Methods and apparatus for accurately determining signal time...

Details Methods and apparatus for accurately determining signal time... Methods and apparatus for accurately determining signal time...

2009-05-29

2011-10-18

Vuong, Quochien B (Department: 2618)

Telecommunications

Radiotelephone system

Emergency or alarm communication

C455S456100, C375S142000, C375S150000, C375S343000

Reexamination Certificate

active

08041336

ABSTRACT:
A technique for determining the time of arrival of a signal involves correlating a received signal with a correlation function to produce a stream of correlation samples including a peak sample, pre-peak samples, and post-peak samples. A curve matching table includes sets of values, where each set of values represents discrete points of a correlation function having a peak at a respective different time shift relative to the timing of the peak sample. The sets of values include first sets of values that are matched with a first set of samples having no post-peak samples from the correlation samples, and second sets of values that are matched with a second set of samples having at least one post-peak sample. The time of arrival of the signal is determined from the timing of the peak of the correlation function represented by the set of values that produces the best match.

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European Search Report dated Sep. 2, 2010 cited in Application No. 10161703.3-1248.

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