CN105187142A - Method and device for detecting idle spectrum - Google Patents
Method and device for detecting idle spectrum Download PDFInfo
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- CN105187142A CN105187142A CN201510639556.XA CN201510639556A CN105187142A CN 105187142 A CN105187142 A CN 105187142A CN 201510639556 A CN201510639556 A CN 201510639556A CN 105187142 A CN105187142 A CN 105187142A
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Abstract
The embodiment of the present invention discloses a method and device for detecting an idle spectrum. The method comprises: receiving a request whether a detected licensed spectrum sent by a first cognitive radio node is the idle spectrum; determining at least one cooperative cognitive radio node according to position information of the first cognitive radio node carried in the request; determining a final judgment result according to local judgment information of the first cognitive radio node carried in a selected fusion rule processing request after wavelet denoising processing and local judgment information sent by all cooperative cognitive radio nodes; and sending the determined final judgment result to the first cognitive radio node and all the cooperative cognitive radio nodes, so as to determine whether communication is performed on the licensed spectrum according to the determined final judgment result. Through the application of the embodiment of the present invention, the accuracy of detecting the idle spectrum can be improved, thereby ensuring that no influence exists on the communication of a master user when the licensed spectrum is used at the cognitive radio nodes.
Description
Technical field
The present invention relates to cognitive radio electro-technical field, particularly the method and apparatus that detects of a kind of idle frequency spectrum.
Background technology
In recent years, along with the increase to frequency spectrum resource demand, also become more and more important about cognitive radio power technology.Cognitive radio is one dynamically perception surrounding environment, and adjusts a kind of dynamic spectrum technology of sharing of oneself transformation parameter.The required key problem solved of cognitive radio is the working condition how accurately identifying spectrum occupancy and primary user, i.e. first step of cognitive radio work: spectrum occupancy detects.The groundwork that spectrum occupancy detects is the spectrum occupancy detected in certain certain limit, whether there is the situation that primary user is taking, and then carries out differentiation to frequency spectrum and is used on this basis.Obtain in the process of primary user's signal perception user, be inevitably subject to the impact of the factors such as multipath, shade and local interference, the signal causing perception user to intercept and capture is too faint and cause misjudgment, causes interference to primary user.Now, the process of spectrum occupancy detection will have been helped by cooperative detection.
In cooperative detection, collaboration user, by the Detection Information of multiple cognitive radio (CR-CognitiveRadio) node is carried out fusion treatment, to improve detection perform, also reduces the requirement of the detection perform to each node simultaneously relatively.But in cooperative detection, to the multiple CR nodes selected, can not determine that the local detecting reliability of each node is enough high.When the CR node selected, when the node that reliability is not high is more, the effect of cooperative detection may not as good as the detection perform of unique user, therefore, certain reliability requirement to be had for the CR node participating in cooperation, even if when the CR node selected is to the channel circumstance difference of primary user base station, also require that this node has good detection perform.
In prior art, when extraneous communication environment difference, namely low signal-to-noise ratio (SNR-SignaltoNoiseRatio) can cause the sudden change of detection perform, can cause hydraulic performance decline when cooperative detection, and comparatively big error appears in testing result.
Summary of the invention
The object of the embodiment of the present invention is the method and apparatus providing a kind of idle frequency spectrum to detect, and can improve low signal-to-noise ratio, to improve the accuracy of idle frequency spectrum detection.
For achieving the above object, the embodiment of the invention discloses the method for a kind of idle frequency spectrum detection, be applied to network side, described method comprises step:
Receive the request whether detection mandate frequency spectrum that the first cognition wireless electrical nodes sends is idle frequency spectrum, described request comprises: the positional information of described first cognition wireless electrical nodes and local discriminative information; Described local discriminative information is after to be the first cognition wireless electrical nodes carry out Wavelet Denoising Method to mandate spectrum signal, carries out energy measuring acquisition;
According to the positional information of described first cognition wireless electrical nodes, determine at least one cooperative cognitive radio node;
According to the local discriminative information of described first cognition wireless electrical nodes, the local discriminative information that at least one the cooperative cognitive radio node received sends, select the fusion criterion that default, according to the local discriminative information of the first cognition wireless electrical nodes received described in selected fusion criterion process and the local discriminative information of the cognition wireless electrical nodes of at least one cooperation, determine final judging result, described final judging result comprises determines whether described mandate frequency spectrum is idle frequency spectrum;
The described final judging result determined is sent to the cognition wireless electrical nodes of described first cognition wireless electrical nodes and at least one cooperation, to make it according to the described final judging result determined, determine whether at the enterprising Serial Communication of described mandate frequency spectrum.
For achieving the above object, the embodiment of the invention discloses the method for a kind of idle frequency spectrum detection, be applied to cognition wireless electrical nodes, described method comprises step:
Obtain own location information;
After Wavelet Denoising Method is carried out to mandate spectrum signal, carry out energy measuring, obtain local discriminative information;
Positional information and described local discriminative information are sent to network side; With the cognition wireless electrical nodes making network side send to described cognition wireless electrical nodes to cooperate with at least one the described final judging result determined by step according to claim 1;
Receive the final judging result that network side sends;
According to the described final judging result determined, determine whether at the enterprising Serial Communication of described mandate frequency spectrum.
Preferably, the local discriminative information of described acquisition, comprising:
The mandate spectrum signal that cognition wireless electrical nodes receives according to it, carry out energy measuring, wherein, described mandate spectrum signal comprises: by the signal of noise pollution, described energy measuring comprises: by the signal of noise pollution through Wavelet Denoising Method, obtain estimated signal, then judge whether estimated signal is 0
If judged result is estimated signal is 0, then cognition wireless electrical nodes determines that described mandate frequency spectrum does not exist primary user, determines that described mandate frequency spectrum is idle frequency spectrum,
If judged result is estimated signal is not 0, then described estimated signal is after analog-to-digital conversion, squarer and sampling summation, and obtain detection statistic, cognition wireless electrical nodes determines its local discriminative information according to described detection statistic;
Described Wavelet Denoising Method comprises: by described by the signal map of noise pollution to wavelet field, generate band wavelet coefficient small echo signal, arrange mask operator, with the coefficient entry making small echo signal only retain default wavelet coefficient, other wavelet coefficients are set to 0.
