Patent ID: 6567462
Filing Date: 2003-05-20
Classification: H04B

Abstract:
In a receiver for recovering data, for at least one of a plurality of users, from spread spectrum radio signals that include radio signals representative of a combination of data and a data spreading code associated with the at least one of the plurality of users and a combination of a predetermined sequence of pilot data and a pilot spreading code, the improvement comprising:a plurality of antennas, each one of said antennas configured to detect a different version of the radio signals; a base band conversion device electrically coupled to said antennas and configured to generate, for each version of the radio signals, a version of baseband signal samples representative of the respective version of the radio signals; and a data recovery device configured to: correlate each version of the baseband signal samples with respect to the pilot spreading code to obtain respective versions of correlated pilot spreading code signal samples; form at least one covariance matrix from a frequency domain representation of a predetermined temporal window of the respective versions of the correlated pilot spreading code signal samples; correlate each version of the baseband signal samples with respect to the data spreading code to obtain respective versions of correlated data spreading code signal samples; form a frequency domain representation of each version of the correlated data spreading code signal samples; and detect the data from the frequency domain representation of each version of the correlated data spreading code signal samples in combination with the at least one covariance matrix.