Rohde and Schwarz Gmbh & Co. Kg

Andreas Hecht

Wolfgang Kufer

Wolfgang Kernchen

A signal generator comprises at least one first base band unit and a second base band unit, generating a digital base band signal. At least one first frequency offset unit, connected to the first base band unit, which adds the output signal form the second base band unit and the output signal from the frequency offset unit and an I/Q modulator, in series with the addition unit are provided.

Signal generator with frequency offset unit in the base band

A system and method for generating an I/Q signal for an I/Q modulator (). The signal is composed of two or more data streams, which have been edited according to identical or different modulation methods. A known modulation encoder is used to generate corresponding digital I/Q values from a first inputted digital data stream. The I/Q values then undergo a digital-analogue conversion () that generates the corresponding analogue I/Q signals. The system includes an additional modulation generator that calculates digital I/Q values, or generates I/Q values from an additional inputted digital data stream. The digital I/Q values of the modulation encoder and the digital I/Q values of the modulation generator () are then added together, using digital adders (A) located upstream of the digital-analogue converter ().

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Eichenau, Germany

Andreas Hecht