Preferably, described cognition wireless electrical nodes determines its local discriminative information according to described detection statistic, comprising:
Described detection statistic and the threshold value preset are compared, the threshold value preset described in if described detection statistic is greater than, then cognition wireless electrical nodes determines that described mandate frequency spectrum exists primary user, determine that described mandate frequency spectrum is busy frequency spectrum, the threshold value preset described in if described detection statistic is less than or equal to, there is not primary user in the mandate frequency spectrum that then cognition wireless electrical nodes determines described perception, determine that described mandate frequency spectrum is idle frequency spectrum.
Preferably, described method also comprises:
Cognition wireless electrical nodes, in the enterprising Serial Communication process of described mandate frequency spectrum, sends own location information and local court verdict to network side in real time; The final judging result sent when the network side received represents that described mandate frequency spectrum is taken by primary user, then stop using described mandate frequency spectrum to communicate.
For achieving the above object, the embodiment of the invention discloses the device of a kind of idle frequency spectrum detection, be applied to network side, described device comprises:
Request receiving module: whether the detection mandate frequency spectrum sent for receiving the first cognition wireless electrical nodes is the request of idle frequency spectrum, and described request comprises: the positional information of described first cognition wireless electrical nodes and local discriminative information; Described local discriminative information is after to be the first cognition wireless electrical nodes carry out Wavelet Denoising Method to mandate spectrum signal, carries out energy measuring acquisition;
First determination module: for the positional information according to described first cognition wireless electrical nodes, determine at least one cooperative cognitive radio node;
Discriminative information determination module: for the local discriminative information according to described first cognition wireless electrical nodes, the local discriminative information that at least one the cooperative cognitive radio node received sends, select the fusion criterion that default, according to the local discriminative information of the first cognition wireless electrical nodes received described in selected fusion criterion process and the local discriminative information of the cognition wireless electrical nodes of at least one cooperation, determine final judging result, described final judging result comprises determines whether described mandate frequency spectrum is idle frequency spectrum;
Court verdict sending module: for the described final judging result determined being sent to the cognition wireless electrical nodes of described first cognition wireless electrical nodes and at least one cooperation, to make it according to the described final judging result determined, determine whether at the enterprising Serial Communication of described mandate frequency spectrum.
For achieving the above object, the embodiment of the invention discloses the device of a kind of idle frequency spectrum detection, be applied to cognition wireless electrical nodes, described device comprises:
Position information acquisition module: for obtaining own location information;
Local judging module: after Wavelet Denoising Method is carried out to mandate spectrum signal, carry out energy measuring, obtain local discriminative information;
Information sending module: for positional information and described local discriminative information are sent to network side; With the cognition wireless electrical nodes making network side send to described cognition wireless electrical nodes to cooperate with at least one the described final judging result determined by step according to claim 1;
Conclusive judgement information receiving module: for receiving the final judging result that network side sends;
Second determination module: for according to the described final judging result determined, determine whether at the enterprising Serial Communication of described mandate frequency spectrum.
Preferably, described local judging module, specifically for:
The mandate spectrum signal that cognition wireless electrical nodes receives according to it, carry out energy measuring, wherein, described mandate spectrum signal comprises: by the signal of noise pollution, described energy measuring comprises: by the signal of noise pollution through Wavelet Denoising Method, obtain estimated signal, then judge whether estimated signal is 0
If judged result is estimated signal is 0, then cognition wireless electrical nodes determines that described mandate frequency spectrum does not exist primary user, determines that described mandate frequency spectrum is idle frequency spectrum,
If judged result is estimated signal is not 0, then described estimated signal is after analog-to-digital conversion, squarer and sampling summation, and obtain detection statistic, cognition wireless electrical nodes determines its local discriminative information according to described detection statistic;
Described Wavelet Denoising Method comprises: by described by the signal map of noise pollution to wavelet field, generate band wavelet coefficient small echo signal, arrange mask operator, with the coefficient entry making small echo signal only retain default wavelet coefficient, other wavelet coefficients are set to 0.
Preferably, when described local judging module determines its local discriminative information according to described detection statistic:
Described detection statistic and the threshold value preset are compared, the threshold value preset described in if described detection statistic is greater than, then cognition wireless electrical nodes determines that described mandate frequency spectrum exists primary user, determine that described mandate frequency spectrum is busy frequency spectrum, the threshold value preset described in if described detection statistic is less than or equal to, there is not primary user in the mandate frequency spectrum that then cognition wireless electrical nodes determines described perception, determine that described mandate frequency spectrum is idle frequency spectrum.
Preferably, described information sending module also for: in the enterprising Serial Communication process of described mandate frequency spectrum, send own location information and local court verdict to network side in real time;
Described device also comprises stops using module, described in stop using module specifically for: when receive network side send final judging result represent that described mandate frequency spectrum is taken by primary user, then stop using described mandate frequency spectrum to communicate.
