Channel correlation in aperture receiver diversity systems for free-space optical communication
Channel correlation in aperture receiver diversity systems for free-space optical communication
复制标题
自由空间光通信孔径接收机分集系统中的信道相关性
DOI：
10.1088/2040-8978/14/12/125710
复制
发表时间：
2012-12-01
影响因子：
2.1
通讯作者：
Gu, Wanyi
中科院分区：
文献类型：
--
作者：
Chen, Zhixiao;Yu, Song;Gu, Wanyi
在接收机分集系统中，如果分量接收机没有足够的间隔，则信号副本将受到信道相关性的影响。了解信道相关性对于系统性能评估和改进非常重要。本文对接收分集系统中的信道相关性进行了理论研究。基于平面波模型和扩展的Rytov理论，导出了一般大气条件下的ABCD射线矩阵形式的信道相关表达式。详细研究了天线间距、湍流强度、接收器孔径大小和波长对结果的影响，并讨论了相应的物理机制。给出了强湍流条件下估计信道相关长度的近似公式。
In receiver diversity systems, signal replicas will suffer from channel correlations if there are insufficient spacings for component receivers. Knowledge of the channel correlation is important for system performance assessment and improvement. In this paper, we give a theoretical study of the channel correlation in receiver diversity systems. Based on the plane-wave model and the extended Rytov theory for the ABCD ray-matrix formulation, expressions for the channel correlation are derived under general atmospheric conditions. The effects of antenna spacing, turbulence strength, receiver aperture size, and wavelength are examined in detail and the corresponding physical mechanisms for the results are discussed. An approximation for estimating the channel correlation length under strong turbulence conditions is obtained.