Pathloss modeling for in-body optical wireless communications

Stylianos E. Trevlakis, Alexandros-Apostolos A. Boulogeorgos, N. Chatzidiamantis
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Abstract

Optical wireless communications (OWCs) have been recognized as a candidate enabler of next generation in-body nano-scale networks and implants. The development of an accurate channel model capable of accommodating the particularities of different type of tissues is expected to boost the design of optimized communication protocols for such applications. Motivated by this, this paper focuses on presenting a general pathloss model for in-body OWCs. In particular, we use experimental measurements in order to extract analytical expressions for the absorption coefficients of the five main tissues’ constitutions, namely oxygenated and de-oxygenated blood, water, fat, and melanin. Building upon these expressions, we derive a general formula for the absorption coefficient evaluation of any biological tissue. To verify the validity of this formula, we compute the absorption coefficient of complex tissues and compare them against respective experimental results reported by independent research works. Interestingly, we observe that the analytical formula has high accuracy and is capable of modeling the pathloss and, therefore, the penetration depth in complex tissues.
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体内光无线通信的路径损耗建模
光无线通信(OWCs)已被认为是下一代体内纳米级网络和植入物的候选推动者。能够适应不同类型组织的特殊性的精确信道模型的开发有望促进针对此类应用的优化通信协议的设计。基于此,本文重点提出了一种用于体内OWCs的通用路径损失模型。特别是,我们使用实验测量来提取五种主要组织成分(即含氧和无氧血液、水、脂肪和黑色素)的吸收系数的解析表达式。在这些表达式的基础上,我们推导出了评估任何生物组织吸收系数的一般公式。为了验证该公式的有效性,我们计算了复杂组织的吸收系数,并将其与各自独立研究工作报告的实验结果进行了比较。有趣的是,我们观察到解析公式具有很高的准确性,并且能够模拟路径损失,因此能够模拟复杂组织中的穿透深度。
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