As seen from the above technical solutions, the embodiment of the invention discloses the method and apparatus of a kind of idle frequency spectrum detection, method comprises step, receive the request whether detection mandate frequency spectrum that the first cognition wireless electrical nodes sends is idle frequency spectrum, described request comprises: the positional information of described first cognition wireless electrical nodes and local discriminative information; Described local discriminative information is after to be the first cognition wireless electrical nodes carry out Wavelet Denoising Method to mandate spectrum signal, carries out energy measuring acquisition; According to the positional information of described first cognition wireless electrical nodes, determine at least one cooperative cognitive radio node; According to the local discriminative information of described first cognition wireless electrical nodes, the local discriminative information that at least one the cooperative cognitive radio node received sends, select the fusion criterion that default, according to the local discriminative information of the first cognition wireless electrical nodes received described in selected fusion criterion process and the local discriminative information of the cognition wireless electrical nodes of at least one cooperation, determine final judging result, described final judging result comprises determines whether described mandate frequency spectrum is idle frequency spectrum; The described final judging result determined is sent to the cognition wireless electrical nodes of described first cognition wireless electrical nodes and at least one cooperation, to make it according to the described final judging result determined, determine whether at the enterprising Serial Communication of described mandate frequency spectrum.In the embodiment of the present invention, mandate spectrum signal is carried out Wavelet Denoising Method process, and carry out amalgamation judging by network side determination cooperative cognitive radio node, improve low signal-to-noise ratio, be that follow-up signal energy detects, find idle frequency spectrum and improve accuracy.Certainly, arbitrary product of the present invention is implemented or method must not necessarily need to reach above-described all advantages simultaneously.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic flow sheet of the method embodiments providing the detection of a kind of idle frequency spectrum;
Fig. 2 is the schematic flow sheet of the method embodiments providing the detection of another kind of idle frequency spectrum;
Fig. 3 is the structural representation of the device embodiments providing the detection of a kind of idle frequency spectrum;
Fig. 4 is the structural representation of the device embodiments providing the detection of another kind of idle frequency spectrum.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiments provide the method and apparatus of a kind of idle frequency spectrum detection, in the program, receive the request whether detection mandate frequency spectrum that the first cognition wireless electrical nodes sends is idle frequency spectrum, described request comprises: the positional information of described first cognition wireless electrical nodes and local discriminative information; Described local discriminative information is after to be the first cognition wireless electrical nodes carry out Wavelet Denoising Method to mandate spectrum signal, carries out energy measuring acquisition; According to the positional information of described first cognition wireless electrical nodes, determine at least one cooperative cognitive radio node; According to the local discriminative information of described first cognition wireless electrical nodes, the local discriminative information that at least one the cooperative cognitive radio node received sends, select the fusion criterion that default, according to the local discriminative information of the first cognition wireless electrical nodes received described in selected fusion criterion process and the local discriminative information of the cognition wireless electrical nodes of at least one cooperation, determine final judging result, described final judging result comprises determines whether described mandate frequency spectrum is idle frequency spectrum; The described final judging result determined is sent to the cognition wireless electrical nodes of described first cognition wireless electrical nodes and at least one cooperation, to make it according to the described final judging result determined, determine whether at the enterprising Serial Communication of described mandate frequency spectrum.
Below by specific embodiment, the present invention is described in detail.
The schematic flow sheet of the method for a kind of idle frequency spectrum detection that Fig. 1 provides for the embodiment of the present invention, is applied to network side, comprises the steps:
S101: receive the request whether detection mandate frequency spectrum that the first cognition wireless electrical nodes sends is idle frequency spectrum, described request comprises: the positional information of described first cognition wireless electrical nodes and local discriminative information; Described local discriminative information is after to be the first cognition wireless electrical nodes carry out Wavelet Denoising Method to mandate spectrum signal, carries out energy measuring acquisition.
According to prior art, cognition wireless electrical nodes each carve and all identify the radio signal in surrounding environment residing for it in perception, wherein said radio signal comprises described mandate spectrum signal, and other radio signals.
Whether concrete example authorizes frequency spectrum to be the request of idle frequency spectrum as: network side have received a detection that the first cognition wireless electrical nodes sends, described request comprises: the positional information of the first cognition wireless electrical nodes and local discriminative information, if positional information is that the first cognition wireless electrical nodes is positioned at Shanghai, local discriminative information is after the first radio node carries out Wavelet Denoising Method process to the mandate spectrum signal itself received, after obtaining filtering interfering noise signal, what obtained by energy measuring, the local discriminative information supposing the first radio node for this mandate frequency spectrum be idle frequency spectrum.
S102: according to the positional information of described first cognition wireless electrical nodes, determine at least one cooperative cognitive radio node.
According to the positional information of described first cognition wireless electrical nodes, a position range threshold value can be set, determine that the cognition wireless electrical nodes within the range threshold of position is defined as at least one cooperative cognitive radio node; Also can set concrete range step, the cognition wireless electrical nodes being chosen at the position of the range step of described setting is defined as at least one cooperative cognitive radio node.
Concrete example as: setting position range threshold is 200 kms, then determine that the cognition wireless electrical nodes within position range threshold 200 km is defined as at least one cooperative cognitive radio node, described at least one cooperative cognitive radio node determined of being tongue-tied has three, is respectively cognition wireless electrical nodes A, cognitive radio Node B, cognition wireless electrical nodes C.
It should be noted that, not to the positional information according to the first cognition wireless electrical nodes in the application, determine that the specific implementation of at least one cooperative cognitive radio node limits, any possible implementation can be applied in the application.
S103: according to the local discriminative information of described first cognition wireless electrical nodes, the local discriminative information that at least one the cooperative cognitive radio node received sends, select the fusion criterion that default, according to the local discriminative information of the first cognition wireless electrical nodes received described in selected fusion criterion process and the local discriminative information of the cognition wireless electrical nodes of at least one cooperation, determine final judging result, described final judging result comprises determines whether described mandate frequency spectrum is idle frequency spectrum.
Concrete example as: according to step S102, determine three cognition wireless electrical nodes at least one cooperative cognitive radio node, be respectively cognition wireless electrical nodes A, cognitive radio Node B, cognition wireless electrical nodes C, after wherein said cognition wireless electrical nodes A detects described mandate frequency spectrum, the local discriminative information obtained is described mandate frequency spectrum is idle frequency spectrum, after described cognitive radio Node B detects described mandate frequency spectrum, the local discriminative information obtained is described mandate frequency spectrum is idle frequency spectrum, after described cognition wireless electrical nodes C detects described mandate frequency spectrum, the local discriminative information obtained is described mandate frequency spectrum is busy frequency spectrum, the local discriminative information that self obtains by three cognition wireless electrical nodes respectively that be defined as cooperative cognitive radio node sends to network side.
