Patent ID: 6690747
Filing Date: 2004-02-10
Classification: H04B,H04L

Abstract:
A method for producing a reference signal from a modulated signal, comprising:weighting a set of received antenna signals to form a copy signal corresponding to a remote station, the weighting using a spatial weight vector corresponding to the remote station, the copy signal being in the form of copy signal samples; and determining samples of the reference signal by, for each of a set of sample points: 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; relaxing the phase of the ideal signal sample towards the copy signal sample phase to produce the phase of the reference signal; and producing the reference signal having the phase of the reference signal produced by relaxing the phase of the ideal signal towards the copy signal sample phase.