May 2005 doc.: IEEE 15-05-0316-00-004a Project: IEEE P802.15 Working Group for Wireless Personal Area Networks ( etworks (WPANs WPANs) ) Project: IEEE P802.15 Working Group for Wireless Personal Area N Submission Title: Wake-up Radio Presentation for IEEE TG4a PHY Date Submitted: May 2005 Source: (1) Young-Hwan Kim, Jae-Hyon Kim, Seong-Soo Lee (2) Haksun Kim, Tahjoon Park, Eungju Kim, Changsoo Yang, Kyeongli Kim, Kwangdu Kim Company: (1) Samsung Electronics Co., Ltd. (Samsung Advanced Institute of Technology (SAIT)) (2) Samsung Electro-Mechanics Co., Ltd. (SEM) Address: (1) San 14-1, Nongseo-ri, Giheung-eup, Yongin-si, Gyeonggi-do, Korea 449-712 (2) 314, Maetan-3Dong, Youngtong-Gu, Suwon, Gyeonggi-Do, Korea 443-743 Voice: [+82-31-280-9663], FAX: [+82-31-280-9555], E-Mail: [ jae.kim@samsung.com] Re: [Response to IEEE 802.15.4a Call for Proposals (04/380r2)] Abstract: [Proposal for the IEEE 802.15.4a PHY standard based on wake-up radio system technology.] Purpose: [Proposal for the IEEE 802.15.4a PHY standard.] Notice: This document has been prepared to assist the IEEE P802.15. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.15. Submission Slide 1 SAIT/SEM
May 2005 doc.: Wake-up Radio Presentation for IEEE 802.15.4a PHY Presented by: Jae-Hyon Kim Samsung Advanced Institute of Technology (SAIT) Samsung Electro-Mechanics (SEM) Submission Slide 2 SAIT/SEM
May 2005 doc.: IEEE 15-05-0316-00-004a Objective • Propose inclusion of wake-up radio to provide ability of controlling wake-up and to reduce power consumption – Ultra-low Power Receiver Requirements Power Consumption (TG4a Technical Requirement) -The device (complete communication system including alt-PHY and MAC) must operate while supporting a battery life of months or years without intervention. -Therefore very efficient power saving modes are desirable, in particular for devices that transmit sporadically. In addition the coordination of nodes must not induce frequent wake up of nodes. These mechanisms must be supported by the alt-PHY layer. Power Management Modes (TG4a Selection Criteria) -The ability to reduce power consumption for devices compliant with this standard is important. -Definition: Power management modes and protocols allow device sleep, wakeup, and poll. The IEEE 802.15.4 standard provides such power management capabilities. Submission Slide 3 SAIT/SEM
May 2005 doc.: IEEE 15-05-0316-00-004a Wake-up: Procedure All zeros to bypass or a code to wake up Transmitter Preamble ID Preamble ID Data #1 Receiver Carrier Carrier discarded Sensing Sensing ID Sensing Wake-up Carrier Carrier #2 Receiver Receive Data Sensing Sensing ID Sensing #N Receiver Carrier Carrier discarded Sensing Sensing ID Sensing Submission Slide 4 SAIT/SEM
May 2005 doc.: IEEE 15-05-0316-00-004a Wake-up: ID To provide wake-up ability it requires to include wake-up ID in the header 802.15.4 PPDU Preamble SFD PHR PSDU 4 + 1 + 1 Bytes 32 Bytes Proposed PPDU WU-ID Preamble SFD PHR PSDU 0 ~ 127Bytes 4 + 2 + 1 + 1 Bytes WU-ID: Wake-up ID WU-ID can be all 0 sequence (to bypass) or a code (to wake-up) Submission Slide 5 SAIT/SEM
May 2005 doc.: IEEE 15-05-0316-00-004a Wake-up: Radio Structure Power Carrier Signal Detector Wake Up Signal Super-regenerative OSC Detector Carrier Sensing Signal High Gain Switch LNA Correlator Detector Amplifier Wake-up Signal Detector Wake-up Signal Main Transceiver • Wake-up radio detects broadcast wake-up carrier signal and activates wake-up signal detector for wake-up signal detection • Conserves power by only turning on wake-up signal detector when it is needed; carrier detector consumes little power on its own compared to wake-up signal detector Submission Slide 6 SAIT/SEM
