BEGIN:VCALENDAR VERSION:2.0 PRODID:IEEE vTools.Events//EN CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:America/New_York BEGIN:DAYLIGHT DTSTART:20260308T030000 TZOFFSETFROM:-0500 TZOFFSETTO:-0400 RRULE:FREQ=YEARLY;BYDAY=2SU;BYMONTH=3 TZNAME:EDT END:DAYLIGHT BEGIN:STANDARD DTSTART:20261101T010000 TZOFFSETFROM:-0400 TZOFFSETTO:-0500 RRULE:FREQ=YEARLY;BYDAY=1SU;BYMONTH=11 TZNAME:EST END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTAMP:20260820T110042Z UID:9DBA5C65-4358-46F6-9132-008C97777F60 DTSTART;TZID=America/New_York:20260827T180000 DTEND;TZID=America/New_York:20260827T193000 DESCRIPTION:Abstract :\n\nFuture 6G wireless communication systems will req uire high spectral and energy efficiencies for both economic and environme ntal reasons. Current amplifiers can have very low amplification efficienc y\, especially when used with variable-envelope broadband signals like the OFDM-based schemes and single-carrier schemes with compact spectrum (both widely employed in broadband wireless land and satellite communications). In fact\, the maximum amplification efficiency for quasi-linear amplifier s (like class-A amplifiers) is 50%. This value drops to 5-10% when high-PA PR signals are employed. By using strongly nonlinear\, switched amplifiers (like class D or F amplifiers)\, we can increase the maximum theoretical amplification to 100%\, but the strong nonlinear distortion levels preclud e its use with variable-envelope signals.\n\nIn this presentation\, we mak e an overview on block transmission techniques for broadband wireless comm unications\, as well as current power amplification schemes\, with their a dvantages and limitations when employed with variable-envelope signals. We also present an innovative and highly disruptive amplification scheme nam ed quantized digital amplification (QDA)\, which can overcome those limita tions. It is shown that the QDA allows a quasi-linear amplification of var iable-envelope signals like OFDM ones\, while maintaining very high energy efficiency\, being able to fulfill the spectral masks and EVM (Error Vect or Magnitude) requirements of the most demanding wireless systems\, includ ing OFDM-based MIMO systems employing large QAM constellations. The power efficiency gains of the QDA allow significant improvements in bit rates an d coverage for wireless systems in general\n\nSpeaker(s): Dr. Rui Dinis\, \n\nRoom: EV005-251\, Bldg: Electrical & Computer Engineering Department E V\, Concordia University\, 1515 Ste. Catherine West\, MONTREAL\, Quebec\, Canada\, H3G 1M8 LOCATION:Room: EV005-251\, Bldg: Electrical & Computer Engineering Departme nt EV\, Concordia University\, 1515 Ste. Catherine West\, MONTREAL\, Quebe c\, Canada\, H3G 1M8 ORGANIZER:anader.benyamin@ieee.org SEQUENCE:1 SUMMARY:Achieving High Power Efficiency with Variable Envelope Signals URL;VALUE=URI:https://events.vtools.ieee.org/m/571130 X-ALT-DESC:Description: <br /><p class="Default" style="margin-bottom: 1.0p t\;"><strong><u><span lang="EN-US" style="font-size: 11.0pt\; color: navy\ ;">Abstract :</span></u></strong></p>\n<p class="MsoNormal" style="text-al ign: justify\; line-height: 115%\; mso-pagination: none\; mso-layout-grid- align: none\; text-autospace: none\; margin: .7pt 4.35pt .0001pt 0cm\;"><s pan style="font-family: 'Arial'\,sans-serif\; color: black\;">&nbsp\;</spa n></p>\n<p class="MsoNormal" style="text-align: justify\;"><span style="fo nt-size: 11.0pt\; font-family: 'Arial'\,sans-serif\; color: black\;">Futur e 6G wireless communication systems will require high spectral and energy efficiencies for both economic and environmental reasons. Current amplifie rs can have very low amplification efficiency\, especially when used with variable-envelope broadband signals like the OFDM-based schemes and single -carrier schemes with compact spectrum (both widely employed in broadband wireless land and satellite communications). In fact\, the maximum amplifi cation efficiency for quasi-linear amplifiers (like class-A amplifiers) is 50%. This value drops to 5-10% when high-PAPR signals are employed. By us ing strongly nonlinear\, switched amplifiers (like class D or F amplifiers )\, we can increase the maximum theoretical amplification to 100%\, but th e strong nonlinear distortion levels preclude its use with variable-envelo pe signals.</span></p>\n<p><span style="font-size: 11.0pt\; font-family: ' Arial'\,sans-serif\; mso-fareast-font-family: 'Times New Roman'\; color: b lack\; mso-ansi-language: EN-CA\; mso-fareast-language: EN-US\; mso-bidi-l anguage: AR-SA\;">In this presentation\, we make an overview on block tran smission techniques for broadband wireless communications\, as well as cur rent power amplification schemes\, with their advantages and limitations w hen employed with variable-envelope signals. We also present an innovative and highly disruptive amplification scheme named quantized digital amplif ication (QDA)\, which can overcome those limitations. It is shown that the QDA allows a quasi-linear amplification of variable-envelope signals like OFDM ones\, while maintaining very high energy efficiency\, being able to fulfill the spectral masks and EVM (Error Vector Magnitude) requirements of the most demanding wireless systems\, including OFDM-based MIMO systems employing large QAM constellations. The power efficiency gains of the QDA allow significant improvements in bit rates and coverage for wireless sys tems in general</span></p> END:VEVENT END:VCALENDAR