 |
|
|
|
|
|
 Title: |
US5268694:
Communication system employing spectrum reuse on a spherical surface
[ Derwent Title ]
|
| Country: |
US United States of America
|
| |
| Inventor: |
Jan, Yih G.; Chandler, AZ
Peterson, Kenneth M.; Phoenix, AZ
|
| Assignee: |
Motorola, Inc., Schaumburg, IL
other patents from MOTOROLA, INC. (386735) (approx. 18,357)
News, Profiles, Stocks and More about this company
|
| Published / Filed: |
1993-12-07
/ 1992-07-06
|
| Application Number: |
US1992000909487
|
| IPC Code: |
Advanced:
H04B 7/185;
H04B 7/204;
H04B 7/26;
H04Q 7/36;
Core:
more...
IPC-7:
H04B 1/10;
H04B 7/185;
H04M 9/00;
H04Q 7/00;
|
| U.S. Class: |
Current:
342/354;
455/063.4;
455/427;
Original:
342/354;
455/033.1;
455/033.4;
455/063;
379/060;
|
| Field of Search: |
342/352,354
455/33.1,33.2,33.4,73,103,63
379/059,60
|
| Priority Number: |
| 1992-07-06 |
US1992000909487 |
|
| Abstract: |
Orbiting satellites project footprints on the earth. Each footprint is divided into cells. Footprints of nearby satellites overlap one another, and the overlap increases as satellites approach a pole from the equator. The positions of all cells generated by all satellites are simulated at numerous points throughout an orbit. Cells are marked as being active or inactive to compensate for the overlap at each simulated point. Channel sets are assigned to cells within a reference footprint, and this assignment is propagated throughout all footprints in the referenced footprint's orbit. The channel set sequences are propagated to other orbits after taking into account inactive cells located near boundaries between the orbits. Each satellite stores channel set assignments for its cells at the various points throughout its orbit. All satellites switch their communication parameters at the same instant in response to the channel set assignments.
|
| Attorney, Agent or Firm: |
Handy, Robert M. ;
|
| Primary / Asst. Examiners: |
Issing, Gregory C.;
|
| INPADOC Legal Status: |
Show legal status actions
Family Legal Status Report
|
| Family: |
Show 16 known family members
|
First Claim:
Show all 20 claims |
What is claimed is:
1. A method of operating first and second spaced apart antennas, said first and second antennas projecting first and second footprints, respectively, said first and second footprints each being divided into a plurality of cells, said method comprising the steps of:
- positioning said antennas so that said first and second footprints overlap;
- defining said cells of said footprints as being active or inactive in response to said overlap; and
- assigning channels to said active ones of said cells of said first and second footprints in accordance with a spectrum reuse plan that maintains a minimum predetermined separation distance between co-channel cells.
|
| Background / Summary: |
Show background / summary
|
| Drawing Descriptions: |
Show drawing descriptions
|
| Description: |
Show description
|
| Forward References: |
Show 39 U.S. patent(s) that reference this one
|
|
