Patent ID: 6625201
Filing Date: 2003-09-23
Classification: H04B

Abstract:
Coherent receiver, comprisinga correlator (13) for correlating a received bitstream, a channel estimator (15) for estimating tap coefficients on the basis of an output signal of the correlator (13), wherein the channel estimator (15) comprises interference cancellation means (31, 32, 33) for eliminating interference components in the output signal of the correlator (13), a detector (14) for detecting information symbols on the basis of the output signal of the correlator (13) and the estimation tap coefficients, characterized in that the interference cancellation means comprise respectively for each estimation tap coefficient: means (31, 32) for calculating interference components, comprising: scaling means (31) for scaling the estimated tap coefficients on the basis of the number L of chips constituting one symbol of the received bitstream, and cross correlation calculation means (32) for multiplying the scaled estimated tap coefficients by a cross correlation term based on a spreading sequence and a path delay; and means (33) for subtracting interference components from an estimated tap coefficient to generate an improved estimated tap coefficient to be supplied to the detector (14).