BEGIN:VCALENDAR VERSION:2.0 PRODID:IEEE vTools.Events//EN CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:America/Toronto BEGIN:DAYLIGHT DTSTART:20180311T030000 TZOFFSETFROM:-0500 TZOFFSETTO:-0400 RRULE:FREQ=YEARLY;BYDAY=2SU;BYMONTH=3 TZNAME:EDT END:DAYLIGHT BEGIN:STANDARD DTSTART:20181104T010000 TZOFFSETFROM:-0400 TZOFFSETTO:-0500 RRULE:FREQ=YEARLY;BYDAY=1SU;BYMONTH=11 TZNAME:EST END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTAMP:20180503T000000Z UID:42496D84-49C7-4A1E-B743-A32677EC4888 DTSTART;TZID=America/Toronto:20180413T110000 DTEND;TZID=America/Toronto:20180413T120000 DESCRIPTION:The next generation wireless networks – 5G- promises wider ba ndwidth to enable wide range of applications including autonomous vehicle\ , virtual reality and internet of things. A key feature in these receivers is beamforming that compensates for pathloss and allows directional commu nication. Although digital beamforming is the holy grail in the antenna ar ray technology\, high resolution ADCs are not affordable in each receiver path at this speed. A more pragmatic approach is hybrid beamforming that c ombines RF and LO and digital where appropriate. First\, cascaded PLL base d LO beamforming is introduced that achieves lower phase noise and elimina te the high frequency clock distribution power. The cascaded PLL consumes 26.9-mW from a 1-V supply and achieves less than 100-fs integrated jitter with -116.2 dBc/Hz and -112.6 dBc/Hz phase noise at 1-MHz offset for the i nteger-N and the fractional-N modes\, respectively. The fractional-N singl e-stage and cascaded PLLs achieve figure-of-merits (FoM) of -230.58 dB and -248.75 dB\, respectively. The FoM of the proposed cascaded PLL outperfor ms that of the reported state-of-the-art mm-Wave synthesizers making it a suitable candidate for 5G transceivers. The digital beamforming takes adva ntage of the channel diversity by distributing the resolution according to channel SNR. In addition\, it utilizes the correlated information between channels to perform energy efficient digitization of received signals. Th e collaborative ADC is designed with 8 SAR units each having 6-bit of reso lution and 2-bit Flash to monitor SNR. With the help of a coarse 2-bit fla sh\, the ADC can detect change in channel SNR\, and accordingly reconfigur e the four ADCs with variable resolution from 6-bit to 11-bit with less th an 1 ns mode switching time. This collaborative ADC performance is compare d with all 11- and all 9-bit. It reduces area and power by half and 41% re spectively with only 10% degradation of overall SNDR.\n\nSpeaker(s): Masum Hossain\, \n\nRoom: 302\, Bldg: Walter LIght Hall\, 19 Union St.\, Kingst on\, Ontario\, Canada LOCATION:Room: 302\, Bldg: Walter LIght Hall\, 19 Union St.\, Kingston\, On tario\, Canada ORGANIZER:saavedra@queensu.ca SEQUENCE:3 SUMMARY:Affordable Digital Beamforming for 5G Wireless URL;VALUE=URI:https://events.vtools.ieee.org/m/171533 X-ALT-DESC:Description: <br /><p>The next generation wireless networks &nda sh\; 5G- promises wider bandwidth to enable wide range of applications inc luding autonomous vehicle\, virtual reality and internet of things. A key feature in these receivers is beamforming that compensates for pathloss an d allows directional communication. Although digital beamforming is the ho ly grail in the antenna array technology\, high resolution ADCs are not af fordable in each receiver path at this speed. A more pragmatic approach is hybrid beamforming that combines RF and LO and digital where appropriate. First\, cascaded PLL based LO beamforming is introduced that achieves low er phase noise and eliminate the high frequency clock distribution power. &nbsp\;The cascaded PLL consumes 26.9-mW from a 1-V supply and achieves le ss than 100-fs integrated jitter with -116.2 dBc/Hz and -112.6 dBc/Hz phas e noise at 1-MHz offset for the integer-N and the fractional-N modes\, res pectively. The fractional-N single-stage and cascaded PLLs achieve figure- of-merits (FoM) of -230.58 dB and -248.75 dB\, respectively. The FoM of th e proposed cascaded PLL outperforms that of the reported state-of-the-art mm-Wave synthesizers making it a suitable candidate for 5G transceivers. T he digital beamforming takes advantage of the channel diversity by distrib uting the resolution according to channel SNR. In addition\, it utilizes t he correlated information between channels to perform energy efficient dig itization of received signals. The collaborative ADC is designed with 8 SA R units each having 6-bit of resolution and 2-bit Flash to monitor SNR. Wi th the help of a coarse 2-bit flash\, the ADC can detect change in channel SNR\, and accordingly reconfigure the four ADCs with variable resolution from 6-bit to 11-bit with less than 1 ns mode switching time. This collabo rative ADC performance is compared with all 11- and all 9-bit. It reduces area and power by half and 41% respectively with only 10% degradation of o verall SNDR.</p> END:VEVENT END:VCALENDAR