Dynamic grouping cooperation spectrum detection method based on bandwidth limitation

Abstract

The invention discloses a dynamic grouping cooperation spectrum detection method based on bandwidth limitation, belonging to the technical field of cognitive radio of wireless communication. A cognitive radio system comprises an authorized user, a detection channel, cognitive users, an inter-cognitive user channel, a feedback channel and a base station. The method comprises the following steps: firstly, the cognitive users are dynamically grouped according to the state information of the inter-user channel; two thresholds are set to only allow the cognitive user with high detection credibility to transmit a detection result to a cluster head; the cluster head transmits a fusion judgment result to the base station through a cooperative mode; and finally, the base station makes the final result decision. In the case of limited bandwidth, the method disclosed by the invention can remarkably reduce the information transmission overhead by losing some negligible system detection performance. At a grouping link, dynamic grouping can be realized by comparing the bit error rate of the channel during direct transmission by the cognitive user and during forwarding transmission of the detection result by the cluster head, and the system performance is obviously improved by the dynamic grouping in comparison with the grouping by a fixed user.

Description

technical field [0001] The invention relates to a cooperative spectrum detection method based on dynamic grouping with limited bandwidth, and belongs to the technical field of wireless communication cognitive radio. Background technique [0002] With the advancement of science and technology and the rapid development of wireless communication technology, wireless spectrum resources are becoming increasingly tight. Due to the fixed spectrum allocation policies of various countries, unlicensed spectrum resources are becoming less and less. With the rapid development of wireless communication services such as WLAN and WPAN, unlicensed frequency bands have gradually become saturated. At the same time, related studies have shown that the utilization rate of a large number of spectrum resources is very low. Therefore, a communication technology is urgently needed to solve the contradiction between the limited available spectrum resources and the low utilization rate of spectrum re...

AI Technical Summary

Problems solved by technology

[0005]Most of the existing group-based cooperative spectrum detection methods are fixed-user grouping methods based on user distance. Such grouping methods do not consider the channel state conditions between group users , the detection performance of the system is difficult to achieve optimal

Zhang Wei proposed a cooperative spectrum detection technology based on STBC in the paper "Cooperative spectrum sensing with transmit and relay diversity in cognitive radio networks", and then some researchers proposed a dynamic group cooperative spectrum sensing based on STBC technology, this scheme can achieve good system detection performance, but because the control bandwidth of the system is generally limited, and the system overhead of this scheme is very large, thus limiting the application of this scheme

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