BEGIN:VCALENDAR VERSION:2.0 PRODID:IEEE vTools.Events//EN CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:Turkey BEGIN:DAYLIGHT DTSTART:20380119T061407 TZOFFSETFROM:+0300 TZOFFSETTO:+0300 RRULE:FREQ=YEARLY;BYDAY=3TU;BYMONTH=1 TZNAME:+03 END:DAYLIGHT BEGIN:STANDARD DTSTART:20160907T000000 TZOFFSETFROM:+0300 TZOFFSETTO:+0300 RRULE:FREQ=YEARLY;BYDAY=1WE;BYMONTH=9 TZNAME:+03 END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTAMP:20190420T000703Z UID:32BF46D6-4524-44B1-A19E-8E1FA839D68C DTSTART;TZID=Turkey:20190412T133000 DTEND;TZID=Turkey:20190412T153000 DESCRIPTION:Speaker: Assoc. Prof. Melda Yüksel\, TOBB-ETÜ\n\nTopic: "Prec oder Design for Downlink Multiuser MIMO Systems"\n\nLocation: Middle East Technical University\, Ankara\, Turkey\n\nAbstract: In this work\, a downl ink wireless communication channel is considered. The base station (BS) ha s common data for all users\, unicast data for a set of intended users\, a nd transmits the superposition of these messages. This setting neither fal ls into the non-orthogonal multiple access (NOMA) nor into the multi-group multicasting literatures. In NOMA systems\, the BS has unicast data for a ll users\, and multiple users share the same resources. In multi-group mul ticasting\, there are non-overlapping groups\, each demanding a different multicast message. This paper studies precoder design to achieve maximum w eighted sum rate (WSR). It is first shown that the precoders designed for WSR maximization and weighted minimum mean square error (WMMSE) minimizati on are equivalent. Secondly\, an iterative\, low complexity algorithm (nam ed as WMMSE)\, based on WMMSE transmit precoders and receivers\, is propos ed. Another low-complexity precoder\, the phase aligned zero forcing (PAZF ) precoder is also introduced. The results show that both algorithms conve rge fast. The WMMSE algorithm outperforms both PAZF and the zero-forcing ( ZF) precoder for all signal-to-noise ratio (SNR) ranges. It offers better interference management and high coherent combining gains for common data\ , while PAZF finds the optimal phase rotation on the ZF precoder\, and inc reases coherent combining gains.\n\nBio: Melda Yuksel received the B.S. de gree in electrical and electronics engineering from Middle East Technical University\, Ankara\, Turkey\, in 2001\, and the Ph.D. degree in electrica l engineering from Polytechnic Institute of New York University\, Brooklyn \, NY\, in August 2007. She joined TOBB University of Economics and Techno logy\, Ankara\, Turkey\, in Fall 2007\, where she is currently an associat e professor. Her research interests are in information theory\, communicat ion theory and wireless communications. Dr. Yuksel is the recipient of the best paper award at the Communication Theory Symposium of the 2007 IEEE I nternational Conference on Communications and the Turkish National Science Foundation CAREER Award. Dr. Yuksel was the treasurer of 2013 IEEE Intern ational Symposium of Information Theory. She is currently serving as an ed itorial board member of PHYCOM\, Physical Communication.\n\nSpeaker(s): As soc. Prof. Melda Yuksel\, \n\nAnkara\, Ankara\, Türkiye LOCATION:Ankara\, Ankara\, Türkiye ORGANIZER:ozergul@metu.edu.tr SEQUENCE:0 SUMMARY:IEEE AP/MTT/EMC/ED TURKEY CHAPTER SEMINAR SERIES -- SEMINAR 48 URL;VALUE=URI:https://events.vtools.ieee.org/m/198004 X-ALT-DESC:Description: <br /><p>Speaker: Assoc. Prof. Melda Y&uuml\;ksel\, TOBB-ET&Uuml\;</p>\n<p>Topic: "Precoder Design for Downlink Multiuser MIM O Systems"</p>\n<p>Location:&nbsp\;Middle East Technical University\, Anka ra\, Turkey</p>\n<p>Abstract: In this work\, a downlink wireless communica tion channel is considered. The base station (BS) has common data for all users\, unicast data for a set of intended users\, and transmits the super position of these messages. This setting neither falls into the non-orthog onal multiple access (NOMA) nor into the multi-group multicasting literatu res. In NOMA systems\, the BS has unicast data for all users\, and multipl e users share the same resources. In multi-group multicasting\, there are non-overlapping groups\, each demanding a different multicast message. Thi s paper studies precoder design to achieve maximum weighted sum rate (WSR) . It is first shown that the precoders designed for WSR maximization and w eighted minimum mean square error (WMMSE) minimization are equivalent. Sec ondly\, an iterative\, low complexity algorithm (named as WMMSE)\, based o n WMMSE transmit precoders and receivers\, is proposed. Another low-comple xity precoder\, the phase aligned zero forcing (PAZF) precoder is also int roduced. The results show that both algorithms converge fast. The WMMSE al gorithm outperforms both PAZF and the zero-forcing (ZF) precoder for all s ignal-to-noise ratio (SNR) ranges. It offers better interference managemen t and high coherent combining gains for common data\, while PAZF finds the optimal phase rotation on the ZF precoder\, and increases coherent combin ing gains.</p>\n<p>Bio: Melda Yuksel received the B.S. degree in electrica l and electronics engineering from Middle East Technical University\, Anka ra\, Turkey\, in 2001\, and the Ph.D. degree in electrical engineering fro m Polytechnic Institute of New York University\, Brooklyn\, NY\, in August 2007. She joined TOBB University of Economics and Technology\, Ankara\, T urkey\, in Fall 2007\, where she is currently an associate professor. Her research interests are in information theory\, communication theory and wi reless communications. Dr. Yuksel is the recipient of the best paper award at the Communication Theory Symposium of the 2007 IEEE International Conf erence on Communications and the Turkish National Science Foundation CAREE R Award. Dr. Yuksel was the treasurer of 2013 IEEE International Symposium of Information Theory. She is currently serving as an editorial board mem ber of PHYCOM\, Physical Communication.</p> END:VEVENT END:VCALENDAR