Artificial noise-based cooperative network power allocation method for main channel and cooperative channel under non ideal channel estimation condition

Abstract

The invention discloses an artificial noise-based cooperative network power allocation method for a main channel and a cooperative channel under a non ideal channel estimation condition. After a transmitting end uses legal communication main channel information obtained in a non ideal channel estimation method, a transmitting signal is designed, power allocation between a useful signal and an artificial noise signal is carried out, on the basis of ensuring the security performance, and useful secrecy messages are transmitted to a legal receiver as much as possible. In addition, in order to improve the security of the secrecy messages, a cooperative jammer (CJ) is added, the CJ uses cooperative channel information obtained in the non ideal channel estimation method to design a transmitting signal to jam an eavesdropping node Eva. Under the condition of only knowing the statistical channel information of an eavesdropping channel at the transmitting end, the system security transmission rate is maximized through optimizing power allocation for the transmitting signal at the transmitting end, and the most effective security transmission of the secrecy messages in the cooperative network is realized.

Description

Technical field [0001] The invention belongs to the field of information technology security, and particularly relates to a method for power allocation in a cooperative network based on artificial noise under the condition of non-ideal channel estimation of a main channel and a cooperative channel. Background technique [0002] With the development of wireless communication technology, information security technology based on physical layer resources has become a research hotspot in the two fields of wireless communication and information security. The diversity of physical layer resources of wireless communication systems provides a broad space for the research of physical layer security technology, and also leaves many problems to be solved urgently. In the past 10 years, the physical layer technology in wireless communication has developed vigorously, and new technologies have emerged one after another. Therefore, how to fully develop the uniqueness and confidentiality of phys...

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Problems solved by technology

However, current secure transmission designs are mainly based on the assumption that an ideal channel estimate with channel state information is available

However, in practical applications, this assumption is obviously unreasonable

[0005] In the case where both the main channel and the cooperative channel are non-ideal channel estimates, there must be errors between the estimated channel and the actual channel, so the artificial noise vector designed by the transmitting source based on the estimated channel state information and the cooperative jammer designed based on the estimated channel state information The interference signal will inevitably affect the legitimate receiver and reduce the signal-to-interference-noise ratio of the legitimate receiver

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