A spectrum efficient polarized PSK/QAM scheme in the wireless channel with polarization dependent loss effect

A Polarized Phase Shifting Keying/Quadrature Amplitude Modulation(PPSK/PQAM) scheme in the wireless depolarized channel is proposed. Such scheme uses the carrier´s polarization state, amplitude and phase as the information bearing parameters, and can further improve the traditional modulation methods´ spectrum efficiency. The impairment to PPSK/PQAM from the wireless depolarized channel is quantitatively analyzed. To mitigate such impairment, a constellation compensation algorithm is also presented. Furthermore, the PPSK/PQAM´s symbol error rate is derived on the basis of the proposed constellation compensation; then to maximize the PPSK/PQAM´s link spectrum efficiency (LSE), the optimal modulation ratio, which is defined as the ratio of the data rata achieved by the polarization state and amplitude-phase, is also calculated. Finally, simulations show that PPSK/PQAM´s SER and LSE performance have significant advantage over the traditional PSK/QAM modulation methods.