On Optimality of Gamma Approximation for Lognormal Shadowing Models
On Optimality of Gamma Approximation for Lognormal Shadowing Models
复制标题
对数正态阴影模型伽玛逼近的最优性
DOI:
10.1109/lawp.2022.3233522
复制
发表时间:
2023
影响因子:
4.2
通讯作者:
Dang S
中科院分区:
文献类型:
--
作者:
Dang S
In this letter, we study the information-theoretic optimality of the gamma approximation for lognormal shadowing models in order to provide a rigorous mathematical ground for this useful technique. Specifically, we adopt the Kullback–Leibler (KL) divergence as the metric quantifying the distance between the original lognormal and the approximate gamma distributions. The KL divergence resulted from the moment matching criterion, the minimum achievable KL divergence of the gamma approximation, and the statistical parameter mapping relations are all derived in closed form. By these closed-form analytical expressions, we are able to rigorously examine the utility and optimality of the gamma approximation with a benchmark. Comparing the closed-form expressions of the KL divergence by moment matching and the minimum achievable benchmark, we find that the moment matching criterion, as a heuristic method, cannot guarantee the information-theoretic optimality. We also present and discuss the relevant results to substantiate the information-theoretic optimality achieved by our proposed statistical parameter mapping relations and the corresponding analytical insights.
影响因子:
8.3
作者:
Jia Ye;Shuping Dang;Guoqing Ma;Osama Amin;B. Shihada;Mohamed
通讯作者:
Mohamed
影响因子:
8.3
作者:
Carlos F. López;Chengxiang Wang;Y. Zheng
通讯作者:
Y. Zheng
DOI:
--
发表时间:
2003
期刊:
影响因子:
--
作者:
O. Espinosa;V. Moll
通讯作者:
V. Moll