Amplitude Varying Phased Array Linearization

A new optimization technique for amplitude-varying phased array digital predistortion (DPD) is presented. The new technique improves the linearization compared to the conventional phased array DPD techniques as the amplitude variation increases across the array. The measurement results indicate that linearization can change the adjacent channel power (ACP) pattern leading to increased ACP in the sidelobes. This sheds light on the trade-off between the main beam and side-lobes levels in the ACP pattern under different DPD techniques. We evaluate total radiated ACP or integrated ACP (IACP) and peak of ACP (PACP). We show that slight amplitude variation improves the IACP and PACP. However, as the amplitude variation increases, IACP of phased array with DPD is worsened compared to phased array without DPD.