Carrier phase synchronization by reverse playback

H - Electricity – 04 – L

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

H04L 27/14 (2006.01) H03L 7/107 (2006.01) H04L 27/233 (2006.01) H03L 7/099 (2006.01) H04L 7/02 (2006.01) H04L 7/10 (2006.01) H04L 27/00 (2006.01)

Patent

CA 2272560

A digital demodulator (10) reads symbol samples into a memory buffer (38) that can be played forward and backward into a phase locked loop (48). During an initial non-data directed symbol timing estimating phase (56) the demodulator (10) achieves an approximate frequency synchronization and starts to achieve phase synchronization on an incoming stream of symbols. During a first forward readout pass (58) of stored samples, the phase locked loop(48) begins the frequency and phase convergence. During subsequent pass (60) using a reverse readout of stored samples, phase locked loop (48) continues to converge toward zero phase error. Then another forward pass (66), phase locked loop (48) achieves usable frequency and phase synchronization of carrier and begins valid data extraction.

L'invention concerne un démodulateur (10) numérique qui lit des échantillons de symboles et les charge dans une mémoire tampon (38) lisible en lecture avant et en lecture arrière dans une boucle à phase asservie (48). Au cours d'une phase d'évaluation (56) de synchronisation de symboles non orientés données, le démodulateur (10) effectue une synchronisation approximative de fréquences et commence à synchroniser en phase un train de symboles entrant. Au cours d'une première lecture avant (58) d'échantillons mémorisés, la boucle à phase asservie (48) commence à faire converger les fréquences et les phases. Au cours d'une lecture arrière (60) ultérieure des échantillons stockés, la boucle à phase asservie (48) continue la mise en convergence vers une erreur de phase nulle. Ensuite, une autre boucle à phase asservie (48), à lecture avant (66) synchronise les fréquences et les phases utilisables de la porteuse, et commence à extraire les données valables.

LandOfFree

Say what you really think

Search LandOfFree.com for Canadian inventors and patents. Rate them and share your experience with other people.

Rating

Carrier phase synchronization by reverse playback 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 phase synchronization by reverse playback, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Carrier phase synchronization by reverse playback will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFCA-PAI-O-1653553

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.