Method and apparatus for using adaptive threshold with...

Details Method and apparatus for using adaptive threshold with... Method and apparatus for using adaptive threshold with...

2005-11-15

2005-11-15

Le, Amanda T. (Department: 2634)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S150000, C375S343000, C370S210000

Reexamination Certificate

active

06965632

ABSTRACT:
A method and apparatus for initial acquisition using an adaptive threshold includes performing a sort operation of a plurality of full-length correlator outputs and updating the adaptive threshold. Partial-length correlator outputs are generated and compared with an adaptive threshold. If a partial-length correlator output for a particular PN sequence timing is greater than or equal to the adaptive threshold, a full-length correlator output for that PN sequence timing is generated. A sort operation of a plurality of full-length correlator outputs is performed, and sort results are used to update the adaptive threshold. If a partial-length correlator output for a particular PN sequence timing is less than the adaptive threshold, a full-length correlator output for that PN sequence timing is not generated.

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patent: 6798758 (2004-09-01), Chun et al.
Triska et al., Multiple Dwell Serial Search: Performance and Application to Direct Sequence Code Acquisition, Communications, IEEE Transactions on [legacy, pre—1988], vol.: 31 , Issue: 5 , May 1983, pp:650-659.

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