Physical layer secure transmission method using spatial modulation technology

Abstract

The invention discloses a physical layer secure transmission method using the spatial modulation technology. It is assumed that a sender can obtain channel state information of a legal user and an illegal user, the sender obtains an index number and a to-be-sent symbol of a receiving antenna according to to-be-transmitted bit data by using the pre-encoding assisted generalized orthogonal spatial modulation technology, obtains a zero-forcing pre-encoding matrix by using the channel state information between the sender and the legal user, adds artificial noise to a zero space of a channel between the sender and the legal user, and finally figures out the optimal power allocation through the maximum secrecy capacity; and the legal user can smoothly decode the information sent by the sender through the channel state information between the sender and the legal user, and the eavesdropping user is interfered by the artificial noise and cannot correct decoding the information, thereby realizing the security of a physical layer. By adoption of the physical layer secure transmission method disclosed by the invention, higher security capacity can be stably obtained under the same signal-to-noise ratio.

Description

【Technical field】 [0001] The invention belongs to the communication field, and relates to a physical layer security transmission method using space modulation technology. 【Background technique】 [0002] In recent years, the continuous development of wireless communication technology has enabled people to access communication networks anytime and anywhere. However, the broadcast nature of wireless communication means that all nodes within the transmission range can receive the signal sent by the source, and the information of legitimate users is easily obtained by eavesdropping users. Therefore, it is particularly important to ensure the secure transmission of wireless communication [1]. Compared with traditional encryption methods, physical layer security aims to use the physical layer characteristics of wireless communication, such as noise, fading, etc., to ensure the security of wireless communication based on the theory of information theory. [0003] In 1975, Wyner de...

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Problems solved by technology

[0004] However, there is still very little research on physical layer security in the direction of spatial modulation [8]. At present, no one has conducted research and discussion on the physical layer security transmission method using precoding-assisted orthogonal spatial modulation technology.

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