Patent ID: 6330273
Filing Date: 2001-12-11
Classification: H04B

Abstract:
Apparatus for code tracking in a direct sequence spread spectrum receiver, comprising means for receiving a signal, means for converting the received sign into an inphase and quadrature signal, and analogue to digital converter means for converting the inphase and quadrature signals into digital signals;characterized in that said apparatus further comprises a first correlator for handling prompt signals, a second correlator for handling late signals, a third correlator for handling early signals, estimation means for obtaining estimates of the output signals from the first correlator, first and second multiplying and adding means for multiplying the estimates with the output signals from the second and third correlators respectively and adding the inphase and quadrature channels together, subtraction means for subtracting the result from said first and second adding means, and control means arranged to receive the output signals from said subtracting means and generate control signals for the analogue to digital converter means.