Relaying via Cooperative Jamming in Covert Wireless Communications

Date

2019

Authors

Shahzad, Khurram

Journal Title

Journal ISSN

Volume Title

Publisher

IEEE

Abstract

In this work, a covert communication scheme under block-fading channels is proposed where the relay, apart from forwarding source's information to the destination, also acts as a cooperative jammer. Stating precisely, the relay amplifies source's signal when required to relay the signal to the destination, otherwise it transmits artificial noise with random power, causing errors in the received signal statistics of the adversary, Willie, who employs a radiometer for detection of covert transmissions. Stating the condition under which Willie makes detection errors, we first find the optimal detection threshold of Willie's detector and his minimum detection error probability and then derive the expected value of this error probability, establishing Willies detection performance from the perspective of the covert communication pair. Furthermore, for a given maximum transmit power at the relay, we derive a closed-form expression for the optimal transmit power of covert communication. Our numerical results illustrate the advantage cooperative jamming offers for achieving covertness, and demonstrate how the choice of transmit power used for covert transmissions is affected by Willie's error performance and required level of covertness.

Description

Keywords

Physical Layer Security, Covert Wireless Communications, Cooperative Jamming, Artificial Noise, Low Probability of Detection

Citation

Source

2018, 12th International Conference on Signal Processing and Communication Systems, ICSPCS 2018 - Proceedings

Type

Conference paper

Book Title

Entity type

Access Statement

License Rights

DOI

10.1109/ICSPCS.2018.8631772

Restricted until

2099-12-31