摘要
无线光纤通信中的信号调制方式多采用单一的脉冲幅度调制技术,传输距离短、信息容量有限、制约系统数据信息传输速率。提出一种基于双重调制技术的光纤通信系统设计,介绍了前端接收模块、变频处理模块、A/D转换模块、FGGA控制模块、USB总线输出模块等系统的硬件构成;在调制识别算法方面提升传统脉冲幅度的调制级别,改善传输速率;引入脉冲宽度调制技术,并对双重调制频谱特征进行了详细分析,在信号断开的状态下,仍然保持较高的数据传输速率,在一定程度上降低了码间干扰程度。实验结果证明提出的系统设计能够有效提高数据传输速率、降低系统误码率、具有良好的适用性。
Wireless signal modulation mode in optical fiber communication adopted single pulse amplitude modulation technology,which has the defects such as short transmission distance,limited information capacity and restricted system data transmission efficiency.Therefore,this paper put forward a kind of optical fiber communication system design based on double modulation technology.It introduces the front-end receiver module,frequency processing module,A/D switching module,FGGA control module,USB bus output module and other system hardware; Increase the traditional pulse amplitude modulation level,improve the transmission rate in terms of modulation recognition algorithms; Introduce the pulse width modulation technology and analyze the double modulation frequency spectrum characteristics in detail.Keep high data transmission rate in the condition of broken signal to reduce the intersymbol interference certainly.The experimental results show that the proposed system design can effectively improve data transmission rate,reduce the system ber,and has good applicability.
出处
《激光杂志》
北大核心
2017年第10期77-80,共4页
Laser Journal
基金
基金项目:2016河南省科技厅基础与前沿技术研究(162300410188)
关键词
无线
光纤通信
双重调制
脉冲幅度
脉冲宽度
wireless
optical fiber communication
double modulation
pulse amplitude
pulse width
