CN101136655B - Space diversity based authorization user signal detecting method - Google Patents
Space diversity based authorization user signal detecting method Download PDFInfo
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Abstract
This invention relates to a test method for authorized user signals based on variety of space including five steps: each perception terminal of a perception region samples authorized signals periodically and independently and then transforms wavelets in multiple sizes to a sample signal sequence to judge the transformation result by judgers for different sizes and finally a correlator judges if the authorization signal appears or not independently, which utilizes the variety of perception terminals distributed in space and access points of sub-areas to collect the judgment results and execute the decision, which is finished by the correlator, and the access point broadcasts the test result, if it finds out that the authorized user begins using the band, the perception users should give up the use of the band, if not, they can use it continuously.
Description
Technical field
The present invention has utilized the diversity of cognitive radio electric terminals spatial distribution, can detect the technology of jump signal in each terminal based on wavelet analysis, is applied to the detection of authorization user signal in the cognitive radio network.
Background technology
Cognitive radio is the radio communication notion and the technology of rising in recent years, it can the present communication environment of perception in all frequency spectrums use chance.In other words, by reorganization Radio Network System framework, make the cognitive radio network have intelligent identification and the ability that changes frequency spectrum use chance.This of cognitive radio network can reset the regroup of its networking, can be according to the network architecture, Radio Resource, communication setting etc., the spectrum opportunities that perceives is carried out the optimization utilization, thereby cognitive radio is always with multiple network collaborative work interwoveness.All signs show that all the cognitive radio network will become the following new development that possesses high frequency spectrum service efficiency.Cognitive radio allows to carry out the frequency band of multidimensional in theory on time, frequency and space multiplexing, this will reduce greatly because the restriction of frequency spectrum and bandwidth and to the constraint of wireless technology development, and specific Frequency Distribution is had a great difference on special-purpose in the past.
The perception user compares authorized user and has lower frequency spectrum access priority.For authorized user not being caused harmful interference, the perception user needs to detect independently the appearance of idle frequency spectrum and authorized user.This just requires the perception user can intercept frequency spectrum in real time continuously, to improve the reliability that detects.For authorized user is not caused harmful interference.The reliable Detection probability demands reaches 99.9%.Early stage detection method has the energy measuring method of employing and the detection of cyclic stationary process feature etc., but detect the weakening of received signal intensity that performance can cause along with multipath and shadow fading and reduce, detectability itself also has certain restriction in addition, therefore need explore new method for the realization reliable Detection.Present emulation and the analysis showed that: adopt the method for cooperation diversity can reach above-mentioned reliable Detection probability demands.Cooperation is intercepted and is allowed to exchange interception information between a plurality of perception users mutually, and this can significantly improve intercepting of frequency spectrum and detectability.So necessary method that works out a kind of distributed high detection performance.
Summary of the invention
Technical problem: the objective of the invention is provides a kind of method that detects authorization user signal in the cognitive radio network, this method can satisfy the detection requirement, and can be used for detecting faint authorization user signal.
Technical scheme: the present invention is a kind of detection method based on the multifarious authorization user signal in space, and it comprises three processes: received signal series processing process, collect and carry out decision process and broadcasting testing result process.
Of the present inventionly Distributed Detection is combined with centralized decision based on the multifarious authorization signal detection method in space, at first each perception terminal by the perception subregion carries out distributed sample to authorization signal, after then sampled signal being carried out independent process, at last collect the result of each perception terminal by access point and carry out decision-making and judge whether authorization signal occurs, this method comprises following 5 processes and is undertaken by described order:
1) periodic sampling process: each perception terminal of perception subregion carries out periodic sampling independently to authorization signal,
2) wavelet transform process process: each perception terminal utilizes wavelet transformer that sample sequence is carried out multi-scale wavelet transformation, and different threshold values is set under each yardstick comes the result behind the wavelet transformation is adjudicated, the output result of the decision device under each yardstick enter with device with, and output result
3) collect and carry out decision process: the access point of perception subregion to the result of each perception terminal collect and be input to device with, carry out at last to make a strategic decision to judge whether authorization signal occurs,
4) broadcasting testing result process: whether access point is broadcasted testing result and is occurred to notify each perception terminal authorization signal in the perception subregion,
5) carry out the testing result process: perception terminal receives the testing result of access point and carries out corresponding action; Occur promptly bringing into use this frequency band if detect authorized user, each perception user will abdicate the right to use of frequency band, not have authorized user to use this frequency band if detect, and the perception user can continue to use this frequency band.
