CN103227688B - Dynamic grouping cooperation spectrum detection method based on bandwidth limitation - Google Patents
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Abstract
The invention discloses a dynamic grouping cooperation spectrum detection method based on bandwidth limitation, belonging to the technical field of cognitive radio of wireless communication. A cognitive radio system comprises an authorized user, a detection channel, cognitive users, an inter-cognitive user channel, a feedback channel and a base station. The method comprises the following steps: firstly, the cognitive users are dynamically grouped according to the state information of the inter-user channel; two thresholds are set to only allow the cognitive user with high detection credibility to transmit a detection result to a cluster head; the cluster head transmits a fusion judgment result to the base station through a cooperative mode; and finally, the base station makes the final result decision. In the case of limited bandwidth, the method disclosed by the invention can remarkably reduce the information transmission overhead by losing some negligible system detection performance. At a grouping link, dynamic grouping can be realized by comparing the bit error rate of the channel during direct transmission by the cognitive user and during forwarding transmission of the detection result by the cluster head, and the system performance is obviously improved by the dynamic grouping in comparison with the grouping by a fixed user.
Description
Technical field
The present invention relates to a kind of cooperation frequency spectrum detection method of the Dynamic Packet based on Bandwidth-Constrained, belong to radio communication cognitive radio technology field.
Background technology
Along with the progress of science and technology and the fast development of wireless communication technology, radio spectrum resources is more and more nervous.Due to the distribution policy of various countries' fixed frequency spectrum, cause unlicensed spectrum resource fewer and feweri, along with radio communication service fast developments such as WLAN, WPAN, unauthorized frequency range is asymptotic saturated.Meanwhile, correlative study shows, to a large amount of frequency spectrum resource, its utilance is very low, therefore, solves the contradiction between limited available spectrum resources and frequency spectrum resource poor efficiency in the urgent need to a kind of communication technology.Cognitive radio technology arises at the historic moment.The general principle of cognitive radio is exactly on the basis ensureing to authorize the proper communication of frequency range authorized user, makes unauthorized user use idle frequency spectrum dynamically, improves the utilance of frequency spectrum.
Frequency spectrum perception technology is the basic function of cognitive radio system, is also its key technique.By frequency spectrum perception, cognitive radio users can find spectrum interposition, and temporarily uses this idle frequency spectrum, improves the utilization ratio of frequency spectrum; Meanwhile, the frequency spectrum perception technology in cognitive radio also can be used for the detection whether authorized user occurs, just exits this frequency range in the cognitive user of use authority frequency range to allow in time, and line frequency of going forward side by side spectrum switches, and avoids causing interference to the communication of authorized user.Thus frequency spectrum perception technology is the focus and emphasis of cognitive radio technology research, is also requisite link in its practical application.
Frequency spectrum perception technology can be divided into emission source to detect and energy measuring etc., due to the feature such as priori of energy measuring undesired signal, receives and studies widely and pay close attention to.Original research about frequency spectrum detection technology is exactly the local frequency spectrum detection of single user based on energy measuring, but due to the existence of serious multipath fading and shadow effect, the problem that there is concealed terminal is detected in single user this locality, causes detection perform greatly to reduce.Therefore, researcher, in order to solve hidden terminal problem, proposes cooperation frequency spectrum detection method.For traditional cooperation frequency spectrum detects, what each cognitive user was independent carries out local frequency spectrum detection, then testing result is transferred to fusion center by feedback channel and carries out conclusive judgement.Cooperation frequency spectrum detects and to some extent solves hidden terminal problem, improves the performance of system, but when feedback channel experience deep fade or shadow effect, the performance that cooperation frequency spectrum detects also can decline greatly.In order to address this problem, the cooperation frequency spectrum detection technique based on sub-clustering starts to occur.By suitably dividing into groups to cognitive user, being convenient to manage whole cognitive radio system on the one hand, the feedback channel conditions of cognitive user can be improved on the other hand to a certain extent, improve the detection perform of system.
