Spatio-Temporal Correlation of Interference in MANET Under Spatially Correlated Shadowing Environment
Spatio-Temporal Correlation of Interference in MANET Under Spatially Correlated Shadowing Environment
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DOI：
10.1109/tmc.2019.2959990
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发表时间：
2019-12
影响因子：
7.9
通讯作者：
Tatsuaki Kimura;H. Saito
中科院分区：
文献类型：
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作者：
Tatsuaki Kimura;H. Saito
干扰的相关性影响着各种无线移动系统的时空方面，如重传、多天线和协同中继。本文研究了相关阴影环境下移动自组网中干扰的时空相关性。将节点位置建模为泊松点过程，采用i.i.d迁移模型，并考虑Gudmundson（1991）的空间相关阴影模型，从理论上分析了对数正态阴影的相关距离与干扰的时空相关系数之间的关系。由于相关系数的精确表达式是难以处理的，我们得到了它们的简单渐近表达式，随着对数正态阴影方差的增加。通过数值算例，我们发现渐近展开式可以作为紧密近似公式，对空间相关阴影下的一般无线系统建模很有用。
Correlation of interference affects spatio-temporal aspects of various wireless mobile systems, such as retransmission, multiple antennas and cooperative relaying. In this paper, we study the spatial and temporal correlation of interference in mobile ad-hoc networks under a correlated shadowing environment. By modeling the node locations as a Poisson point process with an i.i.d. mobility model and considering Gudmundson (1991)'s spatially correlated shadowing model, we theoretically analyze the relationship between the correlation distance of log-normal shadowing and the spatial and temporal correlation coefficients of interference. Since the exact expressions of the correlation coefficients are intractable, we obtain their simple asymptotic expressions as the variance of log-normal shadowing increases. We found in our numerical examples that the asymptotic expansions can be used as tight approximate formulas and useful for modeling general wireless systems under spatially correlated shadowing.