| Autor: |
Li, Wenda, Tan, Bo, Xu, Yangdi, Piechocki, Robert J. |
| Zdroj: |
IEEE Sensors Journal; 7/1/2018, Vol. 17 Issue 2, p5413-5421, 9p |
| Abstrakt: |
Physical activity recognition is an important research area in pervasive computing because of its importance for e-healthcare, security, and human–machine interaction. Among various approaches, passive radio frequency sensing is a well-tried radar principle that has potential to provide the unique solution for non-invasive activity detection and recognition. However, this technology is still far from mature. This paper presents a novel hidden Markov model-based log-likelihood matrix for characterizing the Doppler shifts to break the fixed sliding window limitation in traditional feature extraction approaches. We prove the effectiveness of the proposed feature extraction method by K-means & K-medoids clustering algorithms with experimental Doppler data gathered from a passive radar system. The results show that the time adaptive log-likelihood matrix outperforms the traditional singular value decomposition, principal component analysis, and physical feature-based approaches, and reaches 80% in recognizing rate. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
