Abstract
This paper presents a characterization of the wireless transmission of biomechanical signals in an embedded system, where a TCP protocol is used in an IEEE 802.11 communications network (Wi-Fi). The embedded system under study, called Imocap, allows the collection, analysis and transmission of biomechanical signals in real-time for various applications, among which the analysis of the movement of the lower and upper extremities and the operation of various control systems stand out. To accomplish this, Imocap is equipped with a Wi-Fi transceiver module (ESP8266) and various input and output peripherals. The wireless communication performance of Imocap, exposed in this paper, was analyzed through different tests in miscellaneous conditions like indoors, outdoors and in the presence of interference, noise and other wireless networks. The different test protocols conducted result in the Imocap system: 1) has a maximum effective range of 45.6 m when in Access Point mode; 2) has a maximum effective range of 44.3 m when in Station mode. In indoors and under the same conditions, the Imocap system: 3) has a maximum effective range of 81.25 m2, either Access Point or Station mode. The results showed that the transmission of biomechanical information through Wi-Fi using the TCP protocol is efficient and robust, both indoors and outdoors, even in environments of radio frequency interference. The use of this protocol is emphasized since its use allows the transmission of packages to be carried out in a controlled manner, allowing the error handling and recovery. In this way, it is possible to carry out efficient and robust wireless communication through embedded and portable devices, focusing mainly on areas such as medicine, telemedicine and telerehabilitation.
Highlights
The current technological revolution and the appearance of low-cost and highperformance electronic components have allowed the design and manufacture of embedded devices for the fulfillment of specific tasks
Given the results obtained through the development of the test protocols, it is concluded that the transmission of biomechanical information through Wi-Fi using
For an indoor work environment, the signal maximum range when the Imocap system is in Access Point (AP) mode is enough to transmit data to a nearby device where a better-quality signal is obtained by it being in the same space as the receiving device
Summary
The current technological revolution and the appearance of low-cost and highperformance electronic components have allowed the design and manufacture of embedded devices for the fulfillment of specific tasks. Systems that capture the mechanical movement of the human body are used in different diagnostic processes [9, 10] and are based on various technologies [11,12,13] Within this group, those systems built with magnetic and inertial sensors stand out due to their low-cost and high-performance technical features. The architecture of the Imocap signal acquisition platform, developed by the GIS Software Research Group of the Pedagogical and Technological University of Colombia, is described This platform integrates the most robust characteristics of an inertial-magnetic system and the data transmission in real-time via Wi-Fi. To contextualize the main elements addressed in this research, the information below exposes aspects such as the method used to review the literature, relevant works on the use of wireless networks in the medical field and general information on wireless motion capture systems based on inertial and magnetic technology. In [42], a capillary oxygen saturation and motion monitoring device is presented, using a system for capturing and transmitting data through Zigbee
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