超声透金属通信的简化频域信道模型

Simplified frequency-domain channel model of ultrasonic through-metal communication

针对已有的超声透金属通信信道模型较为复杂的问题,提出了一种简化的频域信道模型.利用超声在金属墙中传播的指数衰减特性和回波等时间间隔特性,推导出超声在金属墙中传播的频率响应,然后将频率响应与用高斯函数近似表示的压电换能器幅频特性相结合,最后通过缩放系数和平移系数对频率响应进行了修正,得到了超声透金属通信的简化频域信道模型.利用有限元仿真验证了超声在金属墙中传播的特性,并将所提简化模型与已有的模型进行了比较,结果表明:两种模型中金属墙、换能器及整体信道的幅频曲线都相接近,验证了所提简化模型的准确性.

A simplified frequency-domain channel model was proposed to address the complexity of the existing channel model for ultrasonic through-metal(UTM)communication.The frequency response of ultrasonic propagation in the metal wall was derived by utilizing the exponential attenuation characteristic and equal time interval characteristic of echoes.To approximate the amplitudefrequency characteristic of the piezoelectric transducer,the frequency response was combined with a Gaussian function.Subsequently,the combined frequency response was modified using scaling and shift coefficients to obtain the simplified frequencydomain channel model for UTM communication.Finite element simulation was conducted to verify the characteristics of ultrasonic propagation in the metal wall.The proposed simplified channel model was compared to the existing UTM channel model.Results demonstrate that the amplitude-frequency curves of the metal wall,the transducer and the overall channel in the proposed simplified model closely match those of the existing model,which verifies the accuracy of the proposed simplified model.