A PDL Effect Compensation Method for High Order Continuous Polarization Modulation

Abstract

The invention discloses a method for compensating a PDL effect in high-order continuous polarization modulation. The invention first analyzes an influence of the PDL effect on the high-order continuous polarization modulation and then provides a method for eliminating the PDL effect by using pre-compensation. In the method, since the division of a receiving end determining area is closely related to a received polarizing angle of a polarized state, an optimum pre-compensation factor using a maximized polarizing angle as a determining criterion is designed in order to obtain an optimum compensation effect. Finally, a theory and simulated analysis manifest that the method may effectively improve the bit error rate (BER) performance of the high-order continuous polarization modulation influenced by the PDL effect so as to further improve the spectrum efficiency of the high-order continuous polarization modulation.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, is a method for combating PDL effect based on pre-compensation, and in particular relates to a PDL effect compensation method for high-order continuous polarization modulation. Background technique [0002] In a wireless communication system, the complexity of the wireless signal propagation environment itself leads to very complex wireless channel characteristics. However, complex wireless channel characteristics will produce complex and changeable depolarization effects, such as polarization mode dispersion (Polarization Mode Dispersion: PMD) polarization dependent loss (Polarization Dependent Loss: PDL) effect, which will seriously affect The polarization state of the transmitted signal. Under single-carrier conditions, the power attenuation characteristic shown on the channel depolarization characteristic is called polarization-dependent attenuation PDL. The researchers found...

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Problems solved by technology

DongWei et al. (Dong Wei, Chunyan Feng, Caili Guo and Fangfang Liu, "A power amplifier energy efficient polarization modulation scheme based on the optimal pre-compensation," IEEE Communications Letters, 2013:513-516) pointed out that the larger the pre-compensation factor ε , the greater the distance between the constellation points of the polarization state of the signal at the receiving end, the smaller the distortion of the constellation structure, and the compensated polarization state will suffer from more serious power attenuation, which makes it impossible to take both power attenuation and Constellation distortion, the reduction of constellation distortion will definitely bring serious power attenuation

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