激光跨介质通信中跳时隙的编解码方法

A method of timeslot hopping encoding and decoding in the cross media laser communication

跨介质无线光信道环境下散射吸收效应的出现会产生光强闪烁和光束漂移,造成激光光束传输性能下降,对数据传输产生干扰。为降低信息传输丢失概率、实现快速帧同步,提出一种跳时隙的脉冲位置调制编解码方法,通过研究跳时隙PPM编解码、信息组帧和传输技术,探讨系统实现方案。测试结果表明,采用跳时隙PPM字节组帧的信息传输技术,可进一步提升无线光信号传输抗干扰能力,收发双方依据约定的跳时隙通信规则,包括时隙类型组合、帧同步方式,有利于减小系统信息传输中被截获破译的机率,从而实现快速可靠通信。

Due to the scattering and absorption effect in the cross media wireless optical communication,irradiance scintillation and beam wander are produced,which lead to degradation of laser beam propagation and result in random interference in the transmitted data.To reduce the probability of information loss and realize fast frame synchronization,a method of encoding and decoding for timeslot hopping pulse position modulation(PPM)is proposed.By studying the techniques of encoding,decoding,information framing and transmission for the timeslot hopping PPM,a system implementation scheme is discussed.Experiments have shown that using the frame with one byte data,which was previously modulated by timeslot hopping PPM,to transmit information can further improve the anti interference ability of wireless optical signal transmission.And thus,the timeslot hopping communication protocol agreed by the transmitter and receiver,including timeslot combination and frame synchronization,is useful to reduce interception and crack probability of the information in the transmission and thus achieve fast and reliable communication.