Multi-channel collaborative spectrum sensing method based on iterative filtering

Abstract

The invention discloses a multi-channel collaborative spectrum sensing method based on iterative filtering. The method includes: time is divided into time slices with fixed length through a reasonably designed frame structure. In each time slice, a secondary user with poor sensing performance is removed preferentially and does not participate in next round of cooperative spectrum sensing, and therefore the number of sensing users is reduced remarkably, and spectrum sensing performance is improved. Through design of the frame structure and a collaborative sensing scheme, the multi-channel collaborative spectrum sensing method based on the iterative filtering can solve problems of too much collaborative spectrum sensing users and malicious user interference existing in a distributed cognitive radio network. Theory analysis and simulation results show that: compared with an existing collaborative spectrum sensing method, the multi-channel collaborative spectrum sensing method based on the iterative filtering can effectively reduce the number of the secondary users participating in collaborative sensing in a loose condition, malicious interference users are removed, and simultaneously spectrum sensing performance of the cognitive radio network is improved.

Description

Technical field: [0001] The invention belongs to the technical field of cognitive wireless networks, and relates to a multi-channel cooperative spectrum sensing method based on iterative screening. Background technique: [0002] In the past two decades, with the rapid development of wireless communication technology, wireless devices and services have increased significantly, resulting in increasingly scarce available spectrum resources. However, in some broadcast TV bands, the utilization rate of spectrum resources is very low. In order to alleviate the contradiction between the relative scarcity and absolute waste of spectrum resources and improve the utilization of spectrum resources, Dr. Mitola proposed the concept of Cognitive Radio (CR) in 1999. In a cognitive radio network, secondary users (Secondary Users, SUs) can dynamically and opportunistically use the spectrum resources of primary users to communicate without causing interference to primary users (PU), thereby ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems of excessive number of users participating in sensing and poor spectrum detection performance of the cognitive network in multi-channel cooperative spectrum sensing; to propose a multi-channel cooperative spectrum sensing method based on iterative screening, which The method can effectively reduce the number of users participating in cooperative sensing under a relaxed condition, eliminate malicious interference users, and improve the spectrum sensing performance of the system at the same time

Images