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Sensors 2017, 17(10), 2233; https://doi.org/10.3390/s17102233

A Nonlinearity Mitigation Method for a Broadband RF Front-End in a Sensor Based on Best Delay Searching

1
School of Electronic Information and Communications, Huazhong University of Science & Technology, 1037 Luoyu Road, Wuhan 430074, China
2
Hubei Province Radio Monitoring Station, 15 Fayuan Road,Wuhan 430061, China
*
Author to whom correspondence should be addressed.
Received: 22 July 2017 / Revised: 7 September 2017 / Accepted: 14 September 2017 / Published: 28 September 2017
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Abstract

The cognitive radio wireless sensor network (CR-WSN) is experiencing more and more attention for its capacity to automatically extract broadband instantaneous radio environment information. Obtaining sufficient linearity and spurious-free dynamic range (SFDR) is a significant premise of guaranteeing sensing performance which, however, usually suffers from the nonlinear distortion coming from the broadband radio frequency (RF) front-end in the sensor node. Moreover, unlike other existing methods, the joint effect of non-constant group delay distortion and nonlinear distortion is discussed, and its corresponding solution is provided in this paper. After that, the nonlinearity mitigation architecture based on best delay searching is proposed. Finally, verification experiments, both on simulation signals and signals from real-world measurement, are conducted and discussed. The achieved results demonstrate that with best delay searching, nonlinear distortion can be alleviated significantly and, in this way, spectrum sensing performance is more reliable and accurate. View Full-Text
Keywords: broadband RF front-end; nonlinear distortion; non-constant group delay distortion; nonlinearity mitigation; cognitive radio wireless sensor network broadband RF front-end; nonlinear distortion; non-constant group delay distortion; nonlinearity mitigation; cognitive radio wireless sensor network
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Zhao, W.; Ma, H.; Zhang, H.; Jin, J.; Dai, G.; Hu, L. A Nonlinearity Mitigation Method for a Broadband RF Front-End in a Sensor Based on Best Delay Searching. Sensors 2017, 17, 2233.

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