Method of and apparatus for predistorting a transmit signal

Details Method of and apparatus for predistorting a transmit signal Method of and apparatus for predistorting a transmit signal

2005-10-11

2005-10-11

Nguyen, Duc M. (Department: 2685)

Telecommunications

Transmitter

With feedback of modulated output signal

C455S114300, C455S114100, C455S115100, C455S108000, C455S295000, C455S303000, C455S127200

Reexamination Certificate

active

06954621

ABSTRACT:
An improved method of predistorting a transmit signal is disclosed whereby the distortions occurring in all nonlinear subassemblies are compensated for using a particularly suited feedback signal. Also disclosed are a transmitter, a transmitting station, and a communications system using the method. The transmit signal, before being converted to the desired radio frequency, is digitally predistorted at baseband by digital signal processing means which are controlled by the feedback signal. This signal is generated by a detector measuring the spectral power of the transmit signal at the desired radio frequency both within a first frequency range, which lies within the transmission spectrum, and within a second frequency range, which lies outside the transmission spectrum. The digital predistortion disclosed is flexibly parameterized and is adapted by the feedback control to the current behavior of the transmitter subassemblies.

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patent: WO 00/72438 (2000-11-01), None

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