Method and apparatus for modem rate adaptation

• US 7,372,901 B2
• Filed: 04/30/2003
• Issued: 05/13/2008
• Est. Priority Date: 04/30/2003
• Status: Active Grant

• Current Assignee: Harris Global Communications, Inc. (L3Harris Technologies, Inc.)
• Original Assignee: Harris Corporation (L3Harris Technologies, Inc.)
• Inventors: Holcomb, Mark Thomas, Nieto, John Wesley, Denecke, Peter Robert
• Primary Examiner(s): Fan, Chieh M.
• Assistant Examiner(s): Aghdam, Freshteh N
• Application Number:
  US10/425,618
• Publication Number:
  US 20040218666A1
• Time in Patent Office: 1,840 Days
• Field of Search: 375/222, 375/225, 370/465
• US Class Current: 375/225
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/0006 by adapting the transmission format
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27

Abstract

A method and system for dynamically determining transmission characteristics of a modem transmitting information over a network is disclosed. The method comprises the steps of determining a plurality of measured characteristics associated with a plurality of received samples collected over a known period, suggesting a first transmission characteristic from a plurality of known first transmission characteristics associated with a selected second measured characteristic based on a first measured characteristic in relation to a threshold value associated with each of the known first transmission characteristics, adjusting the suggested transmission characteristic dependent upon a third measured characteristic, and providing the suggested characteristics to the network. The method further comprises the steps of validating the suggested characteristics and transmitting a next packet using validated transmission characteristics.

Claims

1. A method for dynamically determining transmission characteristics of a modem transmitting information, comprising:

determining a first, a second, and a third measured characteristic value for signal samples received over a known time period;

determining a first transmission characteristic value based on said first measured characteristic value;

determining a second transmission characteristic value based on said second measured characteristic value;

providing said first and said second determined transmission characteristic values to said modem if said third measured characteristic value is less than a first threshold; and

adjusting at least one of said first and second determined transmission characteristic values if said third measured characteristic value is greater than a second threshold and providing said at least one adjusted first and second determined transmission characteristic values to said modem, wherein said first measured characteristic value is a variance value, and wherein said second measured characteristic value is a mean value.

2. The method of claim 1 wherein said third measured characteristic value is a frame error rate.

3. A method for dynamically determining transmission characteristics of a modem transmitting information, comprising:

determining a mean value for signal samples received over a known time period;

determining a variance value for said samples;

determining an interleaver setting based on said variance value, wherein said interleaver selling is a first transmission characteristic;

determining a data rate value based on said mean value and said interleaver setting, wherein said data rate value is a second transmission characteristic;

determining a frame error rate for said samples;

providing said first and second determined transmission characteristics to said modem if said frame error rate is less than a first threshold; and

adjusting at least one of said first and second determined transmission characteristics if said frame error rate is greater than a second threshold and providing said at least one adjusted first and second determined transmission characteristic values to said modem.

4. A system for dynamically determining transmission characteristics of a transmitting modem transmitting information, comprising:

a receiving modem operable to receive a signal, said modem comprising a processor;

said processor operable to execute code to;

determine a first, a second, and a third measured characteristic value for signal samples of said signal received over a known time period;

determine a first transmission characteristic value based on said first measured characteristic value;

determine a second transmission characteristic value based on said second measured characteristic value;

provide said first and said second determined transmission characteristic values to said transmitting modem if said third measured characteristic value is less than a first threshold; and

adjust at least one of said first and second determined transmission characteristic values if said third measured characteristic value is greater than a second threshold and provide said at least one adjusted first and second determined transmission characteristic values to said transmitting modem, wherein said first measured characteristic value is a variance value, and wherein said second measured characteristic value is a mean value.

5. The system of claim 4 wherein said third measured characteristic value is a frame error rate.

6. A system for dynamically determining transmission characteristics of a transmitting modem transmitting information, comprising:

a receiving modem operable to receive a signal, said modem comprising a processor;

said processor operable to execute code to;

determine a mean value for signal samples received over a known time period;

determine a variance value for said samples;

determine an interleaver setting based on said variance value, wherein said interleaver setting is a first transmission characteristic;

determine a data rate value based on said mean value and said interleaver setting, wherein said data rate value is a second transmission characteristic;

determine a frame error rate for said samples;

provide said first and second determined transmission characteristics to said transmitting modem if said frame error rate is less than a first threshold; and

adjust at least one of said first and second determined transmission characteristics if said frame error rate is greater than a second threshold and provide said at least one adjusted first and second determined transmission characteristic values to said transmitting modem.