CN104539382B - Pre-cooperative sensing method in cognitive radio network - Google Patents
Pre-cooperative sensing method in cognitive radio network Download PDFInfo
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Abstract
The invention discloses a pre-cooperative sensing method in a cognitive radio network. According to the method, a user is selected from cooperative sensing users to serve as a key user, and the rest of the cooperative sensing users serve as secondary cooperative users. First, the key user conducts local sensing on a master user, and if the master user exists, the key user broadcasts the existence of the master user and reports the existence of the master user to the secondary cooperative users; if the master user does not exist, the sensing sequence is broadcast, and the secondary cooperative users sequentially conduct local sensing on the master user according to the sensing sequence; if the master user exists, the existence of the master user is reported to the key user, and if the master user does not exist, no reporting is conducted. The key user conducts fusion decision according to the received report on the existence of the master user, once it is decided that the master user exists, the existence of the master user is broadcast to the secondary cooperative users, and only when all the secondary cooperative users have conducted local sensing and still do not decide that the master user exists, can it be decided and reported that the master user does not exist. In the method, local sensing of the key user and cooperative sensing of the secondary cooperative users are combined so as to lower the expenses for cooperative sensing.
Description
Technical field
The invention belongs to cognitive radio networks technical field, more specifically, it is related to a kind of cognitive radio networks
In pre- collaborative sensing method.
Background technology
With the development of wireless communication technology, operational frequency spectrum is fewer and feweri, and common situation is then some frequencies
Spectrum is more crowded, and other frequency spectrums are seriously under-utilized.The appearance of cognitive radio to some extent solves this
Problem.In cognitive radio, in the case of primary user's free time, run the frequency spectrum of secondary user's access permission.Thus may be used
Greatly to improve the availability of frequency spectrum.
In cognitive radio, frequency spectrum perception technology plays an important role.In cognitive wireless, frequency spectrum perception is main
It is divided into two big class：Local spectrum sensing scheme and collaborative sensing scheme.Perceive for local, user each carries out frequency spectrum perception.
And in collaborative sensing, user is first locally perceived, then the result of perception is sent to fusion center (Fusion
Center, FC), fusion center collects local perception data, and by suitable criterion, such as " AND " " OR " etc. regular so as to get
Frequency spectrum perception result more accurate.
In cognitive wireless, each media access control frames is made up of sensitive segment and span line, and assumes it is with TDMA
Mode works.Each sensitive segment is further divided into several sub-slots for locally perceiving and decision-making report.Fig. 1 is tradition cooperation
The sensitive segment schematic diagram of perception.As shown in figure 1, M collaboration user CUiEach locally perceived in the same time, Ran Houyi
Secondary sensing results are reported, the sensing results reporting are merged by fusion center, obtain final sensing results.LS in Fig. 1
Represent local and perceive (Local Sensing), DR represents that (Decision Reporting) is reported in decision-making.
In order to prevent the interference to primary user for the collaboration user, special report between cognitive user and fusion center, is had to believe
Road.Because collaborative spectrum sensing technology has used the technology of space diversity between collaboration user, the result therefore obtaining is than single
The result that one user's perception obtains is more accurate.Compared with the method for local perception, frequency spectrum perception mistake is participated in by collaboration user
The collaborative spectrum sensing technology of journey not only can save the time of perception, but also can improve the precision of frequency spectrum perception.
Decreased the uncertainty of result by multiple cognitive user cooperations come the frequency spectrum perception to carry out, one kind can be reached with this
Preferably detection performance.Existing perception flow process is that local frequency spectrum perception result is sent to data fusion center by cognitive user,
Then the sensing results of each user have been merged in data fusion center, fusion center determines whether account for by fusion results
With the frequency spectrum of primary user, then in the form of broadcasting, notify all of collaboration user.Collaborative spectrum sensing is obtained in that preferably
Frequency spectrum perception performance, but also increase the communication overhead of cognitive wireless simultaneously, with respect to the mode of non-cooperating, collaborative sensing disappears
Consume more energy, because they need for the result of local perception to be sent to fusion center, substantial amounts of collaboration user report
Their local sensing results cause huge expense.
Content of the invention
It is an object of the invention to overcoming the deficiencies in the prior art, provide the pre- cooperation sense in a kind of cognitive radio networks
Perception method, the collaborative sensing of the local perception in conjunction with key user and secondary collaboration user, to reduce the expense of collaborative sensing.
