Bandpass phase tracker with hilbert transformation before plural

Details Bandpass phase tracker with hilbert transformation before plural Bandpass phase tracker with hilbert transformation before plural

1997-07-10

1999-11-09

Pham, Chi H.

Pulse or digital communications

Receivers

Angle modulation

375321, 375316, H04L 2714

Patent

active

059828200

ABSTRACT:
The tuner in a digital TV receiver converts received signal to a penultimate intermediate-frequency signal. Penultimate local oscillations are supplied in a first phasing and in a second phasing in quadrature therewith, for heterodyning with the penultimate IF signal in first and second mixers respectively to generate real and imaginary components of an ultimate intermediate-frequency signal. The first and second mixers are of a switching type, switching in respective response to the penultimate local oscillations as supplied in first and in second phasing. First analog-to-digital conversion circuitry containing a number N of analog-to-digital converters digitizes the real component of the ultimate IF signal on an N-phase basis, N being at least one. Second analog-to-digital conversion circuitry, which contains a number N of analog-to-digital converters, digitizes the imaginary component of the ultimate IF signal on an N-phase basis. A complex digital carrier signal is generated at the frequency of the radio carrier wave as translated to the ultimate IF signal band. Synchrodyning circuitry responds to the complex digital carrier signal supplied as ultimate local oscillations, and to the digital samples of the real and imaginary components of the ultimate IF signal, for recovering in-phase and quadrature-phase components of baseband signal.

REFERENCES:
patent: 5418815 (1995-05-01), Ishikawa et al.
patent: 5602835 (1997-02-01), Seki et al.
patent: 5646935 (1997-07-01), Ishikawa et al.
patent: 5841814 (1995-10-01), Cupo

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