Patent ID: 7796707

Claim:
A device for converting a complex-valued bandpass signal into a digital baseband signal, the device comprising: an analog filter unit for filtering the complex-valued bandpass signal so that signal components outside of a useful band are suppressed to produce only a real component from the filtered signal, and to provide a real-valued bandpass signal; one analog-to-digital converter connected to the analog fitter unit and that converts the real-valued bandpass signal into a digital signal with sampled values with a width of one bit; a digital filter unit connected to the analog-to-digital converter, the digital filter being a lookup table and providing a complex-valued filtered signal in that the digital signal is filtered by complex-valued FIR filtering so that signal components outside of the useful band are suppressed; a sampling rate reduction unit connected to the digital filter unit for reducing a sampling rate of the complex-valued filtered signal and for providing a reduced-rate signal; and a mixer unit connected to the sampling rate reduction unit for converting the reduced-rate signal into the digital baseband signal.