Research On Power Control And Interference Suppression Technology For Direct Communication In Terminal Of Cellular Networks

Applying power control in cellular networks can effectively suppress interference and promote the development of green communication,which is an important means of controlling interference in cellular communication.This dissertation conducts corresponding research and analysis on the power control method,of terminal device-to-device(D2D)communication technology in cellular networks.The main contents of the research can be summarized as follows.First of all,we made a statement on the characteristics and origin of cellular network communication technology.We introduced its development course,the current latest technology and the facing challenge.Taking advantage of the opportunities brought by the development of D2D communication,we addressed the bottleneck problems in cellular networks.Secondly,we conducted a detail analysis of the interference caused by the technical problems of D2D communication.It concluded that the interference is small and not obvious when the wireless resources are shared by way of an orthogonal manner in D2D communication.The shared wireless resources by the multiplexing method will lead to a larger interference relatively.The interference caused by the multiplexing method is mainly two categories,and the two categories can be divided into four types,in which uplink and downlink are multiplexed in a cell or between adjacent cells.Then,we introduced the benefits of power control and classification features.Then we focused on analyzing several different power control methods.We concluded that the centralized power control method has large amount of calculation,difficulties in implementing and complicated algorithms.The joint control of power and rate is too much dependence on base stations,which seriously increases the load on the base stations.However,the centralized power control method has the disadvantage of corresponding performance loss.Finally,we added biasing schemes to improve system performance based on two traditional distributed power control schemes and improved OPC(Opportunistic Distributed Power Control)schemes.After simulation analysis,it was verified that the biasing scheme would not damage system performance.And it effectively reduced the user's transmit power and suppress cross-layer interference.Then we introduced the admission control scheme to deal with the unfeasibility of the system when the capacity was increasing.After further simulation analysis,we proved the feasibility of admission control algorithm.