CN102413088A - Method and device for coexistence detection - Google Patents
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Abstract
The invention provides a method for coexistence detection of communication systems occupying an identical channel to transmit data, which comprises the following steps that: a first detection statistics is calculated according to a received signal; under the situation that the first detection statistics is less than or equal to a first preset threshold value, the calculation of a second detection statistics is triggered; under the situation that the second detection statistics is less than or equal to a second preset threshold value, a channel is determined not to be occupied, the transmission of valid load data is allowed, and one of the first detection statistics and the second detection statistics is obtained by calculating energy and noise variance of the received signal; and the other one of the first and the second detection statistics is obtained by calculating multiple characteristic values of a sample variance matrix of the received signal. The invention also provides a device for detecting coexistence of communication systems occupying an identical channel to transmit data.
Description
Technical field
The coexistence that the present invention relates in the communication system detects, and more specifically, relates to coexistence detection and input in the IP route for example.
Background technology
60GHz communication is a kind of emerging short-distance wireless communication technology, because its bigger bandwidth of operation (4～7GHz) and can support the gigabit transmission.At present, a plurality of standards of the 60GHz millimeter wave WLAN/Wireless Personal Network (WLAN/WPAN) of various application (for example, IEEE 802.15.3c, WirelessHD and WiGig etc.) have been set up about short haul connection.Therefore, the coexistence detection for the different 60GHz system that takies same frequency band becomes very important.
The coexistence detection method that is used for the 60GHz system at present can be divided into two types.One type is that energy measuring (ED) mode is (referring to H.Urkowits; " Energy detection of unknowndeterministic signals " in Processing of the IEEE; Vol.55; Apr.1967, pp.523-531), another kind of is that the common mode that in IEEE 802.15.3c, defines detects (CMS) scheme.
Energy measuring (ED) becomes the most common signal detection method owing to its simplicity and validity.But traditional ED receives the probabilistic influence of noise, under the low signal-to-noise ratio state, has shown bad detection performance, and this phenomenon is more obvious under the 60GHz channel condition.(referring to M.Park, E.Perahia and M.Gong, " Analysis on IEEE 802.15.3ccoexistence scheme " in IEEE 802.11-09/559r0, May 2009).
CMS relates to complicated control frame PHY/MAC layer to be coordinated, thus in practical application because too complicated, cost very high and be difficult to realize (referring to S.Kato, C.S.Sun; T.Baykas, Z.Lan, J.Wang; R.Funada, M.A.Rahman, C.W.Pyo; H.Harada and I.Lakkis, " Common mode signaling (CMS) for inter-system coexistenceenhancement " in IEEE 802.11-09-370-00-00ad, May 2009).
Therefore, need a kind of coexistence detection mode, can be superior to the traditional E D scheme used in the present 60GHz system, and compare, can reduce the complexity that control frame PHY/MAC layer is coordinated with the CMS scheme.
Summary of the invention
The present invention proposes the new two-stage coexistence detection scheme of a kind of 60GHz of being used for millimeter wave (MMW) WLAN/WPAN.Use energy detector to carry out coarse scanning at first order place.If detect existence from the signal busy channel that communication equipment sent that uses other communication standard, needing then to avoid the equipment of transport payload data to transmit; Otherwise, call second level detector.At place, the second level,, need then to allow the equipment of transport payload data to transmit if detect channel occupancy for empty; Otherwise, avoid the transport payload data.
According to an aspect of the present invention, proposed a kind of method that the communication system that takies same channel transmission data is coexisted and detects, having comprised: calculate first detection statistic according to receiving signal; Be not more than under the situation of first predetermined threshold in said first detection statistic, trigger the calculating of second detection statistic; Be not more than under the situation of second predetermined threshold in said second detection statistic; Confirm that channel is unoccupied; Notice allows the transmission of payload data; Wherein, one of said first detection statistic and said second detection statistic are that energy and noise variance according to said reception signal calculates; And in said first detection statistic and said second detection statistic another is to obtain according to a plurality of eigenvalue calculation to said reception signals sampling covariance matrix.
This method also comprises: under the situation of said first detection statistic greater than said first predetermined threshold, perhaps under the situation of said second detection statistic greater than said second predetermined threshold; Confirm that channel is occupied, send the notice of the transmission of avoiding payload data.
