Complexity Analysis of Wideband Power Amplifiers Linearization in Multi-Band Signal Transmission for Massive MIMO Systems
Massive multi-input and multi-output (MIMO) systems request wideband power amplifiers (PA) for multi-band signal transmission. In this paper, we present different digital predistortion (DPD) techniques to linearize wideband PA with multi-band stimulus. We firstly propose a general form for pruned multi-band DPD models with low complexity. A study on the implementation complexities of different linearization methods is then analyzed. This paper provides a critical view on the metric of implementation complexity in function of the DPD model complexity and the sampling frequency of the signal processing. We finally propose a sampling frequency threshold to determine the best DPD solution according to the measurement results.