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Local maximum efficacy invariance test spectrum sensing method based on non-circular signal

A local maximum, non-circular signal technology, applied in the field of communication, can solve the problem of estimation error affecting detection performance, etc., and achieve the effect of excellent detection performance and low signal-to-noise ratio

Active Publication Date: 2016-01-27
XIDIAN UNIV
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Problems solved by technology

However, since GLRT detection needs to use the maximum likelihood estimation of unknown parameters to calculate the likelihood ratio to construct the test statistic, the estimation error will greatly affect its detection performance when the number of sampling points is small and the channel environment is poor

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  • Local maximum efficacy invariance test spectrum sensing method based on non-circular signal
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  • Local maximum efficacy invariance test spectrum sensing method based on non-circular signal

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Embodiment Construction

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0034] An embodiment of the present invention provides a method for configuring shared virtual resources in a baseband pool. In this embodiment, for a MIMO spectrum sensing system composed of a single primary user and a single cognitive user, the number of antennas configured at the transmitting end of the primary user is M , and the number of antennas configured at the receiving end of the cognitive user is N.

[0035] It includes the following steps:

[0036] S1. Calculate the sampling covariance matrix according to the received signal of the receiving end of the cognitive user, and construct a corresponding augmented sampling covariance matrix;

[0037] For the received signal at the receiving end of the cognitive user at the kth sampling moment, the following form is satisfied,

[0038] ...

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Abstract

The invention discloses a local maximum efficacy invariance test spectrum sensing method based on a non-circular signal in a multi-antenna scenario. The method comprises the steps as follows: A, calculating a sampling covariance matrix according to a received signal of the receiving end of a cognitive user, and constructing a corresponding augmented sampling covariance matrix; B, calculating the F norm of the augmented sampling covariance matrix, and constructing the test statistical magnitude; C comparing the test statistical magnitude with a preset threshold, judging that the spectrum is occupied if the statistical magnitude is greater than the threshold, or judging that the spectrum is idle, thus completing detection. By means of the characteristics of the non-circular signal, the correlation structure of the signal is utilized fully. In a multi-antenna scenario, high detection accuracy can be guaranteed, the number of required sampling points is small, and the detection efficiency is high.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method for detecting frequency spectrum sensing based on local maximum power invariance of non-circular signals. Background technique [0002] As a very important link in the cognitive radio network, spectrum sensing technology has been widely concerned by scholars at home and abroad. Through spectrum sensing technology, cognitive users can find spectrum holes without interfering with primary users, thereby utilizing unoccupied spectrum resources and greatly improving spectrum utilization. However, there are often false alarms and missed detections in the sensing process. The occurrence of false alarms will lead to a decrease in spectrum utilization, and the occurrence of missed detections will cause interference to the primary user. On the other hand, since the access situation of the primary user changes at any time, it is necessary to ensure that the sensing is compl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/382
Inventor 李兵兵贾琼刘明骞
Owner XIDIAN UNIV
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