Takizawa Kenichi, Aoyagi Takahiro, Hamaguchi Kiyoshi, Kohno Ryuji
National Institute of Information and Communication Technology, 3-4 Hikarino-oka, Yokosuka 239-0847, Japan.
Annu Int Conf IEEE Eng Med Biol Soc. 2009;2009:6897-900. doi: 10.1109/IEMBS.2009.5333613.
This paper presents a performance evaluation of wireless communications applicable into a capsule endoscope. A numerical model to describe the received signal strength (RSS) radiated from a capsule-sized signal generator is derived through measurements in which a liquid phantom that has equivalent electrical constants is used. By introducing this model and taking into account the characteristics of its direction pattern of the capsule and propagation distance between the implanted capsule and on-body antenna, a cumulative distribution function (CDF) of the received SNR is evaluated. Then, simulation results related to the error ratio in the wireless channel are obtained. These results show that the frequencies of 611 MHz or lesser would be useful for the capsule endoscope applications from the view point of error rate performance. Further, we show that the use of antenna diversity brings additional gain to this application.
本文介绍了适用于胶囊内窥镜的无线通信性能评估。通过使用具有等效电常数的液体仿真模型进行测量，得出了一个用于描述胶囊大小信号发生器辐射的接收信号强度（RSS）的数值模型。通过引入该模型并考虑胶囊方向图的特性以及植入式胶囊与体表天线之间的传播距离，评估了接收信噪比的累积分布函数（CDF）。然后，获得了与无线信道误码率相关的仿真结果。这些结果表明，从误码率性能的角度来看，611 MHz及以下的频率将对胶囊内窥镜应用有用。此外，我们表明天线分集的使用为该应用带来了额外的增益。
