Research On D2D Wireless Resource Management Based On Cellular Network And NOMA Technology

Massive users will access the mobile network at that time when 5G is commercially available in 2020;the users' requirements of the communication rate and the communication quality are exploding.The 5G technology come into being when the 4G technology can not meet the user's higher communication requirements.Compared to 4G,5G can upgrade 100 to 1000 times the communication rate.Based on the improvement of system communication capacity,the research of NOMA and D2 D for 5G key candidate technologies are explored in this thesis.Firstly,the background and the current situation of the research are summarized.The concept of NOMA technology and D2 D technology are briefly introduced.The key technologies used in NOMA communication system such as SIC,power domain multiplexing,Turbo coding and LDPC coding are introduced emphatically.The technical characteristics of NOMA and OFDMA are analyzed in detail.Then,the resource allocation algorithm of D2 D communication system based on cellular users is studied,and several common resource allocation algorithms are analyzed.In order to reduce the interference caused by reusing channel between cellular users and D2 D users,an improved resource allocation algorithm is proposed.The algorithm establishes the resource allocation rule,allocates the dedicated communication resources after allocating the multiplexed communication resources,and the D2 D users which makes the larger interference to the cellular users are not allowed to access the communication system.The simulation results show that the proposed algorithm can effectively reduce the interference between the cellular user and the D2 D user,and at the same time increase the number of D2 D users accessing the communication system to the maximum extent.Finally,the communication model of NOMA technology and D2 D technology is analyzed,and the problem planning and solving process of each model are described in detail.Improve the existing bilateral matching resource allocation algorithm,making the access system D2 D user cluster number is increased to achieve the purpose of improving the capacity of the communication system.The simulation results show that the proposed algorithm can be close to the best algorithm's communication effect to maximum extent compared with serveral other algorithms.