Existing packet-based cooperation frequency spectrum detection method major part is all the fixed-line subscriber group technology based on user distance, and this type of group technology does not consider the channel status condition between grouping user, and the detection perform of system is difficult to reach optimum.Zhang Wei proposes a kind of cooperation frequency spectrum detection technique based on STBC at paper " Cooperative spectrum sensing with transmit and relay diversity in cognitive radio networks ", there is again researcher to propose Dynamic Packet cooperative spectrum sensing technology based on STBC on this basis thereupon, the program can realize good systems axiol-ogy performance, but the control bandwidth due to system is generally limited, and the overhead of the program is very large, thus limit the application of the program.Dynamic Packet cooperation frequency spectrum detection side rule based on Bandwidth-Constrained proposed by the invention, by losing less even negligible systematic function, reduces system transfers bit number greatly, reduces overhead.
Summary of the invention
For the defect existing for prior art and deficiency, the invention provides a kind of Dynamic Packet cooperation frequency spectrum detection method based on Bandwidth-Constrained, to realize when controlling Bandwidth-Constrained, by under the even insignificant systems axiol-ogy performance of loss part, obtain the decline of system transfers bit number, reduce overhead.
Technical scheme of the present invention is as follows:
A kind of Dynamic Packet cooperation frequency spectrum detection method based on Bandwidth-Constrained, realized by following system, this system comprises authorized user, detects channel, feedback channel and base station between channel, cognitive user, user, all use only need configure single antenna per family and possess the ability obtaining channel information, authorized user transmitter by wireless channel to all cognitive user broadcast singals; First, cognitive user carries out Dynamic Packet according to channel information between user, and the cognitive user that in each grouping, feedback channel conditions is best is set to a bunch head; After cognitive user receives the signal coming from authorized user, according to comparing between the thresholding of the energy value detected and setting, provide detection court verdict, court verdict is sent to bunch head of place group by the cognitive user that testing result enjoys a good reputation by its antenna; Then the testing result of each group bunch head to the group member that feedback is come merges, and fusion results is transferred to base station by feedback channel, and base station is done last testing result and merged, and the concrete steps of this Dynamic Packet detection method are as follows:
A, cognitive radio communication systems prepare to start working;
B, by analyzing the channel condition information situation between the feedback channel conditions of each cognitive user and cognitive user, more direct transmission information, to base station and the size of channel bit error rate being forwarded information to base station by bunch head, is used respectively
p e,d with
p e,f represent the channel bit error rate of direct transmission information and forwarding information process, and carry out Dynamic Packet according to comparative result;
C, each cognitive user carry out local frequency spectrum detection respectively, and namely authorized user does not exist
h 0under condition or authorized user namely exist
h 1energy statistics inspected number under condition under two kinds of assumed conditions, uses
e i,j represent the
iin individual bunch
jthe energy that individual cognitive user accumulates within corresponding detection time;
D, the energy statistics inspected number that will obtain
e i,j with the double threshold of setting
λ l,i with
λ h,i compare, determine whether cognitive user belongs to the cognitive user enjoyed a good reputation, if energy measuring statistic
e i,j be greater than first thresholding
λ h,i or be less than second thresholding
λ l,i , then cognitive user belongs to the detection user enjoyed a good reputation; Otherwise this cognitive user does not belong to the detection user enjoyed a good reputation, wherein
λ l,i represent the
ilow threshold in individual bunch,
λ h,i represent the
ihigh threshold in individual bunch;
If E cognitive user belongs to the detection user enjoyed a good reputation, then this cognitive user will feed back local testing result to a bunch head; If cognitive user does not belong to the detection user enjoyed a good reputation, be then dropped need not for the testing result of this cognitive user;
The testing result of the cognitive user enjoyed a good reputation in F, bunch head fusion group, adopts "or" rule to merge, produces bunch head court verdict;
A bunch head court verdict is transferred to base station by respective feedback channel after completing discriminative information fusion by G, each bunch of head;
H, base station are merged by "or" rule the court verdict of each bunch of head, and the system that produces is to the testing result of authorized user;
I, when information send terminate, then communicate complete, obtain last testing result.
