基于OOK调制的FSO半盲信道估计方法研究（毕业学术论文设计）.docx

基于OOK调制的FSO半盲信道估计方法研究 OOK modulation-based the FSO semi-blind channel estimation method  毕业论文 题 目 基于OOK调制的FSO半盲信道估计方法研究  摘要 无线光通信结合了微波通信和光通信的优势，具有高带宽、高必威体育官网网址性、低功耗等优点，但是，无线激光通信技术的广泛应用受到了很多问题的制约，其中最主要的问题之一就是大气信道对无线光通信的影响。本文针对这一问题，首先分析了大气对光传输所产生的两种效应——大气衰减效应和大气湍流效应，其中，大气衰减效应使光信号功率随距离增加而迅速下降，大气湍流效应产生的光强起伏则影响了信号的正确接收。然后针对大气信道的特点和信道估计理论知识提出了基于OOK调制下的FSO半盲信道估计算法。最后对其算法进行了MATLAB仿真，分析了观察窗长度不同情况下信号误码率的变化。在观察窗长度不同的情况下，随着信噪比的增大，误码率下降，观察窗长度越大，误码率下降越明显。在信噪比相同的情况下，观察窗长度越大，误码率越小。 关键字：无线光通信，大气信道，信道估计，开关键控 Abstract Wireless optical communication technology integrates the advantages of microwave communication and optical communication, has the merits of high bandwidth, fine secrecy and low power, utilizes light wave with frequency of hundreds of terahertz to transmit and have a bright future because of its high transmission speed and no requirement for traditional spectral bandwidth resource. Nevertheless, wireless optical communication technology still has many problems which limit its development, the primary one of which is the influence of atmosphere channel on wireless laser communication. Firstly, this paper analyze two effect that atmosphere exerts on optical communication. The one is atmosphere attenuation effect which sharply reduces the power of optical signal when the transmission distance increases; the other one is the atmospheric turbulence effect which produces optical intense fluctuation and influences correctly receiving signal. Moreover, OOK modulation-based FSO semi-blind channel estimation algorithm and the characteristics of the atmospheric channel and channel estimation of theoretical knowledge. Finally, their algorithm MATLAB simulation and analysis of changes in the signal bit error rate in the observation window length under different circumstances. Different observation window length, with increasing signal to noise ratio, bit error rate decreased, the greater the length of the observation window, the b