Abstract
A generalised two-box cascaded Hammerstein-like (GTBC-H) digital predistorter is proposed for linearising wide-band RF power amplifiers (PAs). The GTBC-H predistorter is composed of a static nonlinearity block for countervailing the strong static nonlinearities and a dynamic nonlinearity block for compensating the memory effects of RF PAs. The proposed predistorter adds extended cross-terms of the leading terms and some lagging envelope terms in the dynamic nonlinearity block to compensate the memory effects of wide-band RF PAs more effectively. A 460 MHz and a 1.94 GHz Doherty RF PA are utilised to validate the performance of the proposed predistorter when a three-carrier wide-band CDMA and a single-carrier long-term evaluation signal are applied separately. The validation results illustrate that the proposed GTBC-H predistorter can further suppress the residual out-of-band emission over the augmented Hammerstein, the enhanced Hammerstein and the parallel-LUT-MP-EMP predistorter.
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