Described wavelet transform process process, after each perception terminal that it comprises the perception subregion carries out distributed sample to authorization signal, carry out multi-scale wavelet transformation then, utilize the decision device under each yardstick that transformation results is adjudicated, at last by each perception terminal with device to the court verdict under each yardstick carry out with, whether the appearance of authorization signal is carried out independent judgement.
Collect and carry out decision process and comprise the diversity of utilizing the perception terminal spatial distribution, decision process is collected and carried out to the access point of perception subregion to the court verdict of each perception terminal, and wherein, decision process is by finishing with device.
In the broadcasting testing result process, access point is broadcasted the result of decision in the perception subregion, bring into use this frequency band if detect authorized user, and each perception user will abdicate the right to use of frequency band, do not have authorized user to use this frequency band if detect, the perception user can continue to use this frequency band.
Each perception terminal is provided with different threshold values and comes the result behind the wavelet transformation is adjudicated under each yardstick, the output result of the decision device under each yardstick enter with device with adjudicate, in order to reduce The noise, employing with some less threshold values, keeps those mould values greater than threshold value on each yardstick.
Beneficial effect: the detection method that the present invention proposes authorization user signal in the cognitive radio network.Advantage is a diversity of having utilized the perception terminal spatial distribution, has reduced the influence of multipath and decline, has improved the performance that detects.And utilized the multi-scale wavelet transformation detection method in each terminal, and can be used for detecting more faint authorization user signal, satisfy and detect performance demands.
Description of drawings
Fig. 1 is the mutant form schematic diagram of authorization user signal.
Fig. 2 is that the local maximum point of local convolution concerns schematic diagram with sign mutation point.
Fig. 3 is a quadratic spline scaling function schematic diagram.
Fig. 4 is a quadratic spline wavelet function schematic diagram.
Fig. 5 is the variation schematic diagrames of 2 spline wavelets conversion moulds of authorization signal with yardstick.
Fig. 6 is a perception terminal signal detector block diagram.
Fig. 7 is distributed aware scheme schematic diagram.Wherein, Fig. 7 (a) is detection, collection and decision process; Fig. 7 (b) is a broadcasting process.
Fig. 8 is based on space multifarious authorization user signal detector block diagram.
Embodiment
The present invention is based on the multifarious authorization signal detection method in space combines Distributed Detection with centralized decision, at first each perception terminal by the perception subregion carries out distributed sample to authorization signal, after then sampled signal being carried out independent process, at last collect the result of each perception terminal by access point and carry out decision-making and judge whether authorization signal occurs, this method comprises following 5 processes and is undertaken by described order:
1) periodic sampling process: each perception terminal of perception subregion carries out periodic sampling independently to authorization signal,
2) wavelet transform process process: each perception terminal utilizes wavelet transformer that sample sequence is carried out multi-scale wavelet transformation, and different threshold values is set under each yardstick comes the result behind the wavelet transformation is adjudicated, the output result of the decision device under each yardstick enter with device with, and output result
3) collect and carry out decision process: the access point of perception subregion to the result of each perception terminal collect and be input to device with, carry out at last to make a strategic decision to judge whether authorization signal occurs,
4) broadcasting testing result process: whether access point is broadcasted testing result and is occurred to notify each perception terminal authorization signal in the perception subregion,
5) carry out the testing result process: perception terminal receives the testing result of access point and carries out corresponding action; Occur promptly bringing into use this frequency band if detect authorized user, each perception user will abdicate the right to use of frequency band, not have authorized user to use this frequency band if detect, and the perception user can continue to use this frequency band.
The sudden change of authorization user signal can show as two kinds of forms: a kind of is from having to nothing, and another kind is by not having to having.The performance of sign mutation has locality, and authorization user signal and catastrophe point can be regarded as about sudden change central point part odd symmetric.If (wavelet function may be local odd symmetric form with a wavelet function at perception terminal, also may be the form of local even symmetry) authorization signal is made convolution, and near the subrange of the sudden change central point, observe convolution results, the sudden change feature that convolution results can the expression mutation signal as can be known.And, in order to reduce The noise, can adopt on each yardstick with some less threshold values, keep those mould values greater than threshold value.Because noise jamming can be disturbed the accurate position of retrieval, the retrieval point during more a plurality of yardstick could be anti-interference.Therefore only at multiple dimensioned wavelet transformation module maximum down all greater than threshold value, decision signal suddenlys change exactly.