Above-mentioned a kind of Dynamic Packet cooperation frequency spectrum detection method based on Bandwidth-Constrained, carry out Dynamic Packet according to cognitive user feedback channel conditions and the mutual channel condition information of cognitive user in described step B, group technology is specific as follows:
(1) grouping starts;
(2) from ungrouped all cognitive user, the maximum cognitive user of feedback channel signal to noise ratio is chosen as a bunch head;
(3) cognitive user is proceeded as follows:
I. the channel bit error rate of cognitive user directly to base-station transmission information is calculated
, wherein
represent the feedback channel average signal-to-noise ratio of experience Rayleigh fading;
Ii. calculate cognitive user and information is first passed to a bunch head cognitive user, then channel bit error rate when being transmitted to base station by bunch head
p e,f =1-(1-
p e,h ) (1-
p e,m )-
p e,h p e,m , wherein
p e,m represent that cognitive user is to a bunch channel bit error rate for head transmission information,
p e,h represent the channel bit error rate of bunch head to base-station transmission information, under Rayleigh fading condition,
p e,m with
p e,h can by calculating
p e,d method draw;
(4) error rate of the direct transmission information of cognitive user obtained in comparison step (3)
p e,d with a bunch error rate for head forwarding information
p e,f size;
(5) if the error rate of the direct transmission information of cognitive user
p e,d be greater than a bunch error rate for head forwarding information
p e,f , then this cognitive user is divided in the group of bunch head; Otherwise, then this cognitive user is not divided into groups;
(6) the ungrouped cognitive user of the next one is performed from step (2), until in same bunch of head situation, all ungrouped cognitive user all live through a grouping process;
(7) if also have ungrouped cognitive user number to be greater than 1, then get back to step (1) and proceed grouping, cognitive user of not dividing into groups until remaining number is 1, then this last cognitive user is divided into separately one group, and arranges oneself for its bunch of head;
(8) grouping terminates.
Above-mentioned a kind of Dynamic Packet cooperation frequency spectrum detection method based on Bandwidth-Constrained, compares with double threshold according to energy statistics inspected number in described step D, judges whether cognitive user belongs to the detection user enjoyed a good reputation, and determination methods is specific as follows:
(1) false alarm probability of each cognitive user is set
p f ;
(2) according to the relation of false alarm probability and threshold value
, can be obtained
ibunch high threshold
λ h,i , wherein
mrepresent time-bandwidth product, Γ (
m,
λ h,i / 2) represent that two parameters are respectively
mwith
λ h,i the incomplete gamma functions of/2, Γ (
m) represent that parameter is
mcomplete gamma function;
(3) set authorized user not exist namely
h 0under condition
iin bunch, single cognitive user detects failed probability Δ
0,
i ;
(4) according to detection probability of failure
with two-door limit value
λ l,i with
λ h,i relation can obtain second threshold value
λ l,i , namely
Δ
0,
i =
p{
λ l,i <
e i,j <
λ h,i |
h 0}=
f(
λ h,i )-
f(
λ l,i ); Wherein
λ l,i with
λ h,i represent respectively
ibunch high and low thresholding;
,
be illustrated respectively in high and low thresholding
λ h,i with
λ l,i cumulative distribution function in situation;
p{
λ l,i <
e i,j <
λ h,i |
h 0namely represent do not exist at authorized user
h 0under condition
iin bunch
jthe energy detection value of individual cognitive user is positioned at two thresholdings
λ l,i with
λ h,i between probability;
(5) the energy measuring statistic of comparative cognition user
e i,j with two threshold values
λ l,i with
λ h,i size, if energy measuring statistic
e i,j be greater than first thresholding
λ h,i or be less than second thresholding
λ l,i , then cognitive user belongs to the detection user enjoyed a good reputation; Otherwise this cognitive user does not belong to the detection user enjoyed a good reputation.
The advantage that the present invention is based on the Dynamic Packet cooperation frequency spectrum detection method of Bandwidth-Constrained is as follows:
1, contemplated by the invention the channel conditions condition between user, and do not think that the channel between user is desirable, more meet reality scene, have more practicality.
2, present invention employs Dynamic Packet scheme, improve the feedback channel conditions of cognitive user, improve the detection perform of system to a certain extent.
3, the present invention is by taking double threshold scheme, only allows the cognitive user feedback testing result enjoyed a good reputation, by the negligible systematic function of loss part, significantly reduces the bit number of system transfers, reduce overhead.
