Effects of HPA Phase Distortion on System Performance

There have been few papers discussing about the phase distortion of High Power Amplifier (HPA) in detail, and many literatures concerning about the HPA have considered the AM/PM distortion of Solid State Power Amplifier (SSPA) as zero. The influence of AM/PM distortion of HPA was deeply analyzed by evaluating BER, Total Degradation (TD) and Power Spectral Density (PSD) performances in wireless OFDM systems. Traveling Wave Tube Amplifier (TWTA) and Solid State Power Amplifier (SSPA) based HPA models are adopted for the computer simulations and analysis. Some useful and important conclusions are drawn to deal with phase distortion in the process of HPA predistortion.