The weakening of received signal intensity that causes owing to multipath and shadow fading reduces, and fails to judge or judges by accident if judge with a perception terminal whether the appearance of authorized user can cause separately.According to the diversity of portable terminal spatial distribution, proposed a kind ofly based on the multifarious detection method in space, promptly all terminals of perception subregion all participate in the detection of authorization signal, and this method can overcome multipath and shadow fading.Each perception terminal detects authorized user, and decision process is collected and carried out to access point to each testing result.
The access point broadcasting result of decision is brought into use this frequency band if detect authorized user, and each perception user will abdicate the right to use of frequency band, not have authorized user to use this frequency band if detect, and the perception user can continue to use this frequency band.
In conjunction with the accompanying drawings, the present invention program is designed work further concrete analysis and description.
(1) wavelet analysis is used for the detection of authorization user signal
For making the perception user not cause harmful interference to authorized user, the perception user needs to detect idle frequency spectrum independently and authorized user ground occurs.Suppose that p is arranged in the sensory perceptual system (p=1,2 ..., K) individual perception terminal, each terminal is carried out periodic sampling to authorization user signal and is detected, and uses r
P1, r
P2..., r
PNRepresent that p terminal at N different sample sequence constantly, then can represent with following hypothesis the detection problem of authorization user signal:
H
0Expression does not have authorization user signal, H
1Expression has authorization user signal.N wherein
PiRepresent that p perception terminal is at i sampling noiset constantly, S
iExpression is the normalized value of the authorization user signal of i constantly, stochastic variable A
pBe a nonnegative real number, embodied the attenuation effect of authorization user signal on p channel.But it is, therefore irrelevant with sampling instant i because decay slowly, it has been generally acknowledged that the amplitude of signal is constant in observing at interval.
The sudden change of authorization user signal can show as two kinds of forms: a kind of is from having to nothing, and another kind is by not having to having, and this mutation process can be represented with Fig. 1.The performance of sign mutation has locality, as shown in Figure 1, authorization user signal and catastrophe point can be regarded as about sudden change central point part odd symmetric, if (wavelet function may be local odd symmetric form with a wavelet function, also may be the form of local even symmetry) respectively two kinds of local jump signals shown in Figure 1 are made convolution, and observe convolution results near the subrange the sudden change central point, following rule is then arranged:
Local strange * local strange=local idol
Local even * local strange=local strange
Now local signal and convolution effect are illustrated among Fig. 2.
As can be seen from Figure 2, convolution results can show the sudden change feature of jump signal shown in Figure 1.Because it also is a kind of convolution form that the inner product of wavelet transformation forms, the local symmetry of wavelet function and the band general character make wavelet function can show the part sudden change feature of jump signal as shown in Figure 1.And, adopt multi-scale wavelet transformation in order to reduce the influence of noise and decay, on a plurality of yardsticks, do comprehensive observing and judgement.Adopting scaling function is quadratic spline, promptly
(as Fig. 3) and quadratic spline wavelet function, i.e. ψ (t)
(as Fig. 4) carries out wavelet transformation to authorization user signal.Suppose that the signal that will detect is r (t), then the wavelet transformation module maximum that carries out gained after the conversion with above-mentioned small echo with the variation of yardstick as shown in Figure 5.
In order to reduce The noise, can adopt on each yardstick with some less threshold value ε, keep those those mould values greater than ε, and only the wavelet transformation module maximum under multiple dimensioned all greater than threshold value, decision signal sudden change exactly.Because noise jamming can be disturbed the accurate position of retrieval, the retrieval point during more a plurality of yardstick could be anti-interference.Suppose to use | w
jr
p| be illustrated in the modulus maximum point of the wavelet conversion coefficient of retrieving on the j yardstick, if | w
jr
p|＞ε, represent that then authorization signal has sudden change, output high level " 1 ", otherwise, then " 0 ".Then the output signal of the arbiter under each yardstick enter with device with, if with the output signal T of device
pBe high level " 1 ", illustrate that then all detecting signal under each yardstick has sudden change, then can be judged to authorization signal and occur.This process can be with block representation shown in Figure 6.
