## 1 Introduction
A WBAN utilizes the Remote Restorative Telemetry Administrations (WMTS), unlicensed Modern, Logical, and Therapeutic (ISM), Ultrawideband (UWB), and Therapeutic Embed Correspondences Administration (MICS) groups to transmit information. The Government Correspondence Commission (FCC) desires the use of WMTS for therapeutic applications since there are fewer interfering sources. Another option for therapeutic applications is to use the 2.4-GHz band ISM, which contains monitoring groups to ensure the impedance of the channel. An authorized MICS band (402-405 MHz) is provided for embedded correspondence [32]. UWB can follow an IEEE802.15.4, resulting in a high data transmission rate of up to 6.8 Mbit/s and an excellent communication range of up to 300 m based on coherent reception techniques. WBA requires the acquisition of an IMU 3D accelerometer, gyroscope, and magnetic sensors, as well as insole data from a number of body points, and strict real-time transmission to the corresponding WBA controller at a predetermined frequency of 100 Hz with low jittering at the master controller's receiving location [9; 10; 13; 33; 34]. Data transmission should be fast to accommodate larger amounts of data from a cluster of sensors. The star topology might require five IMU units, with two IMU units specifically for collecting insole data and the main node for control and data transfer. The ideal IMU unit would be small, enable wireless data transmission, and be battery powered so that it could operate for at least several hours. The wireless IMU unit should also be capable to automatically go into low-power sleep mode after a period of inactivity. All these main parameters were unavailable at the beginning of the CL ++ project, neither as a commercially available device or system, nor as a research device. During the research work the system was developed as hardware and firmware and integrated into a larger system as WBAC. The WSA overview and the main development results are presented in this paper. The main contribution and innovation of this work is a precise insight into WSA hardware and firmware capable of sampling 100 Hz in real time. The experimental evaluation of the WSA incorporates the confirmation of the data transfer timing using the supply current profile, it was found that the best placement for the master unit is at the top of the backpack, packet loss was verified for data transmission in four scenarios from laboratory to city streets, while operational performance was experimentally confirmed in the presence of other microwave signals. The article is organized as follows. After the introduction, the methods section describes the WSA hardware and a reasonable part of the operating principles. Next, the experimental protocols are presented to (i) determine the optimal location of the master unit on the control backpack, (ii) evaluate the communication performance in the laboratory, in a public hall and in an urban environment, and (iii) investigate the acquisition of raw signals while walking. The results are presented in the form of tables and figures for all three protocols. All the test protocols are interpreted in the Discussion section, which finally converge in a Conclusion section.