Research On Interference Suppression Algorithm Based On D2D

With the gradual maturity of a large number of Internet technologies,the technological innovation of communication systems has become more and more remarkable,both in terms of communication capabilities and communication quality.D2 D communication technology(Device-to-Device,terminal pass-through)is a technology that can directly establish communication between short-distance mobile users.Users using this communication method can complete the data transmission process without forwarding signaling through the base station.The application of this technology to the communication system can not only reduce the idle waste of resources,but also increase the utilization rate of the frequency band and meet the user's demand for surfing speed on the Internet.However,while the introduction of this technology brings excellent user enjoyment,it will indeed cause non-negligible interference to cellular users.In order to solve this interference problem,this article will focus on researching and exploring interference suppression algorithms.This article focuses on the resource allocation and power control in the two multiplexing schemes(one-to-one and one-to-many),which does not affect the normal data transmission and communication of users,and aims to suppress intra-system co-channel interference and improve system throughput.Two interference suppression schemes are proposed.The main work content is as follows:(1)First,briefly describe the D2 D communication technology,analyze the interference between users during the D2 D communication process,and outline the interference coordination technology.(2)Secondly,in a single-cell environment with fewer D2 D users than cellular users,a D2 D user and a cellular user perform resource reuse.In order to reduce the co-channel interference in the system,the TPF algorithm is proposed and added in the resource allocation process.The priority of the delay weight is used as the basis for the resource allocation order.The allocation order is from high to low.The higher the priority,the higher the transmission rate,and the fewer resource blocks(RB)required to meet the rate requirements.Can allocate spectrum resources more efficiently.Simulation analysis shows that this scheme can guarantee the data transmission rate requirements of users in D2 D communication when there are many D2 D pairs,and this method can also effectively improve the fairness of scheduling among users.(3)Finally,in a single-cell environment where there are more D2 D users than cellular users,multiple D2 D users and multiple cellular users perform resource reuse,in order to reduce the co-channel interference caused by resource reuse,a graph based on cumulative shading is proposed.Coloring resource allocation algorithm.First,create interference graphs and candidate sets to model the interference relationship between users,then create a list of available colors for D2 D users under the premise of ensuring cellular user service requirements,and finally provide D2 D users according to the network energy efficiency function Perform clustering.In order to improve D2 D fairness and communication system throughput,the game theory method is used to control the transmit power of D2 D users who use the same cellular channel for communication.Simulation analysis shows that this solution ensures that D2 D users can maintain a high access rate in user-intensive scenarios,and the throughput of the entire system is improved.