Modeling And Simulation Of Aviation Fading Channel

Aviation channel is the radio propagation channel between the artcrafts and ground controllers. With the development of aviation wireless service, researching and designing the new generation of aviation wireless communication system is becoming more and more urgenter. To assist the research of the new generation of aviation wireless communication system, it is indispensable to research the character of the aviation channel intensively, and to develop the simulation model of the aviation channel.Through summarizing the existing literature, the second chapter of this paper will divide the air channel into five scenarios, including anchor, taxi, take-off/landing, cruise and fly through the tower, and give the delay power spectrum and doppler power spectrum of each scenario, namely, to establish the reference model of the multi-scene air channel.In order to establish broadband statistical model of aviation fading channel-tap delay linar model, the second chapter of this paper found the model of the channel delay power spectrum and doppler power spectrum with the method of harmonic superposition and doppler filtering.If the simulation time is limited, the sample function of the superposition of harmonic model will not traverse the statistic characteristics of random model, thus the simulation time of harmonic superposition model needs to be long enough, which increases the time complexity of the model. Therefore, the third chapter of this paper improve the simulation method of harmonic superposition, use the equidistance method to build the model, and set the simulation time near a series of local minimum value of the time-limit relative deviation function of the model. The Analysis and simulation against the aviation channel show, this method can greatly reduce the required simulation time under the premise of ensuring the time limit of model in good time performance.In addition, this paper select doppler filtering method based on FFT to simulate doppler power spectrum, and when the doppler power spectrum is narrow band spectrum, doppler filter order number will be very high, which makes the complexity of the doppler filtering model extremely high. Therefore, in the fourth chapter of this paper, the doppler filtering method based on FFT are improved, which firstly construct filter for the doppler frequency shift power spectrum, and then compensate the deviation in time domain for the output of the doppler filter. The Analysis and simulation against the aviation channel show, this method can reduce the order of filter to a reasonable order under the premise of guarantee model the statistical properties of good performance, thus reduce the calculation complexity of the aviation model.Finally the fifth chapter of this paper build the simulation module of multi-scene broadband air channel based on Matlab, and the channel parameters of simulation module can be flexibly configured, which makes the use of wireless communication system link more convenient. The simulation module performance tests show that the simulation module has good performance of the time-limit time-related characteristic and the frequency of related features. At last, this paper set up the semi-physical simulation platform based on the EB F8 channel emulator carrier aviation channel, the test results of which show that the simulation model established in this paper of the multi-scene broadband air channel still has good statistical properties.Finally, the sixth chapter of this paper present the conclusion of the whole text and the research advice of the next stage.