航空电子MB-OFDM-UWB无线互连信道分析与仿真

The Multi-Band Orthogonal Frequency Division Multiplexing Ultra WideBand (MB-OFDM-UWB) is one of the communication systems for Wireless Avionics Intra-Communications (WAIC). Unlike indoor wireless channels, UWB ideband signals have complex reflection and multipath interference in metal and composite cabins. In this paper, a physical layer scheme of the MB-OFDM-UWB wireless communication system suitable for WAIC application is presented, and according to the IEEE802.15.4a standard, a multi-cluster and multi-path UWB channel model adapted to the internal characteristics of avionics cabin is proposed. The impulse response of the wireless channel is simulated based on the reflection angle error method of the receiving sphere, and the cluster arrival rate, path arrival rate, and mixing factor of the channel model in the cabin environment are determined. Then the MB-OFDM-UWB signal system simulation using Simulink is carried out. The results show that under the code rate of 110 Mb/s, the signal-to-noise ratio in the cabin environment should be 1 dB higher than that in the normal indoor environment when the bit error rate is lower than 10^-6 specified in the International Telecommunications Union(ITU) standard. In addition, in order to confirm the validity of the receiving sphere radius in electromagnetic simulation, the simulation results are compared with the measured results in the reference environment.