Analog Least Mean Square Loop for Self-Interference Cancellation in Generalized Continuous Wave SAR

Authors

Anh Tuyen Le, University of Technology SydneyFollow
Yijiang Nan, University of Technology Sydney
Le Chung Tran, University of WollongongFollow
Xiaojing Huang, University of Technology SydneyFollow
Y J. Guo, University of Technology Sydney
J (Yiannis) Vardaxoglou, Loughborough University

RIS ID

131407

Publication Details

A. Le, Y. Nan, L. Tran, X. Huang, Y. Jay. Guo & Y. Vardaxoglou, "Analog Least Mean Square Loop for Self-Interference Cancellation in Generalized Continuous Wave SAR," in IEEE 88th Vehicular Technology Conference (VTC2018-Fall), 2018, pp. 1-5.

Abstract

Generalized continuous wave synthetic aperture radar (GCW-SAR) is a promising new imaging radar system since it applies the full-duplex (FD) transmission technique to achieve continuous signaling in order to overcome several fundamental limitations of the conventional pulsed SARs. As in any FD wireless communication system, self-interference (SI) is also a key problem which can impact on the GCW-SAR system. In this paper, the analog least mean square (ALMS) loop in the radio frequency domain is adopted to cancel the SI for a GCW-SAR system with periodic chirp signaling. The average residual SI power after the ALMS loop is analyzed theoretically by a stationary analysis. It is found that the ALMS loop not only works with random signals in general FD communication systems, but also works well with the periodic signal in GCW-SAR systems. Simulation results show that over 45 dB SI cancellation can be achieved by the ALMS loop which ensures the proper operation of the GCW-SAR system.