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A Low-Power OFDM-Based Wake-Up Mechanism for IoE Applications | IEEE Journals & Magazine | IEEE Xplore

A Low-Power OFDM-Based Wake-Up Mechanism for IoE Applications

Publisher: IEEE

Abstract:

This brief presents a wake-up mechanism for orthogonal frequency division multiplexing (OFDM) modulation-based systems by coding a low data-rate wake-up signal in transmi...View more

Abstract:

This brief presents a wake-up mechanism for orthogonal frequency division multiplexing (OFDM) modulation-based systems by coding a low data-rate wake-up signal in transmitter without extra circuitry overhead. It is achieved by controlling data pattern for each OFDM subcarrier in one symbol of frame to produce an equivalent amplitude-modulated (AM) signal as a wake-up query without contaminating protocol integrity. A low-power wake-up receiver is used to demodulate this signal and interpret the wake-up query. A system using proposed wake-up mechanism has been built based on IEEE 802.11ah standard. Measurement results demonstrate that an AM-type wake-up signal with a data-rate of 31.25 Kb/s is generated through the proposed method. Moreover, an envelope detector with -35-dBm sensitivity at 900 MHz has been implemented in 0.13-μm CMOS technology for wake-up signal detection and consumes 120-nW power.
Published in: IEEE Transactions on Circuits and Systems II: Express Briefs ( Volume: 65, Issue: 2, February 2018)
Page(s): 181 - 185
Date of Publication: 06 March 2017

ISSN Information:

Publisher: IEEE

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