Snap to grid variable beam size digital beamforming system

• US 6,490,448 B1
• Filed: 12/10/1999
• Issued: 12/03/2002
• Est. Priority Date: 12/10/1999
• Status: Expired due to Term

• Current Assignee: CDC Propriete Intellectuelle
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Hogberg, Shawn Wesley, Davieau, Gerald Joseph, Gross, Jonathan Henry
• Primary Examiner(s): Bost, Dwayne
• Assistant Examiner(s): Old, Gregory V.
• Application Number:
  US09/459,001
• Time in Patent Office: 1,089 Days
• Field of Search: 455/427, 455/428, 455/429-431, 455/12.1, 455/13.1, 455/13-- 1, 342/354, 342/352, 342/353, 342/373
• US Class Current: 455/427
• CPC Class Codes: H04B 7/18543 for adaptation of transmission parameters, e.g. power control for detecting or preventing errors in the information received H04L1/00
• CPC Class Codes: H04B 7/2041 Spot beam multiple access

Abstract

A satellite communications system (10) provides for snap to grid variable beam size digital beamforming. The communications system (10) has an antenna configuration (20) for maintaining communications links with satellite networking equipment, and a signal processing system (30) for processing signals resulting from the communications links. The beamforming subsystem (40) forms beams based on the processed signals wherein the beams match predetermined grid information. The beamforming subsystem (40) includes a grid database (50) containing predetermined grid information. A beamforming processor (60) converts the predetermined grid information contained in the grid database (50) antenna coefficients. An antenna management system forms beams based on the antenna coefficients.

Claims

1. A method for providing satellite communication channels within a satellite footprint, the method comprising the steps of

generating a predetermined grid for the satellite footprint, the predetermined grid containing link margin information for the communication channels;

extracting variable beam sizes from the link margin information;

forming beams such that the beams match the variable beam sizes, the beams containing the communication channels; and

aligning the beams with the predetermined grid.

2. The method of claim 1 further comprising the step of extracting beam locations from the predetermined grid.

3. The method of claim 2 wherein the predetermined grid has a temporal dependence.

4. The method of claim 2 wherein the predetermined grid has a geographical dependence.

5. The method of claim 1 further comprising the step of managing power and processing consumption based on the predetermined grid.

6. The method of claim 1 further comprising the step of extracting communication channel information from the link margin information.

7. The method of claim 6 wherein the channel information include information about in-building communication channels.

8. The method of claim 6 wherein the channel information include information about in-vehicle communication channels.

9. The method of claim 6 wherein the channel information include information about mobile outdoor channels.

10. A satellite communications system comprising:

an antenna configuration for maintaining communications links with satellite networking equipment;

a signal processing system for processing signals resulting from the communications links; and

a beamforming subsystem for forming beams based on the signals processed by the signal processing system, the beams matching predetermined grid information, said beam forming subsystem comprising;

a grid database containing the predetermined grid information;

a beamforming processor for converting the predetermined grid information contained in the grid database into antenna coefficients, said beamforming processor comprising;

a beam location module for updating beam locations based on the predetermined grid information contained in the grid database;

a beam shape module for updating beam shapes based on the predetermined grid information and the updated beam locations;

a fault mitigation module for generating power and processing consumption management information based on satellite hardware constraints; and

a beamform coefficient processor for calculating antenna coefficients based on the beam locations updated by the beam location module, the beam shapes updated by the beam shape module, power and processing consumption management information, and physical configuration data; and

an antenna management system for forming beams based on the antenna coefficients.

11. The communications system of claim 10 wherein the antenna configuration includes:

a feederlink antenna for maintaining feederlinks with ground stations;

a crosslink antenna for maintaining crosslinks with satellite vehicles; and

a subscriber antenna configuration for maintaining subscriber links with subscriber devices.

12. The communications system of claim 11 wherein the subscriber antenna configuration includes:

a subscriber transmit antenna for transmitting subscriber link beams to subscriber devices; and

a subscriber receive antenna for receiving subscriber link signals from subscriber devices.

13. The communications system of claim 10 wherein the signal processing system includes:

a communication electronics subsystem for performing communication functions in the communications system; and

a processor subsystem for performing management and control functions in the communications system, the processor subsystem updating a grid database with predetermined grid information.

14. The communications system of claim 13 wherein the communication electronics subsystem performs frequency conversion, switching, and modem functions.

15. The communications system of claim 13 wherein the processor subsystem performs channel management, satellite resource management and satellite control functions.

16. A beamforming subsystem for a satellite communications system, the subsystem comprising:

a grid database containing predetermined grid information;

a beamforming processor for converting the predetermined grid information the grid database into antenna coefficients, said beamforming processor comprising;

a beam location module for updating beam locations based on the predetermined grid information contained in the grid database;

a beam shape module for updating beam shapes based on the predetermined grid information and the updated beam locations;

a fault mitigation module for generating power and processing consumption management information based on satellite hardware constraints; and

a beamform coefficient processor for calculating antenna coefficients based on the beam locations updated by the beam location module, the beam shapes updated by the beam shape module, power and processing consumption management information, and physical configuration data; and

an antenna management system for forming beams based on the antenna coefficients.

17. The beamforming subsystem of claim 16 wherein the predetermined grid information contains information regarding desired beam locations, beam coverage area, link margins, and associated antenna gains.

18. The beamforming subsystem of claim 16 wherein the beamform coefficient processor calculates transmit antenna coefficients and receive antenna coefficients.

19. The beamforming subsystem of claim 16 wherein the antenna management system includes:

a transmit antenna manager for forming beams for a subscriber transmit antenna; and

a receive antenna manager for forming beams for a subscriber receive antenna.

20. The beamforming subsystem of claim 16 further including:

a hardware constraint module for providing the beamforming processor with satellite hardware constraint data; and

a satellite position and attitude module for providing the beamforming processor with satellite position and attitude data.