Research On Physical Layer Technology Of Civil Airplane Satellite Mobile Communication

In recent years, aeronautical satellite mobile communication is one of the most popular hotspots focused on by air-framers and airlines in the field of commercial aircraft. Especially the application of aeronautical satellite mobile communication has been gradually extended from traditional air traffic control (ATC), air operation control (AOC) and air administration communication (AAC) to air public communication (APC), i.e. the voice and data connectivity services oriented to passengers.As one of the branches of the wireless communication channel, aeronautical satellite mobile communication channel differs from ordinary land satellite mobile communication, or air-to-ground wireless communication channel. This article describes a tapped delay line (TDL) model for the aeronautical satellite mobile communication channel based on ITU-R P.682-3<Propagation data required for the design of Earth-space aeronautical mobile telecommunication systems>. The model consists of four paths, of which the1st LOS path and the2nd path of fuselage echo without delay can be considered as a Rice fading process; the3rd path of fuselage echo with delay as the combination of Rayleigh fading process and relevant slow fading process; the4th path of ground echo as the combination of Rayleigh fading process and relevant slow fading process. This article describes the channel by deterministic process models and models the channel via Matlab, and relevant verification proofs are provided.A study has also been made on the air interface physical layer of the aeronautical satellite mobile communication and put forward an OFDM-based communication system including channel encoding and decoding, modulation and demodulation, and synchronization,.etc. The system has been modeled and simulated via Matlab. Meanwhile, this article analyses the system performance in the channels of both AWGN and aeronautical satellite mobile communication, and pays more attentions on the system performance affected by aircraft altitude, satellite elevation and channel encoding. In the end, this article researches the improvement of the PAPR reduction.