加权分数傅里叶辅助的上行NOMA隐蔽通信

doi:10.19665/j.issn1001-2400.2023.02.006

西安电子科技大学学报 ›› 2023, Vol. 50 ›› Issue (2): 54-63.doi: 10.19665/j.issn1001-2400.2023.02.006

加权分数傅里叶辅助的上行NOMA隐蔽通信

段正祥(),杨欣(),张兆林(),王伶()

西北工业大学电子信息学院,陕西西安 710072

收稿日期:2022-07-14 出版日期:2023-04-20 发布日期:2023-05-12
通讯作者: 杨欣(1990—),男,副研究员,E-mail:xinyang@nwpu.edu.cn
作者简介:段正祥(1995—),男,西北工业大学博士研究生,E-mail:dzx95@mail.nwpu.edu.cn;|张兆林(1978—),男,副教授,E-mail:z184@sina.com;|王伶(1978—),男,教授,E-mail:lingwang@nwpu.edu.cn
基金资助:
国家自然科学基金(61901390);国家自然科学基金(61871459);陕西省自然科学基础研究计划(2022KJXX-39)

Covert communication in uplink NOMA systems with weighted fractional Fourier transform

DUAN Zhengxiang(),YANG Xin(),ZHANG Zhaolin(),WANG Ling()

School of Electronics and Information,Northwestern Polytechnical University,Xi’an 710072,China

Received:2022-07-14 Online:2023-04-20 Published:2023-05-12

摘要/Abstract

摘要：

针对一个具有两阶段检测器的上行非正交多址接入系统,提出了随机功率分配和加权分数傅里叶变换来实现隐蔽通信。在该非正交多址接入系统中,存在一个可靠用户和隐蔽用户传输信息给基站,同时存在一个监听者企图侦察隐蔽用户的通信行为。设计了一种两阶段检测器,包括能量检测阶段和相似度检测阶段。通过相似度检测阶段为能量检测阶段提供先验概率,降低检错概率。针对所设计的两阶段检测器,提出了一种随机功率分配和加权分数傅里叶变换方案去掩盖隐蔽用户的传输,其中可靠用户采用随机功率分配而隐蔽用户采用加权分数傅里叶变换。给出了期望最小检错概率、可靠用户及隐蔽用户的中断概率的闭合表达式,并进行了仿真。在隐蔽约束和可靠约束下研究了最大期望隐蔽速率,以优化可靠用户的功率分配。研究表明,所设计的检测器有更低的期望最小检错概率,并改进了系统的隐蔽性能。

关键词: 隐蔽通信, 非正交多址介入, 随机功率分配, 加权分数傅里叶变换

Abstract:

In this paper,we investigate the covert communications in uplink nonorthogonal multiple access(NOMA) systems with the random power allocation and weighted fractional Fourier transform(WFRFT) scheme to confront a two-phase detector.In the NOMA system,a covert user(CU) and a reliable user(RU) transmit messages to Bob in the presence of a warden (Willie) who tries to detect the CU's transmission behavior.A two-phase detector,i.e.,energy detection and similarity detection phases,is designed to improve the detection performance.The similarity detection phase provides a priori probability for the energy detection phase and reduces the detection error probability.In addition,corresponding to the RU and CU,a random power allocation and WFRFT are proposed to cover the CU's transmissions.The expected minimum detection error probability(EMDEP) and connection outage probabilities(COPs) at the RU and CU are derived in closed-form expressions for the proposed scheme.To optimize the power allocation of the RU,the maximum expected covert rate(ECR) is analyzed under covertness and reliability constraints.Numerical results show that the proposed two-phase detector has a lower EMDEP,and that the random power allocation and WFRFT scheme improve the covertness performance.

Key words: cover communications, nonorthogonal multiple access, random power allocation, weighted fractional Fourier transform

中图分类号:

TN918.91

段正祥, 杨欣, 张兆林, 王伶. 加权分数傅里叶辅助的上行NOMA隐蔽通信[J]. 西安电子科技大学学报, 2023, 50(2): 54-63.

DUAN Zhengxiang, YANG Xin, ZHANG Zhaolin, WANG Ling. Covert communication in uplink NOMA systems with weighted fractional Fourier transform[J]. Journal of Xidian University, 2023, 50(2): 54-63.

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加权分数傅里叶辅助的上行NOMA隐蔽通信

Covert communication in uplink NOMA systems with weighted fractional Fourier transform

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