PPM无线光通信同步技术研究

Study of synchronization in optical PPM communication

PPM无线光通信的关键问题之一在于时隙时钟与帧同步信号的恢复。通过比较目前国内外的一些无线光通信的同步技术,分别给出了积分型数字锁相环法时隙时钟恢复方案和一种简单易行的帧同步信号提取方法,并在QuartusⅡ中建立了VHDL模型,给出了仿真结果。最后,将该方法在PPM调制解调系统中进行应用验证,得到了比较好的结果。

One of the most critical points in optical PPM radio communication lies on the recovery of slot clock and frame synchronization signal. On the base of studying the PPM, several synchronization techniques were compared and a type of slot clock recovery principle based on integrated DPLL and a simple kind of frame signal recovery method was given separately, and then the VHDL model was built in Quatus II and simulation results were given. Finally, the methods were used in PPM modulation and de-modulation systems, and the result give good verifications on the method.