用于人体胸部植入传感器的超宽带统计传播信道模型
Ultra-wideband statistical propagation channel model for implant sensors in the human chest
AI总结：
研究针对人体胸部植入传感器的超宽带传播信道，基于含人体组织介电特性的异质解剖模型进行数值模拟，提出统计模型并给出相关数学公式，分析20mm和80mm深度情况，结果利于体内医疗通信系统设计。
AI中文摘要：
植入式医疗无线传感器用于监测生理参数、自动给药等，是一项很有前景的医疗技术。超宽带（UWB）无线电的固有特性使其非常适合植入式传感器的无线接口。通信信道模型对开发这些无线系统至关重要，但目前描述人体内部无线电传播的模型很少。为解决此问题，提出了一种1-6GHz频率范围内人体胸部UWB传播信道的统计模型。该模型基于包含不同人体组织频率相关介电特性的异质解剖模型的数值模拟开发。描述了计算胸部不同深度路径损耗、散射和信道冲激响应统计实现的数学公式。详细分析了胸部植入传感器的两个典型深度，即20mm和80mm。在每种情况下，平均路径损耗分别约为20dB和50dB。此外，两种情况下信道的均方根时延扩展均低于1ns，时间色散很小。这些结果有助于体内医疗通信系统的设计任务。
英文摘要：
Implant medical wireless sensors for monitoring physiological parameters, automatic drug provision, and so on represent a new promising healthcare technology. Inherent characteristics of ultra-wideband (UWB) radio make this technology highly suitable for the wireless interface of implant sensors. A communication channel model is essential for developing these wireless systems. However, there are currently few models describing the radio propagation inside the human body. To address this problem, a statistical model is presented for UWB propagation channels inside the human chest in the 1-6 GHz frequency range. The proposed statistical model is developed from numerical simulations using a heterogeneous anatomical model that includes the frequency-dependent dielectric properties of different human tissues. Mathematical formulas for the computation of path loss, scattering and the statistical implementation of the channel impulse response at different depths inside the chest are described. Two typical depths for implanted sensors in the chest, namely 20 and 80 mm are analysed in detail. Average path loss of approximately 20 and 50 dB is observed in each case, respectively. Moreover, the channel exhibits little time dispersion with a root-mean-square delay spread below 1 ns in both cases. These results aim at facilitating the tasks associated with the design of in-body medical communication systems.
