Delta-Sigma Encoder for Low-Power Wireless Bio-Sensors Using Ultrawideband Impulse Radio
Delta-Sigma Encoder for Low-Power Wireless Bio-Sensors Using Ultrawideband Impulse Radio
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DOI：
10.1109/tcsii.2016.2601062
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发表时间：
2017-07-01
影响因子：
4.4
通讯作者：
Tang, Wei
中科院分区：
文献类型：
--
作者：
Tang, Xiaochen;Hu, Qisong;Tang, Wei
本简介提出了一种降低用于感测生物医学信号的无线传感器节点的功耗的系统方法。该设计结合了 delta-sigma 调制器 (DSM)、超宽带脉冲无线电 (UWB-IR) 以及所提出的基于 XNOR 延迟的编码器/解码器（取代了抽取滤波器）。给出了一阶和二阶 DSM 的编码器和解码器。通过使用异步UWB-IR 解决了时钟同步问题。通过使用神经和心电图信号进行仿真，研究了窗口长度、Δ-Σ 调制阶数和过采样率的影响。根据仿真结果，与具有抽取滤波器的系统相比，所提出的方法可以节省 50% 的功耗，与没有所提出的编码器的系统相比，可以节省 53% 的功耗。
This brief presents a systematic method to reduce the power consumption of a wireless sensor node for sensing biomedical signals. The design combines the delta-sigma modulator (DSM), the ultrawideband impulse radio (UWB-IR), and the proposed XNOR-delay-based encoder/decoder, which replaces the decimation filter. The encoder and decoder for both the first- and second-order DSMs are presented. The clock synchronization problem is solved by using an asynchronous UWB-IR. The effects of window length, the order of delta-sigma modulation, and the oversampling ratio are studied by simulation using neural and electrocardiography signals. Based on the simulation results, the proposed method can save power by 50% compared to the system with decimation filters, and 53% compared to the system without the proposed encoder.