Pulse or digital communications – Transmitters – Antinoise or distortion
Reexamination Certificate
2008-05-13
2008-05-13
Fan, Chieh M. (Department: 2611)
Pulse or digital communications
Transmitters
Antinoise or distortion
C375S308000, C375S315000, C330S127000
Reexamination Certificate
active
07372918
ABSTRACT:
The invention provides a transmission device having adaptive digital predistortion, which has a transmission path and a feedback path. The transmission path contains a predistortion unit which takes a derived control signal (LS) and baseband signals applied to the input side as a basis for calculating the address of a predistortion coefficient (KOEFF1) stored in a memory and logically combines this predistortion coefficient with the applied baseband signals in a complex multiplication unit. The use of complex coefficients and of the complex multipliers allows compensation both for AM/AM distortion and for AM/PM distortion in an amplifier device connected downstream of the predistortion unit. Usefully, the feedback path of the transmission device with digital adaptive predistortion can also be implemented using the reception device in a transceiver.
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Ceylan Nazim
Müller Jan-Erik
Ejaz Naheed
Eschweiler & Associates LLC
Fan Chieh M.
Infineon - Technologies AG
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