Anti-interference Study Of D2D Communications

Statistics show that mobile communications occur primarily between adjacent users, D2D(Device-to-Device) communication technology is a potential development of new short-distance direct communication technology,it can improve the capacity of the cell, the spectrum resource utilization and reduce BS’s download. In this paper,the basic concept of D2 D communication communication, D2 D communication initialization,communication mode and other aspects are briefly described. Therefore, after the bringing in the D2 D communication technology, concentred on the interference problem,the paper from three different perspectives, designed the corresponding anti-interference scenarios:1. D2 D anti-interference technology under the fractional frequency reusing scene. On the use of fractional frequency reuse(FFR) cellular communications scene, Firstly,we analyze the D2 D user characteristics in inner region and outer region of cellular network. Then based on the outage probability, accessible regional and reusable regional,we design a reused cellular spectrum scheduling scheme.The performance analysis show that the scheme can effectively suppress the mutual interference between cellular users and D2 D users and effectively improve system throughput.2. D2 D anti-interference scheme based on exclusion regions In order to protect the communication users of cellular mode and D2 D mode, cellular users in the exclusion regions and D2 D users out of the exclusion regions share the same spectrum resources.Studied the influence of users’ coverage, regional spectral efficiency and radius of the exclusion regions on the system performance.Designed an interference control strategy based on exclusion regions(ERs).This scheme can improve the interference between D2 D cellular users and between users3. An algorithm of distributed D2 D based on coalition Game.Cellular users and D2 D users regarded spectrum resources reusing as a transferable utility, gained maximum transmission rate of resource blocks by the formation of multiple user groups Game. In order to improve the convergence speed of the network resource allocation, improved a distributed allocation coalition formed a scheme.The algorithm considering the impact of interference on the basis of D2 D communication,achieved an efficient allocation of resources.