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针对传统的激光通信系统误码率高、抗干扰能力差的问题,本文在研究脉冲位置调制PPM(Pulse Position Modulation)的工作原理及特点的基础上,设计了一种以现场可编程逻辑器件FPGA(Field Programmable Gate Array)为控制核心的高速PPM调制激光通信系统。从实际出发,利用FPGA的高速并行性特性完成了PPM调制解调系统的设计,在调制系统中设计了帧同步以保证信息的同步,对于解调部分,系统利用FPGA内部的动态相位调整电路DPA(Dynamic Phase Alignment)来达到对PPM信号的时隙同步。经实验验证:系统能很好的对信号进行PPM编码,且能正确解调出原信息。该系统为后续的激光通信系统设计有很好的参考价值。
Aiming at the problem of high bit error rate and poor anti-jamming performance of the traditional laser communication system, this paper studies the working principle and characteristics of Pulse Position Modulation (PPM) based on the design of a field programmable gate array (Field Programmable Gate Array) as the control core of high-speed PPM modulation laser communication system. From a practical point of view, the design of PPM modulation and demodulation system is accomplished by utilizing the high-speed parallelism of FPGA. The frame synchronization is designed in the modulation system to ensure the synchronization of information. For the demodulation part, the system uses the dynamic phase adjustment circuit DPA (Dynamic Phase Alignment) to achieve the time slot synchronization PPM signal. The experimental verification: the system can be a good signal PPM coding, and can correctly demodulate the original information. The system for the follow-up laser communication system design has a good reference value.