vital signs monitoring or wellness applications. Such bio-sensing nodes are typically integrated in Wireless Body Sensor Network (WBSN) to acquire and process biomedical signals, e.g. Electrocardiogram (ECG), and transmit them to the WBSN gateway, e.g. smartphone, for online reconstruction or features extraction. Both bio-sensing node and gateway are battery powered devices, although they show very different autonomy requirements (weeks vs. days). The rakeness-based Compressed Sensing (CS) proved to outperform standard CS, achieving a higher compression for the same quality level, therefore reducing the transmission costs in the node. However, most of the research focus has been on the efficiency of the node, neglecting the energy cost of the CS decoder. In this work, we evaluate the energy cost and real-time reconstruction feasibility on the gateway, considering the FOCUSS signal reconstruction algorithm running on a heterogeneous mobile SoC based on the ARM big. LITTLE TM architecture. The experimental results show that standard CS does not satisfy real-time constraints, while the rakeness enables different QoS-energy trade-offs, achieving the most efficient real-time reconstruction on the Cortex-A7 @ 1.3 GHz for 0.2 J/window (for a target QoS of 23 dB), while the lowest CPU consumption is achieved with the Cortex-A15
Energy-Aware Bio-signal Compressed Sensing Reconstruction: FOCUSS on the WBSN-Gateway
SETTI, Gianluca;
2015
Abstract
vital signs monitoring or wellness applications. Such bio-sensing nodes are typically integrated in Wireless Body Sensor Network (WBSN) to acquire and process biomedical signals, e.g. Electrocardiogram (ECG), and transmit them to the WBSN gateway, e.g. smartphone, for online reconstruction or features extraction. Both bio-sensing node and gateway are battery powered devices, although they show very different autonomy requirements (weeks vs. days). The rakeness-based Compressed Sensing (CS) proved to outperform standard CS, achieving a higher compression for the same quality level, therefore reducing the transmission costs in the node. However, most of the research focus has been on the efficiency of the node, neglecting the energy cost of the CS decoder. In this work, we evaluate the energy cost and real-time reconstruction feasibility on the gateway, considering the FOCUSS signal reconstruction algorithm running on a heterogeneous mobile SoC based on the ARM big. LITTLE TM architecture. The experimental results show that standard CS does not satisfy real-time constraints, while the rakeness enables different QoS-energy trade-offs, achieving the most efficient real-time reconstruction on the Cortex-A7 @ 1.3 GHz for 0.2 J/window (for a target QoS of 23 dB), while the lowest CPU consumption is achieved with the Cortex-A15I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
