TRANSMITTER AND METHOD FOR GENERATING TRANSMISSION SIGNAL

PROBLEM TO BE SOLVED: To improve a conventional transmitter for generating a transmission signal and its method by reducing expenses needed to filter the transmission signal on a subsequent stage. SOLUTION: A 1st modulator 12 generates an uncompensated transmission signal Y (t) by modulating at leas...

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Hauptverfasser:	BIRTH WINFRIED, FROEHLICH ANDREAS
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRONIC CIRCUITRY ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY MODULATION TRANSMISSION TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To improve a conventional transmitter for generating a transmission signal and its method by reducing expenses needed to filter the transmission signal on a subsequent stage. SOLUTION: A 1st modulator 12 generates an uncompensated transmission signal Y (t) by modulating at least one baseband signal I or Q obtained by using respective oscillation signals LOQ and LOI. A compensation signal C (t) almost representing a component to be compensated for in the uncompensated transmission signal Y (t) is formed at the output terminal of a 2nd modulator 14. The compensation signal is generated by the 2nd modulator by modulating the baseband signals I and Q with an appropriate auxiliary oscillation signal. The compensation signal Y (t) is subtracted from the uncompensated transmission signal Y (t) in order to generate at least partially compensated transmission signal Y' (t).