分层调制联合物理层网络编码下协作自由空间光通信系统的误码率性能  

Bit Error Rate Performance of Cooperative Free Space Optical Communication System with Hierarchical Modulation and Physical Layer Network Coding

作　　者：秦怀军 曹阳 彭小峰 张祖鹏 Qin Huaijun;Cao Yang;Peng Xiaofeng;Zhang Zupeng(School of Electrical and Electronic Engineering,Chongqing University of Technology,Chongqing 400054,China;Periodical Agency of Chongqing University of Technology,Chongqing 400054,China)

机构地区：[1]重庆理工大学电气与电子工程学院,重庆400054 [2]重庆理工大学期刊社,重庆400054

出　　处：《激光与光电子学进展》2023年第17期126-133,共8页Laser & Optoelectronics Progress

基　　金：重庆市教委基金(KJ120827);重庆市教委科学技术项目(KJ1500934,KJ1709205);重庆市研究生科研创新项目(CYS18311);重庆市基础与前沿研究计划项目(cstc2015jcyjA40051);重庆市教委青年科技研究项目(KJQN202101124)。

摘　　要：针对非对称协作自由空间光通信系统中信道条件得不到充分利用以及高阶调制导致的数据可靠性恶化问题,提出了一种分层调制联合物理层网络编码方案。该方案首先在信源节点处对待发送信息进行数据优先级划分,并给不同优先级的数据分配不同比例的发射功率;然后将调制后的数据发送至各个节点,并在中继节点处对接收到的数据进行物理层网络编码;最后中继节点将编码后的信息发送至目的节点,目的节点利用物理层网络编码方案恢复出原始信息。仿真结果表明,在高信噪比信道中,系统误码率可下降至10-8以下;在强大气湍流信道中,使用该方案系统至少可获得1.5 dB的信噪比增益。该方案对强大气湍流信道表现出更好的抗干扰性能。A hierarchical modulation joint-physical layer network coding scheme is proposed to address the problems of incomplete channel condition utilization in asymmetric cooperative free space optical communication system and deterioration of data reliability due to high-order modulation.In this scheme,the information to be transmitted is classified first in data priorities at the source node followed by the allocation of transmission powers of different proportions to the prioritized data.Subsequently,the modulated data are sent to each node,and physical layer network coding is performed on the received data at the relay node.Finally,the relay node sends the encoded information to the destination node,and the destination node recovers the original information using the physical layer network coding scheme.The simulation results show that the bit error rate(BER)of the system can be reduced to values<10−8 in high-signal-to-noise ratio(SNR)channels.The system can achieve SNR gains≥1.5 dB by using this scheme in the intense atmospheric turbulence channel.This scheme yields better antijamming performance in intense atmospheric turbulence channel cases.

关 键 词：光纤光学与光通信 协作自由空间光通信系统 数据优先级 分层调制 物理层网络编码 强湍流 

分 类 号：TN929.12[电子电信—通信与信息系统]