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There is now a CONTENT FREEZE for Mercury while we switch to a new platform. It began on Friday, March 10 at 6pm and will end on Wednesday, March 15 at noon. No new content can be created during this time, but all material in the system as of the beginning of the freeze will be migrated to the new platform, including users and groups. Functionally the new site is identical to the old one. webteam@gatech.edu
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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.
