Covert mmWave Communication When the Warden Locates in the Beam Direction

被引：12
作者：
Ma, Ruiqian [1 ]
Yang, Weiwei [1 ]
Hu, Jinsong [2 ]
Lu, Xingbo [3 ]
机构：
[1] Army Engn Univ PLA, Coll Commun Engn, Nanjing 210007, Peoples R China
[2] Fuzhou Univ, Coll Phys & Informat Engn, Fujian Key Lab Intelligent Proc & Wireless Transmi, Fuzhou 350116, Peoples R China
[3] Acad Mil Sci PLA, Beijing 100091, Peoples R China
来源：
IEEE WIRELESS COMMUNICATIONS LETTERS | 2022年 / 11卷 / 12期
基金：
中国国家自然科学基金;
关键词：
Covert communication; finite blocklength; random frequency diverse array; mmWave;
D O I：
10.1109/LWC.2022.3210760
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
In this letter, the beamforming scheme based on random frequency diverse array (RFDA) is newly investigated to enhance the performance of covert mmWave communications. First, the closed-form expressions of covertness constraint are derived for the RFDA and the conventional phase array (PA) beamforming schemes, respectively. Then, the optimal transmit power and blocklength maximizing the average effective covert throughput (AECT) are derived for both beamforming schemes. Considering the pessimistic scenarios that Willie locates in its desired direction as Bob (but different distances), our examination shows the enhancement of maximum AECT by adopting the RFDA beamforming scheme. Besides, in this case, the maximum AECT for the RFDA beamforming scheme can be improved while that for the PA beamforming scheme remains unchanged as the number of antennas enlarges. Furthermore, it is revealed that the superior performance of the RFDA beamforming scheme is influenced by Willie's location, and the range of Willie in which the RFDA beamforming scheme outperforms the PA beamforming scheme is obtained.
引用
收藏
页码：2595 / 2599
页数：5
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