Single feedback loop-based digital predistortion for linearizing concurrent multi-band transmitters

In this paper, a single feedback loop-based digital predistortion (DPD) architecture with a related DPD method is proposed to linearize concurrent multi-band transmitters. In this new structure, a low-complexity DPD method has been developed to successfully extract nonlinear characteristics of power amplifiers by utilizing the captured output signals separated in both time and frequency domain. Experimental results showed that the proposed DPD architecture can significantly reduce the system cost in both feedback loop and model complexity.