Multi-Antenna Jammer Assisted Covert Communications in Data Collected IoT with NOMA  

作　　者：Liwei Tao Weiwei Yang Xingbo Lu Ruiqian Ma Ling Yang Yi Song 

机构地区：[1]Mechanical Engineering Department,Army Academy of Artillery and Air Defense of PLA,Hefei 230031,China [2]College of Communication Engineering,Army Engineering University of PLA,Nanjing 210007,China [3]Academy of Military Sciences of PLA,Beijing 100091,China [4]College of Electronic Engineering,National University of Defense Technology of PLA,Hefei 230037,China [5]College of Railway Transportation,Hunan University of Technology,Zhuzhou 412000,China [6]School of Physics and Electronic Electrical Engineering,Huaiyin Normal University,Huaian 223399,China

出　　处：《China Communications》2023年第5期217-231,共15页中国通信（英文版）

基　　金：supported by the National Natural Science Foundation of China under Grant(no.62071486,no.61771487,no.62171464).

摘　　要：In this paper,we investigate covert communications in data collected IoT with NOMA,where the paired sensor nodes S_(m) and S_(n) transmit covert messages to a legitimate receiver(Bob)in the presence of a Warden(Willie).To confuse the detection at Willie,an extra multi-antenna friendly jammer(Jammer)has been employed to transmit artificial noise(AN)with random power.Based on the CSI of Willie is available or not at Jammer,three AN transmission schemes,including null-space artificial noise(NAN),transmit antenna selection(TAS),and zeroforcing beamforming(ZFB),are proposed.Furthermore,the closed-form expressions of expected minimum detection error probability(EMDEP)and joint connection outage probability(JCOP)are derived to measure covertness and reliability,respectively.Finally,the maximum effective covert rate(ECR)is obtained with a given covertness constraint.The numerical results show that ZFB scheme has the best maximum ECR in the case of the number of antennas satisfies N>2,and the same maximum ECR can be achieved in ZFB and NAN schemes with N=2.Moreover,TAS scheme also can improve the maximum ECR compared with the benchmark scheme(i.e.,signal-antenna jammer).In addition,a proper NOMA node pairing can further improve the maximum ECR.

关 键 词：IOT covert communications NOMA node pairing multi-antenna jammer 

分 类 号：TN929.5[电子电信—通信与信息系统] TP391.44[电子电信—信息与通信工程]