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

Abstract

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.