A REAL TIME METHOD FOR MEASURING THE RICEAN K FACTOR.

摘要

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.