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Suppression of Time-varying Multi-tone Interference Based on Frequency Domain Interference Detection

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Abstract

Existing active multi-tone interference (MTI) suppression methods used in direct sequence spread spectrum (DSSS) consider the interference to be time-invariant. However, in most practical scenarios, the interference is time-varying. These conventional analytic models cannot be directly applied to current realistic systems with time-varying interference. Hence, in this paper, we propose a novel approach based on frequency domain interference detection to suppress MTI experiencing a time-varying fading channel. Our approach operates in two steps. Firstly, we calculate the interference decision threshold by the probability of false alarm based on the Neyman-Pearson (NP) criterion. Secondly, we consider that the frequency bin is corrupted by interference, and the corresponding point is set to zero if the magnitude of the received signal exceeds the threshold. The simulation results demonstrate that our proposed method can mitigate time-varying MTI effectively, and can approach the interference-free performance limit over practical ranges of interference power levels and mobility levels.

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Acknowledgments

This work was supported in part by the National Natural Science Foundation of China (No. 61101034, No. 61271164, No. 61001087, No. U1035002/L05), National major projects (2011ZX03001-006-01, 2012ZX03003010-003, 2014ZX03003001-002), and the Open Research Fund of the Academy of Satellite Application.

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Correspondence to Zhanghong Hao.

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Hao, Z., Zhao, H., Shao, S. et al. Suppression of Time-varying Multi-tone Interference Based on Frequency Domain Interference Detection. Wireless Pers Commun 75, 1051–1060 (2014). https://doi.org/10.1007/s11277-013-1407-2

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  • DOI: https://doi.org/10.1007/s11277-013-1407-2

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