Nov 6 (Fri): "Blocker and Multipath Tolerant, Full-Duplex Receivers using RF Code-Domain Signal Processing," Ahmed Hamza Sayed, ECE PhD Defense

Date and Time
Zoom Meeting

Meeting ID: 876 5511 5718
Passcode: 652787


Full-Duplex (FD) communications allow the concurrent operation of the TX and RX of an RF transceiver at the same frequency channel offering multiple advantages for wireless communications such as increased bandwidth efficiency. However, the RX of an FD node should tolerate high TX self-interference (TX SI) power levels (~30 dBm) while detecting small desired RX signals (~-100 dBm). The required dynamic range (DR) is addressed through a variety of TX SI rejection techniques in the RF, analog, and digital domains.

This thesis presents an RF code-domain signal processing technique that increases the achieved rejection for FD radios. FD DR is enhanced by assigning orthogonal PN codes to the TX and RX signals of an FD transceiver and performing code correlation in the RF domain through code selective filters. RF code-domain signal processing increases the achieved TX-SI rejection by >50 dB along with enhancing the RX linearity by >20 dB while providing 9 dB SNR improvement in multipath environments.

The thesis reports various CMOS chip implementations of the proposed RF code-domain signal processing approach including code-pass and code-notch filters, a reconfigurable multi-band/high-order notch filter, a high-rejection code-domain receiver, and a 3-finger multipath-tolerant rake RX. Moreover, the thesis presents an FD link demonstration combining the proposed code-domain approach with circulators and digital SI cancellation for a complete node evaluation with >100 dB TX SI rejection.


Ahmed Hamza received the B.Sc. and M.Sc. degrees in electronics and communications systems engineering from Ain Shams University, Cairo, Egypt, in 2012 and 2016, respectively. He is currently pursuing the Ph.D. degree at the University of California at Santa Barbara, Santa Barbara, CA, USA. His research interests include RF and mm-wave integrated circuits, and analog/mixed-signal design for wireline and wireless applications.

Hosted by: Professor James Buckwalter

Submitted by: Ahmed Hamza Sayed <>