Patent ID: 7539167
Filing Date: 2009-05-26
Classification: H04B,H04L

Abstract:
1. A spread spectrum receiver for receiving and decoding an input signal r(k) consisting of a sequence of chips, the receiver comprising: a correlator for processing the input signal r(k) and providing at its output a signal y(n) which consists of a sequence of symbols; a phase rotator, coupled to an output of the correlator, for rotating the phase of the signal y(n) based on a filtered phase error signal θ(n) in order to compensate a carrier frequency offset Ω contained in the input signal r(k); a detector, coupled to an output of the phase rotator, for receiving the rotated signal z(n) and for taking a decision on the symbols and providing on an output an output signal c(n) which can subsequently be demapped to a sequence of bits, an error signal generator, coupled to the outputs of the phase rotator and the detector, for generating a phase error signal e(n) which depends on the carrier frequency offset of the input signal r(k), a loop filter, coupled to an output of the error signal generator, for filtering the phase error signal e(n) and feeding the filtered phase error signal θ(n) to the phase rotator, and a phase pre-compensation block which comprises a phase pre-compensation estimator, a pre-compensation signal generator and a pre-compensation phase rotator.