BEGIN:VCALENDAR VERSION:2.0 PRODID:IEEE vTools.Events//EN CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:Europe/Warsaw BEGIN:DAYLIGHT DTSTART:20260329T030000 TZOFFSETFROM:+0100 TZOFFSETTO:+0200 RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=3 TZNAME:CEST END:DAYLIGHT BEGIN:STANDARD DTSTART:20251026T020000 TZOFFSETFROM:+0200 TZOFFSETTO:+0100 RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10 TZNAME:CET END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTAMP:20251117T103317Z UID:3AFEC846-8993-4CF3-B3DC-139C6B54F3C3 DTSTART;TZID=Europe/Warsaw:20251117T090000 DTEND;TZID=Europe/Warsaw:20251117T100000 DESCRIPTION:The signals associated to widely employed techniques like OFDM (Orthogonal Frequency Division Multiplexing) and/or MIMO (Multi-Input\, Mu lti-Output) schemes can have very large envelope fluctuations and PAPR (Pe ak-to-Average Power Rate)\, which makes them prone to nonlinear distortion effects like the ones associated to quantizers and power amplifiers. It i s widely accepted that nonlinear distortion effects should be avoided in d igital communications. There are two main reasons for this: the theoretica l analysis of the impact of a given nonlinear device is not simple\; and n onlinear devices can lead to significant spectral widening effects and/or performance degradation. For these reasons\, there has been a huge effort in the design of quasi-linear amplifiers\, as well as techniques to reduce the PAPR of digital signals.\n\nIt was recently shown that strong nonline ar distortion effects do not necessarily mean performance degradation. Thi s is due to the fact that the nonlinear distortion component has some info rmation on the transmitted signals\, which can be employed to improve the performance. In fact\, the optimum maximum likelihood (ML) performance of nonlinear OFDM schemes can even be better than the performance of the corr esponding linear. However\, the complexity of optimum ML receivers is proh ibitively high\, even for a moderate number of subcarriers\, which lead to the development of practical\, sub-optimum receivers able to achieve the optimum performance of nonlinear OFDM.\n\nIn this tutorial we start by pre senting some key results on the impact of nonlinear operations in the spec tral characterization and performance of digital communications. Then\, we study the optimum performance of nonlinear OFDM and MIMO schemes. Finally \, we present some practical receivers able to harvest these potential non linear performance gains.\n\nSpeaker(s): Rui Dinis\n\nRoom: P243\, Polanka 3\, Poznań\, Wielkopolskie\, Poland LOCATION:Room: P243\, Polanka 3\, Poznań\, Wielkopolskie\, Poland ORGANIZER:pawel.kryszkiewicz@put.poznan.pl SEQUENCE:12 SUMMARY:Distinguished Lecturer Tour "Receiver Design for Nonlinear Systems - Turning Hardware Imperfections in in Performance Gains " URL;VALUE=URI:https://events.vtools.ieee.org/m/515424 X-ALT-DESC:Description: <br /><p class="MsoNormal" style="text-align: justi fy\;"><span style="font-size: 11.0pt\; mso-bidi-font-size: 12.0pt\;">The s ignals associated to widely employed techniques like OFDM (Orthogonal Freq uency Division Multiplexing) and/or MIMO (Multi-Input\, Multi-Output) sche mes can have very large envelope fluctuations and PAPR (Peak-to-Average Po wer Rate)\, which makes them prone to nonlinear distortion effects like th e ones associated to quantizers and power amplifiers. It is widely accepte d that nonlinear distortion effects should be avoided in digital communica tions. There are two main reasons for this: the theoretical analysis of th e impact of a given nonlinear device is not simple\; and nonlinear devices can lead to significant spectral widening effects and/or performance degr adation. For these reasons\, there has been a huge effort in the design of quasi-linear amplifiers\, as well as techniques to reduce the PAPR of dig ital signals. </span></p>\n<p class="MsoNormal" style="text-align: justify \;"><span style="font-size: 11.0pt\; mso-bidi-font-size: 12.0pt\;">It was recently shown that strong nonlinear distortion effects do not necessarily mean performance degradation. This is due to the fact that the nonlinear distortion component has some information on the transmitted signals\, whi ch can be employed to improve the performance. In fact\, the optimum maxim um likelihood (ML) performance of nonlinear OFDM schemes can even be bette r than the performance of the corresponding linear. However\, the complexi ty of optimum ML receivers is prohibitively high\, even for a moderate num ber of subcarriers\, which lead to the development of practical\, sub-opti mum receivers able to achieve the optimum performance of nonlinear OFDM.</ span></p>\n<p class="MsoNormal" style="text-align: justify\;"><span style= "font-size: 11.0pt\; mso-bidi-font-size: 12.0pt\;">In this tutorial we sta rt by presenting some key results on the impact of nonlinear operations in the spectral characterization and performance of digital communications. Then\, we study the optimum performance of nonlinear OFDM and MIMO schemes . Finally\, we present some practical receivers able to harvest these pote ntial nonlinear performance gains.</span></p> END:VEVENT END:VCALENDAR