Patent ID: 6724246
Filing Date: 2004-04-20
Classification: H03D

Abstract:
Demodulation structure for downconverting and demodulating a digitally modulated signal, comprising:a local oscillator means for providing a local oscillator signal, a mixer means for mixing said local oscillator signal and said digitally modulated signal in order to obtain a mixed signal, a low pass filter means for low pass filtering said mixed signal from said mixer means, and an analog-to-digital converting means for converting the filtered signal from said low pass filter means info a downconverted and demodulated digital signal, whereby said local oscillator signal is set in respect to said digitally modulated digital signal so that said downconverted and demodulated digital signal output from said analog-to-digital converting means comprises two serially arranged information parts, and wherein said digitally modulated signal is modulated in a signal band having a center frequency and said local oscillator signal has a center frequency, which is, in respect to said center frequency of the signal band, offset by half of the signal band width of the digitally modulated signal.