| Title | The Short-Time Fourier Transform based WiFi Human Activity Classification Algorithm |
| Publication Type | Conference Paper |
| Year of Publication | 2021 |
| Authors | Lin, Yier, Tian, Yin |
| Conference Name | 2021 17th International Conference on Computational Intelligence and Security (CIS) |
| Keywords | Activity Classification, Classification algorithms, Fourier transforms, Metrics, principal component analysis, pubcrawl, resilience, Resiliency, Scalability, security, short-time Fourier transform, Support vector machines, Time Frequency Analysis, time-domain analysis, Time-frequency Analysis, WiFi signal, Wireless fidelity |
| Abstract | The accurate classification of WiFi-based activity patterns is still an open problem and is critical to detect behavior for non-visualization applications. This paper proposes a novel approach that uses WiFi-based IQ data and short-time Fourier transform (STFT) time-frequency images to automatically and accurately classify human activities. The offsets features, calculated from time-domain values and one-dimensional principal component analysis (1D-PCA) values and two-dimensional principal component analysis (2D-PCA) values, are applied as features to input the classifiers. The machine learning methods such as the bagging, boosting, support vector machine (SVM), random forests (RF) as the classifier to output the performance. The experimental data validate our proposed method with 15000 experimental samples from five categories of WiFi signals (empty, marching on the spot, rope skipping, both arms rotating;singlearm rotating). The results show that the method companying with the RF classifier surpasses the approach with alternative classifiers on classification performance and finally obtains a 62.66% classification rate, 85.06% mean accuracy, and 90.67% mean specificity. |
| DOI | 10.1109/CIS54983.2021.00015 |
| Citation Key | lin_short-time_2021 |
The Short-Time Fourier Transform based WiFi Human Activity Classification Algorithm