The modulation scheme of ultrasonic communication using capacitive micromachined ultrasonic transducers, acting as the transmitted port and received port, was simulated and experimented with four parallel channels in silicone oil. Four channel signals were coded by a steady and reliable binary amplitude shift keying method such as on–off keying modulation. The modulation scheme was simulated with additive Gaussian noise and attenuated for every channel in silicone oil, and the sound attenuation influence was evaluated with different distances. The capacitive micromachined ultrasonic transducers were measured to achieve a −6 dB bandwidth of 305 kHz when operating in silicone oil. The channels were operated at different frequencies ranging from 300 kHz to 600 kHz with a channel spacing of 100 kHz. The bit rate of 50 kbps for one channel was achieved with a data rate of 200 kbps over a short-range distance of 0.1 m. The proposed correction coefficient could be used to adjust the threshold. The high overall signal-to-noise ratio of 29.41 dB ensured the system to have a low-level bit error rate.

利用硅油中的四个平行通道，对电容式微机械超声换能器作为发送端口和接收端口的超声通信调制方案进行了仿真和实验。通过稳定可靠的二进制幅度移位键控方法（例如开-关键控调制）对四个通道信号进行编码。通过加性高斯噪声对调制方案进行了仿真，并对硅油中的每个通道进行了衰减，并评估了不同距离下的声音衰减影响。在硅油中工作时，电容式微加工超声换能器经测量可实现305 kHz的-6 dB带宽。这些通道以300 kHz至600 kHz的不同频率工作，通道间隔为100 kHz。一个通道的50 kbps比特率是在0.1 m的短距离距离上以200 kbps的数据速率实现的。建议的校正系数可用于调整阈值。29.41 dB的高总体信噪比确保系统具有较低的误码率。