空间光通信自适应编解码技术研究

Link Adaptive and Hybrid Error Correcting Design for Free Space Optical Communication

空间光通信受到大气湍流影响的衰落时间可持续数毫秒,严重影响通信系统的可靠性。提出了一种适合于空间光通信的自适应编解码方案,并且给出了具体的实现方法。针对信道当前不同的状况,采取不同的编解码方案降低系统的误码率。并且采取阈值切换的方法,避免了由于信道状况在设计阈值周边波动时出现的编解码方案频繁切换的现象。经过MATLAB仿真,验证了该方案的可行性。

FSO system suffers from atmosphere turbulences, and the fading time can lasts for several microseconds, which affects the communication system severely. A new hybrid error correcting protocol for FSO is proposed in this paper, as well as the way of implementation. Proper transmission method is adopted to reduce the bit error rate, for the changing channel condition. And the double-threshold switching method successfully avoids the side effects caused by channel condition chan- ging above or below the single threshold frequently. Finally, the practicability of this method is proved by MATLAB simula- tion.