Gamma-Gamma湍流下新型脉冲位置调制性能分析  

Performance Analysis of Novel Pulse Position Modulation under Gamma-Gamma Turbulence

作　　者：肖冬亚 钟月曦 安喆 XIAO Dongya;ZHONG Yuexi;AN Zhe(School of Electrical Engineering and Information Technology,Changchun Institute of Technology,Changchun 130012,China;School of Mechanical Engineering and Technology,Changchun Institute of Technology,Changchun 130012,China)

机构地区：[1]长春工程学院电气与信息工程学院,长春130012 [2]长春工程学院机电工程学院,长春130012

出　　处：《光子学报》2023年第11期65-78,共14页Acta Photonica Sinica

基　　金：吉林省自然科学基金(No.YDZJ202201ZYTS428);吉林省教育厅科技项目(No.JJKH20230708KJ);长春工程学院人才引进计划(No.01130292019019),长春工程学院学校科研创新团队项目(No.320230003)。

摘　　要：为改进脉冲位置调制方式的性能,结合差分脉冲位置调制和多脉冲位置调制的优势,提出一种新型差分脉冲位置调制方式。在给出其符号结构的基础上,分析了其传输容量、带宽需求和功率需求,推导出Gamma-Gamma湍流信道下自由空间光通信系统的平均误时隙率和误包率模型,仿真分析了湍流强度、传输距离和调制阶数对该系统性能的影响,并将其与开关键控和三种脉冲位置调制方式进行比较。理论分析与仿真结果表明,新型差分脉冲调制方式比单脉冲位置调制、差分脉冲位置调制和多脉冲位置调制具有更高的传输容量,比单脉冲位置调制和差分脉冲位置调制具有更低的带宽需求,比多脉冲位置调制和开关键控具有更高的功率利用率和更好的差错性能,而且不需要符号同步,可以简化系统实现的复杂度。The Intensity Modulation/Direct Detection(IM/DD)s ystem is s imple a nd e asy to implement,which is most widely used in Free Space Optical(FSO)communication.Its typical modulation schemes include On-off Keying(OOK),L-level Pulse Position Modulation(LPPM),Differential Pulse Position Modulation(DPPM)and Multiple Pulse Position Modulation(MPPM),Digital Pulse Interval Modulation(DPIM),etc.OOK is the simplest modulation scheme to implement,but the power utilization is too low and the anti-interference ability is poor.LPPM has superior power utilization at the expense of a large amount of bandwidth.Also the transmission capacity is difficult to meet the requirements of FSO communication,and strict symbol synchronization is required during demodulation,which increases the complexity of the system.DPPM improves the bandwidth utilization relatively and does not require symbol synchronization.But redundant“0”time slots are still generated in the coding process,which makes this modulation scheme not high enough in transmission capacity and bandwidth utilization.MPPM further improves the bandwidth utilization,nevertheless the error performance is poor.And strict symbol synchronization is required which increases the complexity of the system.In order to improve the performance of the traditional PPM schemes,a Novel Differential Pulse Position Modulation(NDPPM)scheme is proposed in this paper,combining with the advantages of DPPM without symbol synchronization and high bandwidth utilization of MPPM.A novel differential pulse position modulation scheme named NDPPM is proposed in this paper.The mapping relationship and symbol structure of NDPPM are studied,the modulation performance is analyzed and compared with other modulation schemes.The average time slot error rate and packet error rate models of FSO communication system under Gamma-Gamma turbulent channel are derived.According to the derived models above,the error performance simulation is carried out.The influence of turbulence intensity,transmission distance and modul

关 键 词：光通信 自由空间光通信 脉冲位置调制 大气湍流 误时隙率 误包率 

分 类 号：TN929.1[电子电信—通信与信息系统]