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Retrodirective MIMO Communications

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Partitioned Pseudo-retrodirective Arrays for Capacity Expansion of Backscatter Communication Channels

Michael A. Varner; Mohammad Alhassoun; Gregory D. Durgin
2018 IEEE International Conference on RFID, Orlando, FL, April 2018

In this paper, we outline the benefits of subdividing a retrodirective array into segments and using MIMO-style (multiple-input, multiple-output) signaling to reflect multiple streams of independent data back to a reader.  The rules for making this happen are different than a conventional MIMO link.

Retro-Reflective RFID Tags

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Design and Evaluation of a Multi-modulation Retrodirective RFID Tag

Mohammad Alhassoun; Michael A. Varner; Gregory D. Durgin
2018 IEEE International Conference on RFID, Orlando, FL, April 2018

This paper is Mohammad Alhassoun’s award-winning idea for an RFID tag exhibits retrodirectivity. Unlike previous designs, this scheme can be implemented by a single chip that alternately load-modulates two inner ports of a rat-race hybrid.  Previous retrodirective designs have all required switches and electronics at multiple locations to reconfigure the structure, which greatly increases the cost of production.

Congratulations on the First Class, Dr. B

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Congratulations to GTPG alum, Raj Bhattacharjea, for teaching his first recitation class at Georgia Tech this summer. A handful of lucky students will have a section of ECE 2026 Digital Signal Processing from Dr. B. May it be the first of many!