For achieving the above object, the pre- collaborative sensing method in cognitive radio networks of the present invention, walks including following
Suddenly：
S1：Select a user as key user C from all M+1 collaborative sensing users, remaining M user's conduct
Secondary collaboration user CUm, wherein m=1,2 ..., M；
S2：Key user C is locally perceived to primary user first, if perceive primary user existed, key user C is wide
The message broadcasting primary user's presence, to all secondary collaboration users, terminating collaborative sensing, if do not perceive primary user existed, entering
Step S3；
S3：Key user C arranges the perception order of M secondary collaboration user, perception order message is broadcasted, and opens
Beginning timing；
S4：Each secondary collaboration user CUmAfter receiving perception order message, it is obtained from the sequence number in perception order
The span of j, j is j=1, and 2 ..., M wait Tm=(j-1) tsStart local perception, tsRepresent each collaborative sensing user
The local perception required time, if secondary collaboration user CUiPerceive primary user to exist, then report to key user C primary
There is report in family, otherwise do not make any operation；
S5：Key user C receives primary user's presence report that secondary collaboration user reports, and first judges that primary user has report
Signal to noise ratio, if signal to noise ratio be more than default threshold value then it is assumed that primary user exist be reported as effectively reporting, as fusion
The foundation judging, otherwise it is assumed that being invalid report, this report is given up；Key user C according to effective primary user exist report into
Row merges judgement, and its method is：There is report to effective primary user and count in key user, judge that effective primary user has report
Accuse and whether reach Q, Q is default value, if it is judge that primary user exists, otherwise for not existing；If it is determined that primary user
Exist, key user C broadcasts the message of primary user's presence to all secondary collaboration users, terminates collaborative sensing, if wait counting
When reach Tw=Mts+tr, wherein trRepresent primary user's report reporting required time, also do not obtain sentencing of primary user's presence
Determine result, then the key user C broadcast non-existent message of primary user gives all secondary collaboration users.
Pre- collaborative sensing method in cognitive radio networks of the present invention, selects a user to make from collaborative sensing user
For key user, remaining, as secondary collaboration user, is locally perceived to primary user by key user first, if primary user
Exist, key user broadcast primary user has report to secondary collaboration user, otherwise broadcast perception order, and secondary collaboration user is pressed
Perception order is locally perceived to primary user successively, if it is present reporting to key user, does not otherwise report, crucial use
There is report according to the primary user receiving and carry out merging judgement in family, once judging that primary user exists, wide to secondary collaboration user
Broadcast, do not judge that primary user has just judgement primary user and do not exist and extensively after the local perception of all secondary collaboration users finishes yet
Broadcast.
The present invention has following technique effect：
(1) only when key user locally perceives the collaborative sensing just starting secondary collaboration user when primary user does not exist,
Thus reducing overhead；
(2) when collaborative sensing is activated, only report to key user when collaborative sensing user perceives primary user's
As a result, this can also reduce a part of expense.
(3) based on the sensing results of partly secondary collaboration user, key user C can determine that primary user exists, remaining
Secondary collaboration user be no need for being perceived again and reporting, equally can also reduce expense；
(4) present invention can control overall missing inspection by the time of the local perception of adjustment and secondary collaborative sensing number of users
Probability and expense, thus adapt to the needs of different application situation.
Brief description
Fig. 1 is the sensitive segment schematic diagram of traditional collaborative sensing；
Fig. 2 be the pre- collaborative sensing method in cognitive radio networks of the present invention be embodied as flow chart；
Fig. 3 is the sensitive segment schematic diagram of the pre- collaborative sensing of the present invention；
Fig. 4 is the overall false dismissal probability comparison diagram of the present invention and traditional method；
Fig. 5 is the average perceived time comparison diagram under the local detecting period of different proportion of the present invention and traditional method；
Fig. 6 is the average participation collaboration user number pair under the local detecting period of different proportion of the present invention and traditional method
Than figure；
Fig. 7 is the minimum that the present invention receives under the signal to noise ratio of primary user's signal from traditional method in different key users
Average perceived time comparison diagram；
Fig. 8 is that minimum from traditional method under different primary user's signal to noise ratios for the present invention participates in the contrast of collaboration user number
Figure.
