Method for determining a corrected variance representative of the condition of reception of signals representative of symbols

A device for determining a corrected estimated variance representative of a condition of reception of signals representative of symbols transferred by an emitter to a receiver through a communication channel, wherein the device for determining the corrected estimated variance comprises:

• an estimator to produce an estimation of a variance by a Wiener channel estimator comprising a linear filter of which coefficients are determined at least from a given average signal to interference plus noise ratio value, so that an accuracy of the estimation of the variance increases as a number of the coefficients of the linear filter increases;
• and
• a multiplier to multiply the estimation of the variance by a correction factor, the value of the correction factor being dependent at least on the number of coefficients of the linear filter of the Wiener channel estimator, wherein the value of the correction factor is further dependent on the given average signal to interference plus noise ratio value.