Accompanying drawing explanation
Fig. 1 is the system configuration schematic diagram of the Dynamic Packet cooperation frequency spectrum detection method that the present invention is based on Bandwidth-Constrained, wherein: 1, authorized user; 2, channel is detected; 3, cognitive user (... represent cognitive user collection); 4, channel (between cognitive user channel) between user; 5, feedback channel; 6, base station (fusion center).
Fig. 2 is the FB(flow block) of the Dynamic Packet cooperation frequency spectrum detection method that the present invention is based on Bandwidth-Constrained: wherein A-I is its each step.
Fig. 3 is the FB(flow block) of Dynamic Packet method in the Dynamic Packet cooperation frequency spectrum detection method step B that the present invention is based on Bandwidth-Constrained, and wherein (1)-(8) are its each step.
Fig. 4 is the credit worthiness situation judging cognitive user in the Dynamic Packet cooperation frequency spectrum detection method step D that the present invention is based on Bandwidth-Constrained, and wherein (1)-(5) are its each step.
embodiment:
Below in conjunction with drawings and Examples, the present invention will be further described, but be not limited thereto.
Embodiment:
The embodiment of the present invention as shown in Figure 1, a kind of cooperation frequency spectrum detection method of the Dynamic Packet based on Bandwidth-Constrained, realized by following system, this system comprises authorized user 1, detects channel 4, feedback channel 5 and base station 6 between channel 2, cognitive user 3, user, all use only need configure single antenna per family and possess the ability obtaining channel information, authorized user 1 transmitter by wireless channel to all cognitive user 3 broadcast singals; First, cognitive user 3 carries out Dynamic Packet according to channel between user 4 information, and the cognitive user 3 that in each grouping, feedback channel conditions is best is set to a bunch head; After cognitive user 3 receives the signal coming from authorized user 1, according to comparing between the thresholding of the energy value detected and setting, provide detection court verdict, court verdict is sent to bunch head of place group by the cognitive user 3 that testing result enjoys a good reputation by its antenna; Then the testing result of each group bunch head to the group member that feedback is come merges, and fusion results is transferred to base station 6 by feedback channel 5, and base station 6 is done last testing result and merged, and the concrete steps of this Dynamic Packet detection method are as follows:
A, cognitive radio communication systems prepare to start working;
B, by analyzing the channel condition information situation between the feedback channel conditions of each cognitive user and cognitive user, more direct transmission information, to base station and the size of channel bit error rate being forwarded information to base station by bunch head, is used respectively
p e,d with
p e,f represent the channel bit error rate of direct transmission information and forwarding information process, and carry out Dynamic Packet according to comparative result;
C, each cognitive user carry out local frequency spectrum detection respectively, and namely authorized user does not exist
h 0under condition or authorized user namely exist
h 1energy statistics inspected number under condition under two kinds of assumed conditions, uses
e i,j represent the
iin individual bunch
jthe energy that individual cognitive user accumulates within corresponding detection time;
D, the energy statistics inspected number that will obtain
e i,j with the double threshold of setting
λ l,i with
λ h,i compare, determine whether cognitive user belongs to the cognitive user enjoyed a good reputation, if energy measuring statistic
e i,j be greater than first thresholding
λ h,i or be less than second thresholding
λ l,i , then cognitive user belongs to the detection user enjoyed a good reputation; Otherwise this cognitive user does not belong to the detection user enjoyed a good reputation, wherein
λ l,i represent the
ilow threshold in individual bunch,
λ h,i represent the
ihigh threshold in individual bunch;
If E cognitive user belongs to the detection user enjoyed a good reputation, then this cognitive user will feed back local testing result to a bunch head; If cognitive user does not belong to the detection user enjoyed a good reputation, be then dropped need not for the testing result of this cognitive user.
The testing result of the cognitive user enjoyed a good reputation in F, bunch head fusion group, adopts "or" rule to merge, produces bunch head court verdict;
A bunch head court verdict is transferred to base station by respective feedback channel after completing discriminative information fusion by G, each bunch of head;
H, base station are merged by "or" rule the court verdict of each bunch of head, and the system that produces is to the testing result of authorized user.