Specific embodiment
Below in conjunction with the accompanying drawings the specific embodiment of the present invention is described, so that those skilled in the art is preferably
Understand the present invention.Requiring particular attention is that, in the following description, when known function and design detailed description perhaps
Can desalinate the present invention main contents when, these descriptions will be ignored here.
Embodiment
Fig. 2 be the pre- collaborative sensing method in cognitive radio networks of the present invention be embodied as flow chart.As Fig. 2 institute
Show, the pre- collaborative sensing method in cognitive radio networks of the present invention comprises the following steps：
S201：Determine key user：
Select a user as key user C from all M+1 collaborative sensing users, remaining M user is as secondary
Level collaboration user CUm, wherein m=1,2 ..., M.Select key user to have multiple standards, typically select to receive letter from primary user
Number the strongest user of signal to noise ratio as key user.
S202：Key user is locally perceived：
Key user C is locally perceived to primary user first.
S203：Judging whether key user perceives primary user and exist, if it does not, entering step S204, otherwise entering
Enter step S213.
S204：Broadcast perception order timing：
Key user C arranges the perception order of M-1 secondary collaboration user, and perception order message is broadcasted, and
Start timing from 0.
Perception order refers to the order that secondary collaboration user is locally perceived.In the present invention, the basis of secondary collaboration user
Ground perception is not carried out simultaneously, but what order was carried out.Perception order is to be arranged according to practical situation, can be according to key
User carries out descending from the signal to noise ratio of secondary collaboration user receipt signal, and that is, the big secondary collaboration user of signal to noise ratio is first carried out
Local perception.
S205：Secondary collaboration user is locally perceived in order：
Each secondary collaboration user CUmAfter receiving perception order message, it is obtained from sequence number j in perception order, j
Span be j=1,2 ..., M, wait Tm=(j-1) tsStart local perception, tsRepresent that each collaborative sensing user is local
The perception required time.
S206：Judge whether that perceiving primary user exists, if secondary collaboration user CUiPerceive primary user to exist, enter
Enter step S207, otherwise enter step S208.
S207：Secondary collaboration user reports primary user to there is report to key user C.
S208：Do not report, do not make any operation.
S209：Key user receives to report and carry out to merge and judges：
Primary user's presence that the secondary collaboration user of key user C reception reports is reported and be there is report according to primary user and carries out
Merge and judge.
In the present embodiment, key user C receives primary user and deposits after reporting, first judges that primary user has the noise of report
Ratio, if signal to noise ratio is more than default threshold value then it is assumed that primary user exists and is reported as effectively reporting, judges as fusion
Foundation, otherwise it is assumed that being invalid report, this report is given up.This be also the present embodiment step S204 in by perception order by letter
Make an uproar ratio the reason to arrange, this sortord of sampling can enable quickly to obtain merging knot when primary user exists
Really, thus saving the time, improve perception efficiency.Key user often receives primary user's presence report and carries out Single cell fusion
Judge.
S210：Whether result of determination is that primary user exists, if it is, entering step S213, if it does not, entering step
S211.
It can be seen that, in the present invention, key user assume responsibility for the function of fusion center, therefore when real system is constituted, needs
Configure corresponding hardware and software for key user.Merge the method judging may determine according to actual needs, the present embodiment letter
Singlely carry out merging using counting mode and judge, that is, key user has report to primary user and counts, and judges that primary user deposits
Whether reaching Q, Q is default value, if it is judging that primary user exists, otherwise for not existing.
S211：Judge whether key user timing t reaches Tw=(M-1) ts+tr, wherein trRepresent primary user's report
Report required time, TwIt is that all secondary collaboration users complete locally to perceive and report the required time, if it is, explanation institute
There is user all to have been completed local perception and report, and merge result of determination and do not exist for primary user, hence into step
S212, otherwise return to step S210.
That is, key user C is after sending perception order message, just persistently timing, and determine whether to obtain primary
The result of determination that family exists, exists if merging judgement in timing course and obtaining primary user, that is, enters corresponding flow process.If one
Straight timing is to TwStill the fusion result of determination of primary user's presence can not be obtained, then explanation primary user does not exist.
S212：The key user C broadcast non-existent message of primary user gives all secondary collaboration users, terminates collaborative sensing.
Now key user and collaboration user can be communicated using the corresponding frequency spectrum of this primary user.
