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Cognitive radio frequency spectrum sensing method based on circulation symmetry

A cognitive radio and spectrum sensing technology, applied in electrical components, transmission monitoring, transmission systems, etc., can solve the problems of large amount of calculation, low accuracy of spectrum sensing, and complicated calculation, and achieve the effect of improving accuracy.

Inactive Publication Date: 2011-06-29
HARBIN INST OF TECH
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  • Summary
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Problems solved by technology

[0022] The purpose of the present invention is to solve the problem that the existing method of realizing the radio sensing spectrum by whether the cyclic spectrum of the received signal has symmetry has a large amount of calculation, complicated operation, and the accuracy of spectrum sensing is not high under the condition of low signal-to-noise ratio. Provides a cyclic symmetry-based method for cognitive radio spectrum sensing

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  • Cognitive radio frequency spectrum sensing method based on circulation symmetry
  • Cognitive radio frequency spectrum sensing method based on circulation symmetry
  • Cognitive radio frequency spectrum sensing method based on circulation symmetry

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specific Embodiment approach 1

[0054] Specific implementation mode one: the following combination figure 1 , Figure 4 and Figure 5 This embodiment is described. A cyclic symmetry-based cognitive radio spectrum sensing method described in this embodiment is characterized in that the method includes the following steps:

[0055] Step 1, sampling the radio signal, and using the SSCA algorithm to obtain the cyclic spectrum of the radio signal;

[0056] Step 2. Select 15 pairs of symmetrical points on the cyclic spectrum obtained in Step 1;

[0057] Step 3, calculating the sum of the 15 pairs of symmetrical point amplitude differences described in step 2;

[0058] Step 4, judging whether the sum of the 15 pairs of symmetry point amplitude differences obtained in step 3 is less than the symmetry judgment threshold,

[0059] If the judgment result is yes, it is determined that there is a primary user signal in the channel; if the judgment result is no, it is determined that there is no primary user signal i...

specific Embodiment approach 2

[0063] Specific implementation mode two: this implementation mode further explains implementation mode one, the radio signal is sampled in step one, and the process of using the SSCA algorithm to obtain the cyclic spectrum of the radio signal is:

[0064] Step 11, receiving radio signals;

[0065] Step 12, perform down-conversion processing, and process the received radio signal into an intermediate frequency signal, and the frequency of the intermediate frequency signal is 700MHz~6GHz;

[0066] Step 13, sampling the intermediate frequency signal in step 12, the sampling frequency is 2.5 to 4 times the frequency of the intermediate frequency signal;

[0067] Step 14: Obtain the cyclic spectrum of the radio signal by using the SSCA algorithm on the sampled signal acquired in step 13.

specific Embodiment approach 3

[0068] Specific implementation mode three: this implementation mode further explains implementation mode one, and the process of selecting 15 pairs of symmetrical points on the cyclic spectrum in step two is:

[0069] The cyclic spectrum is a two-dimensional frequency plane, the abscissa is the cyclic frequency α, and the ordinate is the spectral frequency f,

[0070] The point selected for spectral frequency f is f s / 4, 0, -f s / 4,

[0071] where f s is the sampling frequency,

[0072] The point selected for cycle frequency α is -f s (1 / 2+4 / N′), -f s / 2, -f s (1 / 2-4 / N'), -f s (8 / N'), -f s (4 / N'), f s (4 / N'), f s (8 / N'), f s (1 / 2-4 / N′), f s / 2, f s (1 / 2+4 / N′),

[0073] Among them, N' is the number of FFT points of SSCA algorithm in complex demodulation,

[0074] The symmetry points of the cycle frequency α corresponding to each spectral frequency f are: -f s (1 / 2+4 / N') and f s (1 / 2+4 / N'); -f s / 2 and f s / 2; -f s (1 / 2-4 / N') and f s (1 / 2-4 / N'); -f s (8 / N'...

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Abstract

The invention relates to a cognitive radio frequency spectrum sensing method based on circulation symmetry, belonging to the field of communication. The invention aims at solving the problems that the calculated quantity is high, the operation is complex and the accuracy of frequency spectrum sensing is low under the condition of low signal to noise ratio in the traditional method for realizing radio frequency spectrum sensing by judging whether cyclic spectrum of a received signal has symmetry. The method provided by the invention comprises the following steps of: 1, sampling a radio signal,and acquiring the cyclic spectrum of the radio signal by adopting an SSCA (stochastic sparse-grid collocation algorithm) algorithm; 2, selecting 15 pairs of symmetric points on the cyclic spectrum acquired in the step 1; 3, calculating the sum of the amplitude differences of the 15 pairs of symmetrical points selected in the step 2; and 4, judging whether the sum of the amplitudes differences of the 15 pairs of symmetrical points is less than a symmetry decision threshold, if the sum is less than the symmetry decision threshold, judging that a master user signal is existed in a channel; and if the sum is not less than the symmetry threshold, judging that no master user signal is existed in the channel. The accuracy of spectrum sensing under the condition of low signal-to-noise ratio is obviously improved.

Description

technical field [0001] The invention relates to a cognitive radio spectrum sensing method based on cyclic symmetry, which belongs to the communication field. Background technique [0002] Cognitive radio is a technical means to fundamentally improve the spectrum efficiency, power efficiency, and system capacity of wireless communication. It can meet the needs of high-speed and high-quality information services for broadband wireless communication in the future. It is a scalable and reconfigurable communication system. one of the technologies. The communication environment of the cognitive radio system is relatively complex and harsh. It is required that the spectrum sensing algorithm, which is the core and basis of cognitive radio, also have good performance under low signal-to-noise ratio, and the cyclostationary theory establishes the so-called cyclic frequency -The two-dimensional spectrum plane of spectral frequency opens up a richer signal analysis field, and because o...

Claims

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Application Information

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IPC IPC(8): H04B17/00H04B17/382
Inventor 高玉龙吴少川白旭管修挚常坚沙学军张佳岩
Owner HARBIN INST OF TECH
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