Joint jammer selection and power optimization in covert communications against a warden with uncertain locations

doi:10.1016/j.dcan.2024.10.019

	Joint jammer selection and power optimization in covert communications against a warden with uncertain locations
	Han, Zhijun 1,2,3; Zhou, Yiqing 1,2,3; Zhang, Yu 1,2,3; Zheng, Tong-Xing 4; Liu, Ling 1,2,3; Shi, Jinglin 1,2,3
	2025-08-01
发表期刊	DIGITAL COMMUNICATIONS AND NETWORKS
ISSN	2468-5925
卷号	11 期号:4 页码:1114-1124
摘要	In covert communications, joint jammer selection and power optimization are important to improve performance. However, existing schemes usually assume a warden with a known location and perfect Channel State Information (CSI), which is difficult to achieve in practice. To be more practical, it is important to investigate covert communications against a warden with uncertain locations and imperfect CSI, which makes it difficult for legitimate transceivers to estimate the detection probability of the warden. First, the uncertainty caused by the unknown warden location must be removed, and the Optimal Detection Position (OPTDP) of the warden is derived which can provide the best detection performance (i.e., the worst case for a covert communication). Then, to further avoid the impractical assumption of perfect CSI, the covert throughput is maximized using only the channel distribution information. Given this OPTDP based worst case for covert communications, the jammer selection, the jamming power, the transmission power, and the transmission rate are jointly optimized to maximize the covert throughput (OPTDP-JP). To solve this coupling problem, a Heuristic algorithm based on Maximum Distance Ratio (H-MAXDR) is proposed to provide a sub-optimal solution. First, according to the analysis of the covert throughput, the node with the maximum distance ratio (i.e., the ratio of the distances from the jammer to the receiver and that to the warden) is selected as the friendly jammer (MAXDR). Then, the optimal transmission and jamming power can be derived, followed by the optimal transmission rate obtained via the bisection method. In numerical and simulation results, it is shown that although the location of the warden is unknown, by assuming the OPTDP of the warden, the proposed OPTDP-JP can always satisfy the covertness constraint. In addition, with an uncertain warden and imperfect CSI, the covert throughput provided by OPTDP-JP is 80% higher than the existing schemes when the covertness constraint is 0.9, showing the effectiveness of OPTDP-JP.
关键词	Covert communications Uncertain warden Jammer selection Power optimization Throughput maximization
DOI	10.1016/j.dcan.2024.10.019
收录类别	SCI
语种	英语
资助项目	CAS Project for Young Scientists in Basic Research[YSBR-035] ; Jiangsu Provincial Key Research and Development Program[BE2021013-2]
WOS研究方向	Telecommunications
WOS类目	Telecommunications
WOS记录号	WOS:001590660500001
出版者	KEAI PUBLISHING LTD
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.204/handle/2XEOYT63/41665
专题	中国科学院计算技术研究所期刊论文_英文
通讯作者	Zhou, Yiqing
作者单位	1.Chinese Acad Sci, Inst Comp Technol, State Key Lab Processors, Beijing 100190, Peoples R China 2.Beijing Key Lab Mobile Comp & Pervas Device, Beijing 100080, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Xi An Jiao Tong Univ, Sch Informat & Commun Engn, Xian 710049, Peoples R China
推荐引用方式 GB/T 7714	Han, Zhijun,Zhou, Yiqing,Zhang, Yu,et al. Joint jammer selection and power optimization in covert communications against a warden with uncertain locations[J]. DIGITAL COMMUNICATIONS AND NETWORKS,2025,11(4):1114-1124.
APA	Han, Zhijun,Zhou, Yiqing,Zhang, Yu,Zheng, Tong-Xing,Liu, Ling,&Shi, Jinglin.(2025).Joint jammer selection and power optimization in covert communications against a warden with uncertain locations.DIGITAL COMMUNICATIONS AND NETWORKS,11(4),1114-1124.
MLA	Han, Zhijun,et al."Joint jammer selection and power optimization in covert communications against a warden with uncertain locations".DIGITAL COMMUNICATIONS AND NETWORKS 11.4(2025):1114-1124.