Method, arrangement and communication receiver for SNIR estimation

摘要

A method, arrangement ( 512 ) and communication receiver ( 500 ) for SNIR estimation of a received signal, by: deriving ( 512 A) an estimation Z of SNIR of the received signal in accordance with the relation $\hat{Z}=\frac{{\left[E\left\{r\left(t\right)\right\}\right]}^2}{E\left\{r^2\left(t\right)\right\}-{\left[E\left\{r\left(t\right)\right\}\right]}^2},$ where E represents mean value and r(t) represents the level of the received signal; and correcting ( 512 B, 512 C) the estimation Z to produce a corrected estimation Z based on the relation Z=alpha(Z)xZ, where alpha(Z) represents a correction factor. The estimation may be corrected by calculating the correction factor, retrieving the correction factor from a predetermined table ( 512 B) or retrieving the corrected estimation from a predetermined table. The correction may be effected by adding to a logarithmic estimation a logarithmic correction factor. This provides the advantage of improved performance under conditions of low signal to noise ratio.