In our daily life, inadvertent scratching may increase the severity of skin diseases (such as atopic dermatitis, etc.). However, peopleudrarely pay attention to this matter, so the known measurement behavior of the movement is also very little. Nevertheless, the behavior andudfrequency of scratching represent the degree of itching, and the analysis of scratching frequency is helpful to the doctor's clinical dosage. In thisudpaper, a novel system is proposed to monitor the scratching motion of a sleeping human body at night. The core device of the system are just audLeaky coaxial cable (LCX) and a router. Commonly, LCX is used in the blind field or semi blind field in wireless communication. The new idea isudthat the leaky cable is placed on the bed, then the state information of physical layer of wireless communication channels is acquired to identify theudscratching motion and other small body movements in the human sleep process. The results show that it can be used to detect the movement and itsudduration. Channel state information (CSI) packet is collected by card installed in the computer based on the 802.11n protocol. The characterizationudof the scratch motion in the collected channel state information is unique, so it can be distinguished from the wireless channel amplitude variationudtrend.
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