Digital Predistortion in MIMO-OFDM Systems Using Power-Injection Technique

Digital predistortion is widely used in MIMO systems to solve the nonlinearity, memory effect, and crosstalk effect of power amplifiers. In this letter, we propose a power-injection digital predistorter, which consists of two submodules, and their outputs constitute the low-power injection signal. We have carried out simulation verification and achieved a relatively good linearization effect.