System and method for automated link quality measurement for...

H - Electricity – 04 – L

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H04L 1/00 (2006.01) H04L 1/20 (2006.01)

Patent

CA 2695642

A communications system includes a transmitter that transmits a modulated signal having encoded communications data over a communications channel. The transmitter adjusts one of at least modulation and coding at the transmitter based on the received channel state information of the transmitted signal. A receiver determines received signal metrics from the modulated signal. A noise power estimator estimates the noise power of the received communications signal by collecting N data samples from the communications signals, forming a covariance matrix of the N data samples based on a model order estimate, computing the eigenvalue decomposition of the covariance matrix and ranking resultant eigenvalues from the minimum to the maximum for determining the noise power of the received signal. At least one of modulation and coding are adjusted based on the monitored link quality of the communications channel to enhance use of the available channel capacity.

L'invention concerne un système de communication comprenant un émetteur destiné à émettre un signal modulé contenant des données de communication codées sur un canal de communication. L'émetteur règle la modulation ou le codage en fonction des informations d'état de canal reçues du signal transmis. Un récepteur détermine les mesures de signal reçues du signal modulé. Un estimateur de puissance de bruit estime la puissance du bruit du signal de communication reçu par collecte de N échantillons de données des signaux de communication, par formation d'une matrice de covariance des N échantillons de données en fonction d'une estimation d'ordre de modèle, par calcul de la décomposition en valeurs propres de la matrice de covariance et par classement des valeurs propres obtenues par ordre croissant pour déterminer la puissance du bruit du signal reçu. Au moins la modulation ou le codage sont réglés en fonction de la qualité de liaison surveillée du canal de communication afin d'améliorer l'utilisation de la capacité de canal disponible.

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