1. A receiver to receive a communication signal sent through a communication channel, the receiver comprising: a Soft Input Soft Output receiver that, in use, is operable to receive the communication signal and a priori information for the communication signal and to use the a priori information to estimate an interference in the communication signal, the estimation based on candidate vectors having K samples iteratively drawn using Gibbs sampling, wherein the Soft Input Soft Output receiver is configured to change the value of the drawn kth, sample, if a drawn kth sample of a candidate vector has not changed value for a predetermined number of candidate vectors, if a drawn kth sample has a low variance, if a kth sample has a lower variance than all the other samples 1 ... (k−1) and (k+1) ... K.