MIMO Communication Reconnaissance And Interference Technology

As an important research direction in the field of communication,communication reconnaissance and interference technology has a very wide range of applications in the actual communication system,especially military communication system.Therefore,communication reconnaissance and interference technology for MIMO signals is undoubtedly a significant research topic.This paper presents a relatively complete scheme of MIMO communication reconnaissance and interference system in a frequency flat fading channel.The scheme includes MIMO transmission antenna number estimation,MIMO blind modulation identification,MIMO communication space-time block code identification and MIMO communication interference technology.The main work of this paper can be summarized as follows.1?First we introduce the basic concepts of MIMO communication and two key technologies involved: diversity technology and reuse technology.In order to realize spatial diversity,we introduce the space-time coding,and then briefly describe the design method of STBC.Finally,after briefly describing of the principle structure of the transmitter and the reconnaissance receiver,we introduce the process of reconnaissance and interference of the MIMO communication system.2?Two classical algorithms for estimating the number of transmit antennas in the additive Gaussian white noise environment are discussed: MDL and AIC,and simulation results show that both algorithms show excellent estimation effect.Then,to solve the problem of classical algorithms' estimation failure under negative SNR,we propose an improved algorithm for MDL algorithm,which greatly improves its estimation effect under negative SNR.3?This paper presents an algorithm of constructing the classification feature statistic by using the high order cumulant,so as to complete the modulation recognition of the MIMO signal.Firstly,the joint approximation diagonalisation of eigen-matrices algorithm is used to separate the source signal from the received signal.Based on the study of the high-order cumulant difference of the source signal under different modulation modes,three classification feature statistics are constructed to complete the blind modulation identification of the MIMO signal with four different modulation modes of BPSK,QPSK,8PSK and 16 QAM.4?Three blind identification methods of space-time block codes based on maximum likelihood are studied.The difference between the computational complexity,the required priori information and the performance of the algorithm is summarized.The simulation results show that the algorithm identification performance is related to the number of reconnaissance antennas,the signal-to-noise ratio and the number of snapshots.5?In the part of MIMO interference technology,the interference of MIMO communication system is studied by using four kinds of interference modes,such as wideband noise interference,pulse interference,tone interference and delayed forwarding interference.The influence of signal parameters on interference effect is observed by simulation experiment.Finally,the interference ability of the four interference modes is compared.