Pulse or digital communications – Receivers – Automatic frequency control
Patent
1996-07-12
1998-09-15
Pham, Chi H.
Pulse or digital communications
Receivers
Automatic frequency control
4551923, 4551922, H04L 2706
Patent
active
058090886
ABSTRACT:
A digital carrier wave restoring device for use in a telecommunication receiving system which utilizes a pilot signal: frequency-converts an output signal of a filter to a digital signal processing frequency band; phase-splits the digital signal to output a first I signal and a first Q signal; low-pass filters and phase-splits the digital signal to output a second I signal and a second Q signal; mixes the first I signal and the first Q signal with a fixed local oscillation frequency to output a first I signal and a first Q signal of a baseband; mixes the second I signal and the second Q signal with the fixed local oscillation frequency to output a second I signal and a second Q signal of a baseband; and detects a frequency error and a phase error to generate an error correction value for correcting the frequency error and the phase error, and for applying to a tuning unit a second tuning frequency which is obtained by adding a preliminary correction frequency value to the error correction value, to thereby cause the tuning unit to correct a first tuning frequency.
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Bayard Emmanuel
Pham Chi H.
Samsung Electronics Co,. Ltd.
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