Parameter selection in a communication system

• US 7,197,067 B2
• Filed: 10/18/2002
• Issued: 03/27/2007
• Est. Priority Date: 02/28/2002
• Status: Active Grant

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Sommer, Naftali, Reznic, Zvi, Lusky, Itay, Yagil, Ariel, Bitran, Yigal, Shalvi, Ofir, Wajcer, Daniel, Haim, Eli, Bendel, Yosef, Senderovitz, Ran
• Primary Examiner(s): Kumar; Pankaj
• Application Number:
  US10/273,563
• Publication Number:
  US 20030182664A1
• Time in Patent Office: 1,621 Days
• Field of Search: 370/228, 370/227, 370/226, 370/225, 370/216, 370/247, 370/246, 370/241, 370/251, 370/250, 455/8, 455/7, 455/515, 455/511, 455/509, 455/507, 455/500, 455/39, 375/222, 375/219, 375/224, 725/111, 725/109, 725/105
• US Class Current: 375/224
• CPC Class Codes: H04L 1/0001 Systems modifying transmission characteristics according to link quality, e.g. power backoff adaptive data allocation for multicarrier modulation H04L5/0044; controlling transmission power for radio systems H04W52/04
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0017 where the mode-switching is based on Quality of Service requirement
• CPC Class Codes: H04L 1/0019 in which mode-switching is based on a statistical approach
• CPC Class Codes: H04L 1/20 using signal quality detector

Abstract

A method is provided for automatically optimizing parameter selection in a communication system having one or more channels for transmitting and receiving signals by the steps of: receiving a signal from a channel; characterizing impairments in the channel while gathering statistics using the received signal; analyzing the impairments to obtain recommendations for parameter modifications for improved performance; and modifying the parameters based on the recommendations. Other systems and methods are disclosed.

Claims

1. A method for automatically optimizing parameter selection in a communication system having one or more channels for transmitting and receiving signals comprising the steps of:

a. receiving a signal from a channel;

b. characterizing impairments in the channel while gathering channel statistics using the received signal;

c. analyzing the impairments using one or more of time domain and frequency domain analysis of the signal;

d. generating recommendations for parameter modifications using analysis of the impairments and out-of-band information, to improve transmission performance on the channel;

e. modifying the parameters based on the recommendations.

2. The method of claim 1 wherein transmission is occurring on the channel.

3. The method of claim 1 wherein transmission is not occurring on the channel.

9. A method according to claim 1, wherein the frequency domain analysis comprises:

estimating noise spectrum of the signal;

characterizing ingress impairments by identifying at least one or more of center frequencies, bandwidth, and powers of each ingress; and

selecting frequency domain transmission parameters including at least one or more of carrier frequency, baudrate, and constellation for upstream QAM signal.

10. A method according to claim 1, wherein the time domain analysis comprises:

characterizing at least one or more of impulse noise, burst noise, and White Gaussian Noise (WGN) of the signal.

11. A method according to claim 10, wherein the time domain analysis further comprises:

selecting at least one or more of Read-Solomon code, byte interleaver, and S-CDMA spreader to compensate impulse and burst noises.

12. A method according to claim 10, wherein the time domain analysis further comprises:

selecting at least one or more of transmission spectral density constellation, Read-Solomon parameters, and a number of active codes in S-CDMA transmission to compensate WGN.

4. A system for automatically optimizing parameter selection in a communication system having one or more channels for transmitting and receiving signals comprising:

a. one or more low level analysis modules coupled to the channels for characterizing impairments in the channels using one or more of time domain and frequency domain analysis of signals; and

b. one or more high level analysis modules having inputs coupled to the low level analysis modules and for receiving out-of-band information, and outputs coupled to the communication system for analyzing the impairments to determine recommendations for parameter modifications for improved performance.

5. The system of claim 4 wherein transmission is occurring on one or more of the channels.

6. The system of claim 4 wherein transmission is not occurring on one or more of the channels.

7. The system of claim 4 wherein the system is part of a cable modem termination system.

8. The system of claim 4 wherein the communication system comprises a receiver having a first digital front end for processing active transmissions and a second digital front end for processing signals to use for optimizing parameter selection.