In a base station, the power amplifier (PA) experiences rapid
fluctuations in behavior because of the varying power levels and bandwidth of
its excitation signals. High peak-to-average power ratios and non-constant
envelopes of wideband signals impose stringent linear and efficiency
requirements on the PA required for amplification.
It is necessary to design fast and non-complex digital
pre-distorters that are able to achieve and maintain acceptable linearization
performance and compensate for the dynamic distortions generated by the PA.
This thesis explores an adaptive DPD scheme using multiple model control that
combines a switching and a simple adaptation algorithm.
Experimental data are used in evaluating the proposed scheme. The
multiple model scheme reduces the transient error response and requires a
relatively small number of data samples for identification, switching and
adaptation. The scheme is demonstrated to be fast, less complex, and capable of
maintaining and achieving the linearity requirement of the PA.