相关信道中光多输入多输出系统的误码率

发布时间：2018-03-17 09:43

本文选题：光通信　切入点：多输入多输出　出处：《光学精密工程》2016年09期 　论文类型：期刊论文

【摘要】：多输入多输出(MIMO)技术可以在不额外增加频谱资源和发射功率的条件下成倍提高通信系统的信道容量,但子信道间存在的空间相关性会影响光MIMO无线通信系统(OWC)的性能。本文研究了对数衰落信道中空间相关性对光MIMO系统误码率的影响。针对脉冲位置调制(PPM)方式,采用指数相关模型推导出了光MIMO通信系统在不同相关机制下的对数振幅衰落系数矩阵和最大似然检测准则。然后,采用Wilkinson近似方法推导出了该条件下光MIMO系统误码率的上界。最后,利用仿真实验进一步分析了空间相关性对OWC MIMO系统误码率的影响。结果表明:空间相关性的存在使得OWC MIMO系统的性能恶化,且随着收发天线数量的增加,空间相关性会导致系统误码率恶化加剧。因此在实际工程应用中要合理放置天线,尽量减小天线之间的相关性,以便更好地发挥MIMO系统的优势。
[Abstract]:Multiple-Input-Multiple-Output (Mimo) technology can multiply the channel capacity of a communication system without adding additional spectrum resources and transmit power. However, the spatial correlation between subchannels will affect the performance of optical MIMO wireless communication system. In this paper, the influence of spatial correlation on the bit error rate of optical MIMO system in logarithmic fading channel is studied. The logarithmic amplitude fading coefficient matrix and maximum likelihood detection criterion of optical MIMO communication system under different correlation mechanisms are derived by using exponential correlation model. The upper bound of bit error rate (BER) of optical MIMO system under this condition is derived by using Wilkinson approximation method. Finally, The effect of spatial correlation on the bit error rate of OWC MIMO system is further analyzed by simulation experiments. The results show that the performance of OWC MIMO system deteriorates with the existence of spatial correlation, and with the increase of the number of antennas, Spatial correlation will worsen the bit error rate of the system, so it is necessary to reasonably place the antenna in practical engineering, and reduce the correlation between antennas as much as possible, so as to give full play to the advantages of MIMO system.
【作者单位】：兰州理工大学计算机与通信学院;
【基金】：国家自然科学基金资助项目(No.61465007,No.61265003) 兰州理工大学博士基金资助项目(No.14-0232)
【分类号】：TN929.1;TN919.3

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