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A Spectrum Sensing Method for Multiple Antennas

A spectrum sensing and multi-antenna technology, applied in the field of multi-antenna spectrum sensing, can solve the problems of poor detection performance and achieve the effect of improved detection performance and low complexity

Active Publication Date: 2020-09-29
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

WCD and ALV methods can get high detection performance when the receiving antennas are highly correlated; but the detection performance is poor when the receiving antennas are low

Method used

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  • A Spectrum Sensing Method for Multiple Antennas
  • A Spectrum Sensing Method for Multiple Antennas
  • A Spectrum Sensing Method for Multiple Antennas

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Embodiment Construction

[0025] The content of the invention has described the technical solution of the present invention in detail, and the effect of the technical solution of the present invention is described below in conjunction with the accompanying drawings:

[0026] In the following example, we consider the effect of noise variance uncertainty on the considered detector. actual noise variance in is the nominal noise variance, η is a parameter to measure the uncertainty level of the noise variance, usually used express. In addition, the "worst" case is used to describe the noise variance uncertainty, that is, at H 0 case, in H 1 case, The primary user signal s(n) is QPSK modulated, and its power is P s ; channel by produced, of which Obeying zero mean variance is The complex Gaussian circular symmetric distribution of , 0≤γ≤1 indicates the correlation factor, γ=0 indicates that the receiving antennas are not correlated, and γ=1 indicates that the receiving antennas are compl...

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Abstract

The invention belongs to the technical field of cognitive radio, relates to a spectrum sensing method for multiple antennas. When it is sensed that the user has multiple space related antennas, a multi-antenna spectrum sensing problem is equivalent to a Ljung-Box (LB) test problem. It is well known that one complex multiplication involves four real number multiplication and two real number addition. In the method, a received signal is converted from a complex number field to a real number field, so that the calculation complexity is reduced effectively.

Description

technical field [0001] The invention belongs to the technical field of cognitive radio, and relates to a spectrum sensing method for multiple antennas. Background technique [0002] Cognitive radio technology can effectively improve spectrum utilization by allowing cognitive users to use licensed frequency bands (spectrum holes). As the core part of cognitive radio technology, spectrum sensing enables cognitive users to reliably detect spectrum holes without causing interference to licensed users, and use the frequency band once a spectrum hole is found. Among many detection methods, the energy detection method does not require prior knowledge of the primary user signal and has low computational complexity, making it easy for practical application; however, the detection performance of ED is easily affected by the uncertainty of noise variance. Using multi-antenna technology can overcome the influence of noise variance uncertainty, such as weighted covariance-based detector...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/08H04B17/382H04B17/391
CPCH04B7/0802H04B17/382H04B17/391H04B2201/692
Inventor 陈安志史治平
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA