Department of Electrical Engineering, National Taiwan University of Science and Technology EURASIP Journal on Wireless Communications and Networking

 Introduction  Related work  High Sensitivity wake-up radio  Performance evaluation  Discussions  QwikRadio

 Energy efficiency in sensor network ◦ MAC protocol ◦ Wake-up radio  Design of a high sensitivity wake-up radio circuit

 Passive wake-up radio ◦ Charge pump ◦ RFID  Active wake-up radio ◦ Filters, amplifiers, modulation methodologies ◦ Data rate, sensitivity ◦ Additional radio parts

 Wake-up radio prototype is separate from the sensor node with a main data receiver  Fleck3b + QwikRadio

 Empirical evaluation ◦ MHz ◦ Spreading code scheme and OOK  Simulation

 High sensitivity wake-up radio ◦ Active component ◦ Spreading code correlation algorithm  Sensitivity : -122 dBm ◦ 16 chips/symbol, OS rate of 4, SNR -4dB ◦ Radio range : 1km in free space

 RF receiver Under 1GHz  OOK modulator / demodulator