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Wavelet Notch Filter Design of Spread-Spectrum Communication Systems for High-Precision Wireless Positioning

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Abstract

Spread-spectrum communication systems are now commonly used in the field of cellular telephone positioning. However, wireless positioning systems by low-power spread-spectrum communication are extremely vulnerable to high-power interference, which limits achievable measurement precision. In this paper, a bandwidth variable wavelet notch filter design method is proposed to suppress a large number of jammers in multiple locations with noise interfering with spread-spectrum systems. The filter uses combinations of Gaussian wavelets with optimal time-frequency localization and computational efficiency for real-time operation of denoising. The performance of the adaptive filter has been evaluated by experiments associated with a spread-spectrum communication system model employing a reliable noise detector to locate the filter notch. Experimental results demonstrate that the proposed wavelet notch filter removes the narrow-band interference in accordance with the corrupted frequency contents while minimizing signal distortion and information loss, which leads to high-precision wireless positioning.

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Correspondence to Gaoyong Luo.

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Luo, G. Wavelet Notch Filter Design of Spread-Spectrum Communication Systems for High-Precision Wireless Positioning. Circuits Syst Signal Process 31, 651–668 (2012). https://doi.org/10.1007/s00034-011-9335-4

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  • DOI: https://doi.org/10.1007/s00034-011-9335-4

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