S213：Key user C broadcasts the message of primary user's presence to all secondary collaboration users, terminates collaborative sensing and simultaneously releases
Put current frequency spectrum.
According to above step, the present invention uses a kind of side of " key user is first, judges " in perception
Method.Fig. 3 is the sensitive segment schematic diagram of the pre- collaborative sensing of the present invention.In Fig. 3, DF represents Decision fusion (Decision Fusion).
As shown in figure 3, in the present invention, key user C is locally perceived first if it is decided that primary user does not exist, then by other M-1
Individual user is locally perceived in order successively, it is assumed herein that each secondary collaboration user judges that primary user exists.It is each
User can be reported after completing locally to perceive, and when a upper reporting of user, next user starts locally to perceive,
Key user carries out Single cell fusion judgement after reporting receiving the primary user reporting and deposit.It can be seen that, collaborative sensing of the present invention
In time T, by wherein β T be used as local perceive, remaining (1- β) T is as above calling time.I.e. key user and each cooperation sense
Know local detecting period t of users=β T/ (M+1), a primary user report reporting required time tr=(1- β) T, in general
ts＞ tr.
The present invention only just can carry out collaborative sensing in the presence of key user C is not detected by primary user, with respect to biography
The collaborative sensing method of system, the present invention would not have perception and the cooperating process of report, thus substantially reducing the expense of system.Separately
On the one hand, when collaborative sensing is activated, only when collaborative sensing user perceives primary user's ability to key user's reported result,
This can also reduce a part of expense.And key user C can be able to be sentenced based on the sensing results of partly secondary collaboration user
Determine primary user to exist, remaining secondary collaboration user is no need for being perceived and reporting, and equally can also reduce expense.
In order to the technique effect of the present invention is described, first the critical performance parameters of collaborative sensing in the present invention are derived
Explanation.
But the probability of primary user's presence is detected, detection probability refers to lead when false-alarm probability refers to that primary user not actually exists
It is correctly detecting the probability of primary user's presence in the presence of user.This supposes the side using energy measuring for the local perception in deriving
Method, then false-alarm probability P of single collaborative sensing userfWith detection probability PdCan be expressed as：
Wherein, θ=1 expression judges that primary user exists, H0Represent primary user to not actually exist, H1Represent that primary user is actual to deposit
, Γ () represents gamma function, and u is the time domain bandwidth product of energy detector, and λ is energy threshold,σ represents
Interchannel noise, γPRepresent the received signal to noise ratio of primary user's transmission signal.
According to formula (1) and (2), local false-alarm probability and the detection probability of key user C can be derived：
Wherein, uC=β T/ (M+1) Be,It isAnti- letter
Number, BeIt is the bandwidth of energy detector, be local false-alarm probability, now γPRepresent the received signal to noise ratio of primary user's transmission signal,Represent the interchannel noise between key user and primary user.For the ease of deriving it is herein assumed that key user is secondary with each
Channel between level collaboration user and primary user is identical, and that is, interchannel noise is identical, then the reception letter to primary user's transmission signal
Make an uproar more identical than also.
The local false-alarm probability of each secondary collaboration user CU and detection probability are：
Wherein, uCU=β T/ (M+1) Be,γPRepresent primary user
The received signal to noise ratio of transmission signal, σPCURepresent the interchannel noise between secondary collaboration user and primary user.
False dismissal probability can affect the service quality of primary user's data transfer in cognition wireless network.Carrying out overall missing inspection
During the derivation of probability, setting key user C, when carrying out merging judgement, first carries out the judgement of signal to noise ratio, and signal to noise ratio needs to meet：
Wherein, γCURepresent the signal to noise ratio reporting signal, BrRepresent the bandwidth of reporting channel, hCUCRepresent from secondary cooperation
User is to the channel fading coefficient of key user CU.
The probability that so secondary collaboration user meets signal to noise ratio requirement is：
Wherein,
In H0In the case of, according to the local sensing results of secondary collaboration user CU, key user C judges what primary user existed
Probability is：
Therefore, overall false alarm probability is：
Wherein, ΩvIt is v-th nonvoid subset of secondary collaboration user set omega, be ΩvSupplementary set.
For the sake of simplicity, false alarm probability function is defined as：
Overall false alarm probability is set as α0, so local false alarm probability is represented by：
α=f-1(α0) (12)
Wherein f-1It is the inverse function of f.
