Research Of Key Technologies In Spatial Modulation Based On Large-scale Array Systems

In recent years,massive multiple input multiple output(MIMO)system has become one of the key technologies of the fifth generation(5G)mobile communication system because of its advantages in transmission reliability,system capacity and spectrum efficiency.However,there are still some problems in massive MIMO systems,such as huge RF overhead,difficult channel estimation,and high complexity of detection algorithm.Spatial modulation(SM)is a promising transmission scheme for massive MIMO systems,which has the advantages of high energy efficiency,low hardware cost and so on.In view of this,this thesis investigates SM technology based on massive MIMO system.Firstly,the SM technology are summarized,including the development of SM scheme,the basic principle and the system model.Several detection algorithms used in SM system are compared,and the BER performance of SM system is analyzed and simulated.Secondly,considering the hybrid structure,a new hybrid massive MIMO SM system based on statistical channel state information is proposed in both single user and multi-user scenarios.Specifically,in the single user scenario,a design criterion of the channel control parameter is provided to reduce the high correlation among different channel coefficients in the hybrid massive MIMO SM system,and the effectiveness of the scheme is verified by simulation.In the multi-user scenario,with the statistical channel state information acquired at the base station,the optimum analogue beamforming vectors are designed to reduce the interference between users and achieve better system performance.Furthermore,the upper bound,the lower bound as well as the closed form approximation of achievable rate of the proposed scheme are derived for both single user and multi-user scenarios.Finally,based on the basic principle of differential SM,a new joint space-frequency modulation(JSFM)scheme is proposed.The principle of JSFM scheme is described in detail,which is applied to hybrid massive MIMO system to establish the model of massive MIMO JSFM system.Then,the algorithm of differential detection at the receiver of the system is studied,and the complexity of the algorithm is analyzed and compared.In addition,compared with the massive MIMO orthogonal frequency division multiplexing(OFDM)system using subcarrier index modulation(SIM),the upper bound of the spectrum efficiency loss in the system is derived and analyzed.In addition,the analysis and simulations of the demonstration system are carried out.The simulation results reveal that in high mobility scenarios,the massive MIMO JSFM system outperforms the massive MIMO OFDM-SIM system which uses maximum-likelihood(ML)detection and minimum mean squared error(MMSE)detection in the high SNR region.