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Signal transmission between a transmitter and a receiver, in particular a mobile receiver, is strongly affected by the characteristics of the radio channel. So test signals reflecting the real conditions of mobile-radio reception are used in the development and type approval of receivers. Fading simulators are employed for such tasks. Up to now three instruments were required to generate real-life test signals: signal generator, local oscillator and fading simulator. But when Signal Generator SMIQ and its fading-simulator option are used, the required test signals can be produced in a single unit.
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