A Two-Stage Reconstruction Processor for Human Detection in Compressive Sensing CMOS Radar
AbstractComplementary 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
Share & Cite This Article
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.
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(4):1106.Chicago/Turabian Style
Tsao, Kuei-Chi; Lee, Ling; Chu, Ta-Shun; Huang, Yuan-Hao. 2018. "A Two-Stage Reconstruction Processor for Human Detection in Compressive Sensing CMOS Radar." Sensors 18, no. 4: 1106.
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.