Mixed duplex transmission method for improving physical layer security in cognitive relay network

Abstract

The invention discloses a mixed duplex transmission method for improving physical layer security in a cognitive relay network. The mixed duplex transmission method comprises the steps of, by a pair of unauthorized users, sharing a frequency band resource with an authorized user in the cognitive relay network with an illegal eavesdropper under the assistance of a cooperative relay and under the interference limitation to a main user; and by the relay, playing a role of confusing the illegal eavesdropper through adding man-made noise while assisting to decode and forward information. One relay transmission frame is divided into two equal time slots during half-duplex transmission. The relay transmission frame is not subjected to time slot division during the full-duplex transmission. When the full-duplex self-interference power is lower than a threshold value, the full-duplex transmission is adopted; otherwise, the half-duplex transmission is adopted. Switching between the half-duplex transmission and full-duplex transmission is realized based on the full-duplex self-interference power, respective advantages of the half-duplex mode and the full-duplex mode are utilized, and the physical layer security of the cognitive relay network is finally improved by increasing the total transmission capacity of the cognitive relay network.

Description

technical field [0001] The invention relates to the fields of cognitive radio technology and information security technology, in particular to a hybrid duplex transmission method for improving physical layer security in a cognitive relay network. Background technique [0002] Nowadays, as the traffic volume of wireless mobile communication is increasing rapidly, how to effectively improve the utilization rate of spectrum resources and ensure the reliability of information transmission becomes more and more important. With the continuous development of cognitive radio technology, secondary users can transmit their own information on the licensed frequency band as long as the interference to the licensed user is within the range that the primary user can tolerate when accessing the licensed frequency band, which greatly improves wireless communication. Spectrum utilization avoids the waste of spectrum resources. This concept has become an important way to solve problems such a...

AI Technical Summary

Problems solved by technology

Studies have shown that in theory, the transmission capacity of full-duplex can be doubled compared with half-duplex, but in fact self-interference cannot be completely eliminated, and the transmission capacity cannot reach the theoretical maximum value.

[0006] At present, half-duplex and full-duplex cooperative relays have been extensively studied on the physical layer security issues in cognitive relay networks, and their respective superiority has been proved under certain conditions, but few people have considered the The advantages of the two duplex modes are combined to improve the security and confidentiality of the physical layer.

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