M-QAM调制下高空平台OFDM光链路误码性能

发布时间：2018-01-07 07:33

本文关键词：M-QAM调制下高空平台OFDM光链路误码性能　出处：《电子测量与仪器学报》2017年05期 　论文类型：期刊论文

【摘要】：针对Gamma-Gamma分布大气湍流效应、几何传播损耗和指向误差联合效应对空间激光链路性能的影响,研究了高空平台OFDM光链路通信模型的误码性能。建立了基于M-QAM调制的高空平台OFDM光链路通信模型,获得了OFDM光链路的载波噪声比,推导出总平均误码率的闭合表达式。仿真分析了在不同大气湍流强度、QAM调制阶数、抖动标准差和波束宽度等参数条件下,链路误码率与发射功率的关系。研究结果表明,在弱湍流条件或归一化抖动标准差小于0.6时,增大发射功率对链路误码率性能的改善程度较为缓慢;不同QAM调制阶数或归一化波束宽度条件下,增大发射功率对链路误码率性能的改善程度不明显。
[Abstract]:According to the Gamma-Gamma distribution of the effects of atmospheric turbulence, affect the geometry of the propagation loss and the pointing error of the combined effects of space laser link performance, the BER performance of the HAPS OFDM optical link communication model was established. OFDM optical link communication model of high altitude platform based on M-QAM modulation, the OFDM optical link carrier to noise ratio, is closed the general expressions of the average bit error rate. The simulation analysis under different atmospheric turbulence intensity, QAM modulation order, jitter standard deviation and beam width and other parameters, the relationship between the link error rate and transmit power. The results show that, in the weak turbulence condition or normalized jitter standard deviation is less than 0.6, the increase rate of improvement on the performance of link error transmission power is relatively slow; different QAM modulation order or normalized beam width conditions, improve the degree of increase rate on the performance of link error transmitting power It's not obvious.

【作者单位】：空军工程大学信息与导航学院;重庆通信学院;94326部队通信修理所;
【基金】：陕西省自然科学基金(2015JM6060)、陕西省自然科学基金(2016JM6073)资助项目
【分类号】：TN929.1
【正文快照】： 1引言高空平台(high altitude platform,HAP)主要位于普通航空飞机的飞行空间和航天器轨道间,离地面约17~25 km,具有载荷大、造价低、对地面准静止、布设机动灵活、滞留时间长等优点[1-3],成为构建垂直分层多域的空间信息网络节点的重要组成部分。在临近空间中,HAP所处的空间

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