Research On Full Duplex Self Interference Cancellation Based On Polarization Modulation

At the rapid development of the fourth generation of mobile communications,the communication rate of the communication system has gradually reached the bottleneck of its continued growth.The spectrum utilization rate is also limited by the existing communication modes.Full duplex communication came into being,because it can make full use of time and frequency domain resources,and has become an important communication mode of the fifth generation of communications,thereby increasing the spectrum utilization.To achieve full-duplex communication must first be self-interference elimination,this article is about self-interference cancellation technology research.The task of this paper is from the National Natural Science Foundation:"Research on polarimetric self-interference cancellation in full-duplex system based on additive Gaussianized phase noise(61501050)".Combined the research status at home and abroad,the existing research content of full-duplex basically covers all aspects of communication.The physical layer mainly performs the research of self-interference cancellation technology,and the MAC layer is mainly designed to exert its full potential.The advantages of the duplex,the network layer focuses on the optimization of the throughput of the system.The self-interference cancellation technology studied in this paper is the first step to achieve full-duplex communication and is the technical basis for the content of the other two aspects.Therefore,it can be said that self-interference cancellation technology is the fundamental guarantee for full-duplex communication.The main work of this paper is shown in the following three aspects:The research status of full-duplex communication is summarized and analyzed.The polarization information processing technology is also introduced,which lays a theoretical foundation for the subsequent use of polarization information processing technology to solve the self-interference elimination problem.For the time-frequency domain self-interference cancellation by the power amplifier nonlinearity problem,this paper presents a polarization-based polarization domain baseband self-interference cancellation scheme.Considering that the polarization modulation is not affected by the non-linearity of the power amplifier,a self-interference cancellation scheme based on polarization modulation is proposed under ideal channel conditions.Through the simulation analysis,the effectiveness of the scheme is proved.Compared with the traditional scheme,the scheme proposed in this paper can get better bit error rate performance.Aiming at the problem that the polarization modulation is affected by the depolarization effect under actual depolarization channel conditions,which leads to the decrease of self-interference cancellation performance,a compensation method is proposed to counteract the influence of channel depolarization effect,Thus ensuring self-interference cancellation performance is not affected.This thesis analyzes the performance of the proposed scheme and verifies that the proposed scheme can resist the depolarization effect of the channel.The BER of the system is improved.