CN115577253B - Supervision spectrum sensing method based on geometric power - Google Patents
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Abstract
The invention discloses a supervision spectrum sensing method based on geometric power, which relates to the field of spectrum sensing and comprises the following steps: constructing a noise model with generalized Gaussian distribution, and simulating and receiving signals in a noise environment generated by the noise model; carrying out geometric power solution on the received signals, and taking the obtained geometric power as a feature vector; constructing a supervised learning model, and training the supervised learning model through the feature vectors to obtain a trained supervised learning model; and acquiring and inputting the geometric power of the signal in the actual environment into the trained supervised learning model for spectrum sensing. The method has better sensing accuracy rate compared with a mode of sensing the frequency spectrum by using energy statistics and differential entropy by acquiring the geometric power of the received signal as the basis for sensing whether the frequency spectrum is used, especially under the condition of low signal-to-noise ratio.
Description
Technical Field
The invention relates to the field of spectrum sensing, in particular to a supervision spectrum sensing method based on geometric power.
Background
With the rapid development of wireless communication technology, more and more intelligent devices begin to become a part of internet of things and wireless communication, the demand of the devices on frequency spectrum is very large, and frequency spectrum resources are limited, so how to improve the frequency spectrum utilization rate is the focus of research now, and Cognitive Radio (CR) is one of the methods for solving the problem. Since Primary Users (PUs), i.e., users having licensed spectrum, are not using spectrum at all times, when a PU does not use the licensed spectrum, CR uses opportunity to use idle spectrum, so CR is also called Secondary Users (SUs), and SU can only use spectrum when PU is inactive, once PU uses spectrum, SU must quit using immediately and ensure no interference to PU, so it is very critical to detect whether spectrum is used by PU timely and accurately, spectrum Sensing (SS) in CR can solve this problem, but since wireless communication environment is very complex, SS process is affected by noise, shadow, multipath effect and other problems, resulting in poor detection performance, there are many studies on how to improve SS detection performance, especially under low signal-to-noise ratio.
Disclosure of Invention
Aiming at the defects in the prior art, the supervision spectrum sensing method based on the geometric power solves the problem that the existing spectrum sensing method is low in detection accuracy under the condition of low signal to noise ratio.
In order to achieve the purpose of the invention, the invention adopts the technical scheme that:
a supervised spectrum sensing method based on geometric power is provided, which comprises the following steps:
s1, constructing a noise model with generalized Gaussian distribution, and simulating and receiving signals in a noise environment generated by the noise model;
s2, solving the geometric power of the received signal, and taking the obtained geometric power as a feature vector;
s3, constructing a supervised learning model, and training the supervised learning model through the feature vectors to obtain a trained supervised learning model;
and S4, acquiring and inputting the geometric power of the signal in the actual environment into the trained supervised learning model for spectrum sensing.
Further, in step S1, the shape parameter of the noise is greater than 0 and less than or equal to 2, and the scale parameter of the noise is greater than 0.
Further, the specific method of step S2 includes the following sub-steps:
s2-1, sampling the received signals for N times, wherein the number of sampling points in each sampling is M, and obtaining N sample sets;
s2-2, according to a formula:
through the first stepiThe average value of the samples in the sample set replaces the expected value, and the average value is obtainediGeometric power corresponding to each sample set(ii) a WhereinDenotes the firstiIn a sample setjA sample is obtained;
s2-3, according to a formula:
Further, the specific method of step S3 includes the following substeps:
s3-1, according to a formula:
constructing hyperplane equation of supervised learning model to obtain linear kernel(ii) a WhereinIs a weight vector;is a deviation vector;represents a transpose of a matrix;andall are parameters to be trained of the supervised learning model; x is the input of the supervised learning model;
s3-3, taking the feature vector as the input of a supervised learning model, and acquiring the value of a linear kernel corresponding to the feature vector;
s3-4, when the value of the linear kernel corresponding to the feature vector is larger than or equal to 1, outputting a label of a frequency spectrum used by a master user by the supervised learning model; when the value of the linear kernel corresponding to the feature vector is less than or equal to-1, the supervised learning model outputs a label of the unused frequency spectrum of the master user;
s3-5, judging whether the classification success rate of the current supervised learning model reaches an expected value, and if so, taking the current supervised learning model as the supervised learning model after training; otherwise, entering step S3-6;
s3-6, constructing a loss function, calculating a loss value through a real label of the feature vector and an output label of the supervised learning model, and reversely propagating and updatingAndand returning to the step S3-3.
Further, the specific method for acquiring the geometric power of the signal in the actual environment in step S4 is as follows:
the geometric power of the signal in the actual environment is obtained in the same manner as in step S2.
Further, the supervised learning model in step S3 includes an SVM model and a KNN model.
The invention has the beneficial effects that: according to the method, the geometric power of the received signal is obtained to serve as the basis for sensing whether the frequency spectrum is used, and compared with a mode of sensing the frequency spectrum by using energy detection and differential entropy, the method has better sensing accuracy.
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FIG. 1 is a schematic flow diagram of the process;
FIG. 2 is a performance comparison diagram of SVM spectrum sensing method based on GP, ED and DE;
fig. 3 is a performance comparison diagram of KNN spectrum sensing method based on GP, ED and DE.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined by the appended claims, and all changes that can be made by the invention using the inventive concept are intended to be protected.
As shown in fig. 1, the method for sensing supervised spectrum based on geometric power includes the following steps:
s1, constructing a noise model with generalized Gaussian distribution, and simulating and receiving signals in a noise environment generated by the noise model;
s2, solving the geometric power of the received signal, and taking the obtained geometric power as a feature vector;
s3, constructing a supervised learning model, and training the supervised learning model through the feature vectors to obtain a trained supervised learning model;
and S4, acquiring and inputting the geometric power of the signal in the actual environment into the trained supervised learning model for spectrum sensing.
