate on said active channel if said upstream channel is determined to support said second data signaling rate.

5. The method of claim 4, wherein said step of implementing includes setting operation parameters for said active channel prior to adjusting carrier frequency or bandwidth of said active channel.

6. The method of claim 4, wherein said step of measuring includes adjusting transmission parameters for transmissions on said upstream channel.

7. The method of claim 1, wherein said second data signaling rate includes a 256 quadrature amplitude modulation (QAM) constellation.

8. The method of claim 1, wherein said step of measuring includes determining available signal-to-noise ratio (SNR) margins on said upstream channel, and said step of determining is based on said available SNR margins.

9. The method of claim 1, wherein said performance includes a measurement of network non-linearity.

10. A method of managing upstream spectrum in a cable network, the method comprising:

monitoring performance parameters of transmissions over an upstream channel, said performance parameters being representative of noise introduced into said transmissions; and

compensating for effects of said noise based on said performance parameters.

11. The method of claim 10, wherein said step of monitoring includes:

determining a first set of said performance parameters with a first configuration of noise compensation feature settings; and

determining a second set of said performance parameters with a second configuration of noise compensation feature settings.

12. The method of claim 11, wherein an ingress noise canceller is enabled for said step of determining said first set of said performance parameters, and said ingress noise canceller is disabled for said step of determining said second set of said performance parameters.

13. The method of claim 11, further comprising:

identifying a dominant impairment based on said first set of said performance parameters and said second set of said performance parameters.

14. The method of claim 10, wherein said step of compensating includes canceling said noise in real-time.

15. The method of claim 10, wherein said step of canceling includes canceling ingress noise.

16. The method of claim 10, further comprising equalizing amplitude to compensate for at least one of amplitude distortions, group-delay distortions, and micro-reflections.

17. The method of claim 16, wherein said step of equalizing includes executing post-equalization techniques.

18. The method of claim 16, wherein said step of equalizing includes executing pre-equalization techniques.

19. The method of claim 10, wherein said performance parameters include an indication of network non-linearity.

20. A system for managing upstream performance in a cable network, the system comprising:

an active receiver connected to an active channel; and

a spectrum management receiver connected in parallel with said active receiver;

said spectrum management receiver being configured to;

measure performance of an upstream channel at a first data signaling rate, wherein said upstream channel is representative of said active channel; and

determine whether said upstream channel supports a second data signaling rate based on said performance, said second data signaling rate being a higher rate than said first data signaling rate.

21. The system of claim 20, wherein said spectrum management receiver is further configured to selectively cause a transition to said second data signaling rate on said active channel based on said determination.

22. The system of claim 21, wherein said active receiver includes operation parameters, and wherein said spectrum management receiver is configured to instruct said active receiver to change said operation parameters prior to said active receiver adjusting carrier frequency or bandwidth.

23. The system of claim 20, wherein said performance of said upstream channel is measured without affecting transmissions on said active channel.

24. The system of claim 20, wherein said second data signaling rate includes a modulation rate of 256 quadrature amplitude modulation (QAM).

25. The system of claim 20, wherein said performance is based on available signal-to-noise ratio (SNR) margins on said upstream channel.

26. The system of claim 20, wherein said performance accounts for network non-linearity.

27. A spectrum management module configured to be connected in parallel with an active receiver connected to an active channel of a cable network, comprising:

an RF switch; and

a spectrum management receiver configured to be connected in parallel with the active receiver via said RF switch, said spectrum management receiver being configured to;

measure performance of an upstream channel at a first data signaling rate, wherein said upstream channel is representative of the active channel; and

determine whether said upstream channel supports a second data signaling rate based on said performance, said second data signaling rate being a higher rate than said first data signaling rate.

28. The spectrum management module of claim 27, wherein said spectrum management receiver is further configured to selectively cause a transition to said second data signaling rate on the active channel based on said determination.

29. The spectrum management module of claim 28, wherein said spectrum management receiver is configured to instruct the active receiver to change operation parameters prior to the active receiver adjusting carrier frequency or bandwidth.

30. The spectrum management module of claim 27, wherein said spectrum management receiver is configured to measure said performance of said upstream channel without affecting transmissions on the active channel.

31. The spectrum management module of claim 27, wherein said second data signaling rate includes a 256 quadrature amplitude modulation (QAM) constellation.

32. The spectrum management module of claim 27, wherein said performance is based on available signal-to-noise ratio (SNR) margins on said upstream channel.

33. The spectrum management module of claim 27, wherein said performance is based on non-linearity on said upstream channel.

34. A processor readable medium having instructions thereon for enhancing upstream performance in a cable network, said instructions being configured to instruct a processor to perform the steps of:

measuring performance of an upstream channel at a first data signaling rate;

determining whether said upstream channel supports a second data signaling rate based on said performance, said second data signaling rate being a higher rate than said first data signaling rate; and

selectively transitioning to said second data signaling rate based on said determination.

35. The processor-readable medium of claim 34, wherein said step of selectively transitioning includes implementing said second data signaling rate on an active channel if said upstream channel is determined to support said second data signaling rate.

36. The processor-readable medium of claim 35, wherein said step of implementing includes setting operation parameters for said active channel prior to adjusting carrier frequency or bandwidth of said active channel.

37. The processor-readable medium of claim 34, wherein said step of measuring includes adjusting transmission parameters for transmissions on said upstream channel.

38. The processor-readable medium of claim 34, wherein said step of measuring includes determining available signal-to-noise ratio (SNR) margins on said upstream channel, and said step of determining is based on said available SNR margins.

39. The processor-readable medium of claim 34, wherein said step of measuring includes estimating non-linearity on said upstream channel.