A wireless telecommunication system receiver is described comprising a demodulator adapted to demodulate a signal received from a source via a transmission channel to provide an error correction code word in the form of flexible or hard values, a decoder adapted to decode the code word, characterized in that it further comprises decision means adapted to receive an estimation of the fading coefficients of the channel during the transmission of the code word as well as an estimation of the noise variance or the signal to noise ratio, to deduce therefrom an estimation of the relative instantaneous mutual information to the channel, and to decide whether or not to inhibit the decoding of the code word by the decoder, according to whether the binary rate of transmission of the source is respectively greater than or less than a characteristic threshold of the instantaneous mutual information.