Behavioral Modeling of Concurrent Dual-Band Transmitters Based on Radially-Pruned Volterra Model

This paper presents a radially-pruned multi-dimensional Volterra model for the modeling and linearization of concurrent dual-band transmitters. The proposed model accounts for the impact of cross-band intermodulation distortions of the dual-band power amplifier (PA) and also the effect of quadrature modulator (QM) imperfections. The performance of the proposed model is validated using a broadband class AB PA driven concurrently by two independent LTE signals at a separation frequency of around 60 MHz, in the presence of in-phase/quadrature (I/Q) modulator imperfections. The measurement results validate the accurate linearization performance of the proposed model in suppressing the adjacent channel power (ACP) , as well as the QM impairments, as compared to other state-of-the-art models.