Authors: Zhuo Yuedong, Li Qiao, Lu Guangshan, Wu Junjie
From: Acta Aeronautica et Astronautica Sinica(in Chinese)
Abstract: Wireless avionics intra-communications (WAIC) wideband intra-connection can be achieved by using multi-antenna wireless local aera networks (WLAN). In avionics cabin, the reflection of signals between cabin structure and avionics equipment racks is the main factor causing multipath fading. Moreover, the correlation between received signals from different antennas generally cannot be disregarded when multiple-input multiple-output (MIMO) transmission is per-formed. In this paper, a three-dimensional model is established according to the arrangement geometric relationship and material properties of the avionics equipment racks and equipment. The signal propagation path in avionics cabin is simulated using the reflection angle error method of the receiving sphere. For different avionics equipment installation density conditions, simulations are performed considering uniform linear and circular antenna signal reception scenarios respectively. Cluster-based data preprocessing is used to derive the multi-cluster multipath channel model, as well as the WAIC channel characteristics of the avionics cabin described by multipath fading and time delay distribution. The MIMO channel transmission matrix and the impact of inter-receiver antenna correlation on channel performance are obtained through statistical analysis. The simulation analysis shows that the channel conditions can be approximated using fully loaded channel parameters when the installation density of avionics equipment is greater than 60%. The simulation analysis method presented in this paper provides a reference for the analysis and design of MIMO wireless transmission characteristics near avionics equipment racks.