Digital Pre-distortion for improving efficiency, linearity and average output power of microwave Point-to-Point power amplifiers used in cellular backhaul telecommunication systems

Digital Pre-distortion (DPD) has been demonstrated to significantly improve linearity while increasing efficiency and average output power in microwave Point-to-Point power amplifiers, such as those used in microwave backhaul for cellular communication systems. By applying Digital Pre-distortion to a three-stage 15 GHz amplifier, linearity was improved more than 20 dB, efficiency at back off was improved from 2.5% to 8.9%, and average output power increased from 22.5 dBm to 26.3 dBm.