Research On Interleaver-division Multiple Access In Future Mobile Communication

Multiple access(MA)is a key technology for cellular mobile communications,which can distinguish users on different wireless resources to prevent interference between users and maximize the resource utilization.According to the division of wireless resources in different dimensions,each generation of mobile communication standards has its signature multiple access technology.In recent years,with the prosperity and development of new generation mobile communications,the requirements for spectrum utilization have become higher and higher.Non-orthogonal multiple access(NOMA)technology has received widespread attention.The purpose of this article is to study the interleave-division multiple access(IDMA)technology.Interleave-division multiple access technology is one of the earliest proposed non-orthogonal multiple access technologies,which has the characteristics of high spectral efficiency and high receiver detection efficiency.Based on the needs of future mobile communications,this paper proposes an optimized detection technology through the research of interleave-division multiple access technology firstly.Secondly,the extension methods combined with new MIMO such as spatial modulation is proposed.The structure of this paper is as follows.The first chapter summarizes the development of multiple access technology in cellular systems,introduces the advantages and disadvantages of orthogonal multiple access and NOMA,and gives the research background of interleave-division multiple access.There are also research status of various related technologies.Finally,the content and structure of this paper are summarized.The second chapter introduces the transmitter and Turbo iterative detection structure of the interleave-division multiple access system,including the traditional iterative detection algorithm based on the elementary signal estimator(ESE).In order to improve the system performance,an iterative detection algorithm based on coordinate descent method(CDM)is proposed.The simulation results compare and analyze the algorithm performance from different dimensions,and verify that the iterative detection algorithm based on CDM has faster convergence speed and better system performance in the case of multiple receiving antennas.The third chapter introduces the basic principle of orthogonal frequency division multiplexing(OFDM),and the IDMA system combined with OFDM.Simulation results compare the CDM-based and the ESE-based detection algorithm performances in OFDM-IDMA system.In order to improve the spectrum utilization of the system,a new OFDM-IDMA structure that can reduce the cyclic prefix(CP)is proposed in this paper,and its effectiveness is verified by simulation.The fourth chapter studies the traditional spatial modulation(SM)and space shift keying(SSK)from the perspective of improving the transmission performance of the new modulation system,and proposes an improved spatial modulation and space shift keying scheme.Based on the idea of interleave-division multiple access,a new superposition coded modulation(SCM)scheme combined with SM technology is verified.The fifth chapter summarizes the full text,and gives the future research direction and work plan.