Study On Spatial Modulation Based Multiple Input Multiple Output Communication System

Spatial modulation(SM)is a novel technology of the multiple-input multiple-output(MIMO)wireless communication systems.By utilizing the traditional digital modulation symbols and antenna indices for encoding the information bits,SM can reduce the radio frequency(RF)consumption,simplify the hardware structure,reduce power consumption and provide flexible system configuration.Thus,SM attracts substantial research interests,which is consider as one of the promising candidates for the future wireless communication systems.This dissertation focuses on the design of SM-MIMO systems,including the performance analysis for the bit error rate(BER)of SM systems,design of the adaptive algorithms,and optimization of the transmit vectors.The main researches of this dissertation are summarized as follows.For alleviating the problem of high switching frequency of the RF chain in traditional SM systems,this dissertation investigates the offset spatial modulation(OSM)systems,which can reduce the switching frequency of the RF chain by designing the mapping rules between the information bits and the antenna indices.In order to improve the BER performance,the optimal power allocation scheme is proposed for the case of two transmit antennas.For the case that the number of the transmit antennas is larger than two,the dominant error vector(DEV)based low-complexity power allocation scheme is proposed,by successively optimizing the antenna pair corresponding to the minimal Euclidean distance.Furthermore,the iterative convex approximation(ICA)based power allocation scheme is proposed,by utilizing a series of convex problems to approximate the original nonconvex one.Simulation results indicate that the proposed PA algorithms provide considerable improvements compared with the original OSM.This dissertation analyzes the bit error performance of OSM systems in the presence of imperfect channel estimation.Simulation results validate the theoretical analysis and show that OSM provide considerable improvements compared with SM in the presence of imperfect channel estimation.Besides,the bit error performance of OSM in correlated Rayleigh fading channel is studied in this dissertation.Simulation results validate the theoretical analysis and exhibit that the system performance is not sensitive to the correlated fading when the correlated coefficient is lower than 0.5.This dissertation investigates the mimimum mean squared error(MMSE)and zero forcing(ZF)precoding aided receive spatial modulation(RSM)systems.The average bit error performance of MMSE-RSM is analyzed.Simulation results and theoretical analysis illustrate that MMSE-RSM outperforms ZF-RSM.In addition,in order to improve the specific RA configuration in ZF-RSM where the number of receive antennas is a power of two,variable active based ZF-RSM(VA-ZF-RSM)is proposed and the bit error performance of VA-ZF-RSM is analyzed.Simulation results verify the theoretical analysis and demonstrate that VA-ZF-RSM outperforms ZF-RSM in terms of BER performance,while employing arbitrary number of receive antennas.Based on the theoretical analysis for the BER performance of ZF-RSM systems,the optimal power allocation scheme is proposed in this dissertation,in order to improve the BER performance of ZF-RSM systems.By optimizing the BER corresponding to the incorrect detection of the receive antenna indices,a low-complexity power allocation scheme is proposed.Simulation results demonstrate that the systems employing the proposed power allocation schemes outperform the original one and the performance gap between the proposed power allocation scheme reduces with the increasing signal to noise ratio(SNR).The BER performance of ZF-RSM systems with imperfect channel estimation is analysed in this dissertation.In order to improve the BER performance of the considered system,the optimal power allocation between the data and the pilot symbols is derived.Simulation results show that the system employing the proposed power allocation scheme outperforms the original one.The cross-media relaying communication system is investigated in this dissertation.The average outage probability performance of the considered system is analyzed.In order to minimize the outage probability of the considered system,the power allocation sheme at the relay side is proposed.Simulation results reveal that the system employing the proposed power allocation scheme outperforms the original one.The SM based cross-media relaying communication system is proposed in this dissertation.For analyzing the data transmission capability of the considered system,the theoretical mutual information of the system is derived.In order to maximize the mutual information of the considered system,the power allocation scheme at the relay side is proposed.Simulation results show that the system employing the proposed power allocation scheme outperforms the original one.