In this paper, we propose an eigenvalue decomposition (EVD) based digital predistortion (DPD) design for nonlinear memory PAs in active antenna array structure with offline and time-variant scenario. The simulation environment incorporates various non-ideal effects based on IEEE Std 802.15.3d, the transmitter error vector magnitude (TX EVM) performance can be improved from -9.07dB to -20.64 dB in the presence of the proposed DPD. Furthermore, since the characteristics of the sub-THz power amplifiers are sensitive to temperature changes, we simulate the impact when the temperature rises from 27 °C to 125°C. This leads to inaccurate offline estimation, while with the proposed online tracking mechanism, the TX EVM can be improved from -13.34 dB to -20.05 dB. For the hardware implementation, we use 16-nm FinFET CMOS process with eight times parallelism architecture to achieve a data transmission with a bandwidth of 7.04GHz. The core area and power are 0.106 mm2 and 464.8 mW for the TX DPD, and 0.0576 mm2 and 252.0 mW for the receiver optimizer, respectively.