running in embodiments of the present invention all that is required is that the agc process has run before the reliable sop estimate is determined stage 4 of the method comprises determination of a coarse carrier frequency offset cfo estimate by the coarse cfo module 512 steps g and h in this example this stage of the method uses a fourth series of n_rcfo cross correlator output sample subsequent to the third series once again it will be readily appreciated that the cfo estimate can be determined at anytime during the sts processing and that the only requirement is for the coarse cfo estimate to be determined by the time the reliable sop estimate has been determined following determination of a coarse carrier frequency offset estimate the sts processing method is at an end and the training process moves to lts processing step i using the lts module 514 the lts processing will not be described in detail here for the sake of clarity in this method it is possible to revise sample timing more than once throughout the sts processing time line without compromising overall performance at any stage in the method if the processing results are inadequate or inconsistent processing can revert to stage 1 the detection of the presence of a data packet and the determination of a first sop estimate for example if after the agc loop has settled successive correlator outputs do not show the presence of the characteristic cir peaks then the.