Apparatus and method for acquiring spread-spectrum signals

Details Apparatus and method for acquiring spread-spectrum signals Apparatus and method for acquiring spread-spectrum signals

2004-05-17

2008-12-30

Liu, Shuwang (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S130000, C375S140000, C375S147000, C370S320000, C370S335000, C370S342000, C370S441000, C370S479000

Reexamination Certificate

active

07471717

ABSTRACT:
An apparatus for acquiring spread-spectrum signals includes a mixer for generating an in-phase signal and a quadrature signal from the spread-spectrum signal, a decimator for subsampling the in-phase signal and the quadrature signal, a correlation engine for producing an in-phase correlation between the subsampled in-phase signal and a PN code and producing a quadrature correlation between the subsampled quadrature signal and the PN code, a first coherent integrator for accumulating a plurality of in-phase correlations to produce an in-phase coherent integration, a second coherent integrator for accumulating a plurality of quadrature correlations to produce a quadrature coherent integration, an incoherent integrator for accumulating the in-phase coherent integrations and the quadrature coherent integrations to produce an incoherent integration, and a signal detector for checking the presence of the spread-spectrum signal based on the incoherent integration.

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