| 摘要: |
| 针对协作非正交多址接入（Non-orthogonal Multiple Access,NOMA）系统中用户充当中继并存在窃听者的场景，提出了一种新型协作干扰传输方案，以提高该系统的安全性。在第一时隙，基站将混合信号进行广播，同时为了干扰窃听者，信道条件较差的用户采用全双工的工作模式，发出协作干扰信号对窃听者进行干扰。在第二时隙，信道条件较好的用户充当中继将己解码的信息转发给信道条件较差的用户，同时信道条件较差的用户继续发出协作干扰信号以干扰窃听者。充当中继的用户由于功耗过大可能会引起该节点供能不足，因此对该节点引入无线携能（Simultaneous Wireless Information and Power Transfer,SWIPT）技术构成SWIPT-NOMA系统。为了衡量针对SWIPT-NOMA系统所提出的新型传输方案的安全性能，推导了用户的保密中断概率的表达式并仿真验证了该方案的有效性。 |
| 关键词: 非正交多址接入(NOMA) 协作干扰 无线携能(SWIPT) 物理层安全 保密中断概率 |
| DOI： |
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| 基金项目:国家科技重大专项(2017ZX03001004) |
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| Research on physical layer security of cooperative SWIPT-NOMA system |
| LONG Ken,TAN Luyao,WANG Yi,CHEN Xing,WANG Yaling |
| (School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China) |
| Abstract: |
| In order to improve the security of cooperative non-orthogonal multiple access(NOMA) system,a novel transmission scheme with cooperative jamming is proposed,in the presence of the condition that users act as relays and eavesdroppers exist.In the first time slot,the base station broadcasts the superimposed signal,at the same time,for the purpose of interfering with the eavesdropper,the user with poor channel conditions uses the pattern of full-duplex,which will send cooperative jamming signal.In the second time slot,the user with better channel conditions acts as relays to forward the decoded information to the users with poor channel conditions,while the user with poor channel conditions continues to send cooperative jamming signals to interfere with the eavesdropper.Due to the higher power consumption of the user acting as a relay,which may cause the node’s insufficiency,simultaneous wireless information and power transfer(SWIPT) is introduced into this node to form the SWIPT-NOMA system.Additionally,in order to measure the performance of the proposed cooperative NOMA scheme,the expression of the secrecy outage probability of two users is derived and the effectiveness of the scheme is proved by simulation. |
| Key words: non-orthogonal multiple access(NOMA) cooperative interference simultaneous wireless information and power transfer(SWIPT) physical layer security secrecy outage probability |
