Secure transmission method based on statistic QoS guarantee in cognitive wireless network

Abstract

The invention discloses a secure transmission method based on statistic QoS guarantee in cognitive wireless network. The statistic time delay QoS guarantee frame is used to ensure the statistic QoS of a main user transmitter, and the statistic time delay sensitive secure transmission scheme is used to ensure the statistic time delay sensitive security of the cognitive user. The guarantee of the statistic time delay QoS requirements of the main user and the statistic time delay sensitive requirements of the cognitive user is performed based on the statistic queue analysis theory. The invention brings forward an algorithm of solving the convex hull of any second order derivative function by means of the convex hull and the probability transfer theory, and then finds the convex hull of the Lagrangian function of the problem by the algorithm, and uses the K. K. T. Condition to find the optimal transmit power, resulting in the average maximum throughput of the cognitive user transmitter. The power distribution strategy can perform dynamic adjustment according to the time delay QoS requirements of the main user emitter, the statistic 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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