Dhatchayeny Durai Rajan, Arya Sudhanshu, Chung Yeon Ho
Department of Information and Communications Engineering, Pukyong National University, Busan 48513, Korea.
Sensors (Basel). 2019 May 18;19(10):2297. doi: 10.3390/s19102297.
In this paper, a patient mobility support scheme for indoor non-directed optical body area networks (OBAN) is presented. The OBAN is an optical healthcare system where medical sensors are installed on various parts of the patient's body and are connected to an optical coordinator for transmitting the physiological signals via optical wireless links. In the proposed scheme, a white light-emitting diode (LED) was employed as the optical coordinator that was mounted on the patient body, while a photodetector (PD) was used as the receiver installed at the ceiling. We considered three practical mobility scenarios in terms of the location of the coordinator: (i) Shoulder, (ii) wrist, and (iii) both shoulder and wrist. The analytical channel model for multiple reflections in a non-directed OBAN was developed and validated in the form of simulations. In addition, experiments were carried out to verify the effectiveness of the proposed mobility scheme. It was found that the third scenario (shoulder and wrist) performed best, showing a bit error rate (BER) of 1.2 × 10 at a distance of 1.25 m. The experimental results demonstrated that the proposed mobility support scheme in the OBAN added an additional degree of freedom to patients with reliable performances.
本文提出了一种用于室内非定向光学体域网（OBAN）的患者移动性支持方案。OBAN是一种光学医疗保健系统，其中医疗传感器安装在患者身体的各个部位，并连接到光学协调器，用于通过光学无线链路传输生理信号。在所提出的方案中，采用白光发光二极管（LED）作为安装在患者身体上的光学协调器，而将光电探测器（PD）用作安装在天花板上的接收器。我们根据协调器的位置考虑了三种实际移动场景：（i）肩部，（ii）手腕，以及（iii）肩部和手腕。针对非定向OBAN中的多次反射，开发了分析信道模型并通过仿真进行了验证。此外，还进行了实验以验证所提出的移动性方案的有效性。结果发现，第三种场景（肩部和手腕）表现最佳，在1.25 m的距离处误码率（BER）为1.2×10 。实验结果表明，所提出的OBAN移动性支持方案为患者增加了额外的自由度，且性能可靠。