Wherein said first predetermined threshold is set based on the distribution of known false alarm probability and said first detection statistic; And said second predetermined threshold is set based on the distribution of known false alarm probability and said second detection statistic.
The arithmetic average of another in wherein said first detection statistic and said second detection statistic and said a plurality of characteristic values is logarithmic relationship with the ratio of geometric average.
Wherein first detection statistic and the distribution of second detection statistic meet the χ of the different degrees of freedom
2Distribute.
According to a further aspect in the invention; A kind of equipment that the communication system that takies same channel transmission data is coexisted and detects has been proposed; Comprise: first detector, this first detector comprises: first calculation element is used for calculating first detection statistic according to receiving signal; And first judgment device relatively, be used for being not more than under the situation of said first predetermined threshold in said first detection statistic, trigger the calculating of second detection statistic; And second detector, this second detector comprises: second calculation element is used for calculating second detection statistic according to receiving signal; And second judgment device relatively; Be used for being not more than under the situation of second predetermined threshold in said second detection statistic; Confirm that channel is unoccupied; Notice allows the transmission of payload data, and wherein, one of said first detection statistic and said second detection statistic are that energy and the noise variance according to said reception signal calculates; And in said first detection statistic and said second detection statistic another is to obtain according to a plurality of eigenvalue calculation to said reception signals sampling covariance matrix.
Wherein, Said first relatively judgment device under the definite situation of said first detection statistic greater than said first predetermined threshold, or the said second comparison judgment device under the situation of said second detection statistic greater than said second predetermined threshold; Confirm that channel is occupied, send the notice of avoiding the payload data transmission.
Wherein said first predetermined threshold is set based on the distribution of known false alarm probability and said first detection statistic: and said second predetermined threshold is set based on the distribution of known false alarm probability and said second detection statistic.
The arithmetic average of another in wherein said first detection statistic and said second detection statistic and said a plurality of characteristic values is logarithmic relationship with the ratio of geometric average.
Wherein first detection statistic and the distribution of second detection statistic meet the χ of the different degrees of freedom
2Distribute.
The two-stage detection scheme that the present invention proposes is in actual 60GHz channel, and it detects performance and is superior to traditional ED.And from the angle of computation complexity, the two-stage detection scheme that the present invention proposes has reduced the complexity that the PHY/MAC layer of control frame is coordinated significantly than CMS.
Description of drawings
In conjunction with accompanying drawing, above-mentioned and others, feature and advantage of the present invention will become clearer from following detailed description for non-limiting example of the present invention, wherein:
Fig. 1 shows the interference model of 60GHz WLAN/WPAN;
Fig. 2 shows the structured flowchart of two-stage coexistence checkout equipment according to an exemplary embodiment of the present invention; And
Fig. 3 shows the flow chart of two-stage coexistence detection method according to an exemplary embodiment of the present invention.
Embodiment
Below will combine accompanying drawing, exemplary embodiment of the present invention will be described.In this exemplary embodiment, be example with 60GHz WLAN/WPAN system.But those skilled in the art are to be understood that; Scope of the present invention is not limited to this; This exemplary embodiment only is used to describe purpose; Should regard it as example of the present invention but not to any restriction of the present invention, any communication system that is operated in same frequency all is suitable for scheme of the present invention, thereby all falls in protection scope of the present invention.
Fig. 1 shows and can use example communication system 60GHzWLAN/WPAN 100 of the present invention.In this 60GHz WLAN/WPAN 100, exemplarily gone out two WLAN, each WLAN comprises a WLAN controller and a plurality of 60GHz equipment.These two WLAN are operated in identical frequency band, but use different 60GHz standards.For example, WLAN1 uses WiGig, and WLAN2 uses IEEE 802.15.3c.Equipment 2A among the WLAN2 and equipment 2B equipment 1C and the equipment 1D in will WLAN1 produces and disturbs, and interference region has been shown in Fig. 1.Equipment in WLAN1 need be set up before the communication link, and the WPAN1 controller at first scans entire spectrum.Because the equipment work among WLAN1 and the WLAN2 is at identical frequency band; If the WLAN1 controller detects through coexistence and finds that transmission channel is occupied; Needing then to avoid the equipment of transport payload data to transmit, perhaps reschedule this transmission neatly to disturb between minimization system.
