Performance Evaluation and Transmitter Optimization for AN-Aided FH Communication Against Time Misalignment  

作　　者：Song Changqing Lin Lang Qin Lizhi Xiao Fei Zhao Hongzhi Shao Shihai 

机构地区：[1]National Key Laboratory of Wireless Communications,University of Electronic Science and Technology of China,Chengdu 611731,China [2]The Laboratory of Electromagnetic Space Cognition and Intelligent Control,Beijing 100089,China [3]The Thirtieth Research Institude of China Electronic Science and Technology Group Corporation,Chengdu 610093,China

出　　处：《China Communications》2025年第3期86-103,共18页中国通信(英文版)

基　　金：supported in part by the National Natural Science Foundation of China under Grant 62071094;in part by the National Key Laboratory of Wireless Communications Foundation under Grant IFN202402;in part by the Postdoctoral Fellowship Program(Grade C)of China Postdoctoral Science Foundation under Grant GZC20240217.

摘　　要：To guarantee secure communication against eavesdropping and malicious attack,an artificial noise(AN)-aided frequency-hopping(FH)architecture is adopted in this article.But the inevitable time misalignment between the received signal and locally reconstructed AN will deteriorate the AN cancellation performance,yielding significant secrecy degradation at the FH receiver.In view of this,first,the AN cancellation performance under time misalignment is evaluated via signal to AN-plus-noise ratio,and the system secrecy is analyzed via secrecy rate.Then,to mitigate the performance degradation raised by time misalignment,the transmitting power allocation scheme for AN and confidential signal(CS)is optimized,and the optimal hopping period is designed.Notably,the obtained conclusions in both the performance evaluation and transmitter optimization sections hold no matter whether the eavesdropper can realize FH synchronization or not.Simulations verify that time misalignment will raise non-negligible performance degradation.Besides,the power ratio of AN to CS should decrease as time misalignment increases,and for perfect time synchronization,the transmitting power of AN and CS should be equivalent.In addition,a longer hopping period is preferred for secrecy enhancement when time misalignment gets exacerbated.

关 键 词：artificial noise(AN)cancellation hopping period design power allocation time misalignment 

分 类 号：TN914.41[电子电信—通信与信息系统]