Ultra-Wideband Secure Communications and Direct RF Sampling Transceivers

Authors

Dimitrios Siafarikas, Florida International UniversityFollow

Document Type

Dissertation

Degree

Doctor of Philosophy (PhD)

Major/Program

Electrical Engineering

First Advisor's Name

John L. Volakis

First Advisor's Committee Title

Committee chair

Second Advisor's Name

Elias A. Alwan

Second Advisor's Committee Title

Committee member

Third Advisor's Name

Stavros Georgakopoulos

Third Advisor's Committee Title

Committee member

Fourth Advisor's Name

Ioannis Zisis

Fourth Advisor's Committee Title

Committee member

Keywords

Electrical and Computer Engineering, Systems and Communications

Date of Defense

6-28-2019

Abstract

Larger wireless device bandwidth results in new capabilities in terms of higher data rates and security. The 5G evolution is focus on exploiting larger bandwidths for higher though-puts. Interference and co-existence issues can also be addressed by the larger bandwidth in the 5G and 6G evolution. This dissertation introduces of a novel Ultra-wideband (UWB) Code Division Multiple Access (CDMA) technique to exploit the largest bandwidth available in the upcoming wireless connectivity scenarios. The dissertation addresses interference immunity, secure communication at the physical layer and longer distance communication due to increased receiver sensitivity. The dissertation presents the design, workflow, simulations, hardware prototypes and experimental measurements to demonstrate the benefits of wideband Code-Division-Multiple-Access. Specifically, a description of each of the hardware and software stages is presented along with simulations of different scenarios using a test-bench and open-field measurements. The measurements provided experimental validation carried out to demonstrate the interference mitigation capabilities. In addition, Direct RF sampling techniques are employed to handle the larger bandwidth and avoid analog components. Additionally, a transmit and receive chain is designed and implemented at 28 GHz to provide a proof-of-concept for future 5G applications. The proposed wideband transceiver is also used to demonstrate higher accuracy direction finding, as much as 10 times improvement.

Identifier

FIDC007821

ORCID

https://orcid.org/0000-0003-0320-4466

Recommended Citation

Siafarikas, Dimitrios, "Ultra-Wideband Secure Communications and Direct RF Sampling Transceivers" (2019). FIU Electronic Theses and Dissertations. 4214.
https://digitalcommons.fiu.edu/etd/4214