WAVEFORM CORRELATION RESULT PROCESSING METHODS AND APPARATUSES

• US 20100153040A1
• Filed: 12/12/2008
• Published: 06/17/2010
• Est. Priority Date: 12/12/2008
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Pon, Rayman Wai
• Granted Patent: US 8,200,446 B2
• Time in Patent Office: Days
• US Class Current: 702/66
• CPC Class Codes: G01S 19/22 Multipath-related issues

Abstract

Methods and apparatus are provided for use in devices adapted to perform waveform correlation result processing. An exemplary method may include accessing a plurality of collected measurement values stored in memory, establishing at least one combined measurement value based, at least in part, on at least two of the collected measurement values, and identifying at least one wireless signal within a reference waveform based, at least in part, on at least the combined measurement value. The method may also include establishing the at least one correlation result for at least one of the plurality of waveforms by correlating the at least one of the plurality of waveforms with the reference waveform.

Claims

1. A method comprising:

accessing a plurality of collected measurement values stored in memory, each of said plurality of collected measurement values being associated with at least one correlation result for a different waveform selected from a corresponding plurality of waveforms;

establishing at least one combined measurement value based, at least in part, on at least two of said plurality of collected measurement values; and

identifying at least one wireless signal within a reference waveform based, at least in part, on at least said combined measurement value.

2. The method as recited in claim 1, further comprising establishing said at least one correlation result for at least one of said plurality of waveforms by correlating said at least one of said plurality of waveforms with said reference waveform.

3. The method as recited in claim 1, further comprising arithmetically establishing at least one of said plurality of collected measurement values based, at least in part, on one or more correlation results associated with at least one of said plurality of waveforms.

4. The method as recited in claim 3, wherein arithmetically establishing said at least one of said plurality of collected measurement values comprises:

summing said correlation results to establish an intermediate summation value; and

squaring said intermediate summation value to establish a collected measurement value.

5. The method as recited in claim 3, wherein arithmetically establishing said at least one of said plurality of collected measurement values comprises adding or subtracting at least a portion at least a first collected measurement value to or from at least a portion of a second collected measurement value.

6. The method as recited in claim 3, wherein establishing said at least one combined measurement value comprises:

establishing an intermediate product value by multiplying said at least two of said plurality of collected measurement values;

establishing an intermediate square root value by taking a square root of said intermediate product value; and

at least one of;

adding or subtracting at least a portion of said intermediate square root value to or from at least a portion of at least one collected measurement value, and/or

adding or subtracting at least a portion of said intermediate square root value to or from at least a portion of at least one other intermediate square root value.

7. The method as recited in claim 1, wherein identifying at least one wireless signal within a reference waveform comprises:

performing a tracking operation based, at least in part, on said combined measurement value.

8. The method as recited in claim 7, wherein performing said tracking operation based, at least in part, on said combined measurement value comprises:

initiating an establishment of at least one other combined measurement value based, at least in part, on at least a subset of said plurality of collected measurement values; and

performing a subsequent tracking operation based, at least in part, on said at least one other combined measurement value.

9. The method as recited in claim 1, further comprising:

receiving said reference waveform; and

generating at least a portion of said plurality of waveforms based, at least in part, on a local code waveform.

10. The method as recited in claim 1, wherein said plurality of waveforms comprises at least one of a local code waveform, a replica waveform, and/or a combined waveform.

11. The method as recited in claim 1, wherein said at least one wireless signals comprises a satellite positioning system (SPS) signal.

12. An apparatus comprising:

memory adapted to store a plurality of collected measurement values, each of said plurality of collected measurement values being associated with at least one correlation result for a different waveform selected from a corresponding plurality of waveforms; and

at least one processing unit operatively coupled to said memory and adapted to establish at least one combined measurement value based, at least in part, on at least two of said plurality of collected measurement values, and identify at least one wireless signal within a reference waveform based, at least in part, on at least said combined measurement value.

13. The apparatus as recited in claim 12, further comprising:

correlation circuitry operatively coupled to at least one of said memory and/or processing unit and adapted to establish said at least one correlation result for at least one of said plurality of waveforms by correlating said at least one of said plurality of waveforms with said reference waveform.

14. The apparatus as recited in claim 12, wherein said at least one processing unit is further adapted to establish at least one of said plurality of collected measurement values based, at least in part, on one or more correlation results associated with at least one of said plurality of waveforms.

15. The apparatus as recited in claim 14, wherein said at least one processing unit is further adapted to:

sum said correlation results to establish an intermediate summation value; and

square said intermediate summation value to establish a collected measurement value.

16. The apparatus as recited in claim 14, wherein said at least one processing unit is further adapted to add or subtract at least a portion at least a first collected measurement value to or from at least a portion of a second collected measurement value.

17. The apparatus as recited in claim 14, wherein said at least one processing unit is further adapted to:

establish an intermediate product value by multiplying said at least two of said plurality of collected measurement values;

establish an intermediate square root value by taking a square root of said intermediate product value; and

at least one of;

add or subtract at least a portion of said intermediate square root value to or from at least a portion of at least one collected measurement value, and/or

add or subtract at least a portion of said intermediate square root value to or from at least a portion of at least one other intermediate square root value.

