A cross-polarization discrimination compensation algorithm based on polarization modulation for the power amplifier energy efficiency improvement

In the dual-polarized channel, the power amplifier (PA) energy efficiency is decreased by cross-polarization discrimination (XPD) effect which introduces cross power leakage and then reduces the BER performance of polarization modulation (PM). Therefore, an XPD compensation algorithm based on PM for the PA energy efficiency improvement is proposed. Firstly, the effect of energy efficiency caused by XPD is derived. Then the compensation factor is employed to compensate for the state of polarization (SOP) of the received signals based on channel state information (CSI) estimation. Moreover, the effect of the energy efficiency caused by the channel estimation error is analyzed. Finally, theoretical analyses and simulation results show that the XPD compensation algorithm can improve the PA energy efficiency effectively.