Abstract
In the downlink scenario of satellite-earth integrated networks, the secondary systems ought to share spectrum resources with no extra interference on the primary system under the premise of interference constraints. However, due to various factors, e.g., equipment failure or selfish drive, interference constraint violation (ICV) exists, which seriously threatens the reliable communication of primary systems. Therefore, effective detection of the secondary users’ working status is necessary to protect the communication of primary user. In this paper, a new geolocation spectrum database is introduced to coordinate the information interaction for spectrum usage and surveillance, and a detection framework is proposed to detect the ICV behaviors, which utilizes the generalized likelihood ratio test and maximum a posterior to determine the transmitted power of the secondary users. Moreover, a data fusion scheme based on sensing node selection is designed to alleviate negative effects on the detection performance brought by the existence of the primary user. Furthermore, the test statistics are derived under different channel models. Finally, extensive simulations are provided to verify the proposed framework under various parameter configurations.
Highlights
IntroductionTo enhance the spectrum efficiency of the satelliteearth integrated networks, more refined space-time spectrum sharing strategies based on spectrum heterogeneous characteristics of space and time can be designed, i.e., ground
In the space-time spectrum sharing strategy considered in this paper, the signalto-noise ratio at the edge of the communication area of the primary user, i.e., DP = 1750m, is −4dB
We propose a new geolocation spectrum database framework for tasks definition in the spectrum sharing and formulate a generalized model for spectrum sharing in the satellite-earth integrated networks
Summary
To enhance the spectrum efficiency of the satelliteearth integrated networks, more refined space-time spectrum sharing strategies based on spectrum heterogeneous characteristics of space and time can be designed, i.e., ground. In the communication area of the primary user, the secondary users should choose to access the channel only when the primary user is absent, so that there will be no interference to the communication of the primary user. While outside the communication area of the primary user, the secondary users can access channel when the primary user is active, but the behavior of secondary user can produce interference to the satellite earth station, especially the closer the secondary user is to the satellite earth station, the stronger the interference will be. In order to achieve reliable communication, it is necessary to control the transmitted power of the secondary user to ensure that the interference to the primary user’s communication is within a certain range
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