Method and apparatus for modem rate adaptation

• US 20040218666A1
• Filed: 04/30/2003
• Published: 11/04/2004
• 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: Nieto, John Wesley, Holcomb, Mark Thomas, Denecke, Peter Robert
• Granted Patent: US 7,372,901 B2
• Time in Patent Office: Days
• US Class Current: 375/224
• 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 over a network, comprising 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 said known first transmission characteristics;

adjusting said suggested transmission characteristic dependent upon a third measured characteristic; and

providing said suggested characteristics to said network.

2. The method as recited in claim 1, wherein said measured characteristics are selected from the group consisting of:

bit-rate, interleaver setting, frame error rate.

3. The method as recited in claim 1, wherein the step of adjusting further comprises the steps of:

altering said suggested first transmission characteristics based on one of said measured characteristics.

4. The method as recited in claim 1, wherein said measured characteristics are selected from the group consisting of:

mean value, average value, median value, variance value, standard deviation, error rate, frame error rate.

5. The method as recited in claim 1, wherein said signal samples are signal-to-noise ratio values or are proportionally related to signal-to-noise ratio values.

6. The method as recited in claim 4, wherein said frame error rate is determined as a function of the number of frames missed and the total number of frames received.

7. The method as recited in claim 1, further comprising the steps of:

validating said suggested characteristics; and

transmitting a next packet using said validated transmission characteristics.

8. The method as recited in claim 7, wherein said step of validating further comprises the steps of:

verifying said suggested characteristics are within known parameters, otherwise set said validated characteristics to known values.

9. A system for dynamically determining transmission characteristics of a transmitting modem transmitting information over a network comprising:

a receiving modem operable to receive a signal from said network, further comprising a processor and a memory, said processor operable to execute code to determine a plurality of measured characteristics associated with a plurality of received samples collected over a known period;

suggest 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 said known first transmission characteristics;

adjust said suggested transmission characteristic dependent upon a third measured characteristic; and

provide said suggested characteristics to said network.

10. The system as recited in claim 9, wherein said measured characteristics are selected from the group consisting of:

bit-rate, interleaver setting, frame error rate.

11. The system as recited in claim 9, wherein said processor is further operable to executed code to:

alter said suggested first transmission characteristics based on one of said measured characteristics.

12. The system as recited in claim 9, wherein said measured characteristics are selected from the group consisting of:

mean value, average value, median value, variance value, standard deviation, error rate, frame error rate.

13. The system as recited in claim 9, wherein said signal samples are signal-to-noise ratio values or are proportionally related to signal-to-noise ratio values.

14. The system as recited in claim 12, wherein said frame error rate is determined as a function of the number of frames missed and the total number of frames received.

15. The system as recited in claim 9, wherein said transmitting mode further comprises:

a processor and memory, said processor operable to execute code to;

receive said suggested characteristics from said network;

validate said suggested characteristics; and

transmit a next packet using said validated transmission characteristics.

16. The system as recited in claim 15, wherein said processor is further operable to execute code to:

verify said suggested characteristics are within known parameters, otherwise setting said validated characteristics to known values.