Method of estimating signal-to-noise ratio, method of...

H - Electricity – 04 – L

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H04L 1/00 (2006.01) H04L 27/26 (2006.01) H04B 17/00 (2006.01)

Patent

CA 2659878

A method of estimating a signal-to-noise ratio by considering user mobility, a method of adjusting feedback information transmission, an adaptive modulation and coding method using the same, and a transceiver thereof are disclosed. The present invention includes measuring a first channel parameter and a second channel parameter using first and second symbols sequentially received, respectively, estimating a channel quality considering a time delay between measurements of the first and second channel parameters using the first and second channel parameters, and transmitting information for the estimated channel quality if a variation of the first and second channel parameters is equal to or greater than a prescribed threshold. Accordingly, the present invention reduces performance degradation and feedback overhead caused by a time delay in channel quality estimation.

L'invention concerne un procédé d'estimation d'un rapport signal-bruit prenant en compte la mobilité de l'utilisateur, un procédé d'ajustement de la transmission d'informations rétroactives, une modulation adaptive et procédé de codage utilisant cette dernière, et un émetteur-récepteur. La présente invention comprend la mesure d'un premier paramètre canal et un second paramètre canal utilisant respectivement un premier et un second symboles de réception séquentielle, l'estimation de la qualité canal en prenant en compte un retard entre les mesures du premier et du second paramètre canal, et la transmission des informations de la qualité canal estimée si une variation du premier et du second paramètre canal est égale ou supérieure à un seuil prescrit. En conséquence, la présente invention réduit la dégradation des performances et la perte par rétroaction due à un retard de l'estimation de la qualité canal.

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