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However, the existing CSI-based activity recognition algorithms need a large number of training samples to obtain the ideal recognition accuracy. To solve the problem, an attention-based bidirectional LSTM method using multidimensional features (called MF-ABLSTM method) is proposed. In this method, the signal preprocessing and continuous wavelet transform algorithms are used to construct time-frequency matrix, the sample entropy is used to characterize the statistical feature of CSI amplitudes, the energy difference at a fixed time interval is used to characterize the time-domain feature of activities, and the energy distribution of different frequency components is used to characterize the frequency-domain feature of activities. By expanding the training samples with the proposed tensor prediction algorithm, the accurate activity recognition can be realized with only a few samples. A large number of experiments verify the good performance of MF-ABLSTM method.<\/jats:p>","DOI":"10.1155\/2021\/5632298","type":"journal-article","created":{"date-parts":[[2021,9,15]],"date-time":"2021-09-15T21:20:57Z","timestamp":1631740857000},"page":"1-14","source":"Crossref","is-referenced-by-count":4,"title":["Small CSI Samples-Based Activity Recognition: A Deep Learning Approach Using Multidimensional Features"],"prefix":"10.1155","volume":"2021","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0664-1437","authenticated-orcid":true,"given":"Yong","family":"Tian","sequence":"first","affiliation":[{"name":"School of Physics and Electronic Technology, Liaoning Normal University, Dalian 116029, China"}]},{"given":"Sirou","family":"Li","sequence":"additional","affiliation":[{"name":"School of Physics and Electronic Technology, Liaoning Normal University, Dalian 116029, China"}]},{"given":"Chen","family":"Chen","sequence":"additional","affiliation":[{"name":"School of Physics and Electronic Technology, Liaoning Normal University, Dalian 116029, China"}]},{"given":"Qiyue","family":"Zhang","sequence":"additional","affiliation":[{"name":"School of Physics and Electronic Technology, Liaoning Normal University, Dalian 116029, China"}]},{"given":"Chuanzhen","family":"Zhuang","sequence":"additional","affiliation":[{"name":"School of Physics and Electronic Technology, Liaoning Normal University, Dalian 116029, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2536-7277","authenticated-orcid":true,"given":"Xuejun","family":"Ding","sequence":"additional","affiliation":[{"name":"School of Management Science and Engineering, Dongbei University of Finance and Economics, Dalian 116025, China"}]}],"member":"311","reference":[{"key":"1","doi-asserted-by":"publisher","DOI":"10.1007\/s11036-020-01590-8"},{"key":"2","doi-asserted-by":"publisher","DOI":"10.1016\/j.patcog.2017.10.033"},{"key":"3","doi-asserted-by":"publisher","DOI":"10.1016\/j.patcog.2016.05.019"},{"key":"4","doi-asserted-by":"publisher","DOI":"10.1109\/percom.2014.6813955"},{"key":"5","doi-asserted-by":"publisher","DOI":"10.1109\/tii.2019.2951728"},{"key":"6","doi-asserted-by":"publisher","DOI":"10.1109\/jiot.2018.2863267"},{"key":"7","doi-asserted-by":"publisher","DOI":"10.1109\/cvpr.2016.90"},{"first-page":"99","article-title":"Achieving human parity in conversational speech recognition","author":"W. 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