Determination of a code phase

Details Determination of a code phase Determination of a code phase

2004-12-22

2009-02-03

Tse, Young T. (Department: 2611)

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

C375S150000, C342S357490, C342S357490

Reexamination Certificate

active

07486749

ABSTRACT:
The invention relates to determining a correct code phase of a received, code modulated carrier signal using a correlation portion, a frequency compensation portion, a coherent memory and a non-coherent memory. In order to compensate for a code Doppler effect and/or a carrier Doppler drift effect, a mapping portion maps correlation values either to the coherent memory or to the non-coherent memory. Alternatively, the mapping portion maps correlation values stored in the coherent memory or in the non-coherent memory to new positions. The mapping depends on a frequency compensation applied by the frequency compensation portion and elapsed integration time, and/or on a drift of a frequency offset in correlation values output by the correlation portion.

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