The Simulation Model Of Aeronautical Channel And Its Application

As the aviation enterprise develops, aeronautical communication attracts more and more attention and it will play a more important role in wireless mobile communication in the future. In the aeronautical communication, the rapid speed of the aircraft causes that the received signal suffers a lot from the multipath fading of the aeronautical channel. As a result, it is of great importance to build accurate, efficient and reasonable aeronautical channel models.This paper presents the simulation model of the aeronautical channel and its application. The main work in this paper is as follows:1. This paper studies the characters of the wireless channel, and mainly analyzes the speed of the mobile station in the communication environment, the frequency of the electric wave, the time selective fading character and the frequency selective fading character of the wireless channel. Based on this, the propagation characteristic of the aeronautical channel is specifically studied. According to the different state of the aircraft, the aeronautical channel consists of four different scenarios: en-route scenario, arrival and takeoff scenario, taxi scenario and troposcatter communication scenario, and the characters of large scale fading and small scale fading of each of the four scenarios were analyzed, such as the path loss, the fading depth, the fading rate, the Doppler power spectrum and the delay power spectrum.2. In the aeronautical communication, the channel models of the four different scenarios are separately built and simulated. The computer simulation result shows that the theory analysis agree with the experiment, and it proves the efficiency and rationality of the channel model.3. This paper studies the traditional SC-FDE system in the aeronautical channel models (four scenarios) and simulates it. Because of the bad transmission performance of the aeronautical channel, the traditional SC-FDE system has bad performance and can not satisfy the communication system. The improved SC-FDE system based on Turbo coding is proposed in this paper, and the simulation of the improved system in the four different scenario channels is analyzed and compared. The simulation result proves the efficiency of the improved system, and it has better transmission performance even in more complicated aeronautical channel and satisfies the communication, For example, in the channel of the arrival and takeoff scenario, the proposed improved SC-FDE system can achieve lower BER performance with 10?6 in the condition of low SNR.4. In order to further improve the transmission quality of the SC-FDE system, this paper studies the timing synchronization, and proposes a new timing synchronization method and simulated it in four different scenario channels. The results show that, in different aeronautical channels, the intrinsic Schmidl&Cox method has obviously plateau effect and it is not accurate for symbol timing synchronization. The new method in this paper can overcome the shortage in the Schmidl&Cox method in which the length of the peak value is large and it is difficult for symbol timing, and the new method can do better and more reliably in the symbol timing synchronization.