Research For MIMO System With Spatial Modulation And Precoding

With the development of wireless communication and the increasing number of mobile phone,providing users with ubiquitous high-quality communication services is the fundamental driving force for the development of wireless communication field technology.But the limitations and scarcity of wireless spectrum resources makes the design of reliable communication system with high-speed become a hot spot in currently research of wireless communication.As the core technology for next generation wireless communication,MIMO systems can achieve better performance compared with traditional single input single output(SISO)technology,at the same case of configuration,power consumption and spectrum bandwidth.Owing to massive MIMO with multiple transmit antennas and multiple receive antennas,the detection complexity is greatly improved at receiver.In order to reduce the detection complexity without any loss of diversity gain and on the condition of the channel state information(CSI)is known at receiver,we designed a MIMO system,which is based on MMSE precoding technology to select suitable receive antennas in this paper.Spatial modulation(SM)technology can not only carry information through traditional modulation symbols,but also by selecting the spatial location of transmit antenna to carry information.Therefore,SM can transmit more bit information with less required number of transmit antennas.In order to improve the BER performance of spatial modulation MIMO communication system,a scheme with linear block code based to design transmit antenna constellation is proposed.In this paper,(5,2)Hamming code with minimum code distance 2 and 3 is designed as an example,respectively.Thesimulation results show that when at the same rate,the multiple antennas communication system this paper proposed outperform literature [27] with a low requirement of energy,and save the hardware cost with less number of transmit link.In order to improve the BER performance of MIMO system further,the MIMO communication system with better BER performance,which is based on the existence theory,spatial modulation,precoding technology,linear block code and antenna selection algorithm,and designed in this paper.The MIMO system proposed in this paper uses the addition auxiliary transmit antenna to send the code word.The capacity is be calculated under the Rayleigh fading channel.And the simulation results show that at the same premise of transmit power,the multiple-antenna auxiliary spatial modulation MIMO system can achieve about 4.8 dB compared with the traditional SM-MIMO system at BER410-.