Phase detecting method and phase tracking loop circuit for a dig

Details Phase detecting method and phase tracking loop circuit for a dig Phase detecting method and phase tracking loop circuit for a dig

1997-10-02

2000-09-05

Chin, Stephen

Pulse or digital communications

Receivers

Angle modulation

375326, 375329, 375344, 329304, H04L 2722, H04L 2714

Patent

active

061154318

ABSTRACT:
A phase detecting method and associated apparatus for use in a digital vestigial sideband modulation communication device. The phase detecting method has the steps of: digital-filtering I channel data applied from the exterior to restore Q channel data; compensating for a phase of the I and Q channel data by a prescribed phase error value; estimating an I channel level value which approximates the I channel data from the phase-compensated I channel data; and obtaining a difference between the phase-compensated I channel data and the estimated I channel level value, and generating as the phase error value an operation value obtained by multiplying the difference by a sign of the Q channel data.

REFERENCES:
patent: 5406587 (1995-04-01), Horwitz et al.
patent: 5533070 (1996-07-01), Krishnamurthy et al.
patent: 5533071 (1996-07-01), Krishnamurthy et al.
patent: 5602601 (1997-02-01), Kim et al.
patent: 5796786 (1998-08-01), Lee
patent: 5933460 (1999-08-01), Lee

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