Similar, in case, according to the local sensing results of secondary collaboration user CU, key user C judges primary
Family exist probability be：
Finally, the overall detection probability of the present invention can be expressed as：
According to (14) formula, can be easy to draw overall false dismissal probability：
Can be seen that at that time from formula (14),I.e. when the local detection probability of key user C is high,
The present invention seldom adopts collaborative sensing.Therefore, compared with always on the perception of traditional scheme, the present invention can significantly drop
Low perception expense.Additionally, with growth, local detecting period by increase decision-making report time will reduce it means that
Needing trades off between local perception and decision-making report performance considers.
Additionally, detecting period also can affect the handling capacity bottom transmission of secondary collaboration user, that is, detecting period is longer, handles up
Amount bottom transmission is more, and expense is bigger, and detecting period is shorter, and expense is less.Can be distributed by the optimization time in the present invention,
Littleization false dismissal probability and average time.Similarly, rational time distribution also can make the quantity of collaboration user minimize.
Average time needed for frequency spectrum perception is designated as AVT, average collaboration user number scale is AVM.Obviously, tradition in Fig. 1
AVT and AVM of collaborative sensing method is T and M, this is because traditional collaborative sensing method will terminate it in local perception stage
Final judgement just can be given afterwards.
If representing the time making conclusive judgement in the presence of perceiving primary user.If as shown in figure 3, conclusive judgement exists
Time instant τ0Make, that is, key user C detects primary user by local perception and exists, then can be expressed as：
tSens=τ0(16)
If key user C is based on secondary collaboration user CUmCooperation help under in tmMoment makes conclusive judgement, then may be used
To be expressed as.
tSens=τm(17)
According to total probability formula, the AVT of the present invention can be expressed as：
It can be seen that, there are two kinds of situations in the present invention, the first：As M=1, tSens=τm(m=0,1) probability that event occurs is：
Pr{tSens=τ0}=Pd,C(20)
Pr{tSens=τ1}=1-Pd,C(21)
Another kind of situation：Work as M>When 1, tSens=τmThe probability that (m=0,1 ..., M) event occurs is:
In the hope of AVT can be：
Wherein,
b3=T (1-Pd).
Particularly, as M=1,
Similar, the AVM of the present invention is：
It is discussed above, when total detection probability is close to 1, AVT is infinitely close to τ0, as key user C
Detection probability close to 1 when, AVM will be infinitely close to 0.Therefore can be concluded that, if the local inspection of key user
Survey probability high, can reliably enough detect the presence of primary user, then easily draw AVT<T, AVM<M, such present invention can compare
Traditional collaborative sensing method realizes lower detection overhead.
To assess the technical performance of the present invention followed by numerical simulation.In this emulation it is assumed that
Overall false alarm probability is α0=10-3.The persistent period of each perception stage is set to T=20 millisecond.Energy detector
Bandwidth Be=105Hz.The bandwidth B of reporting channelr=104Hz.Each secondary collaboration user reports signal to noise ratio γ of signalCU=
0dB.
Fig. 4 is the overall false dismissal probability comparison diagram of the present invention and traditional method.As shown in figure 4, traditional collaborative sensing side
Total false dismissal probability of method is a definite value, and the overall false dismissal probability of the present invention is with the change of secondary collaboration user quantity M and parameter beta
Change and change, generally speaking much lower than traditional method.In the less region of β value, secondary collaboration user quantity drastically influence
Overall false dismissal probability, the increase with secondary collaboration user quantity it might even be possible to optimizing overall false dismissal probability is 0, but it be with
Increasing expense is cost.When secondary collaboration user quantity is fixing, can by improving β value, that is, increase local perception when
Between, to reduce overall false dismissal probability.When secondary collaboration user quantity M or parameter beta increase to a certain extent, overall false dismissal probability
Will be maintained at a maintenance level.Therefore in actual applications, suitable secondary collaboration user can be set according to actual needs
Quantity M or parameter beta.
Fig. 5 is the average perceived time comparison diagram under the local detecting period of different proportion of the present invention and traditional method.
