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Spectrum sensing method based on polarizability

A technology of spectrum sensing and polarization degree, applied in the field of spectrum sensing of cognitive radio, it can solve the problem of loss of signal inherent information utilization, and achieve the solution of overcoming noise uncertainty, reducing time required, and reducing computational complexity. Effect

Active Publication Date: 2014-02-19
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, traditional spectrum sensing methods are based on the analysis of the amplitude, phase or frequency information of the received signal, but the polarization information that can also reflect the essential properties of the signal has not been applied, which has caused a great loss in the use of the inherent information of the signal

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  • Spectrum sensing method based on polarizability
  • Spectrum sensing method based on polarizability
  • Spectrum sensing method based on polarizability

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Embodiment

[0028] see figure 2 , an embodiment of the present invention provides a polarization-based spectrum sensing method, including:

[0029] Arriving signal 100: the analog signal arriving at the receiving end of the CR is denoted as x(t).

[0030] Orthogonal dual-polarization antennas receive signals 200: CR user receiving end uses orthogonal dual-polarization antennas to obtain all polarization information of arriving signals (x H , x V );

[0031] Spectrum sensing 300: performing spectrum sensing on received signals to verify whether authorized user signals exist;

[0032] It should be noted that the technical solutions proposed in the embodiments of the present invention are applicable to various local physical layer detection algorithms, cooperative spectrum sensing algorithms, and cross-layer spectrum sensing algorithms; they are especially suitable for dual-polarized antenna receiving scenarios.

[0033] Judging whether the authorized user signal appears 400: Make a jud...

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Abstract

The invention provides a spectrum sensing method based on polarizability, which is suitable for cognitive radio networks. The method comprises the following steps of: setting a system detection threshold, continuously sampling space electromagnetic signals, estimating a covariance matrix of the received signals, obtaining the polarizability of the received signals based on a characteristic value of the covariance matrix, thereby, judging existence of electromagnetic signals according to the polarizability difference between signals and noises. The method can realize application of polarization information of electromagnetic signals of authorized users, and effectively solves the problem of indeterminacy of noise in practice; the polarizability is obtained based on a sampling covariance matrix of the received signals, and detection can be performed without using the prior knowledge of signals, channels or noises; the method is suitable for small sample detection, and can reduce computational complexity, improve detection speed of the system to the electromagnetic signals and reduce detection time of the system to the electromagnetic signals. Thus, the method can meet the requirement on real-time detection, and is beneficial for efficient usage of limited radio spectrum resource.

Description

technical field [0001] The invention belongs to the field of wireless communication, in particular to a spectrum sensing method of cognitive radio. Background technique [0002] With the development of wireless communication technology, people's demand for wireless spectrum resources is increasing day by day. However, wireless spectrum is a non-renewable precious resource. It is an urgent problem to be solved in the field of wireless communication to make full use of spectrum resources and improve spectrum utilization to meet the growing wireless communication services. Cognitive radio (CR, Cognitive radio) technology, as an intelligent spectrum sharing technology, can effectively solve the contradiction between the scarcity of spectrum resources and the ever-increasing traffic volume. In the CR system, unlicensed users with cognitive functions (CR users) need to quickly and accurately perceive the unoccupied licensed user frequency bands, and realize dynamic spectrum acce...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/00H04B17/382
Inventor 郭彩丽林琳冯春燕曾志民吴晓彬
Owner BEIJING UNIV OF POSTS & TELECOMM
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