A polarization-amplitude-phase modulation scheme for improving the power amplifier energy efficiency
To improve the power amplifier (PA) energy efficiency, a polarizationamplitudephase modulation (PAPM) scheme in wireless communication is proposed. The proposed scheme introduces the signals 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 amplitudephase modulation. Also, since the transmitted signals 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 amplitudephase is formulated, and the distribution of the optimum solutions is presented. The simulation results show that PAPM can improve the PA energy efficiency significantly.
energy efficiency polarizationamplitudephase modulation power amplifier nonlinearity polarization dependent loss