Research On Enhanced Generalized Orthogonal Space Modulation Techniques

In modern society,there is an increasing demand for higher data rate communication systems.In the field of Multiple Input Multiple Output(MIMO),Index Modulation(IM)technology,as an innovative way of transmitting information,has unique advantages in terms of spectrum,energy efficiency,and hardware simplicity.IM has become a new research hotspot in recent years and is one of the most competitive candidate technologies for future wireless networks.As the pioneer of IM technology,Spatial Modulation uses the index of the transmitting antenna to carry additional information bits without consuming any additional energy.Generalized quadrature spatial modulation is based on spatial modulation using two sets of antenna combinations to respectively transmit the in-phase and quadrature components of the modulation symbol.However,the low utilization of the antenna combination will result in low spectrum and energy efficiency.In order to meet higher performance requirements,the paper carried out the following research:(1)First of all,in order to improve the spectrum and energy efficiency of generalized orthogonal spatial modulation,in view of the shortcomings of generalized orthogonal spatial modulation,by introducing a variable number of radio links,exploring more antenna combinations to carry more data bits,combined with power saving strategy,two enhanced generalized orthogonal spatial modulation techniques are proposed,namely independent and joint.And through MATLAB simulation to demonstrate their advantages over traditional generalized orthogonal spatial modulation in terms of spectrum efficiency,energy efficiency and bit error rate.In addition,the spectrum,energy efficiency,application scenarios,advantages and disadvantages of the two enhanced methods are also compared.(2)Secondly,in order to improve the user service equity,spectrum efficiency,energy efficiency and bit error rate performance of the single relay multi-terminal cooperative network in real life scenarios,the independent enhanced generalized orthogonal spatial modulation and Non-orthogonal Multiple Access(NOMA)technology are combined to study the joint application of spatial index domain and power domain.Bit error rate is compared with independent enhanced generalized orthogonal space modulation based on orthogonal multiple access technology,and the feasibility of independent enhanced generalized orthogonal space modulation based on non-orthogonal multiple access in improving service equity index is verified.(3)Finally,the Inter-symbol Interference(ISI)channel is suitable for block transmission.Two two-dimensional space-time block enhanced generalized orthogonal spatial modulation methods are proposed,which are independent and joint respectively.In addition to using the antenna index combination of in-phase and orthogonal spatial domain,the combination of in-phase and orthogonal time-slot index is also used to carry extra bits of information.The spectrum,energy efficiency and bit error rate performance of the two two-dimensional space-time block methods are simulated using MATLAB,and the feasibility of the two two-dimensional space-time block methods is verified.