Carrier regenerating circuit, multi-level quadrature amplitude d

Details Carrier regenerating circuit, multi-level quadrature amplitude d Carrier regenerating circuit, multi-level quadrature amplitude d

1997-11-04

2000-03-21

Pham, Chi H.

Pulse or digital communications

Receivers

Angle modulation

375344, 329304, H04L 2714, H04L 2706

Patent

active

06041085&

ABSTRACT:
Level-holding circuits 16, 17 sample and hold the output of quadrature detecting circuit 11 at adjoining apertures of eye patterns of demodulated multi-level QAM signal components and at the middle point of the adjoining apertures, respectively. Thus, location information on a phase plane of demodulated signal such as (I0, Q0), (I1, Q1), and (I1/2, Q1/2) are obtained. Frequency deviation detecting circuit 18 calculates the amplitude and the direction of the frequency deviation of regenerated carrier based on the location information. The output of frequency deviation detecting circuit 18 is added to phase error signal in synthesizing circuit 20. The result of addition is applied to VCO 15.

REFERENCES:
patent: 4622683 (1986-11-01), Basham et al.
patent: 5440268 (1995-08-01), Taga et al.
patent: 5602835 (1997-02-01), Seki et al.
patent: 5872812 (1999-02-01), Saito et al.
patent: 5872815 (1999-02-01), Strolle et al.

Affiliated with

Also associated with

Rating

Carrier regenerating circuit, multi-level quadrature amplitude d does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Carrier regenerating circuit, multi-level quadrature amplitude d, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Carrier regenerating circuit, multi-level quadrature amplitude d will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-736295