Research On Interference Management Of D2D Communication System Based On Intelligent Reflective Surface

In recent years,with the popularization of mobile devices and intelligent terminals,the demand for data services in wireless networks has increased dramatically.Device to device(D2D)communication is considered a promising technology to meet this rapid growth in data traffic and achieve seamless communication.The energy efficiency of the whole network can be improved by using the proximity of D2 D communication users,and the study of the maximum total speed of D2 D communication system is of great technical reference for the evolution of wireless mobile communication system in the future.However,jamming management is one of the most important challenges facing D2 D communication,and existing jamming management schemes are designed on the assumption that the radio transmission environment of jamming channels is fixed.Therefore,the degree of interference suppression is fundamentally limited.Reflecting Intelligent Suface(RIS)isis an emerging green and economical technology that enhances wireless networks by intelligently controlling phase shifts to reconfigure the wireless propagation environment.The signals reflected by the intelligent reflector can constructively alter the phase and amplitude of the receiving signal to enhance the desired reception and inhibit environmental interference.Under the scenario of cellular and D2 D communication users living side by side with intelligent reflector,the total speed of cellular and D2 D communication systems is maximized by using the phase shift controllability of intelligent reflector and the different index requirements of cellular and D2 D communication links,and the environmental interference problem of the D2 D communication system is managed.An optimal phase shift optimization scheme based on taboo search algorithm is proposed for the environment disturbance of D2 D communication system assisted by intelligent reflector.Under the condition that the user's emitting power remains the same,the global optimal solution of the phase shift of the intelligent reflector is obtained by quantizing Bit B and combining with the taboo search algorithm.A power allocation scheme based on continuous convex approximation is proposed to solve the problem of interuser interference in D2 D communication system assisted by intelligent reflector.Combined with the system model,the mathematical expression of the total rate of the system is obtained.The target function of the power optimization problem is the function of cellular user transmission power and D2 D communication user transmission power as independent variables.By using the properties of logarithmic function,the expression of the system's total speed can be mathematically decomposed into a target function in the form of difference between two convex functions.By distributing the user's transmission power,the interference management of the user-to-user interference problem of the D2 D communication system is carried out.