Digital predistortion (DPD) based on Volterra models is commonly employed to counteract nonlinear distortion of power amplifiers. However, when concurrent dual-band signals are transmitted, two-dimensional DPD models are required. In this work an upgrading of a standard dual-band model is proposed and justified using multinomial theorem. The linearization performance of the current proposal has been compared to the unextended model. 5G New Radio signals have been generated to compose a dual-band signal, which later was employed as input signal at Chalmers University of Technology's RF WebLab. Using coefficient selection techniques, the most relevant regressors are shown and the importance of the new extension is proven. Linearization results highlight the benefits of this proposal.

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