Network side selects a default fusion criterion, according to the local discriminative information of the first cognition wireless electrical nodes received described in selected fusion criterion process and the local discriminative information of three cognition wireless electrical nodes cooperated, determines final judging result.
Suppose H
0represent that described mandate frequency spectrum is idle frequency spectrum, namely use without primary user; H
1represent that described mandate frequency spectrum is busy frequency spectrum, namely have primary user to use.
Criterion main in spectrum detection is detection probability, false alarm probability and false dismissal probability, as shown in the formula:
P
d=Prob{ judgement is H
1| H
1;
P
f=Prob{ judgement is H
1| H
0;
P
m=Prob{ judgement is H
0| H
1;
Suppose to have selected a kind of K/N fusion criterion, the overall false alarm probability under this fusion criterion and detection probability are respectively
Wherein
with
represent false alarm probability and the detection probability of single cognition wireless electrical nodes respectively, u
irepresent the local discriminative information of cognitive radio node i, i.e. u
iwhen=1, local judgement is H
1, u
iwhen=0, local judgement is H
0.As k=1, K/N criterion is OR criterion, and during k=n, K/N criterion is AND criterion, when
time, be MOST criterion.
Wherein, as k=n, when using fusion criterion for AND criterion, only have when all local discriminative informations for judgement authorizes frequency spectrum to be busy frequency spectrum and all u
iwhen=1, final judging result just can think that primary user exists, and this mandate frequency spectrum is busy frequency spectrum, i.e. u
0=1, otherwise fusion center thinks that primary user does not exist, and this mandate frequency spectrum is idle frequency spectrum, i.e. u
0=0.Require harsh to the testing conditions of frequency spectrum, make under equal conditions detection probability low.N represents the total quantity of cognition wireless electrical nodes; K represents that court verdict is determine to authorize nodes frequency spectrum existing the cognition wireless electrical nodes of primary user.
As k=1, when using fusion criterion for OR criterion, contrary with AND criterion, as long as this criterion has a local discriminative information for authorizing frequency spectrum to be busy frequency spectrum, namely there is a u
iwhen=1, final judging result just exists for primary user, i.e. u
0=1, authorize frequency spectrum to be busy frequency spectrum; Otherwise only have when all local discriminative informations are for authorizing frequency spectrum to be idle frequency spectrum, final judging result just can think that primary user does not exist, i.e. u
0=0, mandate frequency spectrum is idle frequency spectrum, and detection probability when this criterion exists for primary user improves greatly, but false alarm probability when not existing for primary user also obviously raises.
When
time, the fusion criterion used is MOST criterion, to be now local discriminative information be authorizes frequency spectrum to be that to be more than or equal to local discriminative information be authorize frequency spectrum to be the number of the cognition wireless electrical nodes of busy frequency spectrum for the number of the cognition wireless electrical nodes of idle frequency spectrum, final judging result is authorize frequency spectrum to be idle frequency spectrum, otherwise on the contrary.
Suppose that fusion criterion selects MOST criterion, firmly believe radio node A, B, C in conjunction with the first cognition wireless electrical nodes and described three cooperations, final judging result is for determining that described mandate frequency spectrum is idle frequency spectrum.
It should be noted that, above-mentioned employing K/N fusion criterion is only citing.In practical application, the existing any fusion criterion of prior art can be adopted.
S104: the cognition wireless electrical nodes described final judging result determined being sent to described first cognition wireless electrical nodes and at least one cooperation, to make it according to the described final judging result determined, determines whether at the enterprising Serial Communication of described mandate frequency spectrum.
Concrete example as: mandate frequency spectrum as described in determining according to step S103 is idle frequency spectrum, determine that described mandate frequency spectrum is cognition wireless electrical nodes A, B, C that the final judging result of idle frequency spectrum sends to described first cognition wireless electrical nodes and three cooperations by described, to make cognition wireless electrical nodes A, B, C of described first cognition wireless electrical nodes and three cooperations go to determine whether at the enterprising Serial Communication of described mandate frequency spectrum, suppose that the first cognition wireless electrical nodes is determined at the enterprising Serial Communication of described mandate frequency spectrum.
The application embodiment of the present invention, denoising thoroughly can be compared to the signal of the low signal-to-noise ratio that cognition wireless electrical nodes receives, improve the low signal-to-noise ratio of signal, the accuracy that this locality of each cognition wireless electrical nodes is adjudicated improves, fusion treatment is being carried out for follow-up, the accuracy obtaining final court verdict also promotes a lot, make the detection of idle frequency spectrum more accurate, make cognition wireless electrical nodes can at the enterprising Serial Communication of idle frequency spectrum, do not affect the communication of primary user simultaneously, be interfered when avoiding primary user's use authority frequency spectrum.
The schematic flow sheet of the method for the another kind of idle frequency spectrum detection that Fig. 2 provides for the embodiment of the present invention, comprises the steps:
S201: obtain own location information.
According to prior art, cognition wireless electrical nodes can obtain himself positional information, no longer repeats at this.
S202: after Wavelet Denoising Method is carried out to mandate spectrum signal, carry out energy measuring, obtain local discriminative information.
In practical communication environment; usually can because there is the phenomenon of fading information in shade and transmitting procedure in radio signal; thus cause cognition wireless electrical nodes low signal-to-noise ratio when Received signal strength very low; cognition wireless electrical nodes will be affected like this according to the signal received; whether judgement authorizes frequency spectrum to be that the probability of miscarriage of justice of idle frequency spectrum can increase; so for carrying out the follow-up local discriminative information according to each cognition wireless electrical nodes; when carrying out fusion treatment; the accuracy of final court verdict also can be not too accurate
So cognition wireless electrical nodes carry out this locality judgement before, denoising is carried out to signal, improve cognition wireless electrical nodes Received signal strength time low signal-to-noise ratio, to reduce probability of miscarriage of justice, be very feasible.According to prior art, when carrying out spectrum detection, be actually the detection to signal energy.
