Method and system for calculating a transmitted signal characteristic in an environmental model

• US 5,831,874 A
• Filed: 05/31/1996
• Issued: 11/03/1998
• Est. Priority Date: 05/31/1996
• Status: Expired due to Fees

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Boone, Theodore Xavier, Singletary, Hayward Laverne
• Primary Examiner(s): Teska, Kevin J.
• Assistant Examiner(s): LOPPNOW, MATTHEW CLAY
• Application Number:
  US08/656,029
• Time in Patent Office: 886 Days
• Field of Search: 364/578, 364/550, 455/67.6, 455/52.1, 455/277.1, 455/277.2, 455/67.1, 455/67.3, 455/67.2, 455/67.4, 455/67.5, 455/68, 342/359
• US Class Current: 703/2
• CPC Class Codes: H04B 17/391 Modelling the propagation channel

Abstract

In a data processing system, a stored environmental model of a wireless communication system is selected. The model locates at least one object in relation to a transmitter. A parent image node is created in an image tree, wherein the parent image node is associated with the transmitter. Child image nodes are created in the image tree only for each object that can redirect a propagating signal from the transmitter with a signal characteristic that exceeds a threshold. The child image node is associated with an object energized by the transmitter, and a corresponding child image in the environment model. Next, a point of interest in the environmental model is selected. Thereafter, an accounting is made for contributions to the signal characteristic at the selected point of interest from each of the child images corresponding to the child image nodes.

Claims

1. A method for calculating a transmitted signal characteristic in an environmental model, said method comprising the steps of:

selecting an environment model that locates at least one object in relation to a transmitter;

creating a parent image node in an image tree, wherein said parent image node is associated with said transmitter;

creating child image nodes in said image tree only for each object that can redirect a propagating signal from said transmitter with a signal characteristic exceeding a threshold, said child image node being associated with an object energized by said transmitter and a corresponding child image in said environment model;

selecting a point of interest in said environmental model; and

accounting for contributions to said signal characteristic at said selected point of interest from each of said child images corresponding to said child image nodes.

2. The method for calculating a transmitted signal characteristic according to claim 1 further including the steps of:

for each of said child images, creating grandchild image nodes in said image tree only for each object that can redirect a propagating signal from said child image with a signal characteristic exceeding a threshold, said grandchild image node being associated with an object energized by said child image; and

accounting for contributions to said signal characteristic at said selected point of interest from each of said grandchild images corresponding to said grandchild image nodes.

3. The method for calculating a transmitted signal characteristic according to claim 1 wherein said signal characteristic is signal strength.

4. The method for calculating a transmitted signal characteristic according to claim 1 wherein said object includes a panel.

5. The method for calculating a transmitted signal characteristic according to claim 1 wherein said object includes a diffraction corner.

6. The method for calculating a transmitted signal characteristic according to claim 1 wherein said object energized by said transmitter includes an object in an unobstructed path from said transmitter.

7. The method for calculating a transmitted signal characteristic according to claim 1 wherein said threshold has a value equal to an ambient noise signal strength.

8. A system for calculating a transmitted signal characteristic in an environmental model, said system comprising:

means for selecting an environment model that locates at least one object in relation to a transmitter;

means for creating a parent image node in an image tree, wherein said parent image node is associated with said transmitter;

means for creating child image nodes in said image tree only for each object that can redirect a propagating signal from said transmitter with a signal characteristic exceeding a threshold, said child image node being associated with an object energized by said transmitter and a corresponding child image in said environment model;

means for selecting a point of interest in said environmental model; and

means for accounting for contributions to said signal characteristic at said selected point of interest from each of said child images corresponding to said child image nodes.

9. The system for calculating a transmitted signal characteristic according to claim 8 further including:

means for creating grandchild image nodes in said image tree only for each object that can redirect a propagating signal from said child image with a signal characteristic exceeding a threshold, said grandchild image node being associated with an object energized by said child image; and

means for accounting for contributions to said signal characteristic at said selected point of interest from each of said grandchild images corresponding to said grandchild image nodes.

10. The system for calculating a transmitted signal characteristic according to claim 8 wherein said signal characteristic is signal strength.

11. The system for calculating a transmitted signal characteristic according to claim 8 wherein said object includes a panel.

12. The system for calculating a transmitted signal characteristic according to claim 8 wherein said object includes a diffraction corner.

13. The system for calculating a transmitted signal characteristic according to claim 8 wherein said object energized by said transmitter includes an object in an unobstructed path from said transmitter.

14. The system for calculating a transmitted signal characteristic according to claim 8 wherein said threshold has a value equal to an ambient noise signal strength.

15. A computer program product for calculating a transmitted signal characteristic in an environmental model, said computer program product comprising:

a computer usable medium having computer readable program code means for selecting an environment model that locates at least one object in relation to a transmitter;

a computer usable medium having computer readable program code means for creating a parent image node in an image tree, wherein said parent image node is associated with said transmitter;

a computer usable medium having computer readable program code means for creating child image nodes in said image tree only for each object that can redirect a propagating signal from said transmitter with a signal characteristic exceeding a threshold, said child image node being associated with an object energized by said transmitter and a corresponding child image in said environment model;

a computer usable medium having computer readable program code means for selecting a point of interest in said environmental model; and

a computer usable medium having computer readable program code means for accounting for contributions to said signal characteristic at said selected point of interest from each of said child images corresponding to said child image nodes.

16. The computer program product for calculating a transmitted signal characteristic according to claim 15 further including:

a computer usable medium having computer readable program code means for creating grandchild image nodes in said image tree only for each object that can redirect a propagating signal from said child image with a signal characteristic exceeding a threshold, said grandchild image node being associated with an object energized by said child image; and

a computer usable medium having computer readable program code means for accounting for contributions to said signal characteristic at said selected point of interest from each of said grandchild images corresponding to said grandchild image nodes.

17. The computer program product for calculating a transmitted signal characteristic according to claim 15 wherein said signal characteristic is signal strength.

18. The computer program product for calculating a transmitted signal characteristic according to claim 15 wherein said object includes a panel.

19. The computer program product for calculating a transmitted signal characteristic according to claim 15 wherein said object includes a diffraction corner.

20. The computer program product for calculating a transmitted signal characteristic according to claim 15 wherein said object energized by said transmitter includes an object in an unobstructed path from said transmitter.

21. The computer program product for calculating a transmitted signal characteristic according to claim 15 wherein said threshold has a value equal to an ambient noise signal strength.