Quadrature imbalance mitigation using unbiased training...

H - Electricity – 04 – L

Patent

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H04L 27/26 (2006.01)

Patent

CA 2678126

A system and method are provided for transmitting an unbiased communications training sequence. The method generates an unbiased training sequence in a quadrature modulation transmitter. The unbiased training sequence represents a uniform accumulated power evenly distributed in the complex plane. As a result, training information in the time domain is sent via an in-phase (I) modulation path having an accumulated power. Training information in the time domain is sent via a quadrature (Q) modulation path having an accumulated power equal to the I modulation path power. Also provided are system and method for calculating an unbiased channel estimate from a received unbiased training sequence.

L'invention concerne un système et un procédé pour émettre une séquence d'apprentissage de communications sans biais. Le procédé génère une séquence d'apprentissage sans biais dans un émetteur à modulation à quadrature. La séquence d'entraînement sans biais représente une puissance accumulée uniforme répartie de façon régulière dans le plan complexe. Par suite, des informations d'apprentissage dans le domaine temporel sont envoyées via un trajet de modulation en phase (I), ayant une puissance accumulée. Des informations d'apprentissage dans le domaine temporel sont envoyées via un trajet de modulation en quadrature (Q) ayant une puissance accumulée égale à la puissance du trajet de modulation I. L'invention concerne également un système et un procédé pour calculer une estimation de canal sans biais à partir d'une séquence d'apprentissage sans biais reçue.

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