Below in conjunction with Fig. 2, the structure of the coexistence of two-stage according to an exemplary embodiment of the present invention checkout equipment is described.
Fig. 2 shows two-stage coexistence checkout equipment 200 according to an exemplary embodiment of the present invention; Comprise energy detector 201 and total blindness's detector 203; Wherein energy detector 201 comprises relatively judgment device 2013 of first calculation element 2011 and first, and total blindness's detector 203 comprises relatively judgment device 2033 of second calculation element 2031 and second.Should be appreciated that for the sake of simplicity with clear, only show the device relevant in the two-stage coexistence checkout equipment 200 among Fig. 2, and omitted description known devices with the present invention.
The coexistence that can be used for the 60GHz system according to two-stage according to the present invention coexistence checkout equipment 200 detects, and no matter is to single carrier (SC) 60GHz system, or multicarrier (for example, OFDM) 60GHz system.Below, with the example that is applied as in OFDM 60GHz system, the process that two-stage coexistence according to the present invention detects is described in conjunction with Fig. 3.
Fig. 3 shows the flow chart of two-stage coexistence detection method 300 according to an exemplary embodiment of the present invention.Suppose H here, for two that are applied in the statistics
0And H
1, H wherein
0There is not the hypothesis from the signal busy channel that communication equipment sent that uses other communication standard in expression; H
1There is the hypothesis of such signal busy channel in expression.
At first, at step S301, first calculation element 2011 that is arranged in the energy detector 201 of the first order calculates corresponding energy measuring statistic T to received signal y
ED
In the OFDM 60GHz system as applying examples, this reception signal y should be vector, supposes in N the independent observation piece of observed time period, to observe y
n, n=0 wherein ..., N-1, each y
nBe the vector of M * 1, they are separate on statistics.Use y
n=[y
n(0) ..., y
n(M-1)]
TRepresent y
nIn M measured value, and have
H
0：y
n＝w
n，n＝0，...，N-1
H
1：y
n＝x
n+w
n，n＝0，...，N-1
That is to say, at H
0Hypothesis under, the signal y that is received
nOnly be the multiple Gaussian noise vector in the system, each component wherein follows that average is zero, variance is σ
2Multiple Gaussian distribution CN (0, σ
2); And at H
1Hypothesis under, the signal y that is received
nBe the multiple Gaussian noise vector and the transmission signal x that will detect in the system
nSum.Here suppose x
nBe the multiple Gauss's vector with zero-mean, its covariance matrix is expressed as R
x=E [x
nx
n H].
Particularly, in step S301, first calculation element 2011 in the energy detector 201 calculates test statistics T according to following formula
ED
Next at step S303, compare judgment device 3013 with the energy test statistics T that calculates by first in the energy detector 301
EDCompare with the predetermined threshold τ in the energy measuring.
Predetermined threshold τ. the false alarm probability P that regulation can be born during with system design
F' and test statistics T
EDDistribution relevant.Can set the decision-making value τ in the energy measuring in the following manner.
At H
0Situation under, T
EDFollow the χ that the degree of freedom is 2MN
2Distribute.So H
0Under T
EDCumulative density function (CDF) do
Wherein Γ () representes incomplete gamma function, and Γ () representes gamma function.Can be according to the false alarm probability P in the computes energy measuring
F'
Therefore, for given P
F', the decision-making value τ that can obtain in the energy measuring does
Wherein,
is the inverse function of
.
In step S303, confirm T if first compares judgment device 3013
EDGreater than τ, then fall into H
1In, can judge existence from the signal busy channel that communication equipment sent that uses other communication standard, so in step S311, first compares judgment device 3013 notices needs the equipment of transport payload data to avoid transmitting.
In step S303, confirm T if first compares judgment device 3013
EDBe not more than τ, then fall into H
0In, can judge the signal busy channel that communication equipment sent that does not exist from using other communication standard.Further, in step S305, first compares judgment device 3013 sends enable signals to total blindness's detector 203, makes 203 work of total blindness's detector.
