BEGIN:VCALENDAR VERSION:2.0 PRODID:IEEE vTools.Events//EN CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:America/New_York BEGIN:DAYLIGHT DTSTART:20240310T030000 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:20240115T173312Z UID:227B2E49-5CB1-466C-A6D4-2283E498B5CD DTSTART;TZID=America/New_York:20240111T180000 DTEND;TZID=America/New_York:20240111T193000 DESCRIPTION:The design of broadband wireless communications presents consid erable 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-wave conditions\, where one must rely in LoS and/or reflected rays. Moreover\, these systems are expe cted to have power and spectral efficiencies\, together with high QoS requ irements. There are also implementation complexity constraints\, especiall y at the mobile terminals.\n\nPrefix-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.\n\nThe traditional approach to cope with lost packets is to drop them and ask for its retrans mission. However\, even packets with a large number of bit errors have use ful information on the transmitted blocks that can be employed to improve the detection performance. To take advantage of this\, we need to employ a cross-layer approach combining PHY\, MAC and LLC layer aspects to cope wi th lost packets. In this talk we show how we can design powerful cross-lay er network diversity techniques specially designed for broadband wireless systems employing block transmission techniques combined with frequency do main detection.\n\nSpeaker(s): Rui Dinis\n\nRoom: EV003.309\, Concordia Un iversity\, 1515 Ste. Catherine West\, MONTREAL\, Quebec\, Canada\, H3G 1M8 LOCATION:Room: EV003.309\, Concordia University\, 1515 Ste. Catherine West\ , MONTREAL\, Quebec\, Canada\, H3G 1M8 ORGANIZER:anader.benyamin@ieee.org SEQUENCE:2 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/398640 X-ALT-DESC:Description: <br /><p>The design of broadband wireless communica tions presents considerable challenges. The propagation conditions can be very hostile (e.g.\, highly dispersive channels and/or deep fading or shad owing effects). This is especially true for systems operating in mm-wave c onditions\, where one must rely in LoS and/or reflected rays. Moreover\, t hese systems are expected to have power and spectral efficiencies\, togeth er with high QoS requirements. There are also implementation complexity co nstraints\, especially at the mobile terminals.</p>\n<p>Prefix-assisted bl ock transmission techniques combined with frequency-domain detection are k nown to be suitable for high rate transmission over severely time-dispersi ve channels. The most popular modulations based on this concept are OFDM ( Orthogonal Frequency-Division Multiplexing) and SC-FDE (Single-Carrier wit h Frequency-Domain Equalization). However\, the severe propagation conditi ons in multiuser wireless systems make it likely that a non-negligible fra ction 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.</p>\n<p>The traditional approach to cope with lost packets is to dr op them and ask for its retransmission. However\, even packets with a larg e number of bit errors have useful information on the transmitted blocks t hat can be employed to improve the detection performance. To take advantag e of this\, we need to employ a cross-layer approach combining PHY\, MAC a nd LLC layer aspects to cope with lost packets. In this talk we show how w e can design powerful cross-layer network diversity techniques specially d esigned for broadband wireless systems employing block transmission techni ques combined with frequency domain detection.</p> END:VEVENT END:VCALENDAR