离散速率条件下的大气激光通信自适应调制编码系统性能

发布时间：2018-01-26 01:39

本文关键词： 光通信大气湍流自适应调制编码频带利用率误码率　出处：《光学学报》2017年07期 　论文类型：期刊论文

【摘要】：针对大气湍流引起的系统频带利用率下降的问题,研究了一种离散速率条件下的大气激光通信自适应调制编码系统。从信号层角度建立了湍流信道模型,给出了湍流信道下的瞬时信噪比概率密度函数,并采用外场实验验证了该信道模型。理论推导了系统频带利用率和误码率表达式,仿真结果表明大气激光通信自适应调制编码系统较传统单一传输模式系统具有优越性。研究了其频带利用率和误码率曲线特性,分析了误码率要求和湍流强度对系统性能的影响。结果表明降低误码率要求可大幅提高系统的频带利用率,且误码率要求越低,湍流强度越弱,频带利用率越高。
[Abstract]:Aiming at the problem of the decrease of frequency band efficiency caused by atmospheric turbulence, an adaptive modulation coding system for atmospheric laser communication under discrete rate is studied. The turbulence channel model is established from the point of view of signal layer. The probability density function of instantaneous signal-to-noise ratio (SNR) in turbulent channel is given, and the channel model is verified by field experiments. The expressions of frequency band efficiency and bit error rate are derived theoretically. The simulation results show that the adaptive modulation coding system for atmospheric laser communication is superior to the traditional single transmission mode system. The effect of BER requirement and turbulence intensity on the system performance is analyzed. The results show that the lower the BER requirement is, the lower the turbulence intensity is. The higher the frequency band efficiency.
【作者单位】：电子工程学院脉冲功率激光技术国家重点实验室;通信信息控制和安全技术重点实验室;
【基金】：国家自然科学基金(61571446) 安徽省自然科学基金(1308085MF83)
【分类号】：TN929.1
【正文快照】： 大气激光通信是一种以激光为载体、以大气为传输媒介的通信技术,综合了光纤通信和其他无线通信方式,具有信息容量大、保密性好、功耗低、体积小和重量轻等优点,在最后1km接入、局域网/城域网扩展、星0706002-1间通信、星地通信和空地通信等领域有着广阔的应用前景[1-3]。然而,

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