一种基于NOMA的多播无线隐蔽信道

A Multicast Wireless Covert Channel Based on NOMA

随着移动互联网技术的飞速发展,大量的无线通信场景已经成为无线隐蔽信道的重要载体。当无线隐蔽信道需要在有限的时频资源与多个接收方实现通信时,多播无线隐蔽信道较现有的单播方法具有明显优势。提出一种基于非正交多址接入技术(NOMA)的多播无线隐蔽信道。信道中,发送方将多方秘密信息调制成人工噪声并叠加在正常信号上传输。各接收方通过差分解调去除其它人工噪声的干扰,得到对应的秘密信息。实验结果表明,所提多播无线隐蔽信道,相较传统单播无线隐蔽信道,在保持相同的抗检测性的同时,有效地提高了可靠性。

With the rapid development of mobile internet technology, massive scenarios of wireless communication have become an important carrier of wireless covert channels. When a wireless covert channel is needed to communicate with multiple receivers with limited time-frequency resources, the multicast wireless covert channel has significant advantages over the existing unicast methods. This paper proposed a multicast wireless covert channel based on Non-Orthogonal Multiple Access(NOMA). In this channel, the sender modulated the multi-party secret messages into artificial noise and superimposed it on the normal signal for transmission. Each receiver removed the interference of other artificial noise through differential demodulation and obtained corresponding secret messages. The experimental results show that the proposed multicast wireless covert channel in this paper can effectively improve the reliability while maintaining the same undetectability compared with the traditional unicast wireless covert channel.