Concrete, the local discriminative information of described acquisition, comprising:
The mandate spectrum signal that cognition wireless electrical nodes receives according to it, carry out energy measuring, wherein, described mandate spectrum signal comprises: by the signal of noise pollution, described energy measuring comprises: by the signal of noise pollution through Wavelet Denoising Method, obtain estimated signal, then judge whether estimated signal is 0
If judged result is estimated signal is 0, then cognition wireless electrical nodes determines that described mandate frequency spectrum does not exist primary user, determines that described mandate frequency spectrum is idle frequency spectrum,
If judged result is estimated signal is not 0, then described estimated signal is after analog-to-digital conversion, squarer and sampling summation, and obtain detection statistic, cognition wireless electrical nodes determines its local discriminative information according to described detection statistic;
Described Wavelet Denoising Method comprises: by described by the signal map of noise pollution to wavelet field, generate band wavelet coefficient small echo signal, arrange mask operator, with the coefficient entry making small echo signal only retain default wavelet coefficient, other wavelet coefficients are set to 0.
Concrete example as: the signal obtained after supposing to carry out Wavelet Denoising Method is estimated signal f ' (n), what receive is s (n)=f (n)+σ e (n) by the signal of noise pollution, wherein, s (n) is by the signal of noise pollution, the signal that f (n) sends for primary user base station, e (n) is noise, and σ is noise intensity.In the ideal situation, can filtering noise completely, if there is primary user and H
1, then f ' (n)=f (n) is had, if there is not primary user and H
0, then f ' (n)=0 is had.Namely judge whether estimated signal f ' (n) is 0, if judged result is estimated signal f ' (n) is 0, then cognition wireless electrical nodes determines that described mandate frequency spectrum does not exist primary user, determines that described mandate frequency spectrum is idle frequency spectrum; If judged result is estimated signal f ' (n) is not 0, then described estimated signal is after analog-to-digital conversion, squarer and sampling summation, obtain detection statistic, cognition wireless electrical nodes determines its local discriminative information according to described detection statistic, and wherein detecting statistic can be expressed as
Wherein,
represent that the degree of freedom is the center χ side distribution of 2TW,
the expression degree of freedom is 2TW, the non-central χ side distribution of non-centrality parameter 2 γ, and γ is signal to noise ratio, and TW represents the product of sample time and sampling band bandwidth.
Wavelet Denoising Method process comprises: be mapped to wavelet field by by signal s (n) of noise pollution, generates the small echo signal of band wavelet coefficient, can arrange mask operator B
c, with the coefficient entry making small echo signal only retain default wavelet coefficient, other wavelet coefficients are set to 0, can be expressed as:
Wherein, Q represents default wavelet coefficient, c
m,nrepresent that single wavelet systems is several.
Certainly, be mapped to wavelet field by by signal s (n) of noise pollution, generate the small echo signal of band wavelet coefficient, modulus value threshold value Y can also be set
c, the wavelet coefficient making modulus value little is set to 0, and the wavelet systems only retaining modulus value large is several, namely
Wherein, δ represents the modulus value threshold value of setting.
Concrete, described cognition wireless electrical nodes determines its local discriminative information according to described detection statistic, comprising:
Described detection statistic and the threshold value preset are compared, the threshold value preset described in if described detection statistic is greater than, then cognition wireless electrical nodes determines that described mandate frequency spectrum exists primary user, determine that described mandate frequency spectrum is busy frequency spectrum, the threshold value preset described in if described detection statistic is less than or equal to, there is not primary user in the mandate frequency spectrum that then cognition wireless electrical nodes determines described perception, determine that described mandate frequency spectrum is idle frequency spectrum.
Concrete example as, obtain detecting statistic S according to above-mentioned steps, compare with the threshold value λ preset, if have detection statistic S be greater than described in the threshold value λ that presets, i.e. S > λ, then cognition wireless electrical nodes determines that described mandate frequency spectrum exists primary user, determine that described mandate frequency spectrum is busy frequency spectrum, if have detection statistic S be less than or equal to described in the threshold value λ that presets, i.e. S≤λ, there is not primary user in the mandate frequency spectrum that then cognition wireless electrical nodes determines described perception, determine that described mandate frequency spectrum is idle frequency spectrum.
S203: positional information and described local discriminative information are sent to network side; To make network side carry out fusion treatment, determine final judging result, the described final judging result determined is sent to the cognition wireless electrical nodes of described cognition wireless electrical nodes and at least one cooperation.
Concrete example as: cognition wireless electrical nodes is obtained from the positional information of body, and its mandate spectrum signal received according to self, make local judgement, the positional information of self obtained and local court verdict are sent to network side, network side determines at least one cooperative cognitive radio node according to the positional information of cognition wireless electrical nodes, and receive the local court verdict of at least one cooperative cognitive radio node, the local court verdict of fusion treatment cognition wireless electrical nodes and at least one cooperative cognitive radio node, determine final judging result, the most described whole court verdict is sent to cognition wireless electrical nodes and at least one cooperative cognitive radio node.
S204: receive the final judging result that network side sends.
S205: according to the described final judging result determined, determines whether at the enterprising Serial Communication of described mandate frequency spectrum.
Such as: the final judging result that cognition wireless electrical nodes sends according to network side, determine whether at the enterprising Serial Communication of described mandate frequency spectrum, when final judging result is that described mandate frequency spectrum exists authorized user, namely described mandate frequency spectrum is busy frequency spectrum, then cognition wireless electrical nodes can be selected at the enterprising Serial Communication of described mandate frequency spectrum scarcely; When final judging result is that described mandate frequency spectrum does not exist authorized user, namely described mandate frequency spectrum is idle frequency spectrum, and cognition wireless electrical nodes can be selected at the enterprising Serial Communication of described mandate frequency spectrum, also can select not at the enterprising Serial Communication of described mandate frequency spectrum.
