BEGIN:VCALENDAR VERSION:2.0 PRODID:IEEE vTools.Events//EN CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:America/Los_Angeles BEGIN:DAYLIGHT DTSTART:20260308T030000 TZOFFSETFROM:-0800 TZOFFSETTO:-0700 RRULE:FREQ=YEARLY;BYDAY=2SU;BYMONTH=3 TZNAME:PDT END:DAYLIGHT BEGIN:STANDARD DTSTART:20261101T010000 TZOFFSETFROM:-0700 TZOFFSETTO:-0800 RRULE:FREQ=YEARLY;BYDAY=1SU;BYMONTH=11 TZNAME:PST END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTAMP:20260331T213013Z UID:6FD6ABEB-6C88-45E8-B729-62092B3ED761 DTSTART;TZID=America/Los_Angeles:20260424T111500 DTEND;TZID=America/Los_Angeles:20260424T123000 DESCRIPTION:Abstract: Future 6G wireless communication systems will require high spectral and energy efficiencies for both economic and environmental reasons. Current amplifiers can have very low amplification efficiency\, especially when used with variable-envelope broadband signals like the OFD M-based schemes and single-carrier schemes with compact spectrum (both wid ely employed in broadband wireless land and satellite communications). In fact\, the maximum amplification efficiency for quasi-linear amplifiers (l ike class-A amplifiers) is 50%. This value drops to 5-10% when high-PAPR s ignals are employed. By using strongly nonlinear\, switched amplifiers (li ke class D or F amplifiers)\, we can increase the maximum theoretical ampl ification to 100%\, but the strong nonlinear distortion levels preclude it s use with variable-envelope signals.\nIn this presentation\, we make an o verview on block transmission techniques for broadband wireless communicat ions\, as well as current power amplification schemes\, with their advanta ges and limitations when employed with variable-envelope signals. We also present an innovative and highly disruptive amplification scheme named qua ntized digital amplification (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 effic iency\, being able to fulfill the spectral masks and EVM (Error Vector Mag nitude) requirements of the most demanding wireless systems\, including OF DM-based MIMO systems employing large QAM constellations. The power effici ency gains of the QDA allow significant improvements in bit rates and cove rage for wireless systems in general.\n\nRoom: MCLD 3038\, Bldg: Hector J. MacLeod Building - MCLD\, 2356 Main Mall\, Vancouver\, BC V6T 1Z4\, Vanco uver\, British Columbia\, Canada\, Virtual: https://events.vtools.ieee.org /m/551233 LOCATION:Room: MCLD 3038\, Bldg: Hector J. MacLeod Building - MCLD\, 2356 M ain Mall\, Vancouver\, BC V6T 1Z4\, Vancouver\, British Columbia\, Canada\ , Virtual: https://events.vtools.ieee.org/m/551233 ORGANIZER:benjamin.crockett@ieee.org SEQUENCE:27 SUMMARY:Distinguished Lecturer Tour: Achieving High Power Efficiency with V ariable Envelope Signals URL;VALUE=URI:https://events.vtools.ieee.org/m/551233 X-ALT-DESC:Description: <br /><p><img src="https://events.vtools.ieee.org/v tools_ui/media/display/81cc6835-18f3-4677-947c-0d3081f282aa" width="1086" height="670"></p>\n<p><strong>Abstract:&nbsp\;</strong>Future 6G wireless communication systems will require high spectral and energy efficiencies f or both economic and environmental reasons. Current amplifiers can have ve ry low amplification efficiency\, especially when used with variable-envel ope broadband signals like the OFDM-based schemes and single-carrier schem es with compact spectrum (both widely employed in broadband wireless land and satellite communications). In fact\, the maximum amplification efficie ncy for quasi-linear amplifiers (like class-A amplifiers) is 50%. This val ue drops to 5-10% when high-PAPR signals are employed. By using strongly n onlinear\, switched amplifiers (like class D or F amplifiers)\, we can inc rease the maximum theoretical amplification to 100%\, but the strong nonli near distortion levels preclude its use with variable-envelope signals.<br >In this presentation\, we make an overview on block transmission techniqu es for broadband wireless communications\, as well as current power amplif ication schemes\, with their advantages and limitations when employed with variable-envelope signals. We also present an innovative and highly disru ptive amplification scheme named quantized digital amplification (QDA)\, w hich can overcome those limitations. It is shown that the QDA allows a qua si-linear amplification of variable-envelope signals like OFDM ones\, whil e maintaining very high energy efficiency\, being able to fulfill the spec tral masks and EVM (Error Vector Magnitude) requirements of the most deman ding wireless systems\, including OFDM-based MIMO systems employing large QAM constellations. The power efficiency gains of the QDA allow significan t improvements in bit rates and coverage for wireless systems in general.< strong><br></strong></p> END:VEVENT END:VCALENDAR