A Concurrent Dual-Band Square Root-Based Model Based on Memory Polynomial for Closely Spaced Signals

In this paper, a novel polynomial model has been proposed to solve the problem of spectral overlap occurs in close dual-band. The proposed model effectively compensates for nonlinear distortion in closely spaced multi-carrier signals. The experimental results show that the proposed model can reduce more than 75% baseband sampling rate compared with the broadband digital predistortion (DPD) model. Moreover, the proposed model can achieve the similar adjacent channel power ratios (ACPRs) as with the broadband DPD model and more than 15dB ACPRs improvement compared with the two dimensional digital predistortion (2D-DPD) model.