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With the increasing use of wireless capsule endoscopy (WCE) devices in healthcare, it is of utmost importance to analyze the electromagnetic power absorption and thermal effects caused by in-body propagation of wireless signals from these devices. This paper studies the path loss, specific absorption rate (SAR), specific absorption (SA), and temperature(More)
Blood pressure monitoring based on pulse transit or arrival time has been the focus of much research in order to design ambulatory blood pressure monitors. The accuracy of these monitors is limited by several challenges, such as acquisition and processing of physiological signals as well as changes in vascular tone and the pre-ejection period. In this work,(More)
Wireless capsule endoscopy (WCE) presents many advantages over traditional wired endoscopic methods. The performance of WCE devices can be improved using high-frequency communication systems such as Impulse Radio-Ultra-Wideband (IR-UWB) to enable a high data rate transmission with low-power consumption. This paper presents the hardware implementation and(More)
OBJECTIVE We have developed and tested a new architecture for pulse transit time (PTT) estimation at the central arteries using electrical bioimpedance, electrocardiogram, and continuous wave radar to estimate cuffless blood pressure. METHODS A transmitter and receiver antenna are placed at the sternum to acquire the arterial pulsation at the aortic arch.(More)
Ultra-wide band (UWB) is gaining popularity as a physical layer technique for low power and high data rate wireless applications. Currently most wireless body area network (WBAN) platforms are based on narrowband wireless technology such as ZigBee and Bluetooth. This paper presents hardware implementation of impulse radio ultra-wide band (IR-UWB) based(More)
Two high-resolution passive delay line phase shifters in silicon-on-sapphire are compared. Both make use of digitally tuned capacitor loaded &#x03C0; sections to obtain 360 <sup>&#x00B0;</sup> phase control. The first has a nominal resolution of 9-bit and uses ten sections, yielding an insertion loss (IL) of 12.6 dB at 1.4 GHz. The second employs a center(More)
Biomedical implanted systems require wireless technology to transfer data and power to the implanted devices. This paper compares the performance and suitability of the ASK, FSK, PSK, OOK and PWM-ASK modulation schemes in implantable devices. Simulations illustrate that the best scenario for power and data transmission is obtained using PWM coded ASK(More)