H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 27/14 (2006.01) H04L 7/04 (2006.01) H04L 27/22 (2006.01) H04L 27/233 (2006.01) H04L 27/00 (2006.01)
Patent
CA 2331675
A method and apparatus for determining initial carrier and symbol phase estimates in a burst mode digital communication system are described. In-phase and quadrature sample of a BPSK preamble are sampled to obtain correlation values (YE, YO, XE, XO). Next, sum (7, 9, 10) and differences (8, 11, 12) of the correlation values are obtained. Then the initial carrier phase estimate (TAUHAT) and the initial symbol phase estimate (TAUHAT) are obtained through application of an algorithm. The apparatus that implements the method consists of adders (9, 10, 11, 12, 16, 17), inverters (7, 8, 15), arc tangent look-up tables (13, 14) and divide by 2 logic units (18, 19).
La présente invention concerne un procédé et un dispositif permettant de déterminer des estimations de porteuse et de phase symbole initiales. Des échantillons phase et quadrature d'un préambule BPSK (manipulation par déplacement de fréquence bivalente) sont prélevés en vue de l'obtention de valeurs de corrélation (YE, YO, XE, XO). On calcule ensuite la somme (7, 9, 10) et les différences (8, 11, 12) des valeurs de corrélation. L'application d'un algorithme permet d'obtenir une estimation de la phase sur la porteuse initiale (TAUHAT). Le dispositif d'application de ce procédé comprend des circuits d'addition (9, 10, 11, 12, 16, 17), des circuits d'inversion (7, 8, 15), des tables de tangentes d'arc (13, 14) et des unités logiques de division par deux (18, 19).
Comsat Corporation
Gowling Lafleur Henderson Llp
Viasat Inc.
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