QPSK调制光通信中混合噪声的功率谱性能与误码率

发布时间：2018-03-11 07:12

本文选题：激光通信　切入点：QPSK调制　出处：《红外与激光工程》2017年10期 　论文类型：期刊论文

【摘要】：研究了QPSK副载波调制下乘性噪声与加性噪声对接收端星座图影响。基于GammaGamma信道模型,分析了乘性噪声和加性噪声影响下系统的接收星座图。通过仿真实验计算了混合噪声情况下的星座图分布以及接收端功率谱密度。讨论了混合噪声条件下,不同能见度、传输距离对系统误码率的影响。结果表明:随着湍流强度的增强,接收端功率谱存在明显的展宽迹象;不同加性噪声条件下,当能见度小于传输距离时,气溶胶粒子散射为影响通信的主要因素。不同乘性噪声条件下,当能见度处于0.5~1.5 km时,乘性噪声会影响接收光强,进一步增大系统误码率。文中工作对真实环境下降低无线激光通信的误码率和提高通信质量有重要意义。
[Abstract]:The effects of multiplicative noise and additive noise on the constellation diagram of the receiver under QPSK subcarrier modulation are studied. Based on the GammaGamma channel model, The received constellation diagram of the system under the influence of multiplicative noise and additive noise is analyzed. The constellation distribution and the power spectral density of the receiver under mixed noise are calculated by simulation experiments. The different visibility under mixed noise is discussed. The effect of transmission distance on the bit error rate of the system. The results show that with the increase of turbulence intensity, there are obvious signs of broadening of the power spectrum at the receiving end, and under different additive noise conditions, when the visibility is less than the transmission distance, Aerosol particle scattering is the main factor affecting communication. Under different multiplicative noise conditions, multiplicative noise will affect the received light intensity when visibility is 0.5 ~ 1.5 km. The work in this paper is of great significance to reduce the bit error rate of wireless laser communication and improve the communication quality in real environment.
【作者单位】：西安理工大学自动化与信息工程学院;
【基金】：国家自然科学基金(61377080) 陕西省重点产业创新链项目(2017ZDCXL-GY-06-01)
【分类号】：TN929.1

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