Temporary campus guidelines for any gathering other than academic classes, professional education programs (GTPE), or department meetings are available at specialevents.gatech.edu/fall-2020-events.

Tuesday, February 25 2020
3:00pm - 4:00pm
Technology Square Research Building 118 | 85 Fifth Street NW | Atlanta, GA | 30308
For more information:
Carol Mills 

PRC Program & Operations Manager,
Pettit Building, Room 108
(404) 894-3662

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3D SYSTEMS PACKAGING RESEARCH CENTER DISTINGUISHED LECTURE: Code Domain Approaches to High Dynamic Range for Full Duplex Communication and Spectrum Compression and Linearized RF Silicon Photonics

Code Domain Approaches to High Dynamic Range for Full Duplex Communication and Spectrum Compression and Linearized RF Silicon Photonics

Professor of Electrical and Computer Engineering, University of California – Santa Barbara

Abstract: 5G offers the next step towards communication services that trade-off data rate, latency, coverage, and power consumption. However, an outstanding challenge not addressed with 5G is realizing a wireless technology that can transmit and receive in any RF channel under any interference environment. Considerable possibilities exist to investigate new wireless circuits and systems below 6 GHz. An example is full-duplex communication, which could theoretically improve the spectral efficiency or channel estimation. However, full duplex places significant dynamic range requirements on the receiver to tolerate the strong transmitter interference. I will present a code-domain multiple access technique that can realize more than 120 dB of self-interference rejection in the receiver while tolerating 30 dBm of transmit power. A key feature is code-domain filtering to relax the potential distortion generated in the receiver and realize a full-duplex link without significant power penalties at RF bands. Additionally, I will describe a complementary approach to digital modulation that mitigates out-of-band emissions due to switching. Code-domain transmitters and receivers have been realized in 45-nm SOI CMOS and will be presented for model/hardware correlation. I will also present research efforts that re-evaluate RF silicon photonic receivers to support RF and millimeter-wave MIMO. Silicon photonic devices offer a low-cost platform that might potentially support co integration of electronic and photonic circuitry. To overcome the spur-free dynamic range issues confronting RF electro-optic conversion, we will briefly review approaches to improve the linearity of silicon photonic modulators.

Bio: James F. Buckwalter is currently a Professor of Electrical and Computer Engineering with UCSB and was the recipient of a 2004 IBM Ph.D. Fellowship, 2007 Defense Advanced Research Projects Agency (DARPA) Young Faculty Award, 2011 NSF CAREER Award, and 2015 IEEE MTT-S Young Engineer Award. He is a senior member of the IEEE and has published more than 170 conference and journal papers on research related to RF, millimeter-wave, and high-speed optoelectronic circuits and systems.