Cooperative OFDMA system power control method under physical layer security constraints

Abstract

The invention discloses a synergy OFDMA (Orthogonal Frequency Division Multiple Access) system power control method under physical layer security constraint, and mainly solves the problem of poor security of a synergy OFDMA system relay node. The method comprises the steps: a user selects a direct transmission mode or a synergy amplification forwarding mode for transmission according to channel conditions; a corresponding utility function is designed, the utility function is used for ensuring that the security capacity of the transmission channel of the user is greater than 0, and a cost mechanism is introduced for saving resources; if the direct transmission mode is selected, a sending rate-based utility function is used for carrying out control on subcarrier power; if the synergy mode is selected, a relay which is synergetic with the channel is further selected according to the channel conditions, a utility function based on the equivalent signal-to-noise ratio difference of a synergy channel and a wiretap channel is used for carrying out distribution of the subcarrier power. According to the power control method, the optimized configuration of the security rate and sending power of the user node are calculated, the security is improved, the sending power is saved, the calculation complexity is reduced, and the method can be applied to a synergy OFDMA communication system.

Description

technical field [0001] The invention belongs to the technical field of communication, and relates to a power control method of a cooperative orthogonal frequency division multiple access (OFDMA) system under physical layer security constraints, which can be used in a communication environment where the channel security of a relay node cannot be guaranteed. Background technique [0002] With the rapid development of mobile communication, on the one hand, communication services tend to be broadband, high-speed, and diversified; on the other hand, user nodes have continuously improved requirements for the quality of wireless communication services. In order to effectively support diversified broadband high-speed services with different QoS requirements, and in view of the essential characteristics of wireless communication networks such as dynamics and wireless resource scarcity, people have proposed orthogonal frequency division multiplexing OFDM and cooperative communication f...

AI Technical Summary

Problems solved by technology

However, traditional resource allocation algorithms rarely consider the system's requirements for physical layer security, let alone the problem of relay node eavesdropping, and cannot guarantee the security of user information.

Images