Realization method for mixed network structure in cognitive radio

Abstract

The invention relates to a method for realizing mixed network structure, belonging to the wireless communication technique, especially the frequency spectrum application of cognitive radio system and the realization of physical transmission medium of cognitive radio mixed network structure, wherein it comprises: based on the interfere temperature model, calculating the allowed maximum receiving power of receiver at said time, calculating the real emission power of sending terminal, calculating the combination of two effective frequency spectrums, and realizing the point-to-multipoint (PMP) and mesh topology in mixed structure. The inventive classified spectrum share method can realize the mixed structure that supporting the point-to-multipoint (PMP) and mesh topology, to increase the system capacity and expand the area cover range.

Description

technical field [0001] A method for realizing a hybrid network structure in cognitive radio belongs to the field of wireless communication technology, and in particular relates to a spectrum usage mode of a cognitive radio (Cognitive Radio) system, and the realization of a physical transmission medium of a cognitive radio hybrid network structure. Background technique [0002] Cognitive radio system is an intelligent wireless communication system, which can perceive and learn the surrounding environment, and adjust its own communication parameters (such as modulation mode, communication frequency band, etc.) to adapt to changes in the surrounding environment. At present, cognitive radio is mainly used to solve the shortage of spectrum resources in wireless communication. Using the intelligent perception capability of cognitive radio, unlicensed users can use the spectrum resources originally allocated to licensed users without causing interference to licensed users when lice...

AI Technical Summary

Problems solved by technology

This structure has the following disadvantages: First, due to the large coverage, the CR-SAP and CR-BS covering the cell edge are far away, and the power level to be transmitted is also required to be relatively high, which makes it easier to exceed the interference temperature limit , so the number of frequency bands available for CR-SAP and CR-BS direct communication is small

Second, due to the wide coverage area, some overlapping areas with the authorized system may appear in the coverage area of ​​the CR-BS. When the authorized system communicates, these areas will become the communication blind area of ​​the CR system, and because the CR system It is impossible to predict the time and place of the emergence of the authorization system, and the emergence of communication blind spots will be random and variable, thus making the coverage of CR cells variable and irregular, and the continuity of communication in the cells may be destroyed

Third, the point-to-multipoint large-area coverage network is limited in transmission rate due to long-distance transmission, which cannot meet the requirements of high-speed service transmission. In fact, not all services must be connected and forwarded by CR-BS, such as coverage This is not necessary for local business in the region

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