Enhancing Covert Secrecy Rate in a Zero-Forcing UAV Jammer-Assisted Covert Communication

Covert communications can hide confidential signals in environmental noise to avoid being detected and provide comprehensive security for wireless transmissions. However, there still exist significant risks in wireless transmission once being detected. In this letter, we propose a more secure covert...

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Veröffentlicht in:IEEE wireless communications letters 2024-12, Vol.13 (12), p.3375-3379
Hauptverfasser: Chen, Xinying, Chang, Zheng, Hamalainen, Timo
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Hamalainen, Timo
description Covert communications can hide confidential signals in environmental noise to avoid being detected and provide comprehensive security for wireless transmissions. However, there still exist significant risks in wireless transmission once being detected. In this letter, we propose a more secure covert scheme, where a multiple antennas transmitter, assisted by a multi-antenna UAV jammer, maximizes the covert secrecy rate under the scenarios of both correct and incorrect detection by a warden with both error detection probability and eavesdropping rate limitations satisfied. The transmitter and jammer adopt maximum ratio transmission (MRT) and zero-forcing, respectively, to maximize the transmission rate and minimize the interference at the legitimate receiver. First, we analyze the monotonicity of error detection probability to determine the optimal power detection threshold and the corresponding smallest error detection probability. Then, under this worst case, we jointly optimize the transmit and jamming power to maximize the covert secrecy rate while guaranteeing the covert and eavesdropping limits meet their requirements, respectively. Finally, simulation results are presented to prove the correctness of the theoretical conclusion and evaluate the effectiveness of our proposed scheme.
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source IEEE Electronic Library (IEL)
subjects Antennas
Autonomous aerial vehicles
Background noise
Covert communication
Eavesdropping
Error analysis
Error correction
Error correction & detection
Error detection
Gaussian signaling
Interference
Jammers
Jamming
Optimization
Owls
Precoding
Secrecy aspects
secure transmission
Security
UAV
Wireless communication
Wireless communications
zero-forcing
title Enhancing Covert Secrecy Rate in a Zero-Forcing UAV Jammer-Assisted Covert Communication
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