I, when information send terminate, then communicate complete, obtain last testing result.
Above-mentioned a kind of Dynamic Packet cooperation frequency spectrum detection method based on Bandwidth-Constrained, carry out Dynamic Packet according to cognitive user feedback channel conditions and the mutual channel condition information of cognitive user in described step B, group technology is specific as follows:
(1) grouping starts;
(2) from ungrouped all cognitive user, the maximum cognitive user of feedback channel signal to noise ratio is chosen as a bunch head;
(3) cognitive user is proceeded as follows:
I. the channel bit error rate of cognitive user directly to base-station transmission information is calculated
, wherein
represent the feedback channel average signal-to-noise ratio of experience Rayleigh fading;
Ii. calculate cognitive user and information is first passed to a bunch head cognitive user, then channel bit error rate when being transmitted to base station by bunch head
p e,f =1-(1-
p e,h ) (1-
p e,m )-
p e,h p e,m , wherein
p e,m represent that cognitive user is to a bunch channel bit error rate for head transmission information,
p e,h represent the channel bit error rate of bunch head to base-station transmission information, under Rayleigh fading condition,
p e,m with
p e,h can by calculating
p e,d method draw;
(4) error rate of the direct transmission information of cognitive user obtained in comparison step (3)
p e,d with a bunch error rate for head forwarding information
p e,f size;
(5) if the error rate of the direct transmission information of cognitive user
p e,d be greater than a bunch error rate for head forwarding information
p e,f , then this cognitive user is divided in the group of bunch head; Otherwise, then this cognitive user is not divided into groups;
(6) the ungrouped cognitive user of the next one is performed from step (2), until in same bunch of head situation, all ungrouped cognitive user all live through a grouping process;
(7) if also have ungrouped cognitive user number to be greater than 1, then get back to step (1) and proceed grouping, cognitive user of not dividing into groups until remaining number is 1, then this last cognitive user is divided into separately one group, and arrange its oneself be bunch head;
(8) grouping terminates.
Above-mentioned a kind of Dynamic Packet cooperation frequency spectrum detection method based on Bandwidth-Constrained, compares with double threshold according to energy statistics inspected number in described step D, judges whether cognitive user belongs to the detection user enjoyed a good reputation, and determination methods is specific as follows:
(1) false alarm probability of each cognitive user is set
p f ;
(2) according to the relation of false alarm probability and threshold value
, can be obtained
ibunch high threshold
λ h,i , wherein
mrepresent time-bandwidth product, Γ (
m,
λ h,i / 2) represent that two parameters are respectively
mwith
λ h,i the incomplete gamma functions of/2, Γ (
m) represent that parameter is
mcomplete gamma function;
(3) set authorized user not exist namely
h 0under condition
iin bunch, single cognitive user detects failed probability Δ
0,
i ;
(4) according to detection probability of failure
with two-door limit value
λ l,i with
λ h,i relation can obtain second threshold value
λ l,i , namely
Δ
0,
i =
p{
λ l,i <
e i,j <
λ h,i |
h 0}=
f(
λ h,i )-
f(
λ l,i ), wherein
λ l,i with
λ h,i represent respectively
ibunch high and low thresholding;
,
be illustrated respectively in high and low thresholding
λ h,i with
λ l,i cumulative distribution function in situation;
p{
λ l,i <
e i,j <
λ h,i |
h 0namely represent do not exist at authorized user
h 0under condition
iin bunch
jthe energy detection value of individual cognitive user is positioned at two thresholdings
λ l,i with
λ h,i between probability;
(5) the energy measuring statistic of comparative cognition user
e i,j with two threshold values
λ l,i with
λ h,i size, if energy measuring statistic
e i,j be greater than first thresholding
λ h,i or be less than second thresholding
λ l,i , then cognitive user belongs to the detection user enjoyed a good reputation; Otherwise this cognitive user does not belong to the detection user enjoyed a good reputation.
