H - Electricity – 03 – D
Patent
H - Electricity
03
D
329/18
H03D 3/00 (2006.01) H04L 27/227 (2006.01)
Patent
CA 1274003
"Carrier Recovery Circuitry Immune to Interburst Frequency Variations" ABSTRACT OF THE DISCLOSURE A carrier recovery circuit comprises first and second mixers for mixing a received PSK signal with first and second reference frequency signals. A remodulator extracts a preamble from each burst of the PSK signal and supplies the extracted carrier to a carrier recovery means to cause it to derive a reference carrier from the extracted preamble. A phase detector is connected to the outputs of the first and second mixers for detecting a phase difference between the PSK signal and the reference carrier, the detected phase difference being applied to a resettable noise reduction circuit for reducing amplitude fluctuations contained in the phase difference, the noise reduction circuit being arranged to be reset in response to each of the bursts to discharge energy stored as a result of the noise reduction and eliminate interburst phase errors which occur as a result of interburst frequency variations. A variable phase shifter controls the phase of the reference carrier in accordance with the output of the noise eliminator and supplies quadrature versions of the phase controlled carrier to the first and second mixers as the first and second reference frequency signals.
544991
Otani Susumu
Tanimoto Yoshio
Yoshida Shousei
Corporation Nec
Smart & Biggar
LandOfFree
Carrier recovery circuitry immune to interburst frequency... 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 circuitry immune to interburst frequency..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Carrier recovery circuitry immune to interburst frequency... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1192685