IEEE AP/CAS/ED/MTT/SSC Seminar

Title: Integrated True-Time-Delay based Hybrid Beamforming and Wideband Spatial Interference Cancellation for Large-Scale Arrays on Cellular / V2X / Airborne Platforms

Speaker: Prof. Subhanshu Gupta
Washington State University (Pullman, WA)

Date: Friday, October 18, 2019

Agenda:
2:00 - 2:10pm Sign-in and networking
2:10 - 3:30pm Seminar and Q&A

Location: Qualcomm AZ Multipurpose Room A/B (10155 Pacific Heights Blvd, San Diego, CA 92121)
Non-Qualcomm attendees: Please arrive 10-15 minutes early to find street parking or in nearby Qualcomm parking structures.

Cost: Free

Abstract:
Future millimeter-wave networks (mmW-nets) will operate in the upper mmW frequency band where more than 10 GHz of bandwidth can be used to meet the ever-increasing demands. Their realization will require addressing a completely new set of challenges including wider modulated bandwidths, larger antenna array sizes, and higher cell density. These new system requirements demand fundamental rethinking of signal processing and radio architectures including major breakthroughs in radio front-end architectures to enable wideband mmW-nets. This talk presents integrated true-time-delay (TTD) arrays to overcome many of the challenges in phased array antennas (PAA) for wideband interference suppression and data communication. We will introduce non-uniform-sampling based discrete-time switched-capacitor circuits to achieve the widest tunable range-to-resolution ratio necessary for next-generation communication and beam acquisition. Integral to the proposed circuit is an analog-multiply-and-accumulate processor that incorporates a reconfigurable phase-interpolator for precise digitally tunable delays and multiplication of the inputs signal to an orthogonal matrix. Example measurements with 100MHz modulated bandwidth will be shown for a multi-channel TTD array at baseband with 5ns/5ps range-to-resolution ratio. We will conclude the talk with insight into our ongoing research on time-based circuits and systems to achieve GHz modulated bandwidth and development of a closed-loop optimization testbed incorporating GHz data converters and multi-parameter optimization algorithms.

Speaker biography:
Subhanshu Gupta received the B.E. degree from the National Institute of Technology (NIT), Trichy, India, in 2002, and the M.S. and Ph.D. degrees from the University of Washington in 2006 and 2010, respectively. From 2011 to 2014, he was with the RFIC Group at Maxlinear, where he was involved in design of silicon transceivers and data converters. He is currently an Assistant Professor of electrical engineering and computer science with Washington State University. He is a Senior Member of the IEEE and a recipient of the Analog Devices Outstanding Student Designer Award in 2008 and IEEE RFIC Symposium Best Student Paper Award (3rd position) in 2011. His research interests include analog-to-digital converters, wireless transceivers, sparse signal processing, and stochastic hardware optimization.