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Dual-function radar–communications: information transmission during FDA radar listening mode

Published online by Cambridge University Press:  22 July 2019

Abdul Rahman Al-Salehi
Affiliation:
Faculty of Engineering and Technology, International Islamic University, Islamabad, Pakistan
Ijaz Mansoor Qureshi
Affiliation:
Department of Electrical Engineering, Air University, Islamabad, Pakistan Institute of Signals, Systems and Soft Computing (ISSS), Islamabad, Pakistan
Aqdas Naveed Malik
Affiliation:
Faculty of Engineering and Technology, International Islamic University, Islamabad, Pakistan
Wasim Khan
Affiliation:
Faculty of Engineering and Technology, International Islamic University, Islamabad, Pakistan
Abdul Basit
Affiliation:
Faculty of Engineering and Technology, International Islamic University, Islamabad, Pakistan

Abstract

We investigate the frequency diverse array (FDA) for joint radar and communication systems. The basic idea is to use the transmitter/receiver modules of the radar system for communication purpose during listening mode as a secondary function. The radar will be performing its routine functions during the active mode as a primary function. An FDA at the transmitter side will be used to produce an orthogonal frequency division multiplexed signal, which is proposed for the communication system. The directivity of the radar antenna, FDA in this case, provides an additional advantage to mitigate the interferences other than the Direction of Interest (DoI). The proposed technique allows two beampatterns to be transmitted sequentially from the same FDA structure. Due to the communication signal transmission in the mainlobe of the second beampattern, the bit error rate achieved in the mainlobe is better than the existing techniques using the sidelobe transmission for communications. At the receiver, both incoming signals of radar and communication will share a different spatial angle. Simulation results indicate the novelty of the idea to suppress the interferences in terms of DoI. Furthermore, we analyzed the signal-to-interference ratio and Cramer–Rao lower bounds for angle and range estimation for the proposed technique.

Type
Research Papers
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2019 

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