May 2005 doc.: IEEE 15-05-0316-00-004a Wake-up: Signal Flow of Radio Signal Carrier Signal Detector ON Carrier Signal ? No YES Wake-up Signal Detector ON & Carrier Signal Detector OFF Wake-up Signal ? No YES Main Data Radio ON Wake-up Signal Detector OFF Data Communication Submission Slide 7 SAIT/SEM
May 2005 doc.: Back-up Slide Submission Slide 8 SAIT/SEM
May 2005 doc.: IEEE 15-05-0316-00-004a Wake-up: Carrier Signal Detector Quench Low-Pass Envelope Wake-up Signal Σ RF IN Comparator A Detector Filter Detector ON β Super-regenerative OSC Super-regenerative OSC • Possible low power operation - Allows Possible radio operation above device f T - Allows low bias current levels • Minimal number of active devices - A very simple architecture • Very good sensitivity – Due to High RF gain – Allows reduction in transmit power • Super-regenerative receiver has essentially infinite gain and high output level. • The principle of super-regeneration allows a very simple architecture and appears to be particularly suited to micro-power applications, compared to the super-heterodyne, the low IF or the direct conversion receiver. Submission Slide 9 SAIT/SEM
May 2005 doc.: IEEE 15-05-0316-00-004a Wake-up: Signal Detector RF IN Low Pass Identification Correlator High Gain Envelope LNA Filter Detector (Matched Filter) Amplifier Detector Wake-up Signal Tc • Simple architecture and low power operation – Does not require many high-frequency active components such as Mixer, PLL, OSC. • The signal is reinforced by the correlator (matched filter) while the disturbances contribute only as basic noise (system gain). Therefore, wake-up signal detector is very resistant against narrowband noise and interferer. Submission Slide 10 SAIT/SEM
May 2005 doc.: IEEE 15-05-0316-00-004a Wake-up: Characteristics of Signal Data 1 0 1 1 0 OOK 1 0 111 0 1 … Barker Code/BPSK Transmitter Demodulated wake-up signal • The signal is modulated by OOK. - It has less complexity. • Each symbol is modulated by Correlator BPSK and is coded by barker (Matched Filter) code. - It has very resistance against narrowband noise and interferer. Submission Slide 11 SAIT/SEM
Chaotic Source ( 1 ) May 2005 doc.: IEEE 15-05-0316-00-004a • Colpitts Oscillator a1 vo R R R20 chotic_Filter2 L21 R=50 X 11 R=200 Ohm V_DC SRC6 Top Bottom R Vdc=Vc R23 Shield spiral_s2_std_TT X 6 mimcap_shield_TT X 7 BPF ( Off Chip) R R22 mimcap_shield_TT nmos_rf_TT Top X 9 TT mimcap_shield_TT Top Shield Bottom X 10 R R21 Bottom Shield CMOS I C ( On Chip) � TSMC 0 .1 8 um CMOS Process � Pow er Consum ption:1 .8 m W ( 1 m A, 1 .8 V) Submission Slide 12 SAIT/SEM
Chaotic Source ( 2 ) May 2005 doc.: IEEE 15-05-0316-00-004a • Simulation Results 600 -60 -80 400 -100 200 dBm(fs(vo)) vo, uV -120 0 -140 -200 -160 -400 -180 -600 -200 100 200 300 400 500 600 0 5 10 15 20 25 30 time, nsec freq, GHz 1.4 .State trajectory 1.2 Drain_V 1.0 0.8 0.6 0.4 0.14 0.16 0.18 0.20 0.22 0.24 0.26 0.28 Source_v Submission Slide 13 SAIT/SEM
Layout of Chaotic Source May 2005 doc.: IEEE 15-05-0316-00-004a • Colpitts Oscillator 4 0 0 um 3 0 0 um Submission Slide 14 SAIT/SEM
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