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A Two-Stage Reconstruction Processor for Human Detection in Compressive Sensing CMOS Radar

1
Department of Electrical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan
2
Institute of Communications Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan
*
Author to whom correspondence should be addressed.
Sensors 2018, 18(4), 1106; https://doi.org/10.3390/s18041106
Received: 28 February 2018 / Revised: 2 April 2018 / Accepted: 3 April 2018 / Published: 5 April 2018
(This article belongs to the Special Issue Sensor Signal and Information Processing)
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Abstract

Complementary metal-oxide-semiconductor (CMOS) radar has recently gained much research attraction because small and low-power CMOS devices are very suitable for deploying sensing nodes in a low-power wireless sensing system. This study focuses on the signal processing of a wireless CMOS impulse radar system that can detect humans and objects in the home-care internet-of-things sensing system. The challenges of low-power CMOS radar systems are the weakness of human signals and the high computational complexity of the target detection algorithm. The compressive sensing-based detection algorithm can relax the computational costs by avoiding the utilization of matched filters and reducing the analog-to-digital converter bandwidth requirement. The orthogonal matching pursuit (OMP) is one of the popular signal reconstruction algorithms for compressive sensing radar; however, the complexity is still very high because the high resolution of human respiration leads to high-dimension signal reconstruction. Thus, this paper proposes a two-stage reconstruction algorithm for compressive sensing radar. The proposed algorithm not only has lower complexity than the OMP algorithm by 75% but also achieves better positioning performance than the OMP algorithm especially in noisy environments. This study also designed and implemented the algorithm by using Vertex-7 FPGA chip (Xilinx, San Jose, CA, USA). The proposed reconstruction processor can support the 256 × 13 real-time radar image display with a throughput of 28.2 frames per second. View Full-Text
Keywords: compressive sensing; CMOS radar; ranging compressive sensing; CMOS radar; ranging
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Tsao, K.-C.; Lee, L.; Chu, T.-S.; Huang, Y.-H. A Two-Stage Reconstruction Processor for Human Detection in Compressive Sensing CMOS Radar. Sensors 2018, 18, 1106.

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