In the step S1, the shape parameter of the noise is more than 0 and less than or equal to 2, and the scale parameter of the noise is more than 0. Probability density function of noise modelComprises the following steps:
whereinIs a gamma function;expressed as natural constantseA base exponential function;xis noise;representing a set of real numbers.
The specific method of step S2 includes the following substeps:
s2-1, sampling the received signals for N times, wherein the number of sampling points in each sampling is M, and obtaining N sample sets;
s2-2, according to a formula:
through the first stepiThe average value of the samples in the sample set replaces the expected value, and the average value is obtainediGeometric power corresponding to each sample set(ii) a WhereinIs shown asiIs concentrated in a samplejA sample is obtained;
s2-3, according to a formula:
The specific method of step S3 includes the following substeps:
s3-1, according to a formula:
constructing a hyperplane equation of a supervised learning model to obtain a linear kernel(ii) a WhereinIs a weight vector;is a deviation vector;represents a transpose of a matrix;andall are parameters to be trained of the supervised learning model; x is the input of the supervised learning model;
s3-3, taking the feature vector as the input of a supervised learning model, and acquiring the value of a linear kernel corresponding to the feature vector;
s3-4, when the value of the linear kernel corresponding to the feature vector is larger than or equal to 1, outputting a label of a frequency spectrum used by a master user by the supervised learning model; when the value of the linear kernel corresponding to the feature vector is less than or equal to-1, outputting a label of the unused frequency spectrum of the main user by the supervised learning model;
s3-5, judging whether the classification success rate of the current supervised learning model reaches an expected value or not, and if so, taking the current supervised learning model as the trained supervised learning model; otherwise, entering step S3-6;
s3-6, constructing a loss function, calculating a loss value through a real label of the feature vector and an output label of the supervised learning model, and reversely propagating and updatingAndand returning to the step S3-3.
The specific method for acquiring the geometric power of the signal in the actual environment in step S4 is as follows: the geometric power of the signal in the actual environment is obtained in the same manner as in step S2.
The supervised learning model in the step S3 comprises an SVM model and a KNN model, and the SVM model is preferentially adopted.
In an embodiment of the present invention, an SVM and a KNN are respectively used as a supervised learning model, as shown in fig. 2 and fig. 3 (the abscissa is a signal-to-noise ratio, and the ordinate is a detection accuracy), the method has a large difference in performance between a method using geometric power (gp) as a feature vector and a method using energy statistics (es) and differential entropy (de) as a feature vector, specifically, when the signal-to-noise ratio is lower than-25 dB, the detection accuracy of the method is far higher than that of the method using energy statistics (es) and differential entropy (de), and the method starts at a signal-to-noise ratio of-30 dB, and can achieve a detection accuracy close to 100%, and the detection effect of the method is better than that of the other two methods.
Claims (3)
1. A supervised spectrum sensing method based on geometric power is characterized by comprising the following steps:
s1, constructing a noise model with generalized Gaussian distribution, and simulating and receiving signals in a noise environment generated by the noise model;
s2, solving the geometric power of the received signal, and taking the obtained geometric power as a feature vector;
s3, constructing a supervised learning model, and training the supervised learning model through the feature vectors to obtain a trained supervised learning model;
s4, acquiring and inputting the geometric power of the signal in the actual environment into the trained supervised learning model for spectrum sensing;
the specific method of step S2 includes the following substeps:
s2-1, sampling the received signals for N times, wherein the number of sampling points in each sampling is M, and obtaining N sample sets;
s2-2, according to a formula:
replacing the expected value by the average value of the samples in the ith sample set, and obtaining the geometric power corresponding to the ith sample set(ii) a WhereinRepresenting the jth sample in the ith sample set;
s2-3, according to a formula:
The specific method of step S3 includes the following substeps:
s3-1, according to a formula:
constructing hyperplane equation of supervised learning model to obtain linear kernel(ii) a WhereinIs a weight vector;is a deviation vector;represents a transpose of a matrix;andall are parameters to be trained of the supervised learning model; x is the input of the supervised learning model;
s3-3, taking the feature vector as the input of a supervised learning model, and acquiring the value of a linear kernel corresponding to the feature vector;
s3-4, when the value of the linear kernel corresponding to the feature vector is larger than or equal to 1, outputting a label of a frequency spectrum used by a master user by the supervised learning model; when the value of the linear kernel corresponding to the feature vector is less than or equal to-1, outputting a label of the unused frequency spectrum of the main user by the supervised learning model;
s3-5, judging whether the classification success rate of the current supervised learning model reaches an expected value or not, and if so, taking the current supervised learning model as the trained supervised learning model; otherwise, entering step S3-6;
s3-6, constructing a loss function, calculating a loss value through a real label of the feature vector and an output label of the supervised learning model, and reversely propagating and updatingAndreturning to the step S3-3;
the specific method for acquiring the geometric power of the signal in the actual environment in step S4 is as follows:
the geometric power of the signal in the actual environment is obtained in the same manner as in step S2.
2. The supervised spectrum sensing method based on geometric power as recited in claim 1, wherein in step S1, a shape parameter of the noise is greater than 0 and less than or equal to 2, and a scale parameter of the noise is greater than 0.
3. The supervised geometric power-based supervised spectrum sensing method according to claim 1, wherein the supervised learning model in step S3 comprises an SVM model and a KNN model.
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