Abstract:Objective To suppress the noise of bioradar echo signal based on multiscale time-domain filtering features of empirical mode decomposition (EMD). Methods EMD decomposition of preprocessed bioradar echo signal was conducted to obtain intrinsic mode functions (IMFs), which were divided into one mode with noise as its dominant components and the other mode with useful signal as its dominant components according to the differences of the features of noise and signal autocorrelation functions. Then the useful information of MIFs in the mode with noise as its dominant components extracted through the denoising method based on wavelet soft threshold was superimposed on MIFs in the mode with useful signal as its dominant components to obtain the life information of bioradar echo signal. Results The high-frequency noise of bioradar echo signal has been filtered and the useful information of bioradar echo signal has been extracted with the noise suppression method based on EMD. Conclusion The noise suppression method based on EMD can provide more useful information for the identify of organism objectives.
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SUN Quan, ZHANG Yang, CAO Yang, WEN Zhong-yi. Research on Noise Suppression of Bioradar Echo Signal Based on EMD. China Medical Devices, 2014, 29(8): 25-28.
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