Concrete, described method also comprises:
In the enterprising Serial Communication process of described mandate frequency spectrum, send own location information and local court verdict to network side in real time; The final judging result sent when the network side received represents that described mandate frequency spectrum is taken by primary user, then stop using described mandate frequency spectrum to communicate.
Suppose that cognition wireless electrical nodes has determined idle frequency spectrum P, and the enterprising Serial Communication of described idle frequency spectrum P, now, cognition wireless electrical nodes is not also stopping to receive the signal of authorizing frequency spectrum P, the primary user detecting frequency spectrum P is gone whether to use described mandate frequency spectrum P to communicate, and by described result of detection and the positional information of himself, send to network side in real time, network side carries out amalgamation judging, the final judging result receiving network side when cognition wireless electrical nodes represents that described mandate frequency spectrum P is taken by primary user, then cognition wireless electrical nodes stops using described mandate frequency spectrum P to communicate.
Application drawing 2 inventive embodiments, can be real-time mandate frequency spectrum be adjudicated, determine whether it exists primary user, whether be idle frequency spectrum, ensure that cognition wireless electrical nodes is when the enterprising Serial Communication of idle frequency spectrum, does not affect the communication of primary user, when primary user's use authority frequency spectrum communicates, cognition wireless electrical nodes stops using mandate frequency spectrum, ensure that the proper communication of primary user.
The structural representation of the device of a kind of idle frequency spectrum detection that Fig. 3 provides for the embodiment of the present invention, corresponding with flow process shown in Fig. 1, be applied to network side, described device comprises: request receiving module 301, first determination module 302, discriminative information determination module 303 and court verdict sending module 304
Request receiving module 301: whether the detection mandate frequency spectrum sent for receiving the first cognition wireless electrical nodes is the request of idle frequency spectrum, and described request comprises: the positional information of described first cognition wireless electrical nodes and local discriminative information; Described local discriminative information is after to be the first cognition wireless electrical nodes carry out Wavelet Denoising Method to mandate spectrum signal, carries out energy measuring acquisition.
First determination module 302: for the positional information according to described first cognition wireless electrical nodes, determine at least one cooperative cognitive radio node.
Discriminative information determination module 303: for the local discriminative information according to described first cognition wireless electrical nodes, the local discriminative information that at least one the cooperative cognitive radio node received sends, select the fusion criterion that default, according to the local discriminative information of the first cognition wireless electrical nodes received described in selected fusion criterion process and the local discriminative information of the cognition wireless electrical nodes of at least one cooperation, determine final judging result, described final judging result comprises determines whether described mandate frequency spectrum is idle frequency spectrum.
Court verdict sending module 304: for the described final judging result determined being sent to the cognition wireless electrical nodes of described first cognition wireless electrical nodes and at least one cooperation, to make it according to the described final judging result determined, determine whether at the enterprising Serial Communication of described mandate frequency spectrum.
Inventive embodiments shown in application drawing 3, denoising thoroughly can be compared to the signal of the low signal-to-noise ratio that cognition wireless electrical nodes receives, improve the low signal-to-noise ratio of signal, the accuracy that this locality of each cognition wireless electrical nodes is adjudicated improves, fusion treatment is being carried out for follow-up, the accuracy obtaining final court verdict also promotes a lot, make the detection of idle frequency spectrum more accurate, make cognition wireless electrical nodes can at the enterprising Serial Communication of idle frequency spectrum, do not affect the communication of primary user simultaneously, be interfered when avoiding primary user's use authority frequency spectrum.
For device embodiment, because it is substantially similar to embodiment of the method, so description is fairly simple, relevant part illustrates see the part of embodiment of the method.
The structural representation of the device of the another kind of idle frequency spectrum detection that Fig. 4 provides for the embodiment of the present invention, corresponding with flow process shown in Fig. 2, be applied to cognition wireless electrical nodes, described device comprises: position information acquisition module 401, local judging module 402, information sending module 403, conclusive judgement information receiving module 404 and the second determination module 405
Position information acquisition module 401: for obtaining own location information.
Local judging module 402: after Wavelet Denoising Method is carried out to mandate spectrum signal, carry out energy measuring, obtain local discriminative information.
Concrete, described local judging module, specifically for:
The mandate spectrum signal that cognition wireless electrical nodes receives according to it, carry out energy measuring, wherein, described mandate spectrum signal comprises: by the signal of noise pollution, described energy measuring comprises: by the signal of noise pollution through Wavelet Denoising Method, obtain estimated signal, then judge whether estimated signal is 0
If judged result is estimated signal is 0, then cognition wireless electrical nodes determines that described mandate frequency spectrum does not exist primary user, determines that described mandate frequency spectrum is idle frequency spectrum,
If judged result is estimated signal is not 0, then described estimated signal is after analog-to-digital conversion, squarer and sampling summation, and obtain detection statistic, cognition wireless electrical nodes determines its local discriminative information according to described detection statistic;
Described Wavelet Denoising Method comprises: by described by the signal map of noise pollution to wavelet field, generate band wavelet coefficient small echo signal, arrange mask operator, with the coefficient entry making small echo signal only retain default wavelet coefficient, other wavelet coefficients are set to 0.
Concrete, when described local judging module determines its local discriminative information according to described detection statistic:
Described detection statistic and the threshold value preset are compared, the threshold value preset described in if described detection statistic is greater than, then cognition wireless electrical nodes determines that described mandate frequency spectrum exists primary user, determine that described mandate frequency spectrum is busy frequency spectrum, the threshold value preset described in if described detection statistic is less than or equal to, there is not primary user in the mandate frequency spectrum that then cognition wireless electrical nodes determines described perception, determine that described mandate frequency spectrum is idle frequency spectrum.
Information sending module 403: for positional information and described local discriminative information are sent to network side; To make network side carry out fusion treatment, determine final judging result, the described final judging result determined is sent to the cognition wireless electrical nodes of described cognition wireless electrical nodes and at least one cooperation.
Conclusive judgement information receiving module 404: for receiving the final judging result that network side sends.
Second determination module 405: for according to the described final judging result determined, determine whether at the enterprising Serial Communication of described mandate frequency spectrum.
