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Physical layer safety transmission method used for SIMO wireless communication system

A technology of wireless communication system and physical layer security, which is applied in the field of secure transmission of wireless communication systems, can solve the problems that artificial noise technology cannot be directly applied to SIMO system, etc., and achieve the effect of improving physical layer security performance and good security and confidentiality

Active Publication Date: 2014-08-13
XI AN JIAOTONG UNIV
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AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that the artificial noise technology cannot be directly applied to the SIMO system, the present invention proposes a secure transmission method for the SIMO wireless communication system in the time division duplex mode

Method used

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  • Physical layer safety transmission method used for SIMO wireless communication system
  • Physical layer safety transmission method used for SIMO wireless communication system
  • Physical layer safety transmission method used for SIMO wireless communication system

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Embodiment Construction

[0020] refer to figure 1 , the communication system model adopted by the method of the present invention includes: the transmitter Alice, the expected receiver Bob, and the eavesdropper Eve. Alice uses a single antenna. It is expected that the receiver Bob uses M antennas, and the eavesdropper Eve uses N antennas. The number of antennas satisfies M≥2 and M>N. Denote the channel from Alice to Bob as an M-dimensional column vector h AB , the channel from Bob to Alice is an M-dimensional row vector h BA , the channel from Alice to Eve is an N-dimensional column vector h AE , the channel from Bob to Eve is an N×M dimensional matrix H BE . When the channel changes slowly and adopts time-division duplex mode, the channel between Alice and Bob satisfies reciprocity, that is When Alice initiates communication, she first sends request information, and the information also includes pilot signals for channel estimation. Bob estimates h from the pilot signal AB , and construct an ...

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Abstract

The invention discloses a physical layer safety transmission method used for an SIMO wireless communication system. Firstly, a receiving expecting party emits a random reference signal reversely, an emitting party scrambles and transmits symbols to be transmitted through the received reference signal, and finally the receiving expecting party demodulates the received signal through the known reference signal to obtain information transmitted by the emitting party. In the first step, the multi-antenna receiving party sends not only the reference signal, but also an artificial noise signal, the space where the artificial noise signal is located is in quadrature with a main channel vector, so that the artificial noise has no influence on receiving the reference signal of the emitting expecting party. For an eavesdropper, due to different channels, eavesdropping is interfered with by artificial noise signals, the random reference signal is difficult to evaluate accurately, the probability of successfully eavesdropping encrypted signals is greatly reduced, and safety transmission of the SIMO wireless communication system is guaranteed finally.

Description

technical field [0001] The invention relates to a safe transmission method of a wireless communication system, in particular to a safe transmission method for a single-input multiple-output (SIMO) wireless communication system in a time-division duplex mode. Background technique [0002] The development of wireless communication technology eliminates the constraints of traditional wired access requiring cables as the medium, which greatly facilitates human life and promotes social development. Different from wired communication, the broadcast nature of wireless communication electromagnetic signals makes it easy for any receiver within the coverage area to receive the signal transmitted by the transmitter, which means that other users other than the desired user may also obtain communication information. As far as confidential communication is concerned, wireless communication systems have greater security risks than traditional wired communication systems. With the increas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04K1/06H04B7/08
Inventor 穆鹏程王勃杨培志
Owner XI AN JIAOTONG UNIV
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