Perception method of cooperative spectrum

Abstract

The invention discloses a perception method of cooperative spectrum, which can calculate a high threshold eta 1 and a low threshold eta 0 of a cognition user according to a setting false-alarm probability of the cognition user, then a cognition user i uses the double threshold energy to detect and generate local perception results: a local perception result mi (H0) meaning the absence of the mainuser, a local perception result mi (H1) meaning the presence of the main user, and a local perception result mi (omega) meaning the uncertainty of the absence or the presence of the main user, then the results are sent to a confluent center. The confluent center uses the evidence theory for confluence, and finally obtains the judgment that whether the main user exists or not. The tests indicate that the detection probability of the invention is significantly higher than that of the perception methods of 'or confluence', and 'confluence' and single node. Meanwhile, under the condition of same signal to noise ratio, the miss probability of the invention is significantly lower than that of the perception methods of 'or confluence', 'and confluence' and single node, which is also a reflectionof the advantage of the invention.

Description

technical field [0001] The invention belongs to the technical field of cognitive radio, and more specifically, relates to a cooperative spectrum sensing method in cognitive radio. Background technique [0002] With the continuous increase of radio communication requirements, spectrum resources are in short supply, but the spectrum resources allocated to radio systems are idle to varying degrees in time and space. [0003] The concept of cognitive radio (Cognitive Radio, CR) originated from the groundbreaking work of Dr. Joseph Mitolo in 1999. Its core idea is that CR has the ability to learn and can exchange information with the surrounding environment to perceive and utilize the available spectrum in the space. And limit and reduce the occurrence of conflicts. CR's ability to learn is what really takes it from concept to practical application. [0004] With the development of cognitive radio technology, more and more attention has been paid to cooperative spectrum sensing...

AI Technical Summary

Problems solved by technology

[0013] "And fusion" can greatly reduce the probability of false alarms, but requires each cognitive user to have a 100% detection probability for the main user, otherwise the judgment performance of the fusion center will be greatly reduced, and the degree of protection for the main user will be low ; while "or fusion" guarantees a higher detection probability in the case of cognitive user detection being interfered with, it also brings a higher false alarm probability and reduces the utilization rate of the spectrum

Therefore, "and fusion" and "or fusion" are not optimal cooperative spectrum sensing methods

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