Critical implementation issues of excitation signals for embedded wearable bioimpedance spectroscopy systems with limited resources

被引:24
作者
Kallel, A. Y. [1 ]
Bouchaala, D. [2 ]
Kanoun, O. [1 ]
机构
[1] Tech Univ Chemnitz, Chair Measurement & Sensor Technol, Chemnitz, Germany
[2] Natl Engn Sch Sfax, Digital Res Ctr Sfax, Sfax, Tunisia
关键词
bioimpedance spectroscopy; excitation signal; spectral energy efficiency; crest factor; embedded systems; real implementation; timer; FACTOR MINIMIZATION; TIME;
D O I
10.1088/1361-6501/abf78e
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Wideband excitation signals are essential in bioimpedance spectroscopy for measurements in a time ensuring a quasi-stable measurement condition. In particular, for wearable biomedical systems, due to limited system resources, several aspects regarding measurement time, crest factor, slew rate requirements, frequency distribution, amplitude spectrum, and energy efficiency need to be thoroughly investigated. In this paper, we present an investigation of excitation signals, which includes not only the theoretical aspects but also aspects of real implementation on microcontroller-based systems. At a fixed number of samples and sampling rate, we investigate the implementability of signal frequencies and the resulting spectral efficiency. We focus on sources of signal distortion due to timer and amplitude deviations. The results show that for 4096 samples and a sampling frequency of 1 MHz, wideband signals are 2.76 times faster than a stepped frequency sweep. The multisine signal provides a better energy efficiency and has a lower slew rate requirement on hardware (around 0.3 V mu s(-1)), but has a relatively high crest factor, even after optimization. An exemplary investigation of the distortion of the time/frequency and amplitudes following implementation on a standard industrial advanced RISC machines microcontroller has shown that a sampling rate compensation is required to overcome timer inaccuracies. Furthermore, non-return-to-zero binary signals are more sensitive to distortion due to hardware-related issues and have a lower signal-to-distortion-and-noise (SINAD) ratio than 24 dB, which is lower than the multisine signal, having a SINAD of 31 dB.
引用
收藏
页数:14
相关论文
共 33 条
  • [1] Bachegowda C., 2019, OPTIMIZATION MULTISI
  • [2] High accurate and wideband current excitation for bioimpedance health monitoring systems
    Bouchaala, Dhouha
    Kanoun, Olfa
    Derbel, Nabil
    [J]. MEASUREMENT, 2016, 79 : 339 - 348
  • [3] FAST FOURIER-TRANSFORMS - A TUTORIAL REVIEW AND A STATE-OF-THE-ART
    DUHAMEL, P
    VETTERLI, M
    [J]. SIGNAL PROCESSING, 1990, 19 (04) : 259 - 299
  • [4] Dutt AG., 2020, ANN INT C IEEE ENG M
  • [5] Grimnes Sverre, 2010, Journal of Physics: Conference Series, V224, DOI 10.1088/1742-6596/224/1/012073
  • [6] CREST-FACTOR MINIMIZATION USING NONLINEAR CHEBYSHEV-APPROXIMATION METHODS
    GUILLAUME, P
    SCHOUKENS, J
    PINTELON, R
    KOLLAR, I
    [J]. IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT, 1991, 40 (06) : 982 - 989
  • [7] Gunther T., 2014, IEEE WORKSH 2014 IND, P16
  • [8] Kallel AY., 2019, 5 INT C NAN INSTR ME
  • [9] A Wrist Watch-type Cardiovascular Monitoring System using Concurrent ECG and APW Measurement
    Lee, Kwonjoon
    Song, Kiseok
    Roh, Taehwan
    Yoo, Hoi-jun
    [J]. JOURNAL OF SEMICONDUCTOR TECHNOLOGY AND SCIENCE, 2016, 16 (05) : 702 - 712
  • [10] Low-power and Compact-sized Wearable Bio-impedance Monitor with Wireless Connectivity
    Lee, Seulki
    Polito, Salvatore
    Agell, Carlos
    Mitra, Srinjoy
    Yazicioglu, Refet Firat
    Riistama, Jarno
    Habetha, Jorg
    Penders, Julien
    [J]. XV INTERNATIONAL CONFERENCE ON ELECTRICAL BIO-IMPEDANCE (ICEBI) & XIV CONFERENCE ON ELECTRICAL IMPEDANCE TOMOGRAPHY (EIT), 2013, 434