Patent ID: 7042966
Filing Date: 2006-05-09
Classification: H04B,H04W

Abstract:
1. A method of estimating a signal-to-noise ratio of a digital signal received by a radiocommunications receiver, the method comprising: estimating separately a wanted signal and a noise signal of the digital signal; filtering separately the wanted signal and the noise signal; and determining the signal-to-noise ratio by dividing the wanted signal which has been filtered by the noise signal which has been filtered, wherein the filtering of the noise signal comprises determining a noise value which is used to determine the signal-to-noise ratio based on a statistical distribution of noise power measurement samples for a predetermined period during which a statistically representative number of the noise power measurement samples is collected and wherein the predetermined period is sufficiently short for the noise signal to remain practically stationary, wherein a first order auto-regressive infinite impulse response filter is used to filter the wanted signal as expressed by the equation: where {tilde over (x)}