可变基频激光通信链路传输信道建模研究

Research on modeling of transmission channel of variable fundamental frequency laser communication link

可变基频激光通信系统可突破循环频率的限制,改善激光通信的传输通用性质与传输速度,为此,构建可变基频激光通信链路传输信道模型,为全面研究激光通信系统传输特性提供基础。采用幅度键控(ASK)调制激光通信链路信道的基频,ASK帧结构使用简单帧格式、8 bit数据位确保激光通信系统基频可变;以此为前提构建可变基频激光通信链路传输信道模型,从模型中获取激光通信链路传输信道的干扰量、信道带宽以及接收端信号模型,为分析激光通信信道特性提供依据。仿真研究显示:ASK调制编码可有效调节激光通信系统的基频,采用该模型传输信息大大降低通信误码率、优化信道传输性能。

Variable fundamental frequency laser communication system can break through the restriction of cyclic frequency and improve the general nature and transmission speed of laser communication. To this end,a transmission channel model of variable fundamental frequency laser communication link is constructed,which provides a basis for comprehensive study of transmission characteristics of laser communication system. The fundamental frequency of laser communication link channel is modulated by amplitude keying (ASK),and the fundamental frequency of laser communication system is guaranteed to be variable by using simple frame format and 8 bit data bits in ASK frame structure.Based on this,a variable fundamental frequency laser communication link transmission channel model is constructed,and the interference amount,channel bandwidth and receiver signal model of laser communication link transmission channel are obtained from the model. The characteristics of communication channel provide the basis. The simulation results show that ASK modulation and coding can effectively adjust the fundamental frequency of laser communication system. Using this model to transmit information can greatly reduce the communication error rate and optimize the channel transmission performance.