| 5G technology not only has a high transfer rate,but also can achieve the green low-carbon energy consumption.MIMO technology can make full use of frequency resources,but it has the disadvantages of low energy efficiency,channel interference and high decoding complexity.Space modulation(SM)technology can not only improve the existing problems of traditional MIMO technology,but also promote 5G technology.Based on the demand of 5G technology and the improved MIMO technology,this paper deeply studies the principle and detection algorithm of SM technology and its application in 5G.The main research work of this paper mainly includes:Firstly,the basic theory of wireless channel model,traditional MIMO technology and SM is studied,and the advantages and disadvantages of SM are summarized.Through the theoretical exploration of the traditional SM and the generalized SM,the modulation method and system scheme are studied respectively,and the performance of each system is analyzed and compared.Secondly,this paper studied a low-complexity M-ML width-first detection algorithm for SM system.Simulation showed that the M-ML algorithm with ideal M value has no significant influence on the SER,and reduced the algorithm complexity greatly.Aiming at improving M-ML,an optimization algorithm based on the noise power of receiving antenna is proposed.The simulation showed that the improved algorithm can further reduce the complexity of detection algorithm.Finally,this paper studied the basic principle of cooperative communication.Through the cooperative diversity technology,each node shares each other's antenna to obtain the spatial diversity gain and improve the performance of the system.In addition,this chapter proposed the cooperative communication model based on SM,and verified the feasibility by simulation.SM technology has been further improved and promoted through the research. |
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