Concrete, described information sending module also for: in the enterprising Serial Communication process of described mandate frequency spectrum, send own location information and local court verdict to network side in real time;
Described device also comprises stops using module (not marking in figure), described stop using module specifically for: when receive network side send final judging result represent that described mandate frequency spectrum is taken by primary user, then stop using described mandate frequency spectrum to communicate.
Application drawing 4 inventive embodiments, can be real-time mandate frequency spectrum be adjudicated, determine whether it exists primary user, whether be idle frequency spectrum, ensure that cognition wireless electrical nodes is when the enterprising Serial Communication of idle frequency spectrum, does not affect the communication of primary user, when primary user's use authority frequency spectrum communicates, cognition wireless electrical nodes stops using mandate frequency spectrum, ensure that the proper communication of primary user.
For device embodiment, because it is substantially similar to embodiment of the method, so description is fairly simple, relevant part illustrates see the part of embodiment of the method.
It should be noted that, in this article, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
One of ordinary skill in the art will appreciate that all or part of step realized in said method execution mode is that the hardware that can carry out instruction relevant by program has come, described program can be stored in computer read/write memory medium, here the alleged storage medium obtained, as: ROM/RAM, magnetic disc, CD etc.
Each embodiment in this specification all adopts relevant mode to describe, between each embodiment identical similar part mutually see, what each embodiment stressed is the difference with other embodiments.Especially, for system embodiment, because it is substantially similar to embodiment of the method, so description is fairly simple, relevant part illustrates see the part of embodiment of the method.
The foregoing is only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.All any amendments done within the spirit and principles in the present invention, equivalent replacement, improvement etc., be all included in protection scope of the present invention.
Claims (10)
1. a method for idle frequency spectrum detection, it is characterized in that, be applied to network side, described method comprises step:
Receive the request whether detection mandate frequency spectrum that the first cognition wireless electrical nodes sends is idle frequency spectrum, described request comprises: the positional information of described first cognition wireless electrical nodes and local discriminative information; Described local discriminative information is after to be the first cognition wireless electrical nodes carry out Wavelet Denoising Method to mandate spectrum signal, carries out energy measuring acquisition;
According to the positional information of described first cognition wireless electrical nodes, determine at least one cooperative cognitive radio node;
According to the local discriminative information of described first cognition wireless electrical nodes, the local discriminative information that at least one the cooperative cognitive radio node received sends, select the fusion criterion that default, according to the local discriminative information of the first cognition wireless electrical nodes received described in selected fusion criterion process and the local discriminative information of the cognition wireless electrical nodes of at least one cooperation, determine final judging result, described final judging result comprises determines whether described mandate frequency spectrum is idle frequency spectrum;
The described final judging result determined is sent to the cognition wireless electrical nodes of described first cognition wireless electrical nodes and at least one cooperation, to make it according to the described final judging result determined, determine whether at the enterprising Serial Communication of described mandate frequency spectrum.
2. a method for idle frequency spectrum detection, it is characterized in that, be applied to cognition wireless electrical nodes, described method comprises step:
Obtain own location information;
After Wavelet Denoising Method is carried out to mandate spectrum signal, carry out energy measuring, obtain local discriminative information;
Positional information and described local discriminative information are sent to network side; With the cognition wireless electrical nodes making network side send to described cognition wireless electrical nodes to cooperate with at least one the described final judging result determined by step according to claim 1;
Receive the final judging result that network side sends;
According to the described final judging result determined, determine whether at the enterprising Serial Communication of described mandate frequency spectrum.
3. method according to claim 2, is characterized in that, the local discriminative information of described acquisition, comprising:
The mandate spectrum signal that cognition wireless electrical nodes receives according to it, carry out energy measuring, wherein, described mandate spectrum signal comprises: by the signal of noise pollution, described energy measuring comprises: by the signal of noise pollution through Wavelet Denoising Method, obtain estimated signal, then judge whether estimated signal is 0
If judged result is estimated signal is 0, then cognition wireless electrical nodes determines that described mandate frequency spectrum does not exist primary user, determines that described mandate frequency spectrum is idle frequency spectrum,
If judged result is estimated signal is not 0, then described estimated signal is after analog-to-digital conversion, squarer and sampling summation, and obtain detection statistic, cognition wireless electrical nodes determines its local discriminative information according to described detection statistic;
Described Wavelet Denoising Method comprises: by described by the signal map of noise pollution to wavelet field, generate band wavelet coefficient small echo signal, arrange mask operator, with the coefficient entry making small echo signal only retain default wavelet coefficient, other wavelet coefficients are set to 0.
4. method according to claim 3, is characterized in that, described cognition wireless electrical nodes determines its local discriminative information according to described detection statistic, comprising:
Described detection statistic and the threshold value preset are compared, the threshold value preset described in if described detection statistic is greater than, then cognition wireless electrical nodes determines that described mandate frequency spectrum exists primary user, determine that described mandate frequency spectrum is busy frequency spectrum, the threshold value preset described in if described detection statistic is less than or equal to, there is not primary user in the mandate frequency spectrum that then cognition wireless electrical nodes determines described perception, determine that described mandate frequency spectrum is idle frequency spectrum.
5. method according to claim 2, is characterized in that, described method also comprises:
Cognition wireless electrical nodes, in the enterprising Serial Communication process of described mandate frequency spectrum, sends own location information and local court verdict to network side in real time; The final judging result sent when the network side received represents that described mandate frequency spectrum is taken by primary user, then stop using described mandate frequency spectrum to communicate.
