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This paper presents a fully integrated wireless sensor brain machine interface system to restore continuous somatosensory feedback from the hand. A wireless bi-directional neural interface system-on-chip (SoC) and a wireless sensor node design are described in this work. The neural interface integrates a 16-channel neural recording front-end, a 16-channel electrical stimulation back-end, a successive...
The sense of touch and proprioception are critical to movement control. After spinal cord injury, these senses may be restored with direct, electrical microstimulation of the brain as part of a complete sensorimotor neuroprosthesis. The present study was designed to test, in part, the hypothesis that the cuneate nucleus (CN) of the brainstem is a suitable site to encode somatosensory information....
This paper presents a 12-channel, low-power, high efficiency neural signal acquisition front-end for local field potential and action potential signals recording. The proposed neural front-end integrates low noise instrumentation amplifiers, low-power filter stages with configurable gain and cut-off frequencies, a successive approximation register (SAR) ADC, and a realtime compressed sensing processing...
In this paper, a wireless electrogoniometer is described using a pair of ultra-wide band (UWB) wireless smart sensor nodes that are interfaced to low power 3-axis accelerometers. A high resolution SAR ADC as well as a low power asynchronous continuous sampling event-driven ADC are integrated for the digitization of the input signal under different operation modes. An anti-self-locking circuit is included...
Intra-body communication (IBC) has gone through explosively growth in both human body channel characterization as well as circuits and systems implementation in recent years. However, up to now, the physical layer security issues of the IBC has never been carefully studied. This is the first paper analyzing the physical layer security issues of electric-field IBC (EF-IBC). The EF-IBC channel gain...
The electric-field (EF) intra-body communication (IBC) is a promising data transmission method for high-speed low-power biomedical sensors. A good model of the EF-IBC channel is needed for better understanding the signal propagation principle and more efficient IBC transceiver design. Although various effective models have been developed for the waveguide IBC channel, the EF-IBC channel has only been...
Intra-body communication (IBC) uses the conductive human body as the communication channel for data exchange. As the bio-sensor research is moving towards portable, wearable and implantable designs, IBC has significant potential applications for personal health care. Previous IBC research mainly focused on the electromagnetic (EM) IBC scheme, which resulted in low data rate (kbps). In this paper,...
In this work, the experiment setup of EF-IBC is studied. An effective setup is developed to preserve the parasitic return path in EF-IBC. Characteristics of every component in an EF-IBC system are measured or derived through a combination of experiments. The measured EF-IBC channel shows a bandpass profile with a center frequency around 42 MHz. The channel bandpass profile is mainly determined by...
Fountain codes is a class of forward correcting codes (FEC) very suitable for applications like content dissemination and reliable multicasting in erasure channels. However, the code-length of the traditional fountain codes is quite large that holds back the data fountain scheme from efficiently supporting real-time services and resource restricted applications. This paper focuses on the designing...
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