A new digital predistortion (DPD) technique for multi-band signals is proposed. The transmitter considered in this paper has multi-band signals, and those signals are combined and amplified by a single wideband power ...
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A new digital predistortion (DPD) technique for multi-band signals is proposed. The transmitter considered in this paper has multi-band signals, and those signals are combined and amplified by a single wideband power amplifier (PA). In this case, the PA output is distorted by the nonlinear crossproducts between different-band signals as well as their own nonlinear self-products. To linearize the PA and remove those nonlinear products, we propose a PD structure, which has multiple predistorters (one predistorter (PD) for one band). Each PD removes the nonlinear cross-products and self-products to mitigate the spectral regrowth for the corresponding band. Since the PD parameters for different bands are linked together, it is difficult to find the PD parameters separately. As an alternative method, we propose an iterative method for finding the PD parameters. The simulation results show that the iterative method converges well, and the proposed PD can effectively linearize the PA and remove spectral regrowth at each signal band.
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