Fig. 6 is the average participation collaboration user number comparison diagram under the local detecting period of different proportion of the present invention and traditional method.Fig. 5
With in Fig. 6, the present invention pre- collaborative sensing method is referred to PCS.As shown in Figure 5 and Figure 6, it is average for traditional collaborative sensing method
Detecting period is peaceful to be both participated in collaboration user number and keeps constant, and the average perceived time AVT of the present invention is peaceful both participates in cooperation
Number of users AVM reduces with the increase (i.e. local detecting period increase) of parameter beta.Simultaneously it can also be seen that AVT and AVM with
Signal to noise ratio γ that key user receives primary user's signalPVariation tendency, that is, AVT and AVM will be with γPIncrease and reduce,
This is because increasing γPThe reliability of local perception can be improved, also imply that key user C and secondary collaboration user CU tool simultaneously
There is faster power of test.
Fig. 7 is the minimum that the present invention receives under the signal to noise ratio of primary user's signal from traditional method in different key users
Average perceived time comparison diagram.Fig. 8 is that minimum from traditional method under different primary user's signal to noise ratios for the present invention participates in association
Make number of users comparison diagram.Similarly, in Fig. 7 and Fig. 8, the present invention pre- collaborative sensing method is referred to PCS.As shown in Figure 7 and Figure 8,
In the case that primary user's signal to noise ratio is very low, AVT and AVM is all without reduction, this is because the detection probability of local perception is very low.
With the improvement of primary user's signal to noise ratio, AVT and AVM can decrease, and this is that the local detection probability perceiving improves.Simultaneously
It can also be seen that detection probability P with key user Cd,CRaising, AVT and AVM also can reduce further.
The conclusion of above simulating, verifying is consistent with the conclusion of deriving analysis before, and the pre- collaborative sensing side of the present invention is all described
The expense of method has obvious reduction than traditional collaborative sensing method, and also can be by parameter setting come to collaborative sensing
Energy (false dismissal probability) and expense are controlled.
Although being described, in order to the art based on specific embodiment illustrative to the present invention above
Technical staff understands the present invention, it should be apparent that the invention is not restricted to the scope of specific embodiment, general to the art
For logical technical staff, as long as various change is in the spirit and scope of the present invention of appended claim restriction and determination,
These changes are it will be apparent that all utilize the innovation and creation of present inventive concept all in the row of protection.
Claims (3)
1. a kind of pre- collaborative sensing method in cognitive radio networks is it is characterised in that comprise the following steps：
S1：Select a user as key user C from all M+1 collaborative sensing users, remaining M user is as secondary
Collaboration user CUm, wherein m=1,2 ..., M；
S2：Key user C is locally perceived to primary user first, if perceive primary user existed, key user C broadcast master
The message that user exists gives all secondary collaboration users, terminates collaborative sensing, if do not perceive primary user existed, enters step
S3；
S3：Key user C arranges the perception order of M secondary collaboration user, and perception order message is broadcasted, and starts to count
When；
S4：Each secondary collaboration user CUmAfter receiving perception order message, it is obtained from sequence number j in perception order, etc.
Treat Tm=(j-1) tsStart local perception, tsRepresent that each collaborative sensing user is local and perceive the required time, if secondary association
Make user CUiPerceive primary user to exist, then report primary user to there is report to key user C, otherwise do not make any operation；
S5：Key user C receives primary user's presence report that secondary collaboration user reports, and first judges that primary user has the letter of report
Make an uproar and compare, if signal to noise ratio is more than default threshold value then it is assumed that primary user's presence is reported as effectively reporting, judge as merging
Foundation, otherwise it is assumed that being invalid report, this report is given up；There is report according to effective primary user and melted in key user C
Close and judge, its method is：There is report to effective primary user and count in key user, judge that effective primary user has report and is
The no Q that reaches is individual, and Q is default value, if it is judges that primary user exists, otherwise for not existing；If it is determined that primary user exists,
Key user C broadcasts the message of primary user's presence to all secondary collaboration users, terminates collaborative sensing, if waiting timing to reach
Tw=Mts+tr, wherein trRepresent primary user's report reporting required time, also do not obtain the judgement knot of primary user's presence
Really, then the key user C broadcast non-existent message of primary user gives all secondary collaboration users.
2. pre- collaborative sensing method according to claim 1 it is characterised in that the key user in described step S1 be from
The signal to noise ratio of primary user's receipt signal user the strongest.
3. pre- collaborative sensing method according to claim 1 is it is characterised in that secondary collaboration user in described step S3
Perception order obtain according to carrying out descending from the signal to noise ratio of primary user's receipt signal.
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