Digital broadcast receiver

Details Digital broadcast receiver Digital broadcast receiver

1998-03-20

2000-11-21

Chin, Stephen

Pulse or digital communications

Receivers

Angle modulation

H04L 2722

Patent

active

061513695

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 to obtain an array of complex values, selects several sets of values from the array, multiplies each selected value by the complex conjugate of a value offset by N positions in the array (where N is a fixed integer that may be equal to zero), averages the results in each set, takes differences between the average values, or between sums of these average values, thereby obtains two difference values, and calculates a frequency offset from the difference values. Each set of values is taken from positions at which the known reference-symbol values satisfy certain conditions in relation to the known values at adjacent positions.

REFERENCES:
patent: 5970397 (1999-10-01), Klank et al.

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