Method for frequency environment modeling and characterization

• US 6,175,811 B1
• Filed: 12/04/1997
• Issued: 01/16/2001
• Est. Priority Date: 12/04/1997
• Status: Expired due to Term

• Current Assignee: WSOU Investments, LLC (WSOU Holdings, LLC)
• Original Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: Tekinay, Sirin
• Primary Examiner(s): Wells, Kenneth B.
• Assistant Examiner(s): NGUYEN, LINH M
• Application Number:
  US08/984,779
• Time in Patent Office: 1,139 Days
• Field of Search: 702/71, 333/142, 333/145, 361/818, 361/618, 395/500.23
• US Class Current: 702/71
• CPC Class Codes: H04B 17/391 Modelling the propagation channel

Abstract

The present invention provides an RF model that characterizes the scattering hostility in an RF environment through a set of parameters. The parameters essentially provide a description of the amount of multipath that an RF signal would incur if it were to travel in the RF environment. Thus, such an RF model can be used to predict the amount of signal degradation that a given RF signal would experience when transmitted from any point in the RF environment. As a result, the RF model can be used to determine whether a given RF signal, if transmitted from a given point in an RF environment, could be received by a receiver located at another point in the RF environment. Advantageously, the RF model can characterize the scattering hostility in an RF environment without being programmed with volumes of environmental information.

Claims

1. A method for determining the scattering characteristics of a radio frequency environment, comprising the steps of:

producing a wavelet representation of an incoming signal; and

comparing the wavelet representation of the incoming signal with an expected wavelet representation of the incoming signal to produce a measure of the number of multipath components in the incoming signal.

2. The method of claim 1, wherein the step of producing the wavelet representation of the incoming signal comprises passing the incoming signal through at least one filter.

3. The method of claim 2, wherein the incoming signal is passed through at least one linear filter.

4. The method of claim 2, wherein the incoming signal is passed through a series of linear filters.

5. The method of claim 1, wherein the step of comparing comprises determining whether corresponding wavelets in the wavelet representation of the incoming signal and the expected wavelet representation of the incoming signal match.

6. The method of claim 5, wherein the step of comparing comprises comparing a number of matching corresponding wavelets to a threshold.

7. The method of claim 5, wherein the step of determining whether corresponding wavelets match comprises determining whether dilations of corresponding wavelets are within a predetermined tolerance.

8. The method of claim 7, wherein the step of comparing comprises comparing a number of matching corresponding wavelets to a threshold.

9. The method of claim 5, wherein the step of determining whether corresponding wavelets match comprises determining whether scalings of corresponding wavelets are within a predetermined tolerance.

10. The method of claim 5, wherein the step of comparing comprises comparing a number of matching corresponding wavelets to a threshold.