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Application and improvement of wavelet packet de-noising in satellite transponder
Pages: 671-679
Year: Issue:  4
Journal: Journal of Systems Engineering and Electronics

Keyword:  wavelet packet de-noising (WPD)satel ite transpon-derpower consumption reductionreal-time de-noising;
Abstract: The satel ite transponder is a widely used module in satel ite missions, and the most concerned issue is to reduce the noise of the transferred signal. Otherwise, the telemetry signal wil be pol uted by the noise contained in the transferred signal, and the additional power wil be consumed. Therefore, a method based on wavelet packet de-noising (WPD) is introduced. Compared with other techniques, there are two features making WPD more suit-able to be applied to satel ite transponders: one is the capability to deal with time-varying signals without any priori information of the input signals; the other is the capability to reduce the noise in band, even if the noise overlaps with signals in the frequency domain, which provides a great de-noising performance especial y for wideband signals. Besides, an oscil ation detector and an av-eraging filter are added to decrease the partial oscil ation caused by the thresholding process of WPD. Simulation results show that the proposed algorithm can reduce more noises and make less distortions of the signals than other techniques. In addition, up to 12 dB additional power consumption can be reduced at –10 dB signal-to-noise ratio (SNR).
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