Research On Joint Index Modulation Technology Of MIMO System

In recent years,with the development of index modulation technology,5G communication expects to bring higher spectrum efficiency and energy efficiency.Index modulation technology provides additional information bits through resource indexing.so it has attracted extensive attention of people.At present,the research of index modulation technology mainly includes space shift keying?SSK?,spatial modulation?SM?,generalized spatial modulation?GSM?,code index modulation?CIM?and sub-carrier index modulation?SIM?et al,all of which are one-dimensional index modulation technology.However,the research on two-dimensional joint index modulation is still in the initial stage.Therefore,It is of great significance that the research on two-dimensional joint index modulation to promote the progress of index modulation and wireless communication technology.The traditional SSK modulation needs to arrange a large amount of antennas when increasing the transmission rate of the system,and the antenna arrangement increases exponentially with the increase of the transmission rate.It is obvious that the arrangement with a large amount of antennas can improve the transmission rate of the system,but will consume too much physical resources,and the implementation cost of the system will also increase.However,SM and GSM have some problems,such as low efficiency of antenna,low transmission rate and so on.Therefore,in order to solve the problems of consuming a lot of physical resources and low transmission rate,two joint index modulation techniques are proposed in this thesis,and the two-dimensional joint index modulation techniques are studied accordingly.To solve the problem of numerous antennas are arranged to increase the system transmission rate for the SSK technique,a new index modulation scheme named space-code index modulation?SCIM?is proposed in this thesis.The new proposed SCIM combines SSK and M-ary spread spectrum?M-ary SS?technology to transmit information with the index of antennas and the spread spectrum code.In this scheme,spread spectrum code is used to replace a part of antenna indexes.When the transmission rate of the system is increased,the number of transmit antennas is greatly reduced compared with SSK.The simulation and analysis show that,with a consistent spectral efficiency,the SCIM proposed in this thesis has about 2dB improvement of performance under the condition that the bit error rate is 10^-5,and it saves a lot of index resources compared with SSK.To solve the problems like the SM antenna has a low utilization and the GSM has a low transmission rate,a generalized space-code joint index modulation?GSCJIM?is proposed in this thesis.The scheme combines the GSM and the CIM to from a two-dimensional joint index modulation,which effectively improves the transmission rate and antenna utilization of the system.The simulation and analysis show that when keeping same spectrum efficiency,the proposed GSCJIM has around a 5dB performance improvement at bit error rate of 10^-3.In this thesis,two joint two-dimensional index modulation schemes are proposed by combining the existing antenna index modulation and the spread spectrum code index modulation.It not only enriches the existing index modulation methods in wireless communication,but also alleviates the problem that a large number of antennas required for SSK when increasing the system transmission rate.In addition,the proposed schemes can alleviate the problems of SM antennas have low utilization rate and the GSM has low transmission rate.What's more,this study provides a theoretical reference for further study of index modulation technology.