(2) based on the multifarious Distributed Detection method in space
The weakening of received signal intensity that causes owing to multipath and shadow fading reduces, and judges with a perception terminal whether the appearance of authorized user can cause and fails to judge or judge by accident.Space diversity according to portable terminal distributes has proposed a kind of based on the multifarious detection method in space.By the multifarious detection method in space, the detection performance of system can be improved greatly.Fig. 7 is an application scenarios of this system.Under this scene, each terminal in the access point scope is all carried out frequency spectrum detection.This method can overcome multipath and shadow fading.In (a), each perception user detects authorized user, and decision process is collected and carried out to access point to each testing result; In (b), access point broadcasting testing result is brought into use this frequency band if detect authorized user, and each perception user will abdicate the right to use of frequency band, not have authorized user to use this frequency band if detect, and the perception user can continue to use this frequency band.This testing process can be with shown in Figure 8.
Claims (3)
1. one kind based on the multifarious authorization signal detection method in space, it is characterized in that Distributed Detection combines with centralized decision, at first authorization user signal is sampled by each perception terminal of perception subregion, then sampled signal is carried out independent process, at last collect the result of each perception terminal by access point and carry out decision-making and judge whether authorization user signal occurs, this method comprises following 5 processes and is undertaken by described order:
1) periodic sampling process: each perception terminal of perception subregion carries out periodic sampling independently to authorization user signal,
2) wavelet transform process process: each perception terminal utilizes wavelet transformer that sample sequence is carried out multi-scale wavelet transformation, and different threshold values is set under each yardstick comes the result behind the wavelet transformation is adjudicated, the output result of the decision device under each yardstick enter with device with, and output result
3) collect and carry out decision process: the access point of perception subregion to the result of each perception terminal collect and be input to device with, carry out at last to make a strategic decision to judge whether authorization user signal occurs,
4) broadcasting testing result process: whether access point is broadcasted testing result and is occurred to notify each perception terminal authorization user signal in the perception subregion,
5) carry out the testing result process: perception terminal receives the testing result of access point and carries out corresponding action, if detecting the signal of authorized user occurs, each perception terminal will be abdicated the right to use of the shared frequency band of this signal, do not have authorization user signal if detect, perception terminal can continue to use this frequency band.
2. as claimed in claim 1 based on the multifarious authorization signal detection method in space, it is characterized in that collecting and carrying out decision process and comprise the diversity of utilizing the perception terminal spatial distribution, decision process is collected and carried out to the access point of perception subregion to the court verdict of each perception terminal, wherein, decision process is by finishing with device.
3. as claimed in claim 1 based on the multifarious authorization signal detection method in space, it is characterized in that each perception terminal is provided with different threshold values and comes the result behind the wavelet transformation is adjudicated under each yardstick, the output result of the decision device under each yardstick enter with device with adjudicate, in order to reduce The noise, employing with some less threshold values, keeps those mould values greater than threshold value on each yardstick.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1832613A (en) * | 2006-04-26 | 2006-09-13 | 电子科技大学 | Parallel frequency spectrum distribution method for preventing interference in cognitive radio system |
| CN1885741A (en) * | 2006-06-26 | 2006-12-27 | 西安交通大学 | Authorization user signal detecting method for cognitive radio system |
| US20070100922A1 (en) * | 2005-11-03 | 2007-05-03 | Samsung Electronics Co., Ltd. | Apparatus and method for signal detection in a cognitive radio-based wireless communication system |
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| US20070100922A1 (en) * | 2005-11-03 | 2007-05-03 | Samsung Electronics Co., Ltd. | Apparatus and method for signal detection in a cognitive radio-based wireless communication system |
| CN1832613A (en) * | 2006-04-26 | 2006-09-13 | 电子科技大学 | Parallel frequency spectrum distribution method for preventing interference in cognitive radio system |
| CN1885741A (en) * | 2006-06-26 | 2006-12-27 | 西安交通大学 | Authorization user signal detecting method for cognitive radio system |
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Assignee: JIANGSU FEITIAN TECHNOLOGY CO., LTD. Assignor: Southeast University Contract record no.: 2011320000158 Denomination of invention: Space diversity based authorization user signal detecting method Granted publication date: 20100915 License type: Exclusive License Open date: 20080305 Record date: 20110304 |
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