Patent ID: 6516023
Filing Date: 2003-02-04
Classification: H04B

Abstract:
A system for simultaneous transmission and reception where a received signal is downconverted, by using a transmitted signal (35), employed as a local oscillator (LO), characterized in that a digital signal processor (DSP) is provided which compensates for unwanted modulation in the transmitted signal (35) used for downconversion, that a digital complex baseband reference signal (46a) is used for elimination of the unwanted modulation in the transmitted signal where a part (35) of the transmitted signal is employed as the local oscillator (LO),said elimination being performed digitally with the aid of a digital signal processing algorithm in complex baseband, and that there is provided a multiplier (80) for said elimination, there being carried out an inverse operation of the multiplication in the multiplier (25) which relates to every kind of phase and/or frequency modulation in the local oscillator (LO) to which the received signal (24) is applied.