Selection method of cognitive network path

Abstract

The invention discloses a selection method of a cognitive network path. The method comprises the following steps: a secondary user source node, a secondary user relay node and a secondary user destination node respectively obtaining various parameters required for analyzing outageperformance of the cognitive network under mutual interference scene of a primary userand a secondary user, establishing an outage probability closed form expression of any one path in a cognitive relay network under a Rayleigh fading channel in combination withinterference limitation allowed by a primary user receiver end, selecting an optimal path of information transmission from a source node to the destination node in the network according to the optimal criterion of system end-to-end outage performance, and selecting a network path by using minimum standard of the cognitive network outage probability. The technical scheme disclosed by the invention gives full consideration to interference factors of the primary user to the secondary user in the cognitive network path selection and takes corresponding measures so as to improve the reasonability of timely selecting the cognitive network path.

Description

technical field [0001] The present invention relates to the technical field of cognitive radio and cognitive network, in particular to a method for selecting a cognitive network path. Background technique [0002] Cognitive radio technology is an effective method to improve the efficiency of spectrum utilization. It allows secondary users (SUs) to use the licensed spectrum of PUs without affecting the normal communication of primary users (PUs). In the cognitive network, there are three methods for PUs and SUs to share spectrum: underlay, overlay, and interweave. Among them, the underlay method has attracted more and more attention. The basic idea is that as long as the SUs transmitter does not interfere with the PUs receiver beyond the allow The maximum interference threshold, SUs can use the licensed spectrum of PUs to complete the communication. Therefore, in order not to cause harmful interference to the PUs receiver, the transmit power of the SUs transmitter should be ...

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Problems solved by technology

[0009] The above studies only considered the interference of SUs transmitters to PUs receivers or the interference of PUs transmitters to SUs receivers, but did not fully consider the mutual interference between PUs and SUs. This analysis of cognitive relay network outage performance The method is not comprehensive; according to the mutual interference between PUs and SUs, the method of analyzing the outage probability of the cognitive relay network and selecting the network path according to the outage probability has not been studied.

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