Patent ID: 8233563

Claim:
A radiofrequency transmission system comprising: means of producing a complex digital signal S quantised on N bits; means of transforming the complex digital signal S into two complex digital signals S LINC P and S LINC N which have an identical and constant envelope that is phase-shifted with respect to one another, wherein S=S LINC P +S LINC N ; a digital processing pathway associated with each of the two complex digital signals with a constant envelope and comprising at least some filtering means of a sigma-delta type for quantising on M bits signals travelling in the processing pathway, M being less than N; digital-to-analogue conversion means for converting the outputs of digital processing pathways into analogue signals; means of selectively filtering of a bandpass type the analogue signals in a predetermined transmission frequency band; means of amplifying the filtered analogue signals; and means of recombining the amplified analogue signals.