Space-Time-Polarization Cooperation Enabled NOMA Systems:Moedl And Transmission Design

With the development of the information age and the urgent need for high-quality,high-experience communication,the research of a new generation of mobile transmission systems and technologies is particularly important.In the future diversified business application scenarios,such as immersive experiences,smart cities and vehicular ad hoc networks,traditional communication systems and related technologies,are difficult to meet the needs of these new types of services.In order to further accelerate industrial revolution,improve communication performance,accelerating the research of next-generation mobile communication technology has become an international consensus.In order to further cope with future communication scenarios,the traditional Orthogonal Multiple Access(OMA)technology is difficult to meet the high requirements of the next generation mobile communication scenario.The research of Non-Orthogonal multiple access(NOMA)has been received extensive attention.However,in existing research work,the use of NOMA technology is often based on single-polarized antenna systems.Considering the increasing scarcity of resources such as space,time and frequency,and the need for users to have a portable experience,it is imperative to seek new resources to optimize the performance of communication systems.Under the premise of not increasing the physical space of base stations and user terminals,this paper focuses on a space-time-polarization multi-domain coordinated NOMA downlink transmission model,based on which,the corresponding joint allocation of polarization and power is carried out.In this paper,the multipath effect and depolarization effect of polarized signals in space are considered.The spatial-polarization fading channel model is studied and established.Based on this,the corresponding precoding scheme and the design of receiv e combining vectors are designed.Theoretical and simulation results show that the design can effectively eliminate inter-cluster interference signals,thereby improving the signal-to-interference ratio of the user's received signal.After the transmission model is established,in order to further improve the system capacity,the joint allocation of polarization and power resources is carried out.The simulation proves that the dual-polarization system has certain performance gain compared with the traditional single-polarization system.Considering that in the future mobile communication system,the need of user fairness has an important impact on the resource allocation scheme.Based on the above system transmission model,another polarization-power resource allocation scheme based on user fairness is proposed.It can ensure that the spectrum efficiency can be improved while taking into account user fairness.In summary,the spatial-temporal-polarized multi-domain coordinated NOMA transmission system proposed in this paper can improve performance in many aspects,and the corresponding resource allocation scheme can provide a certain theoretical basis for multi-domain resource allocation scenarios in next-generation communication,which has a certain effect on the development of future mobile communication technologies.