Phase error detecting method and phase tracking loop circuit

Details Phase error detecting method and phase tracking loop circuit Phase error detecting method and phase tracking loop circuit

1996-10-18

1998-08-18

Vo, Don N.

Pulse or digital communications

Receivers

Angle modulation

375340, 375344, 375346, 348607, 348639, 348726, 329304, H04L 2714

Patent

active

057967865

ABSTRACT:
A phase error detecting method is applied to a VSB receiver or a QAM receiver. Q-channel data is recovered by digitally filtering transmitted I-channel data, and the phases of the I-channel data and the Q-channel data are corrected according to a fed-back phase error. A decided I-channel level value is chosen approximating the phase-corrected I-channel data among predetermined reference I-channel level values. A phase error value for the received data is obtained by subtracting the decided I-channel level value from the phase-corrected I-channel data, and multiplying the sign of the difference by the difference itself, and applying a weight value from a predetermined weighting function to the phase error value weighted phase error value is fed back to be used for phase correction of received data. Thus, the reliability of phase error detection can be increased by use of the weighting function.

REFERENCES:
patent: 5406587 (1995-04-01), Horwitz et al.
patent: 5519356 (1996-05-01), Greenberg
patent: 5602601 (1997-02-01), Kim et al.

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