低仰角地空通信抗衰落传输体制的设计仿真

Design and Simulation of an Anti-fading Mechanism of Low-elevation Ground-air Communication

地空通信是一种重要的通信手段,可跨越复杂地形并实现远距离的应急通信。文章针对地空信道的信道特性,在2Mbps地空通信系统的设计中,采用了带内两频与自适应判决反馈均衡器相结合的抗多径措施,将该系统在多径信道模型中进行了性能仿真,并与带内二重分集在相同信道条件下的误码性能进行了仿真比较,最后提出适合于低仰角地空通信的一种抗衰落体制。

The ground-air communication is an important comrmmication manner, which can be used in emergency communication over long distance and across complex terrain. Aiming at the characteristics of ground-air communication channel, in the design of the 2Mbps ground-air communication system, this paper adopts the anti-multipath method combined double-frequency and adaptive decision feedback equalizer. The performance simulation is performed in multipath channel model, and the BER performance simulation comparison is performed with in-band two-diversity in the same channel condition. Finally, the paper proposes an anti-fading mechanism for low-elevation ground-air communication.