Method for obtaining detection performance parameter of cognitive radio frequency spectrum perception system in moving scene

Abstract

A method for obtaining a detection performance parameter of a cognitive radio frequency spectrum perception system in a moving scene relates to the field of information and communication technology. The method aims to settle a problem of high difficulty in performing testing for detection probability, miss probability and false alarm probability on single-node perception system and a multi-node cooperative perception system according to an existing method. Firstly, a movement speed, a movement direction, a distance between a starting point and a main user, and a function relationship between a cognitive user and a main user are obtained according to a network model of the system and a movement model of the cognitive user; and furthermore a probability density function (PDF) between the current main user and the cognitive user is solved. The PDF of a main user signal power which is detected by a mobile user in real time is calculated through the function relationship between the main user signal power and the distance between the starting point and the main user according to the PDF between the distance between the cognitive user and the main user. Finally, the detection probability, the miss probability and the false alarm probability of the single-node perception system, a multi-node hard-decision cooperative perception system and a multi-node soft-decision cooperative perception system are obtained by means of the PDF of the power and a probability theory.

Description

technical field [0001] The invention relates to the technical field of information and communication. Background technique [0002] In recent years, the rapid development of wireless communication technology has led to a sharp increase in the demand for wireless spectrum resources. However, the current fixed spectrum allocation policy makes most of the frequency bands not fully utilized. In order to improve spectrum utilization, researchers have proposed cognitive radio (CR) technology. CR is to allow the wireless communication equipment with radio environment awareness function to dynamically access the authorized frequency band of the main user without affecting the authorized frequency band of the main user signal, that is, the frequency band fixedly allocated to the user, and to communicate normally, so as to complete the allocation of spectrum resources. shared. In this process, spectrum sensing is a key technology to ensure the normal communication of primary user s...

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the existing methods are difficult to detect the detection probability, missed detection probability and false alarm probability of the single-node sensing and multi-node cooperative sensing systems in the mobile scene, so as to propose a cognitive radio spectrum sensing system detection in the mobile scene How to obtain performance parameters

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