Digital broadcast receiver

Details Digital broadcast receiver Digital broadcast receiver

1997-05-21

2000-02-22

Pham, Chi H.

Pulse or digital communications

Receivers

Automatic frequency control

375260, 329304, 4551822, H04L 2706

Patent

active

060289007

ABSTRACT:
To control the oscillation frequency of a local oscillator, a digital broadcast receiver demodulates a phase-reference symbol contained in an orthogonal frequency-division multiplexed broadcast signal, modifies the resulting frequency-domain data by multiplication with complex conjugates of known data encoded in the phase-reference signal, under different assumed frequency offsets, converts the modified data to time-domain data, and thereby detects a first frequency error equal to a multiple of the subcarrier spacing and a second frequency error not exceeding the subcarrier spacing. Differential phase error is also detected. The oscillation frequency is adjusted to correct the first frequency error and differential phase error; then the second frequency error is used to correct for ambiguity in the differential phase error.

REFERENCES:
patent: 5191576 (1993-03-01), Pommier et al.
patent: 5239400 (1993-08-01), Liu
patent: 5444697 (1995-08-01), Leung et al.
patent: 5471464 (1995-11-01), Ikeda
patent: 5790784 (1998-08-01), Beale et al.

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