Method and apparatus for compensating for phase noise of...

H - Electricity – 04 – B

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H04B 1/707 (2006.01)

Patent

CA 2601362

A method and apparatus for compensating for phase noise of symbols spread with a long spreading code are disclosed. To compensate for the phase noise, a phase error estimate is generated from despread symbols with a short spreading code. A phase correcting phasor is applied to chip rate data before despreading the data with a long spreading code. A signal-to-interference ratio (SIR) on a common pilot channel (CPICH) may be calculated by spreading the data with a parent spreading code in an orthogonal variable spreading factor (OVSF) code tree and by combining symbols. Alternatively, a magnitude of the symbols may be used in estimating the SIR. The SIR of a channel using a short spreading code and an SIR of a channel using a long spreading code are measured. The SIR of the channel with the long spreading code may be compensated in accordance with a difference between degradation of the SIRs.

L'invention concerne un procédé et un dispositif permettant de compenser le bruit de phase de symboles étalés au moyen d'un long code d'étalement. A cette fin, on génère une estimation d'erreur de phase à partir de symboles désétalées avec un code d'étalement court On applique un vecteur de phase aux données de débit d'éléments avant de désétaler les données au moyen d'un long code d'étalement. On peut calculer un rapport signal/brouillage (SIR) sur un canal pilote commun (CPICH) en étalant les données avec un code d'étalement parent dans un arbre de codage à facteur d'étalement variable orthogonal (OVSF) et en combinant les symboles. En variante, il est possible d'utiliser l'amplitude des symboles pour l'estimation du rapport signal/brouillage (SIR), On mesure un SIR d'un canal au moyen d'un code d'étalement court et un SIR de canal au moyen d'un code d'étalement long. Le SIR du canal avec le code d'étalement long peut être compensé selon la différence de dégradation des SIR.

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