BEGIN:VCALENDAR VERSION:2.0 PRODID:IEEE vTools.Events//EN CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:America/New_York BEGIN:DAYLIGHT DTSTART:20230312T030000 TZOFFSETFROM:-0500 TZOFFSETTO:-0400 RRULE:FREQ=YEARLY;BYDAY=2SU;BYMONTH=3 TZNAME:EDT END:DAYLIGHT BEGIN:STANDARD DTSTART:20231105T010000 TZOFFSETFROM:-0400 TZOFFSETTO:-0500 RRULE:FREQ=YEARLY;BYDAY=1SU;BYMONTH=11 TZNAME:EST END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTAMP:20230731T125042Z UID:92DFC446-951D-4EDF-BE9B-A5428865460B DTSTART;TZID=America/New_York:20230726T110000 DTEND;TZID=America/New_York:20230726T115900 DESCRIPTION:Title: Optical Wireless Communications for Low Power Internet o f Things\n\nContext: Optical wireless communication (OWC) is touted as a c omplementary technology to mitigate the scarcity issue of the RF spectrum. OWC relies on massively deployed low power consumption light emitted diod es (LED) to realise secure wireless communications in the optical domain. However\, to implement low power OWC systems for IoT applications\, it is necessary to investigate on energy efficient modulation schemes. For a typ ical OWC system\, using intensity modulation and direct detection (IM-DD)\ , the modulation signal should be unipolar and positive. Extensive researc h has been carried out on high data rate IoT applications\, which are base d on spectrally efficient linear modulation schemes\, such as pulse-amplit ude modulation (PAM)\, optical-orthogonal frequency-division multiplexing (O-OFDM)\, etc. Only very few studies have been carried on low power OWC t echnologies dedicated to low power/low data-rate IoT. To address this chal lenge\, non-linear modulations such as frequency shift keying (FSK) have r aised a substantial interest for OWC applications. As original FSK modulat ion is not compatible with the IM-DD OWC system due to its bipolar nature\ , two variants of FSK-based modulations (i.e.\, direct current (DC)-FSK an d unipolar (U)-FSK) have been introduced recently which are compatible wit h IM-DD OWC systems.\n\nAbstract: In this presentation\, a new modulation technique M-ary Asymmetrically Clipped (AC)-FSK which is compatible with I M-DD OWC systems to address the challenge of energy efficient modulation s cheme for low data-rate OWC is proposed. The spectral analysis of M-ary AC -FSK waveforms allows us to build a low complexity frequency-domain (FD) h armonic receiver which has almost the same bit error rate (BER) performanc e as the optimal receiver but with a drastic reduction of receiver complex ity. Moreover\, a new modulation approach (called AC-FPSK) is proposed for OWC systems that is based on the amalgamation of the proposed M-ary AC-FS K and phase-shift keying (PSK). AC-FPSK further improves the energy effici ency versus spectral efficiency trade-off as compared to M-ary AC-FSK. Fin ally\, an experimental demonstration\, based on the software defined radio (SDR) test bench with OWC prototype is presented for the proposed M-ary A C-FSK. Experimental results are compliant with the simulation results and highlight the interest of the proposed modulation schemes for optical wire less communications.\n\nSpeaker: Yannis Le Guennec\n\nOrganizer: IEEE Stud ent Branch Of Polytechnique Montréal\n\nThomas Micallef\, Poly-Grames Res earch Center\, Polytechnique Montréal\n\nSpeaker(s): Yannis Le Guennec\n\ nVirtual: https://events.vtools.ieee.org/m/366315 LOCATION:Virtual: https://events.vtools.ieee.org/m/366315 ORGANIZER:thomas-micallef@orange.fr SEQUENCE:16 SUMMARY:Optical Wireless Communications for Low Power Internet of Things URL;VALUE=URI:https://events.vtools.ieee.org/m/366315 X-ALT-DESC:Description: <br /><p><strong>Title:&nbsp\;</strong>Optical Wire less Communications for Low Power Internet of Things</p>\n<p><strong>Conte xt: </strong>Optical wireless communication (OWC) is touted as a complemen tary technology to mitigate the scarcity issue of the RF spectrum. OWC rel ies on massively deployed low power consumption light emitted diodes (LED) to realise secure wireless communications in the optical domain. However\ , to implement low power OWC systems for IoT applications\, it is necessar y to investigate on energy efficient modulation schemes. For a typical OWC system\, using intensity modulation and direct detection (IM-DD)\, the mo dulation signal should be unipolar and positive. Extensive research has be en carried out on high data rate IoT applications\, which are based on spe ctrally efficient linear modulation schemes\, such as pulse-amplitude modu lation (PAM)\, optical-orthogonal frequency-division multiplexing (O-OFDM) \, etc. Only very few studies have been carried on low power OWC technolog ies dedicated to low power/low data-rate IoT. To address this challenge\, non-linear modulations such as frequency shift keying (FSK) have raised a substantial interest for OWC applications. As original FSK modulation is n ot compatible with the IM-DD OWC system due to its bipolar nature\, two va riants of FSK-based modulations (i.e.\, direct current (DC)-FSK and unipol ar (U)-FSK) have been introduced recently which are compatible with IM-DD OWC systems.</p>\n<p><strong>Abstract: </strong>In this presentation\, a n ew modulation technique M-ary Asymmetrically Clipped (AC)-FSK which is com patible with IM-DD OWC systems to address the challenge of energy efficien t modulation scheme for low data-rate OWC is proposed. The spectral analys is of M-ary AC-FSK waveforms allows us to build a low complexity frequency -domain (FD) harmonic receiver which has almost the same bit error rate (B ER) performance as the optimal receiver but with a drastic reduction of re ceiver complexity. Moreover\, a new modulation approach (called AC-FPSK) i s proposed for OWC systems that is based on the amalgamation of the propos ed M-ary AC-FSK and phase-shift keying (PSK). AC-FPSK further improves the energy efficiency versus spectral efficiency trade-off as compared to M-a ry AC-FSK. Finally\, an experimental demonstration\, based on the software defined radio (SDR) test bench with OWC prototype is presented for the pr oposed M-ary AC-FSK. Experimental results are compliant with the simulatio n results and highlight the interest of the proposed modulation schemes fo r optical wireless communications.</p>\n<p><strong>Speaker: </strong>Yanni s Le Guennec</p>\n<p><strong>Organizer:</strong> IEEE Student Branch Of Po lytechnique Montr&eacute\;al</p>\n<p>Thomas Micallef\, Poly-Grames Researc h Center\, Polytechnique Montr&eacute\;al</p> END:VEVENT END:VCALENDAR