In the present invention; Utilize arithmetic average to geometric average detector (AGD) (referring to Y.Zeng and L.C.Liang " Eigenvalue-based spectrum sensing algorithm forcognitive radio " in IEEE Transactions on Communications; Vol.57; Jun.2009 pp.1784-1793) realizes that the total blindness who is positioned at place, the second level detects.
Be positioned at partial total blindness's detector AGD 203 and strictly derive test statistics T in accordance with generalized likelihood-ratio test (GLRT) example
AGD, and do not need R
xAnd σ
2Any prior information (referring to R.Zhang; T.J.Lim; Y.C.Liang, and Y.Zeng " Multi-antennabased spectrum sensing for cognitive radios:a GLRT approach " in IEEETransactions on Communications, vol.58; Jan.2010, pp.84-88).AGD detects the inherent correlation (or rather, being the feature space of the sampling covariance matrix of the data sampling that received) of the data sampling that is received, thereby has robustness for the noise uncertainty.
As shown in Figure 3, in step S307, second calculation element 2031 that is arranged in partial total blindness's detector AGD 203 is to received signal y, and the formula that following the GLRT example derives calculates corresponding total blindness's detection statistic T
AGDIn the OFDM60GHz system as applying examples, this reception signal y should be vector, and the hypothesis of the energy measuring of carrying out in the first order is similar, supposes in N the independent observation piece of observed time period, to observe y
n, n=0 wherein ..., N-1, each y
nBe the vector of M * 1, they are separate on statistics.Use y
n=[y
n(0) ..., y
n(M-1)]
TRepresent y
nIn M measured value, and have
H
0：y
n＝w
n，n＝0，...，N-1
H
1：y
n＝x
n+w
n，n＝0，...，N-1
Particularly, in step S307, second calculation element 2031 among total blindness's detector AGD 203 calculates test statistics T according to the following formula of following the GLRT derivation
AGD
Wherein K is a multiplication factor, can be used for being modified in H
0Hypothesis under total blindness's test statistics T
AGDDistribution; λ
m={ λ
n..., λ
M-1Be descending, to y
nThe sampling covariance matrix
Carry out M the characteristic value that characteristic value decomposition obtains;
With
It is respectively eigenvalue
mArithmetic average (AM) and geometric average (GM).
Next at step S309, compare judgment device 3033 with the test statistics T that calculates by second among total blindness's detector AGD 303
AGDCompare with the predetermined threshold η in total blindness's detection.
Predetermined threshold η is also. the false alarm probability P that regulation can be born during with system design
F" with test statistics T
AGDDistribution relevant.Can set the decision-making value η in total blindness's detection in the following manner.
As previously mentioned, multiplication factor K can be used for being modified in H
0Hypothesis under test statistics T
AGDDistribution.Here, can be provided with
So that T
AGDFollow the degree of freedom progressively and be (M
2-1) χ
2Distribute (referring to W.S.Liggett; " Passive sonar:fitting models to multiple time series " in Processing of the NATO ASI onSignal Processing; J.W.R Griffiths and P.L.Stocklin; Eds.Academic Press:New York, 1973, pp.327-345).Can obtain thus, at H
0Under T
AGDCDF can be expressed as
Wherein Γ () representes incomplete gamma function, and Γ () representes gamma function.Can be according to the false alarm probability P in the computes energy measuring
F"
Therefore, for given P
F", the decision-making value η that can obtain in total blindness's detection does
Wherein,
is the inverse function of
.
In step S309, confirm T if second compares judgment device 3033
EDGreater than η, then fall into H
1In, can judge existence from the signal busy channel that communication equipment sent that uses other communication standard, so in step S313, second compares judgment device 3033 notices needs the equipment of transport payload data to avoid transmitting.
In step S309, confirm T if second compares judgment device 3033
EDBe not more than η, then fall into H
0In, can judge the signal busy channel that communication equipment sent that does not exist from using other communication standard, so in step S311, second compares judgment device 3033 notices needs the equipment of transport payload data to transmit.
Therefore,, declared that by error channel is unoccupied, be positioned at the judgement that partial total blindness's detector 203 can be revised this mistake so if be in the energy detector 201 of the first order according to two-stage coexistence detection scheme of the present invention.Compare with the scheme that direct employing total blindness detector 203 coexists detection; Two-stage coexistence detection scheme according to the present invention has reduced computation complexity; Because only under the unappropriated situation of the energy detector that is positioned at the first order 201 reporting channel, just need call total blindness's detector 203.
