Carrier recovery circuit

Details Carrier recovery circuit Carrier recovery circuit

1996-03-06

2000-09-26

Tse, Young T.

Pulse or digital communications

Receivers

Angle modulation

375232, H04L 2722

Patent

active

061251518

ABSTRACT:
The invention provides a carrier recovery circuit which reduces the amount of calculation processing recovered to renew the tap coefficients of an adaptive filter to achieve improvement performance at low signal-to-noise ratio and make high speed pull in possible. Tap coefficients of variable coefficient filter 12 of adaptive line enhancer 1 are blocked into a plurality of blocks, and switches of switch circuit 14 individually corresponding to the blocks are selected by coefficient renewal control circuit 3 and renewal of the tap coefficients of the selected block is executed by adaptive algorithm circuit 13. Since all tap coefficients need not necessarily be renewed at a time in each symbol cycle, only the tap coefficients of the selected block are renewed. Thus although the adaptive speed of the adaptive emission line emphasizer decreases, the adaptive line enhancer can be constructed with a narrower band. Further, by varying the number of blocks to be selected in response to frame synchronizing information, prior to establishment of frame synchronization the number of blocks to be selected can be reduced and high speed pull in is realized.

REFERENCES:
patent: 3716807 (1973-02-01), Sha et al.
patent: 5090027 (1992-02-01), Ohsawa
patent: 5327459 (1994-07-01), Hara et al.
patent: 5414732 (1995-05-01), Kaufmann
patent: 5477534 (1995-12-01), Kusano
patent: 5590121 (1996-12-01), Geigel
The Institution of Electrical Engineers, Electronic Circuits and Systems, vol. 133, 1986.
European Search Report.
"Adaptive Noise Cancelling: Principles and Applications", B. Widrow et al, Proceedings of the IEEE, vol. 63, No. 12, Dec. 1975.

Affiliated with

Also associated with

Rating

Carrier recovery circuit 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 recovery circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Carrier recovery circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2106579