A High Efficiency Power Amplifier Method Using Signal Decomposition in OFDM Communication System

OFDM is a powerful competitive technology in the 5G era and is one of the core technologies in 4G communication system, due to its robust to multipath-fading and high frequency efficiency. However, the high peak-to-average-power-rate (PAPR) problem of OFDM has not been fully solved, which should be considered specifically in 5G communication system, and it is harmful to the power efficiency of power amplifier. For the purpose of alleviating high PAPR problem, in this paper, a signal decomposition scheme is introduced into the high PAPR OFDM system. With the method, the original signal is decomposed into multi-branched signals which will be amplified by multi power amplifiers, and then the amplified signals are combined for transmission. After decomposition, all of the branched signals have lower PAPR, which significantly increase the power efficiency of branched power amplifier. Both of the theoretical analysis and simulation results indicate that the performance of PAPR and power efficiency can be improved.