Adaptive Polarization Modulation in Depolarization Channel with Polarization Dependent Loss

Abstract

To adapt to variation of polarization dependent loss (PDL) in depolarization channel, an adaptive polarization modulation scheme which can improve the spectral efficiency of polarization modulation system is proposed. In the proposed scheme, the transmitter adapts the optimal constellation size to the variation of the channel due to PDL while fulfilling a fixed target BER constraint, which is based on the received feedback information of channel state information estimated at the receiver. Our simulation results and analysis show that, adaptive polarization modulation (APM) can achieve higher spectral efficiency (SE) than nonadaptive polarization modulation, subject to the same fixed target BER constraint.

Phase Noise Cancelation Based on Polarization Modulation for Massive MIMO-OFDM Systems

“…We have proposed the differential polarization shift keying, which is a special PM, to cancel phase noise for the OFDM system in our prior work [34]. In a realistic wireless channel, the polarized signals are distorted by depolarization, such as cross-polarization discrimination (XPD) [35,36], polarization-dependent loss (PDL), and polarization mode dispersion (PMD) [37]; some papers propose the channel compensation methods to improve the PM performance [29][30][31][32][38][39][40]. In this paper, we extend the phase noise cancelation scheme for a larger number of antenna scenarios under XPD effect.…”