Carrier frequency detection for signal acquisition

Details Carrier frequency detection for signal acquisition Carrier frequency detection for signal acquisition

2008-02-25

2010-11-30

Fan, Chieh M (Department: 2611)

Pulse or digital communications

Receivers

Angle modulation

C375S324000

Reexamination Certificate

active

07844017

ABSTRACT:
A carrier frequency in a filtered received M-ary phase-shift keyed (MPSK) modulated signal having in-phase and quadrature components is detected by processing the filtered received signal to remove modulation components and thereby generate a test signal at the carrier frequency; processing the test signal to provide an amplitude spectrum of samples at different test frequencies; and processing the amplitude spectrum to detect the carrier frequency in accordance with the test frequency at which there is a test statistic of the highest magnitude. The magnitude of the test statistic is determined by processing a signal statistic in relation to a noise statistic. The signal statistic is the amplitude of the largest-amplitude sample. The filtered received signal is processed to provide approximate values of the modulus of the received signal and the phase of the received signal; and the approximate modulus and phase values are processed to generate the test signal.

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