Patent ID: 6198764
Filing Date: 2001-03-06
Classification: H04B

Abstract:
A method for the transfer of a digital data signal from a transmitter to a receiver using a spread spectrum technique, comprising the steps of:modulo-2 adding the digital data signal with a pseudo noise (PN) code sequence of the transmitter to generate a spread data signal;modulating a carrier with the spread data signal;transmitting the modulated carrier;demodulating the modulated carrier in the receiver; andmultiplying the demodulated signal with a PN code sequence produced in the receiver which coincides and is synchronized with the PN code sequence of the transmitter, to obtain the digital data signal, and in the transmitter the carrier is modulated using a first or second modulation type with the spread data signal, and in addition, the respective other of these two modulation types is modulated with a synchronizing signal representing the synchronizing information of the PN code sequence of the transmitter.