Master's Theses

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Browsing by Author "Abouzeid, Mohamed Osama Hussein Soliman"

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    A sub-sampling pulse-resonance OOK modulated digital ultrasound communication system for medical IOT
    (2018-04) Abouzeid, Mohamed Osama Hussein Soliman; Tekin, Ahmet; Tekin, Ahmet; Uğurdağ, Hasan Fatih; Çavuş, E.; Department of Electrical and Electronics Engineering; Abouzeid, Mohamed Osama Hussein Soliman
    This dissertation presents a new ultrasound communication microsystem (Pulsed Resonance On-Off Keying) as a viable alternative to today's widely used RF technologies in order to avoid the associated health risks. Special circuit techniques were proposed to overcome the drawbacks of classical ultrasound communications; such as echoes and excess ringing, achieving a measured communication range of 28m with a 50 bits/s data rate and BER of 0.01. Targeting mainly medical sensor devices, the technology had to be insulated, small size and low power. Utilizing a 40 kHz ultrasound transducer and an 8-pin low power controller, wireless charged, high accuracy remote temperature sensor system with nominal average current consumption of 0.5uA was designed and tested. Multiple subsystems were all merged in a total volume of 12mm diameter and 15mm height, excluding the charging coil. Each of the ultrasound communication, temperature sensor and battery measurement functions do use the same circuit pins with special circuit configurations. Thanks to echoes avoidance, ringing suppression, dynamic detection threshold adjustment techniques along with 3-bit preamble synchronization; the proposed low-power sub-sampling IQ demodulation of OOK bits resulted in high sensitivity robust ultrasound communication system without any alignment requirement for the transducers. The lifetime of the prototyped sensors with an 8mAh LiR battery was about 27 months corresponding to sensory data update frequency of 1 sample/minute.