A Spectrum Sensing Method Based on Amplitude Spectral Correlation Coefficient of Multi-antenna System

A multi-antenna system and correlation coefficient technology, which is applied in the field of cognitive radio spectrum sensing, can solve the problems of small amount of calculation and poor spectrum sensing performance, and achieve the effect of high spectrum sensing performance and good spectrum sensing performance

Inactive Publication Date: 2016-04-20
NINGBO UNIV
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Problems solved by technology

The energy detection method proposed by Urkowitz et al. has the characteristics of simple implementation and small amount of calculation, but the method has poor spectrum sensing performance when the noise power is unknown.
Recently, Tugnait proposed a spectrum sensing method based on frequency domain covariance matrix in "Onmultiple antenna spectrum sensing under noise variance uncertainty and flat fading" (multi-antenna spectrum sensing method in noise uncertainty and flat fading channel) published in 2014. It has better spectrum sensing performance, but the spectrum sensing performance of this method in frequency selective fading channel is poor

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  • A Spectrum Sensing Method Based on Amplitude Spectral Correlation Coefficient of Multi-antenna System
  • A Spectrum Sensing Method Based on Amplitude Spectral Correlation Coefficient of Multi-antenna System

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Embodiment Construction

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0018] A spectrum sensing method based on the amplitude spectrum correlation coefficient of the multi-antenna system proposed by the present invention, its flow chart is as follows figure 1 As shown, it includes the following steps:

[0019] ① The cognitive radio system has K receiving antennas. During spectrum sensing, each receiving antenna samples the signal of the monitoring channel N times to obtain a sampled signal composed of N sampled values ​​on each receiving antenna. The kth The nth sampling value in the sampling signal on the receiving antenna is denoted as x k (n), where K≥2, such as K=4, N≥K, such as N=200, 1≤k≤K, 1≤n≤N.

[0020] ② Calculate the amplitude spectrum of the sampled signal on each receiving antenna, and record the n'th value in the amplitude spectrum of the sampled signal on the kth receiving antenna as z k (n'), ...

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Abstract

The invention discloses a spectrum sensing method based on the correlation coefficients of a multi-antenna system magnitude spectrum. The spectrum sensing method comprises the steps of sampling the signals of a monitoring channel by use of a plurality of receiving antennas to obtain sampled signals, calculating the magnitude spectrum of the sampled signal and then calculating the correlation coefficients of the magnitude spectrum, next, calculating test statistics, and finally, comparing the test statistics with a judgment threshold to judge whether the signal of an authorized user exists in the monitoring channel, thereby realizing spectrum sensing. When the different receiving antennas are different in noise power, the spectrum sensing method still has high spectrum sensing performance; in a frequency selective fading, the spectrum sensing method has better spectrum sensing performance than a method developed by Tugnait.

Description

technical field [0001] The invention relates to a cognitive radio spectrum sensing technology, in particular to a spectrum sensing method based on a multi-antenna system amplitude spectrum correlation coefficient. Background technique [0002] After the rapid development of wireless communication in recent decades, most of the available spectrum resources have been allocated to specific licensed users. That is to say, even if these spectrum resources are idle, unlicensed users cannot use them, which causes a large number of unlicensed users to compete for a small number of unlicensed frequency band resources. Various phenomena indicate that the current spectrum resources are becoming more and more scarce. However, studies have found that the utilization rate of spectrum resources allocated to licensed users is very low. The resource utilization rate of the licensed frequency band in space and time is between 15% and 85%, and its utilization rate is very unbalanced. If unli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/29H04B17/30
Inventor 金明李有明王刚
Owner NINGBO UNIV
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