Only being described for the application in multicarrier (OFDM) the 60GHz system although it will be understood by those skilled in the art that exemplary embodiment of the present invention, also is being similar to the application in single carrier (SC) the 60GHz system.
In addition, although exemplary embodiment of the present invention only described to the energy detector through being in the first order be in partial total blindness's detector and realize that coexistence detects, scope of the present invention is not limited to this.It will be understood by those skilled in the art that under the situation of not considering computation complexity, total blindness's detector that also can be through being in the first order be in partial energy detector and realize that coexistence detects.In this alternate embodiment,, needing then to avoid the equipment of transport payload data to transmit if use total blindness's detector to detect existence from the signal busy channel that communication equipment sent that uses other communication standard at first order place; Otherwise, call and be positioned at partial energy detector.At place, the second level,, need then to allow the equipment of transport payload data to transmit if detect channel occupancy for empty; Otherwise, avoid the transport payload data.
Those skilled in the art should be easy to recognize, can realize the different step of said method through programmed computer.At this; Some execution modes comprise equally machine readable or computer-readable program storage device (as; Digital data storage medium) and the coding machine can carry out or the executable program command of computer, wherein, some or Overall Steps of said method carried out in this instruction.For example, program storage device can be digital storage, magnetic storage medium (like Disk and tape), hardware or the readable digital data storage medium of light.Execution mode comprises the programmed computer of the said step of carrying out said method equally.
Description and accompanying drawing only illustrate principle of the present invention.Therefore should be appreciated that those skilled in the art can advise various structure,, embodied principle of the present invention and be included within its spirit and the scope though these various structure are not clearly described herein or illustrated.In addition, all examples of here mentioning mainly only are used for the design of teaching purpose with help reader understanding's principle of the present invention and promotion this area that the inventor was contributed clearly, and should be interpreted as the restriction that is not these specific examples of mentioning and condition.In addition, all statement and specific examples thereof of mentioning principle of the present invention, aspect and execution mode comprise its equivalent interior here.
Claims (10)
1. method that the communication system that takies same channel transmission data is coexisted and detects comprises:
Calculate first detection statistic according to receiving signal;
Be not more than under the situation of first predetermined threshold in said first detection statistic, trigger the calculating of second detection statistic;
Be not more than under the situation of second predetermined threshold in said second detection statistic, confirm that channel is unoccupied, notice allows the transmission of payload data,
Wherein, one of said first detection statistic and said second detection statistic are that energy and noise variance according to said reception signal calculates; And in said first detection statistic and said second detection statistic another is to obtain according to a plurality of eigenvalue calculation to said reception signals sampling covariance matrix.
2. method according to claim 1; Also comprise: under the situation of said first detection statistic greater than said first predetermined threshold, perhaps under the situation of said second detection statistic greater than said second predetermined threshold; Confirm that channel is occupied, send the notice of the transmission of avoiding payload data.
3. method according to claim 1, wherein said first predetermined threshold is set based on the distribution of known false alarm probability and said first detection statistic: and said second predetermined threshold is set based on the distribution of known false alarm probability and said second detection statistic.
4. method according to claim 1, the arithmetic average of another in wherein said first detection statistic and said second detection statistic and said a plurality of characteristic values is logarithmic relationship with the ratio of geometric average.
5. method according to claim 1, wherein first detection statistic and the distribution of second detection statistic meet the χ of the different degrees of freedom
2Distribute.
6. equipment that the communication system that takies same channel transmission data is coexisted and detects comprises:
First detector comprises:
First calculation element is used for calculating first detection statistic according to receiving signal; And
First compares judgment device, is used for being not more than under the situation of said first predetermined threshold in said first detection statistic, triggers the calculating of second detection statistic;
Second detector comprises:
Second calculation element is used for calculating second detection statistic according to receiving signal; And
Second compares judgment device, is used for being not more than under the situation of second predetermined threshold in said second detection statistic, confirms that channel is unoccupied, and notice allows the transmission of payload data,
Wherein, one of said first detection statistic and said second detection statistic are that energy and noise variance according to said reception signal calculates; And in said first detection statistic and said second detection statistic another is to obtain according to a plurality of eigenvalue calculation to said reception signals sampling covariance matrix.
