Two‐dimensional crest factor reduction for performance improvement of concurrent dual‐band power amplifiers

A two‐dimensional crest factor reduction (2D‐CFR) is proposed to improve the performance of concurrent dual‐band power amplifiers (PAs). Experimental measurements are performed on a 1.9–2.6 GHz concurrent dual‐band LTE PA by using the proposed 2D‐CFR and conventional 1D‐CFR, respectively. Measured results after 2D digital predistortion (2D‐DPD) show that the output power with the proposed 2D‐CFR is increased by 10%, the efficiency is improved from 28.1 to 30.6% and the error vector magnitude is reduced from 3.46 to 2.67%, indicating a significant performance improvement.