Spectrum sensing method based on cyclostationarity upon random occurrence of master user signal

Abstract

The invention relates to a spectrum sensing method based on cyclostationarity upon random occurrence of a master user signal. The method comprises the steps of segmenting spectrum sensing time of a cognitive user according to the reciprocal of master user signal cycle frequency; for each segment, building a transversal vector, composed of a plurality of cyclic autocorrelation functions, namely a cyclic autocorrelation function vector; computing estimation of a covariance matrix of the cyclic autocorrelation function vectors of all segments, and computing a corresponding judgment statistics; computing a corresponding judgment threshold according to preset false alarm probability; comparing the judgment statistics with the judgment threshold; when the judgment statistics is larger than the judgment threshold, judging that a current frequency band has the master user signal which appears randomly during a perception process; and otherwise, judging that the current frequency band does not have the master user signal.

Description

technical field [0001] The invention relates to a frequency spectrum sensing method based on cyclostationarity when primary user signals appear randomly. Background technique [0002] 1. Cognitive radio [0003] With the rapid development of wireless communication, various services that need to be applied to high-speed wireless communication technology are also increasing. But the radio frequency spectrum resource is a kind of natural resource, this kind of resource is non-renewable. The traditional spectrum allocation mode is fixed allocation, that is, a certain frequency band is allocated to a specific service. This allocation mode often leads to some frequency bands being overcrowded and other frequency bands are almost unused. This results in low utilization of radio frequency spectrum resources. [0004] Cognitive radio, as a dynamic spectrum allocation scheme, its core idea is to divide the users in the system into two categories: primary users and authorized users....

AI Technical Summary

Problems solved by technology

Therefore, if the spectrum sensing results are inaccurate and missed detection occurs, it will cause interference to the primary user, which will cause obstacles to the application of cognitive radio technology, and even reduce people's social recognition of cognitive radio technology in severe cases. Therefore, Research on spectrum sensing technology is of great significance in cognitive radio

[0007] 3. The main user signal appears randomly

Such sudden appearances cause major problems for existing spectrum sensing methods, so there must be suitable methods to deal with this problem

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