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To improve the Power Amplifier (PA) energy efficiency, a Polarization-Amplitude-Phase Modulation (PAPM) scheme in wireless communication, which introduces the signal's Polarization State (PS), amplitude and phase as the information-bearing parameter, is proposed. Since that the transmitted signal's PS can be completely determined by a pair of orthogonal dual-polarized antennas and is unaffected by the PA, using the PS as the information-carrying parameter can further increase the data rate and allow PA to work in its non-linear region. Thus, the PA energy efficiency can be enhanced. On the basis of the above, to optimize the PA energy efficiency, an optimization problem regarding the output back off value and the ratio between the data carried by the PS and the amplitude-phase has been formulated, and the distribution of the optimum solutions is presented. The simulation results show that, with the same symbol error rate and channel state, PAPM can reduce the energy consumption per bit by 50% compared with QAM on average.