| 摘要 |
PROBLEM TO BE SOLVED: To provide an improved method of predistorting a transmit signal whereby the distortions occurring in all nonlinear subassemblies are compensated for using a particularly suited feedback signal and to provide a transmitter, a transmitting station, and a communications system using the method. SOLUTION: 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 for measuring the spectral power of the transmit signal at the desired radio frequency both within a first frequency range, which lines within the transmission spectrum, and within a second frequency range which is outside of the transmission spectrum. The digital predistortion disclosed is flexibly parameterized and adapted to the current behavior of the transmitter subassemblies by the feedback control.
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