大气光通信联合调制传输系统的应用研究  

The Application Research of Atmospheric Optical Communication in Joint Modulation Transmission System

作　　者：邓乐坤 何宁[1] 吴晨晨 吴越 DENG Le-kun;HE Ning;WU Chen-chen;WU Yue(School of Information and Communication,Guilin University of Electronic Technology,Guilin 541004,China)

机构地区：[1]桂林电子科技大学信息与通信学院,广西壮族自治区桂林541004

出　　处：《光通信研究》2021年第6期28-32,共5页Study on Optical Communications

基　　金：国家自然科学基金资助项目(61961008);广西无线宽带通信与信号处理重点实验室主任基金资助项目(GXKL06180101)。

摘　　要：针对无线光通信(WOC)技术高频谱效率以及低误码率的需求,文章提出了一种脉冲幅度调制(PAM)与脉冲位置调制(PPM)联合的调制方法,在传统调制技术的基础上充分利用无线通信带宽资源提高了传输速率。系统采用空域映射(SM)方式将不同幅度脉冲映射至特定激光器,并通过映射关系完成多链路分层传输。与传统单调制方式相比,联合调制技术通过编码机制的协调配合,利用脉冲的幅度以及所在时隙位置的变化来传递信息。实验测试证明,采用联合调制分层传输技术,通过同时发送和检测每个数据脉冲的时隙位置及幅度信息,不仅提升了系统频谱效率和传输速率,误码性能也得到了有效改善,实验结果为后续应用研究提供了一种新的技术途径。Aiming at the demand of high spectrum efficiency and low bit error rate of Wireless Optical Communication(WOC) technology, a joint modulation method of Pulse Amplitude Modulation(PAM) and Pulse Position Modulation(PPM) is proposed. The method makes full use of wireless communication bandwidth resources, which can improve transmission rate compared with traditional modulation technology. The system maps different amplitude pulses to specific lasers using Space Mapping(SM), and realizes multi-link layered transmission mapping relation. Being different from the traditional single-modulation methods, the joint modulation method uses the amplitude of the pulse and the change of the time slot position to transmit information through the coordination of the coding mechanism. The time slot position and amplitude information of each data pulse are sent and detected at the same time, using the joint modulation layered transmission technology. The experimental results demonstrate that the proposed method not only improves both spectral efficiency and transmission rate, but also improves the error performance. The experimental results provide a new technical method for the subsequent application research.

关 键 词：无线光通信 空域映射 脉冲幅度调制 脉冲位置调制 频谱效率 误码率 

分 类 号：TN929.12[电子电信—通信与信息系统]