Method for cooperative spectrum sensing optimization based on signal to noise ratio screening

Abstract

The invention discloses a method for cooperative spectrum sensing optimization based on signal to noise ratio screening. The problem that part of cognitive nodes located in the severe environment affect the overall sensing performance when cooperative spectrum sensing is actually applied can be effectively solved. The method comprises the steps that local signal to noise ratios of the cognitive nodes are measured, judgment results and a real-time signal to noise ratio condition are reported to a data fusion center, a signal to noise ratio threshold value is set by the data fusion center according to the whole signal to noise ratio condition of a system, the signal to noise ratios of the cognitive nodes are compared and screened, the judgment results satisfy the requirement of a condition cognitive node will participate in overall cooperation, and a cooperation judgment result is an overall judgment result. When the signal to noise ratio threshold value is set and the signal to noise ratios are screened and compared, the value of an adjustment factor can be dynamically changed, the screening dimension is controlled, and therefore the system performance is optimized. The method is quite low in computation complexity, only simple comparison and screening operation is needed, computation is completed at the side of the data fusion center, and the method is simple and easy to conduct.

Description

technical field [0001] The invention relates to the technical field of computer wireless communication, in particular to a collaborative spectrum sensing optimization method based on SNR screening. Background technique [0002] With the emergence of various computer wireless communication applications, the problem of scarcity of spectrum resources has become more and more serious, and cognitive radio is considered to be the best technology to solve this problem. Cognitive users, as the second user, are allowed to access the spectrum when the authorized users are not using the licensed spectrum, but cannot affect the authorized users. Once the authorized users appear, the cognitive users must immediately give up the spectrum and look for new ones. In the idle spectrum, cognitive users need continuous, reliable and fast spectrum sensing capability, so the spectrum sensing method has become one of the key technologies of cognitive radio. There are three commonly used spectrum ...

AI Technical Summary

Problems solved by technology

In the actual environment, when all cognitive nodes participate in cooperative sensing, often many nodes are in a relatively severe environment, due to fading, shadow effects, etc., the signal-to-noise ratio of some cognitive nodes drops sharply

When there are multiple nodes with low SNR participating in cooperative sensing, the performance of cooperative sensing becomes close to or even lower than that of a single node

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