1. In a communications station, the communications station including an array of antennas and spatial processing means, the spatial processing means including means for weighting a set of antenna signals by a set of corresponding receive weights, each distinct antenna signal derived from the signal received at a corresponding antenna of the array, a method for producing a reference signal from a modulated signal transmitted to the communications station by a particular remote station, the modulated signal modulated at symbol points by a modulation scheme that has a finite symbol alphabet, the alphabet including symbols that have different phases, the method comprising: (a) weighting the received antenna signals to form a copy signal corresponding to the particular remote station, the weighting using a spatial weight vector corresponding to the particular remote station, the copy signal being in the form of copy signal samples; and (b) determining samples of the reference signal by, for each of a set of sample points: (i) constructing an ideal signal sample from the copy signal at the same sample point, the ideal signal sample having a phase determined from the copy signal at the sample point, with the phase of the ideal signal sample at an initial symbol point set to be an initial ideal signal phase; (ii) relaxing the phase of the ideal signal sample towards the copy signal sample phase to produce the phase of the reference signal; and (iii) producing the reference signal having the phase of the reference signal determined in relaxing step (b)(ii), wherein the spatial weight vector is determined from the received antenna signals and from the reference signal.