Research on De-noising in Optical Inter-satellites Communication
Signal Processing, 2006 8th International Conference（2007）
摘要
This paper proposes a method of wavelet analysis for de-noising at receiver system in optical inter-satellites communication. Background noises such as galactic noise, sunlight and etc make the received power reduce. The noisy signal is decomposed using wavelets and wavelet packets; then is transformed into wavelet coefficients and the lower order coefficients are removed by applying a soft threshold. De-noised signal is obtained by reconstructing with the remaining coefficients. In this paper, we evaluate different wavelet analysis for de-noising at receiver system in inter-satellites laser communication. Simulation results indicate that if the wavelet de-noising method is used with different wavelet analyzing functions, it will improves the signal to noise ratio (SNR) about 2 dB when the signal frequency is 1.0 GHz
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关键词
signal denoising,galactic noise,wavelet analysis,soft threshold,lower order coefficients,sunlight,wavelet transforms,optical inter-satellites communication,signal to noise ratio,background optical noise,wavelet coefficients,satellite communication,optical noise,de-noising,optical communication,snr,optical intersatellites communication,intersatellites laser communication,wavelet transform,wavelet packets,receiver system,laser communication
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