Air-CSL: Chinese Sign Language Recognition Based on the Commercial WiFi Devices

Table 1

Description of eigenvalues.

Feature name	Feature description
Skewness	Measure the direction of skew, degree of skew, and asymmetry of the data distribution, expressed as Equation (7)
Kurtosis	The number of characteristics that indicate the peak height of the probability density distribution curve at the mean is expressed as Equation (8)
Standard deviation	The square root of the squared and averaged data deviation from the mean is expressed as Equation (9)
Peak-to-peak value	The value of the difference between the highest and lowest values of the signal in a period is expressed as Equation (10)