The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 15, 2005
Filed:
Feb. 06, 2001
Eamonn Gormley, Seattle, WA (US);
Jose Rodriguez-sanchez, Seattle, WA (US);
Eamonn Gormley, Seattle, WA (US);
Jose Rodriguez-Sanchez, Seattle, WA (US);
Clearwire Corporation, Kirkland, WA (US);
Abstract
A system and method for measuring the Ricean K-factor of a wireless channel in real time are provided. An amplitude sample of a transmitted RE 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.