# Monitoring of [PERSON]'s Disease Based on Wireless Sensing Technology
## 4 The Experimental Scheme  
The purpose of this article is to continuously monitor patients with HD. To distinguish the patient's actions from other normal daily movements, so as to provide an objective clinical diagnosis basis for doctors and facilitate doctors to make appropriate treatment plans. The experimental flow chart is shown in Figure 3.  
This experiment will collect the data of several actions like normal standing, normal sitting, normal walking, standing of HD, sitting of HD, and gait of HD, as shown in Table 1.  
The simulation experiment was carried out in a laboratory in the new science and technology building of Xidian University, which is 7 m \(\times\) 5 m in size. The transmitting and receiving antennas of the MSP were respectively placed at two ends of the laboratory, with a horizontal distance of 4 m. The transmitting antenna and receiving antenna were positioned 1.8 m from the ground and 1.2 m from the ceiling. The transmitting module of the MSP was composed of a control computer with a  
\begin{table}
\begin{tabular}{c c} \hline No. & Action \\ \hline
1 & Normal \\
2 & Normal sitting \\
3 & Normal walking \\
4 & Standing of HD \\
5 & Sitting of HD \\
6 & Gait of HD \\ \hline \end{tabular}
\end{table}
Table 1: The actions used in the experiment.  
Figure 3: The experiment flow chart.  
wireless adapter and an omnidirectional antenna. The wireless adapter was configured in an injection mode for sending wireless signals. The receiving module of the MSP consisted of a control computer with a wireless adapter and three omnidirectional antennas. The wireless adapter was configured in a listening mode for receiving signals and extracting CSI data. The MSP operated in C-band (4.8 GHz) and used OFDM technology to modulate the signal with a total of 30 subcarriers. The signal bandwidth was set at 20 MHz. The transmitting antenna had a packet frequency of 200 Hz, and the time window was 12 s. We collected 300 samples for each action. The experimental scene is shown in Figure 4.  
In Figure 4c, the object moves in a direction perpendicular to the line connecting the transmitter and receiver, mainly considering that if the object moves along the line from the transmitter to the receiver, the line-of-sight transmission will be weakened, and most of the energy will be lost, resulting in a reduction of signal amplitude at the receiver, which is not conducive to any kind of communication. At the same time, in clinical trials, the movement tasks of patients are usually specified, so we chose a movement mode that is more conducive to study the feasibility of the technical scheme described in this article.  
In this work, our research focuses on the feasibility of using wireless sensing technology to monitor HD patients, and the number of HD patients is very small [23]; hence, we did not recruit real patients, but volunteers from our team simulated HD movements.  
Before the experiment, we fully informed the experimental participants of all relevant matters and contents of the clinical experiment. By watching videos of clinical manifestations of HD patients and reading related literature, all experimental participants were rigorously trained to simulate real HD patient movements.  
Due to the limited staff in our team, there were a total of 10 volunteers who participated in our experiment, including 6 males and 4 females, aged between 24 and 48 years. Details of volunteers are shown in Table 2.  
Figure 4: The experimental scene: (**a**) standing; (**b**) sitting; (**c**) walking.  
We randomly selected 5 volunteers (3 male and 2 female) to simulate the movements of HD patients, and the remaining 5 volunteers (3 male and 2 female) were used as normal reference. Each set of actions was repeated 60 times for each volunteer, and it took 6 days to collect the data.