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    • 5. 发明授权
    • Real-time system for measuring the Ricean K-factor
    • 用于测量Ricean K系数的实时系统
    • US06868120B2
    • 2005-03-15
    • US09777783
    • 2001-02-06
    • Eamonn GormleyJose Rodriguez-Sanchez
    • Eamonn GormleyJose Rodriguez-Sanchez
    • H04B7/005H04B17/00
    • H04B7/005H04B17/309
    • 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.
    • 提供了一种用于实时测量无线信道的赖斯K因子的系统和方法。 固定或变化幅度的发射RE波形的振幅采样被低通滤波,以消除高频噪声(如果存在)。 滤波样本幅度的幅度平方得到样本的功率增益,并计算功率增益的幅度平方。 然后更新功率增益窗口和功率增益平方和的总和。 然后对幅度样本的窗口的这些和进行平均以估计样本窗口的第一和第二矩。 平均值被低通滤波以最小化波动。 最后的平均值输入到基于时刻的Greenstein-Michelson-Erceg(GME)方程组,以获得功率增益的时间平均值和功率增益的均方根偏差的估计。 K因子根据这些方程式进行计算,低通滤波以平滑结果。