A secure transmission method based on statistical QoS guarantee in cognitive wireless network

Abstract

The invention discloses a secure transmission method based on statistical QoS guarantee in a cognitive wireless network, which uses a statistical delay QoS guarantee framework to guarantee the statistical QoS of a primary user transmitter, and uses a statistical delay-sensitive security transmission scheme for cognitive The user's statistical delay-sensitive security is guaranteed. Statistical queue analysis theory is used to ensure the statistical delay QoS requirements of primary users and the statistical delay-sensitive requirements of cognitive users. The present invention proposes an algorithm for finding the convex hull of any second-order derivable function by using the convex hull and probability transmission theory, then finds the convex hull of the Lagrangian function of the problem through the algorithm, and finally finds the optimal formula with the K.K.T. condition Optimal transmit power, and thus the average maximum throughput of cognitive user transmitters is obtained. The power allocation strategy of the present invention can be dynamically adjusted according to the time delay QoS requirement of the main user transmitter, the statistical security constraint of the cognitive user and the channel condition.

Description

technical field [0001] The invention relates to a physical layer security transmission technology of a cognitive wireless network, in particular to a statistical QoS-based security transmission method in a cognitive wireless network, aiming at effectively alleviating the shortage of spectrum resources and ensuring the security of wireless communication. Background technique [0002] With the rapid and continuous upgrading of wireless communication and the sharp increase in the number of wireless communication terminals, wireless communication technology is facing more and more challenges, the two most important challenges are: 1. Spectrum resources are becoming more and more tight; 2. , Wireless communication security is becoming more and more difficult. These are briefly explained below. Spectrum sharing and cognitive radio technology can effectively alleviate the problem of spectrum resource shortage and are considered to be one of the most important features of future co...

AI Technical Summary

Problems solved by technology

However, using perfect security to evaluate performance has the following disadvantages: first, the rapidly changing wireless environment cannot always ensure that the quality of legitimate channels is better than that of eavesdropping channels, so that the simple combination of reliability and security will be severely degraded system throughput

Second, most of the services of mobile users are time-limited, therefore, the data that is tapped will also expire after a certain period of time

[0004] In summary, we found that the traditional method to guarantee the QoS of the primary user in spectrum sharing is not flexible enough, and the traditional method to evaluate performance indicators in the physical layer security technology is also not flexible enough

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