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Spectrum Sensing Method Based on Symmetric Peak of Circular Autocorrelation Function of Modulated Signal

A technology of autocorrelation function and modulated signal, which is applied in the field of spectrum sensing to achieve the effect of improving spectrum detection rate, reducing conflict probability and realizing global optimization.

Active Publication Date: 2020-11-27
NANTONG UNIVERSITY +1
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Problems solved by technology

This method has robust spectrum detection performance in the environment of low SNR and noise fluctuation, and effectively solves the problem of spectrum detection in the current cognitive wireless communication network in the environment of low SNR and noise fluctuation

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  • Spectrum Sensing Method Based on Symmetric Peak of Circular Autocorrelation Function of Modulated Signal
  • Spectrum Sensing Method Based on Symmetric Peak of Circular Autocorrelation Function of Modulated Signal
  • Spectrum Sensing Method Based on Symmetric Peak of Circular Autocorrelation Function of Modulated Signal

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0035] Include at least 1 main user and 1 cognitive user in a cognitive network, such as figure 1 As shown, the detection signal received by the cognitive user is y(t)=s(t)+n(t), where s(t) is the signal transmitted by the primary user, and in this example s(t) is a The bit rate is 250Kbits / s, the carrier is a binary phase-modulated signal of 320MHz, n(t) is channel noise, 0≤t≤T, T is the cognitive user spectrum detection time, and the present invention implements the peak value based on the cyclic autocorrelation function of the modulated signal A symmetrical spectrum sensing method, comprising the following steps:

[0036] Step 1. Set the significance level factor, according to the cognitive network false alarm rate P fa It is required to set the significance level factor β such that established, in this embodiment, the cognitive network ...

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Abstract

The present invention relates to a spectrum sensing method based on symmetric peaks of a cyclic autocorrelation function of a modulation signal. A cognitive user performs cyclic autocorrelation function calculation on a received signal to accordingly form a two-dimensional signal detection domain, and finally searches for symmetric peak points in the signal detection domain to determine whether there is a main user signal, and if there are symmetric peak points in the two-dimensional signal detection domain, the cognitive user determines that there is a main user signal, otherwise, determines that there is no main user signal. In order to ensure the false alarm probability of spectrum sensing, in the present invention, a symmetric peak point significance level factor is introduced into a process of searching for the symmetric peak points. According to the method of the present invention, whether there is a main user signal is determined according to the symmetry of peaks of a cyclic autocorrelation function of a modulation signal, and no prior knowledge of any main user signal and channel is required, thereby eliminating the impact of channel noise fluctuation on the performance of spectrum sensing, and solving the problem of signal spectrum sensing in an environment with a small signal-to-noise ratio and channel noise fluctuation.

Description

technical field [0001] The invention relates to the field of cognitive wireless communication, in particular to a spectrum sensing method in a cognitive radio environment. Background technique [0002] With the increasing development of wireless communications, especially the arrival of the 5G era, more and more wireless data transmission business requirements have led to increasingly tight spectrum resources. Improving spectrum utilization is one of the effective ways to alleviate the shortage of spectrum resources. Cognitive radio technology uses artificial intelligence to perceive the wireless communication environment, dynamically detects the use information of spectrum resources around it, and adaptively changes its own system operating parameters in real time to effectively use idle spectrum and improve spectrum utilization. [0003] There are many spectrum sensing methods in cognitive wireless networks, such as energy detection, matched filter detection, eigenvalue d...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/382
CPCH04B17/382
Inventor 张士兵张硕张晓格陈永红陈家俊
Owner NANTONG UNIVERSITY
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