A real-time method for measuring the ricean k-factor

H - Electricity – 04 – B

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H04B 17/00 (2006.01) H04B 7/005 (2006.01)

Patent

CA 2399385

A system and method for measuring the Ricean K-factor of a wireless channel in real time. An amplitude sample of a transmitted RF waveform of either fixed or varying amplitude is low-pass filtered to eliminate high frequency noise if present. The magnitude squared of the filtered sample amplitude is squared to obtain the power gain of the sample and the magnitude squared of the power gain is computed. The sums of a window of power gains and the sum of the squares of the power gains are then updated. These sums of the window of amplitude samples are then averaged to estimate the first and second moments of the window of samples. The averages are low-pass filtered to minimize fluctuations. The final average is input to a moment-based set of Greenstein-Michelson-Erceg (GME) equations to obtain estimates for the time average of the power gain and rms deviation of the power gain. The K-factor is calculated in accordance with these equations and low-pass filtered to smooth the result.

L'invention concerne un système et un procédé de mesure en temps réel du facteur K d'un canal sans fil. Un échantillon de l'amplitude d'une forme d'onde RF émise, d'amplitude fixe ou variable, subit un filtrage passe-bas en vue de l'élimination de l'éventuel bruit haute fréquence. Le carré de l'amplitude de l'échantillon filtré est élevé au carré afin d'obtenir le gain en puissance de l'échantillon, le carré de l'amplitude du gain en puissance étant calculé. Les sommes d'une fenêtre de gains en puissance et la somme des carrées desdits gains sont ensuite mises à jour. On calcule ensuite la moyenne de ces sommes de la fenêtre d'échantillons d'amplitude afin d'estimer le premier et le second moment de la fenêtre d'échantillons. Les moyennes subissent un filtrage passe-bas permettant de minimiser les fluctuations. La moyenne finale est ensuite introduite dans un système d'équations de Greenstein-Michelson-Erceg (GME) basées sur le moment, et ce afin d'obtenir des estimations du temps moyen du gain en puissance et de la dispersion quadratique dudit gain. On calcule le facteur K d'après ces équations et on le soumet à un filtrage passe-bas afin de lisser le résultat.

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