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:20260427T154855Z UID:1DDBA40F-B0A5-4996-9BED-412175496909 DTSTART;TZID=America/Los_Angeles:20260421T140000 DTEND;TZID=America/Los_Angeles:20260421T150000 DESCRIPTION:Frequency-Domain Cross-Layer Diversity Techniques - Efficient W ays of Coping with Lost Packets in Broadband Wireless Systems\n\nThe desig n of broadband wireless communications presents considerable challenges. T he propagation conditions can be very hostile (e.g.\, highly dispersive ch annels and/or deep fading or shadowing effects). This is especially true f or systems operating in mm-wave conditions\, where one must rely in LoS an d/or reflected rays. Moreover\, these systems are expected to have power a nd spectral efficiencies\, together with high QoS requirements. There are also implementation complexity constraints\, especially at the mobile term inals.\n\nPrefix-assisted block transmission techniques combined with freq uency-domain detection are known to be suitable for high rate transmission over severely time-dispersive channels. The most popular modulations base d on this concept are OFDM (Orthogonal Frequency-Division Multiplexing) an d SC-FDE (Single-Carrier with Frequency-Domain Equalization). However\, th e severe propagation conditions in multiuser wireless systems make it like ly that a non-negligible fraction of the transmitted packets will be lost\ , either due to deep fading/shadowing effects or due to collisions in the MAC (Medium Access Control) phase.\n\nThe traditional approach to cope wit h lost packets is to drop them and ask for its retransmission. However\, e ven packets with a large number of bit errors have useful information on t he transmitted blocks that can be employed to improve the detection perfor mance. To take advantage of this\, we need to employ a cross-layer approac h combining PHY\, MAC and LLC layer aspects to cope with lost packets. In this talk we show how we can design powerful cross-layer network diversity techniques specially designed for broadband wireless systems employing bl ock transmission techniques combined with frequency domain detection.\n\nR oom: 430\, Bldg: EOW\, 3800 Finnerty Road\, Room 110 Saunders Annex\, Vict oria\, British Columbia\, Canada\, V8P5C2 LOCATION:Room: 430\, Bldg: EOW\, 3800 Finnerty Road\, Room 110 Saunders Ann ex\, Victoria\, British Columbia\, Canada\, V8P5C2 ORGANIZER:cai@uvic.ca SEQUENCE:8 SUMMARY:Frequency-Domain Cross-Layer Diversity Techniques - Efficient Ways of Coping with Lost Packets in Broadband Wireless Systems URL;VALUE=URI:https://events.vtools.ieee.org/m/546308 X-ALT-DESC:Description: <br /><p class="MsoNormal" style="text-align: cente r\;" align="center"><strong style="mso-bidi-font-weight: normal\;"><span s tyle="font-size: 13.0pt\; mso-bidi-font-size: 10.0pt\; font-family: 'Times New Roman Bold'\;">Frequency-Domain Cross-Layer Diversity Techniques - Ef ficient Ways of Coping with Lost Packets in Broadband Wireless Systems<br> <span style="mso-spacerun: yes\;">&nbsp\;</span></span></strong></p>\n<p c lass="MsoNormal" style="text-align: justify\;"><span style="font-size: 11. 0pt\; mso-bidi-font-size: 12.0pt\;">The design of broadband wireless commu nications presents considerable challenges. The propagation conditions can be very hostile (e.g.\, highly dispersive channels and/or deep fading or shadowing effects). This is especially true for systems operating in mm-wa ve conditions\, where one must rely in LoS and/or reflected rays. Moreover \, these systems are expected to have power and spectral efficiencies\, to gether with high QoS requirements. There are also implementation complexit y constraints\, especially at the mobile terminals.</span></p>\n<p class=" MsoNormal" style="text-align: justify\;"><span style="font-size: 11.0pt\; mso-bidi-font-size: 12.0pt\;">Prefix-assisted block transmission technique s combined with frequency-domain detection are known to be suitable for hi gh rate transmission over severely time-dispersive channels. The most popu lar modulations based on this concept are OFDM (Orthogonal Frequency-Divis ion Multiplexing) and SC-FDE (Single-Carrier with Frequency-Domain Equaliz ation). However\, the severe propagation conditions in multiuser wireless systems make it likely that a non-negligible fraction of the transmitted p ackets will be lost\, either due to deep fading/shadowing effects or due t o collisions in the MAC (Medium Access Control) phase. </span></p>\n<p cla ss="MsoNormal" style="text-align: justify\;"><span style="font-size: 11.0p t\; mso-bidi-font-size: 12.0pt\;">The traditional approach to cope with lo st packets is to drop them and ask for its retransmission. However\, even packets with a large number of bit errors have useful information on the t ransmitted blocks that can be employed to improve the detection performanc e. To take advantage of this\, we need to employ a cross-layer approach co mbining PHY\, MAC and LLC layer aspects to cope with lost packets. In this talk we show how we can design powerful cross-layer network diversity tec hniques specially designed for broadband wireless systems employing block transmission techniques combined with frequency domain detection. </span>< /p> END:VEVENT END:VCALENDAR