7. equipment according to claim 6; Wherein, Said first relatively judgment device under the definite situation of said first detection statistic greater than said first predetermined threshold, or the said second comparison judgment device under the situation of said second detection statistic greater than said second predetermined threshold; Confirm that channel is occupied, send the notice of avoiding the payload data transmission.
8. equipment according to claim 6, wherein said first predetermined threshold is set based on the distribution of known false alarm probability and said first detection statistic: and said second predetermined threshold is set based on the distribution of known false alarm probability and said second detection statistic.
9. equipment according to claim 6, the arithmetic average of another in wherein said first detection statistic and said second detection statistic and said a plurality of characteristic values is logarithmic relationship with the ratio of geometric average.
10. equipment according to claim 6, wherein first detection statistic and the distribution of second detection statistic meet the χ of the different degrees of freedom
2Distribute.
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| CN201010292833.1A CN102413088B (en) | 2010-09-20 | 2010-09-20 | For the method and apparatus detected that coexists |
| JP2011138481A JP5213997B2 (en) | 2010-09-20 | 2011-06-22 | Method and apparatus for coexistence detection |
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| CN102413088B CN102413088B (en) | 2015-07-29 |
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| CN105427180A (en) * | 2014-09-17 | 2016-03-23 | 株式会社东芝 | Quality controlling device and control method thereof |
| CN114631393A (en) * | 2019-11-07 | 2022-06-14 | 三菱电机株式会社 | Hybrid carrier sense multiple access with collision avoidance system for better coexistence of IEEE802.15.4 with IEEE802.11 |
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| JP5967454B2 (en) * | 2012-08-09 | 2016-08-10 | パナソニックＩｐマネジメント株式会社 | Wireless communication system |
| KR101494966B1 (en) * | 2013-07-15 | 2015-02-25 | 한국과학기술원 | Method and apparatus for wideband spectrum sensing in cognitive radio |
| CN104618908B (en) * | 2014-12-31 | 2017-11-10 | 重庆邮电大学 | The method and apparatus that distributed cognition wireless network is attacked anti-distort perception data |
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| US20060227005A1 (en) * | 2005-04-08 | 2006-10-12 | Baker Hughes Incorporated | System and methods of communicating over noisy communication channels |
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| JP4531581B2 (en) * | 2005-02-09 | 2010-08-25 | 株式会社エヌ・ティ・ティ・ドコモ | Control device in wireless communication transmitting / receiving device and wireless communication transmitting / receiving method |
| US8964692B2 (en) * | 2008-11-10 | 2015-02-24 | Qualcomm Incorporated | Spectrum sensing of bluetooth using a sequence of energy detection measurements |
| JP5337111B2 (en) * | 2010-01-07 | 2013-11-06 | 株式会社エヌ・ティ・ティ・ドコモ | Signal detection apparatus and signal detection method used in a radio station of a radio communication system |
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| US20060227005A1 (en) * | 2005-04-08 | 2006-10-12 | Baker Hughes Incorporated | System and methods of communicating over noisy communication channels |
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| RUI ZHANG等: "Multi-Antenna Based Spectrum Sensing for Cognitive Radios: A GLRT Approach", 《EEE TRANSACTIONS ON COMMUNICATIONS》 * |
| SIAVASH FAZELI-DEHKORDY等: "WO-STAGE SPECTRUM DETECTION IN COGNITIVE RADIO NETWORKS", 《IEEE ICASSP》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105427180A (en) * | 2014-09-17 | 2016-03-23 | 株式会社东芝 | Quality controlling device and control method thereof |
| CN105427180B (en) * | 2014-09-17 | 2020-05-19 | 株式会社东芝 | Quality control apparatus and control method thereof |
| CN114631393A (en) * | 2019-11-07 | 2022-06-14 | 三菱电机株式会社 | Hybrid carrier sense multiple access with collision avoidance system for better coexistence of IEEE802.15.4 with IEEE802.11 |
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| Publication number | Publication date |
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| CN102413088B (en) | 2015-07-29 |
| JP5213997B2 (en) | 2013-06-19 |
| JP2012065307A (en) | 2012-03-29 |
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