Abstract
This paper focuses on the high resolution time-frequency distribution (TFD) of multicomponent signals with amplitude and frequency modulations, and a concise method named short-time sparse representation (STSR) is proposed. In STSR, both analysis and synthesis of the discrete signal can be achieved by exploiting the signal’s sparsity in frequency domain at each time instant. In order to fasten the STSR procedure, an efficient sparse recovery algorithm named SL0 is applied, and the signal model for each sliding window is modified to form the same dictionary, which guarantees that the whole recovery procedure adapts to the matrix form. The performance of STSR is compared with other TFD techniques and assessed in various configurations. It is shown that both preferable representation and acceptable computational cost can be obtained.
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This work is supported by the Natural Science Foundation of China (NSFC, No. 61171133 and No. 61271442) and the innovation project for excellent postgraduates of National University of Defense Technology under Grant B110404.
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Liu, Z., You, P., Wei, X. et al. High Resolution Time-Frequency Distribution Based on Short-Time Sparse Representation. Circuits Syst Signal Process 33, 3949–3965 (2014). https://doi.org/10.1007/s00034-014-9832-3
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DOI: https://doi.org/10.1007/s00034-014-9832-3