6. a device for idle frequency spectrum detection, it is characterized in that, be applied to network side, described device comprises:
Request receiving module: whether the detection mandate frequency spectrum sent for receiving the first cognition wireless electrical nodes is the request of idle frequency spectrum, and described request comprises: the positional information of described first cognition wireless electrical nodes and local discriminative information; Described local discriminative information is after to be the first cognition wireless electrical nodes carry out Wavelet Denoising Method to mandate spectrum signal, carries out energy measuring acquisition;
First determination module: for the positional information according to described first cognition wireless electrical nodes, determine at least one cooperative cognitive radio node;
Discriminative information determination module: for the local discriminative information according to described first cognition wireless electrical nodes, the local discriminative information that at least one the cooperative cognitive radio node received sends, select the fusion criterion that default, according to the local discriminative information of the first cognition wireless electrical nodes received described in selected fusion criterion process and the local discriminative information of the cognition wireless electrical nodes of at least one cooperation, determine final judging result, described final judging result comprises determines whether described mandate frequency spectrum is idle frequency spectrum;
Court verdict sending module: for the described final judging result determined being sent to the cognition wireless electrical nodes of described first cognition wireless electrical nodes and at least one cooperation, to make it according to the described final judging result determined, determine whether at the enterprising Serial Communication of described mandate frequency spectrum.
7. a device for idle frequency spectrum detection, it is characterized in that, be applied to cognition wireless electrical nodes, described device comprises:
Position information acquisition module: for obtaining own location information;
Local judging module: after Wavelet Denoising Method is carried out to mandate spectrum signal, carry out energy measuring, obtain local discriminative information;
Information sending module: for positional information and described local discriminative information are sent to network side; With the cognition wireless electrical nodes making network side send to described cognition wireless electrical nodes to cooperate with at least one the described final judging result determined by step according to claim 1;
Conclusive judgement information receiving module: for receiving the final judging result that network side sends;
Second determination module: for according to the described final judging result determined, determine whether at the enterprising Serial Communication of described mandate frequency spectrum.
8. device according to claim 7, is characterized in that, described local judging module, specifically for:
The mandate spectrum signal that cognition wireless electrical nodes receives according to it, carry out energy measuring, wherein, described mandate spectrum signal comprises: by the signal of noise pollution, described energy measuring comprises: by the signal of noise pollution through Wavelet Denoising Method, obtain estimated signal, then judge whether estimated signal is 0
If judged result is estimated signal is 0, then cognition wireless electrical nodes determines that described mandate frequency spectrum does not exist primary user, determines that described mandate frequency spectrum is idle frequency spectrum,
If judged result is estimated signal is not 0, then described estimated signal is after analog-to-digital conversion, squarer and sampling summation, and obtain detection statistic, cognition wireless electrical nodes determines its local discriminative information according to described detection statistic;
Described Wavelet Denoising Method comprises: by described by the signal map of noise pollution to wavelet field, generate band wavelet coefficient small echo signal, arrange mask operator, with the coefficient entry making small echo signal only retain default wavelet coefficient, other wavelet coefficients are set to 0.
9. device according to claim 8, is characterized in that, when described local judging module determines its local discriminative information according to described detection statistic:
Described detection statistic and the threshold value preset are compared, the threshold value preset described in if described detection statistic is greater than, then cognition wireless electrical nodes determines that described mandate frequency spectrum exists primary user, determine that described mandate frequency spectrum is busy frequency spectrum, the threshold value preset described in if described detection statistic is less than or equal to, there is not primary user in the mandate frequency spectrum that then cognition wireless electrical nodes determines described perception, determine that described mandate frequency spectrum is idle frequency spectrum.
10. device according to claim 7, is characterized in that, described information sending module also for: in the enterprising Serial Communication process of described mandate frequency spectrum, send own location information and local court verdict to network side in real time;
Described device also comprises stops using module, described in stop using module specifically for: when receive network side send final judging result represent that described mandate frequency spectrum is taken by primary user, then stop using described mandate frequency spectrum to communicate.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106911410A (en) * | 2017-05-02 | 2017-06-30 | 广东工业大学 | One kind communication primary user's cognitive method and system |
| CN107171751A (en) * | 2017-05-12 | 2017-09-15 | 广东工业大学 | One kind communication primary user's cognitive method and system |
| CN110267275A (en) * | 2019-06-17 | 2019-09-20 | 深圳前海达闼云端智能科技有限公司 | Frequency spectrum detection system and method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101686473A (en) * | 2008-09-28 | 2010-03-31 | 华为技术有限公司 | Cognitive radio system and method and base station for detecting frequency spectrum thereof |
| CN103178910A (en) * | 2013-02-27 | 2013-06-26 | 浙江大学 | Credibility based cognitive radio network stratified cooperative spectrum sensing method |
| US20130273833A1 (en) * | 2012-01-16 | 2013-10-17 | Kabushiki Kaisha Toshiba | Enhancing the reliability of spectrum sensing with partial soft information feedback in a cognitive relay network |
-
2015
- 2015-09-30 CN CN201510639556.XA patent/CN105187142A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101686473A (en) * | 2008-09-28 | 2010-03-31 | 华为技术有限公司 | Cognitive radio system and method and base station for detecting frequency spectrum thereof |
| US20130273833A1 (en) * | 2012-01-16 | 2013-10-17 | Kabushiki Kaisha Toshiba | Enhancing the reliability of spectrum sensing with partial soft information feedback in a cognitive relay network |
| CN103178910A (en) * | 2013-02-27 | 2013-06-26 | 浙江大学 | Credibility based cognitive radio network stratified cooperative spectrum sensing method |
Non-Patent Citations (1)
| Title |
|---|
| 曾文娟，谢显中: ""基于小波去噪的协作空闲频谱检测性能"", 《吉林大学学报（信息科学版）》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106911410A (en) * | 2017-05-02 | 2017-06-30 | 广东工业大学 | One kind communication primary user's cognitive method and system |
| CN107171751A (en) * | 2017-05-12 | 2017-09-15 | 广东工业大学 | One kind communication primary user's cognitive method and system |
| CN110267275A (en) * | 2019-06-17 | 2019-09-20 | 深圳前海达闼云端智能科技有限公司 | Frequency spectrum detection system and method |
| CN110267275B (en) * | 2019-06-17 | 2024-01-09 | 达闼机器人股份有限公司 | Spectrum detection system and method |
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