A Relay Selection Method Applied to Cognitive Hybrid Duplex Networks

Abstract

The present invention claims a relay selection method applied to a cognitive hybrid duplex network, including the steps of: establishing a relay selection model in a cognitive relay network, and under the condition that cognitive users can complete communication, to minimize Cognitive user's interference to the primary user is the goal, and the minimum interference optimization model is established to make the model description more accurate, and the exhaustive method is used to solve the problem, and then the relay node that causes the least interference to the primary user is selected, so that the primary user spectrum After accessing the cognitive users, on the premise of ensuring that the cognitive users meet certain performance requirements, the main users are allowed to tolerate less interference, thereby improving the performance of the main users.

Description

technical field [0001] The invention belongs to the technical field of mobile wireless communication, in particular to a relay selection mechanism in a cognitive hybrid duplex network. Background technique [0002] Cognitive radio technology allows primary users and cognitive users to coexist, and full-duplex relay technology can realize signal reception and transmission at the same time and frequency. Both technologies are mainstream technologies for improving spectrum utilization in the network in the future. , under normal circumstances, each cognitive user is a potential relay node, with the rapid development of mobile devices, the number of optional relay nodes is very large, so the cognitive relay network under the The research on the relay selection method is very meaningful. The cognitive relay network architecture is as follows: figure 1 shown. In the Underlay mode cognitive relay network, some relay selection methods such as optimal cognitive user capacity relay ...

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Problems solved by technology

[0003] It can be seen from the above technologies that the existing cognitive relay technology model lacks the description of the interference caused by the cognitive user to the primary user, so it is not accurate enough. They all follow a principle: as long as the interference temperature is limited, the cognitive network It is possible to increase the capacity (or reduce the outage probability) as much as possible through the relay selection scheme, resulting in a larger transmit power of the node, which in turn causes greater interference to the primary user

In fact, even if the cognitive users can meet the strict interference temperature limit, the primary user network has to sacrifice its own (performance or power) to tolerate higher interference

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