18. The apparatus as recited in claim 12, wherein said at least one processing unit is further adapted to perform a tracking operation based, at least in part, on said combined measurement value.

19. The apparatus as recited in claim 18, wherein said at least one processing unit is further adapted to:

initiate an establishment of at least one other combined measurement value based, at least in part, on at least a subset of said plurality of collected measurement values; and

perform a subsequent tracking operation based, at least in part, on said at least one other combined measurement value.

20. The apparatus as recited in claim 12, further comprising receiver circuitry opertively coupled to at least one of said memory and/or said at least one processing unit and adapted to receive said reference waveform.

21. The apparatus as recited in claim 12, further comprising waveform generation circuitry opertively coupled to at least one of said memory and/or said at least one processing unit and adapted to generate said plurality of waveforms based, at least in part, on a local code waveform.

22. The apparatus as recited in claim 12, wherein said plurality of waveforms comprises at least one of a local code waveform, a replica waveform, and/or a combined waveform.

23. The apparatus as recited in claim 12, wherein said at least one wireless signals comprises a satellite positioning system (SPS) signal.

24. An apparatus comprising:

means for establishing a plurality of collected measurement values, each of said plurality of collected measurement values being associated with at least one correlation result for a different waveform selected from a corresponding plurality of waveforms;

means for establishing at least one combined measurement value based, at least in part, on at least two of said plurality of collected measurement values; and

means for identifying at least one wireless signal within a reference waveform based, at least in part, on at least said combined measurement value.

25. The apparatus as recited in claim 24, further comprising:

means for establishing said at least one correlation result for at least one of said plurality of waveforms by correlating said at least one of said plurality of waveforms with said reference waveform.

26. The apparatus as recited in claim 24, further comprising:

means for establishing at least one of said plurality of collected measurement values based, at least in part, on one or more correlation results associated with at least one of said plurality of waveforms.

27. The apparatus as recited in claim 24, further comprising:

means for initiating an establishment of at least one other combined measurement value based, at least in part, on at least a subset of said plurality of collected measurement values; and

28. The apparatus as recited in claim 24, further comprising:

means for performing a tracking operation based, at least in part, on said combined measurement value and/or on said at least one other combined measurement value.

29. The apparatus as recited in claim 24, further comprising means for receiving said reference waveform.

30. The apparatus as recited in claim 24, further comprising means for generating said plurality of waveforms based, at least in part, on a local code waveform.

31. The apparatus as recited in claim 24, wherein said plurality of waveforms comprises at least one of a local code waveform, a replica waveform, and/or a combined waveform.

32. The apparatus as recited in claim 24, wherein said at least one wireless signals comprises a satellite positioning system (SPS) signal.

33. A computer readable medium comprising computer implementable instructions stored thereon which if implanted by at least one processing unit adapt said at least one processing unit to:

access a plurality of collected measurement values, each of said plurality of collected measurement values being associated with at least one correlation result for a different waveform selected from a corresponding plurality of waveforms;

establish at least one combined measurement value based, at least in part, on at least two of said plurality of collected measurement values; and

identify at least one wireless signal within a reference waveform based, at least in part, on at least said combined measurement value.

34. The computer readable medium as recited in claim 33, comprising further computer implementable instructions, which if implanted by at least one processing unit adapt said at least one processing unit to establish at least one of said plurality of collected measurement values based, at least in part, on one or more correlation results associated with at least one of said plurality of waveforms.

35. The computer readable medium as recited in claim 34, comprising further computer implementable instructions, which if implanted by at least one processing unit adapt said at least one processing unit to:

sum said correlation results to establish an intermediate summation value; and

square said intermediate summation value to establish a collected measurement value.

36. The computer readable medium as recited in claim 34, comprising further computer implementable instructions, which if implanted by at least one processing unit adapt said at least one processing unit to add or subtract at least a portion at least a first collected measurement value to or from at least a portion of a second collected measurement value.

37. The computer readable medium as recited in claim 34, comprising further computer implementable instructions, which if implanted by at least one processing unit adapt said at least one processing unit to:

establish an intermediate product value by multiplying said at least two of said plurality of collected measurement values;

establish an intermediate square root value by taking a square root of said intermediate product value; and

at least one of;

add or subtract at least a portion of said intermediate square root value to or from at least a portion of at least one collected measurement value, and/or

add or subtract at least a portion of said intermediate square root value to or from at least a portion of at least one other intermediate square root value.

38. The computer readable medium as recited in claim 33, comprising further computer implementable instructions, which if implanted by at least one processing unit adapt said at least one processing unit to perform a tracking operation based, at least in part, on said combined measurement value.

39. The computer readable medium as recited in claim 38, comprising further computer implementable instructions, which if implanted by at least one processing unit adapt said at least one processing unit to:

initiate an establishment of at least one other combined measurement value based, at least in part, on at least a subset of said plurality of collected measurement values; and

perform a subsequent tracking operation based, at least in part, on said at least one other combined measurement value.

40. The computer readable medium as recited in claim 33, wherein said plurality of waveforms comprises at least one of a local code waveform, a replica waveform, and/or a combined waveform.

41. The computer readable medium as recited in claim 33, wherein said at least one wireless signals comprises a satellite positioning system (SPS) signal.