Performance Evaluations of Microwave Power Amplifiers for Complex Digital Communication Systems

This paper presents the performance evaluations of microwave power amplifiers (PAs) for complex digital communications based on the time-domain signal processing and the hybrid Volterra series. Modulation schemes included pi/4-DQPSK, 16-QAM, and OFDM formats are examined to show the influences due to the different peak-to-average-power-ratio (PAPR) features on the performances for the output power, adjacent-channel-power-ratio (ACPR), and error-vector-magnitudes (EVM). A figure-of-merit of PAs based on linearity and efficiency is presented to establish a criterion for choosing the best working condition