A polarization-amplitude-phase modulation scheme for improving the power amplifier energy efficiency

摘要

To improve the power amplifier (PA) energy efficiency, a polarization-amplitude-phase modulation (PAPM) scheme in wireless communication is proposed. The proposed scheme introduces the signal's polarization state (PS), amplitude, and phase as the information-bearing parameters. Thus, the data rate can be further enhanced on the basis of the traditional amplitude-phase modulation. Also, since the transmitted signal's PS completely manipulated by orthogonally dual-polarized antennas is unaffected by PA, PAPM can let PA work in its nonlinear region to acquire high PA efficiency. To further optimize the PA energy efficiency based on PAPM, a constrained optimization problem regarding the output back-off value and the ratio between the data carried by the PS and the amplitude-phase is formulated, and the distribution of the optimum solutions is presented. The simulation results show that PAPM can improve the PA energy efficiency significantly.