Claims
- 1. A parameter estimator comprising:
correlation logic for determining, using a dynamically variable search window, a correlation function representing the correlation between a signal and one or more shifted versions of an identification code within the search window; and analysis logic for analyzing the correlation function and estimating, responsive thereto, one or more parameter(s) relating to the signal.
- 2. The parameter estimator of claim 1 configured to dynamically determine the size and/or position of the search window responsive to a priori information regarding the signal.
- 3. The parameter estimator of claim 1 wherein the a priori information is provided from a source external to the estimator.
- 4. The parameter estimator of claim 3 wherein the a priori information is provided from a wireless communications system.
- 5. The parameter estimator of claim 1 wherein the a priori information relates to a previous search of the signal conducted by the parameter estimator.
- 6. The parameter estimator of claim 1 wherein the a priori information relates to general network characteristics.
- 7. The parameter estimator of claim 6 wherein the a priori information relates to an assumption that weaker signals occur later than stronger signals.
- 8. The parameter estimator of claim 1 wherein the identification code is a PN code.
- 9. A parameter estimator comprising:
correlation means for determining, using a dynamically variable search window, a correlation function representing the correlation between a signal and one or more shifted versions of an identification code; and analysis means for analyzing the correlation function and estimating, responsive thereto, one or more parameter(s) relating to the signal.
- 10. A method of estimating one or more parameter(s) of a signal using a dynamically variable search window comprising:
dynamically determining a search window responsive to a priori information regarding a signal; determining a correlation function representing the correlation between the signal and one or more shifted versions of an identification code within the dynamically determined search window; and estimating, responsive to the correlation function, one or more parameter(s) relating to the signal.
- 11. The method of claim 10 wherein the signal is a pilot signal.
- 12. The method of claim 10 wherein the identification code is a PN code.
- 13. The method of claim 10 wherein the one or more parameter(s) relating to the signal include a time of arrival (TOA) parameter.
- 14. The method of claim 13 wherein the one or more parameter(s) relating to the signal include a root mean squared error (RMSE) for the TOA parameter.
- 15. The method of claim 10 wherein the one or more parameter(s) for the signal include an Ec/I0 parameter.
- 16. The method of claim 10 wherein the size and/or placement of the search window are dynamically set responsive to a priori information regarding the signal.
- 17. The method of claim 10 wherein the a priori information is provided from a wireless communications system.
- 18. The method of claim 10 wherein the a priori information is provided from a previous search of the signal.
- 19. The method of claim 10 wherein the a priori information relates to general network characteristics.
- 20. The method of claim 19 wherein the a priori information relates to an assumption that weaker signals arrive later than stronger signals.
- 21. A method of estimating one or more parameter(s) of a signal using a dynamically variable search window comprising:
determining, using a first search window, a first correlation function representing the correlation between a signal and one or more shifted versions of an identification code within the first search window; attempting to estimate, responsive to the first correlation function, one or more parameter(s) relating to the signal; and if the attempt is unsuccessful:
determining, using a second search window which may differ from the first search window, a second correlation function representing the correlation between the signal and one or more shifted versions of the identification code within the second search window; and attempting to estimate, responsive to the second correlation function, the one or more parameter(s) relating to the signal.
- 22. The method of claim 21 wherein the signal is a pilot signal.
- 23. The method of claim 21 wherein the identification code is a PN code.
- 24. The method of claim 21 wherein the size of the second search window is smaller than that of the first search window.
- 25. The method of claim 21 wherein the size of the second search window is larger than that of the first search window.
- 26. The method of claim 21 wherein the position of the second search window is different from that of the first search window.
- 27. The method of claim 21 wherein the one or more parameter(s) include a time of arrival (TOA) parameter for the signal.
- 28. The method of claim 27 wherein the one or more parameter(s) include a root mean squared error (RMSE) for the TOA parameter.
- 29. The method of claim 21 wherein the one or more parameter(s) include an Ec/I0 parameter relating to the signal.
- 30. The method of claim 21 further comprising iterating until the one or more parameter(s) are estimated, or it is determined that the one or more parameter(s) cannot be estimated from the signal.
- 31. A method of estimating one or more parameter(s) of a signal using a dynamically variable search window comprising:
a step for dynamically determining, responsive to a priori information regarding a signal, a search window; a step for determining a correlation function representing the correlation between the signal and one or more shifted versions of an identification code within the dynamically determined search window; and a step for estimating, responsive to the correlation function, one or more parameter(s) relating to the signal.
- 32. A method of estimating one or more parameters of a signal using a dynamically variable search window comprising:
a step for determining, using a first search window, a first correlation function representing the correlation between a signal and one or more shifted versions of an identification code within the first search window; a step for attempting to estimate, responsive to the first correlation function, one or more parameter(s) relating to the signal; and if the attempt is unsuccessful:
a step for determining, using a second search window which may differ from the first search window, a second correlation function representing the correlation between the signal and one or more shifted versions of the identification code within the second search window; and a step for attempting to estimate, responsive to the second correlation function, the one or more parameter(s) relating to the signal.
- 33. The methods of any of claims 10, 21, 31 or 32, tangibly embodied as a series of instructions stored in a processor readable medium.
- 34. The methods of any of claims 10, 21, 31 or 32, tangibly embodied as a series of instructions stored on a server.
- 35. The parameter estimator of any of claims 1 or 7 in a wireless communications device.
- 36. The logic of claim 33 within a wireless communications device.
RELATED APPLICATIONS
[0001] This application claims priority to U.S. Provisional Application No. 60/336,187, filed on Oct. 29, 2001.
Provisional Applications (1)
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Number |
Date |
Country |
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60336187 |
Oct 2001 |
US |