Frequency-dependent magnitude pre-distortion for reducing spurious emissions in communication networks

摘要

Its size - and preferably phase-is applied to the input signal to reduce the spurious radiation resulting from successive signal amplification of the frequency-dependent predistortion. In preferred embodiments, USA corresponding to the predistortion technology is frequency-dependent predistortion amplifier distortion having a piece size and phase of another surface on the ± 90 ° at the carrier frequency that is proportional to the frequency offset from the carrier frequency of the present invention in Patent Application No. 09 / 395,490 ( '490 Application "), a predistortion technique is described in a combination of the amplitude and phase (frequency independent). Because of these characteristics to match those of the differentiator, the whole of this part of the amplifier distortion correction can be made using a differential filter. Embodiments of the present invention can be performed in the baseband domain. Implementation can also be based on a look-up table is adaptively updated to ensure optimum performance over the time. ; Predistorted signal, the input signal, the spurious radiation, the time differential, the baseband signal