Claims
- 1. A system for determining signal time of arrival in a wireless communication system, comprising:
a searcher to analyze received signals to determine a correlation signal level at predetermined points in time, the searcher determining a maximum signal level at a selected one of the predetermined points in time; and a modeling processor to generate a mathematical model of a predetermined response function using the maximum signal level and correlation signal levels from predetermined points in time adjacent the selected time, the modeling processor using the mathematical model to determine a time associated with a peak correlation signal level. Correlation Signal Levels are RSSI
- 2. The system of claim 1 wherein the correlation signal levels are based on received signal strength of the received signals.
- 3. The system of claim 1 wherein the maximum signal level and correlation signal levels from predetermined points in time adjacent the selected time are used to determine coefficients in the mathematical model.
- 4. The system of claim 3 wherein the coefficients in the mathematical model are used to determine the time associated with a peak value of the mathematical model.
- 5. The system of claim 1 wherein the mathematical model is a second-order mathematical function.
- 6. The system of claim 1 wherein the mathematical model is a second-order mathematical function with three coefficients, the maximum signal level and two correlation signal levels from predetermined points in time adjacent the selected time being used to determine the three coefficients in the mathematical model.
- 7. The system of claim 1 wherein the mathematical model is a quadratic function having the form: y(x)=ax2+bx+c.
- 8. The system of claim 7 wherein the maximum signal level and correlation signal levels from predetermined points in time adjacent the selected time are used to determine coefficients in the mathematical model.
- 9. The system of claim 8 wherein the coefficients in the mathematical model are used to determine a time associated with a peak value of the mathematical model.
- 10. The system of claim 1 wherein the mathematical model is a mathematical function greater than a second order, the maximum signal level and correlation signal levels from predetermined points in time adjacent the selected time being used to determine coefficients in the mathematical model.
- 11. A system for determining signal time of arrival in a wireless communication system, comprising:
analysis means for analyzing received signals to determine a correlation signal level at predetermined points in time and for determining a maximum signal level at a selected one of the predetermined points in time; and modeling means for generating a mathematical model of a predetermined response function using the maximum signal level and correlation signal levels from predetermined points in time adjacent the selected time, the mathematical model being used to determine a time associated with a peak correlation signal level. Correlation Signal Levels are RSSI
- 12. The system of claim 11 wherein the correlation signal levels are based on received signal strength of the received signals.
- 13. The system of claim 11 wherein the modeling means uses the maximum signal level and correlation signal levels from predetermined points in time adjacent the selected time to determine coefficients in the mathematical model.
- 14. The system of claim 13 wherein the coefficients in the mathematical model are used to determine the time associated with a peak value of the mathematical model.
- 15. The system of claim 11 wherein the modeling means uses a second-order mathematical function as the mathematical model.
- 16. The system of claim 11 wherein the modeling means uses a mathematical model greater than a second order.
- 17. A method for determining signal time of arrival in a wireless communication system, comprising:
analyzing received signals to determine a correlation signal level at predetermined points in time; determining a maximum signal level at a selected one of the predetermined points in time; generating a mathematical model of a predetermined response function using the maximum signal level and correlation signal levels from predetermined points in time adjacent the selected time; and using the mathematical model to determine a time associated with a peak correlation signal level. Correlation Signal Levels are RSSI
- 18. The method of claim 17 wherein the correlation signal levels are based on received signal strength of the received signals.
- 19. The method of claim 17 wherein the maximum signal level and correlation signal levels from predetermined points in time adjacent the selected time are used to determine coefficients in the mathematical model.
- 20. The method of claim 19 wherein the coefficients in the mathematical model are used to determine the time associated with a peak value of the mathematical model.
- 21. The method of claim 17 wherein the mathematical model is a second-order mathematical function.
- 22. The method of claim 21 wherein coefficients in the second-order mathematical function are used to determine the time associated with a peak value of the mathematical model.
- 23. The second-order mathematical function of claim 17 wherein the mathematical model is a mathematical function greater than a second order, the maximum signal level and correlation signal levels from predetermined points in time adjacent the selected time being used to determine coefficients in the mathematical model.
RELATED APPLICATIONS
[0001] This application claims priority to U.S. Provisional Application No. 60/340,189 filed on Dec. 14, 2001.
Provisional Applications (1)
|
Number |
Date |
Country |
|
60340189 |
Dec 2001 |
US |