Receiver for use in wireless communications and method and terminal using it

A wireless receiver for receiving and demodulating a frequency modulated RF signal by direct conversion includes, a circuit 107,109,113 producing in-phase and quadrature components of the received signal, and an estimator 204 periodically estimating an imbalance in amplitude between the in-phase and quadrature components and applying a relative adjustment in amplitude to compensate for the detected imbalance 205. The estimator 204 (i) divides samples Ii of the in-phase component I(t) and corresponding samples Qi of the quadrature component Q(t) into blocks; (ii) calculates for each block a block power value In corresponding to a summation of values of squares of the samples Ii and a block power value Qn corresponding to a summation of values of squares of the samples Qi; (iii) calculates from the block power values In and Qn a block amplitude imbalance value and (iv) calculates for a set of the block amplitude imbalance values an average value.