Claims (3)
1. the Dynamic Packet cooperation frequency spectrum detection method based on Bandwidth-Constrained, realized by following system, this system comprises authorized user, detects channel, feedback channel and base station between channel, cognitive user, user, all use only need configure single antenna per family and possess the ability obtaining channel information, authorized user transmitter by wireless channel to all cognitive user broadcast singals; First, cognitive user carries out Dynamic Packet according to channel information between user, and the cognitive user that in each grouping, feedback channel conditions is best is set to a bunch head; After cognitive user receives the signal coming from authorized user, according to comparing between the thresholding of the energy value detected and setting, provide detection court verdict, court verdict is sent to bunch head of place group by the cognitive user that testing result enjoys a good reputation by its antenna; Then the testing result of each group bunch head to the group member that feedback is come merges, and fusion results is transferred to base station by feedback channel, and base station is done last testing result and merged, and the concrete steps of this Dynamic Packet detection scheme are as follows:
A, cognitive radio communication systems prepare to start working;
B, by analyzing the channel condition information situation between the feedback channel conditions of each cognitive user and cognitive user, more direct transmission information, to base station and the size of channel bit error rate being forwarded information to base station by bunch head, is used respectively
p e,d with
p e,f represent the channel bit error rate of direct transmission information and forwarding information process, and carry out Dynamic Packet according to comparative result;
C, each cognitive user carry out local frequency spectrum detection respectively, and namely authorized user does not exist
h 0under condition or authorized user namely exist
h 1energy statistics inspected number under condition under two kinds of assumed conditions, uses
e i,j represent the
iin individual bunch
jthe energy that individual cognitive user accumulates within corresponding detection time;
D, the energy statistics inspected number that will obtain
e i,j with the double threshold of setting
λ l,i with
λ h,i compare, determine whether cognitive user belongs to the cognitive user enjoyed a good reputation, if energy measuring statistic
e i,j be greater than first thresholding
λ h,i or be less than second thresholding
λ l,i , then cognitive user belongs to the detection user enjoyed a good reputation; Otherwise this cognitive user does not belong to the detection user enjoyed a good reputation, wherein
λ l,i represent the
ilow threshold in individual bunch,
λ h,i represent the
ihigh threshold in individual bunch;
If E cognitive user belongs to the detection user enjoyed a good reputation, then this cognitive user will feed back local testing result to a bunch head; If cognitive user does not belong to the detection user enjoyed a good reputation, be then dropped need not for the testing result of this cognitive user;
The testing result of the cognitive user enjoyed a good reputation in F, bunch head fusion group, adopts "or" rule to merge, produces bunch head court verdict;
A bunch head court verdict is transferred to base station by respective feedback channel after completing discriminative information fusion by G, each bunch of head;
H, base station are merged by "or" rule the court verdict of each bunch of head, and the system that produces is to the testing result of authorized user;
I, when information send terminate, then communicate complete, obtain last testing result.
2. a kind of Dynamic Packet cooperation frequency spectrum detection method based on Bandwidth-Constrained as claimed in claim 1, carry out Dynamic Packet according to cognitive user feedback channel conditions and the mutual channel condition information of cognitive user in described step B, group technology is specific as follows:
(1) grouping starts;
(2) from ungrouped all cognitive user, the maximum cognitive user of feedback channel signal to noise ratio is chosen as a bunch head;
(3) cognitive user is proceeded as follows:
I. the channel bit error rate of cognitive user directly to base-station transmission information is calculated
, wherein
represent the feedback channel average signal-to-noise ratio of experience Rayleigh fading;
Ii. calculate cognitive user and information is first passed to a bunch head cognitive user, then channel bit error rate when being transmitted to base station by bunch head
p e,f =1-(1-
p e,h ) (1-
p e,m )-
p e,h p e,m , wherein
p e,m represent that cognitive user is to a bunch channel bit error rate for head transmission information,
p e,h represent the channel bit error rate of bunch head to base-station transmission information, under Rayleigh fading condition,
p e,m with
p e,h can by calculating
p e,d method draw;
(4) error rate of the direct transmission information of cognitive user obtained in comparison step (3)
p e,d with a bunch error rate for head forwarding information
p e,f size;
(5) if the error rate of the direct transmission information of cognitive user
p e,d be greater than a bunch error rate for head forwarding information
p e,f , then this cognitive user is divided in the group of bunch head; Otherwise, then this cognitive user is not divided into groups;
(6) the ungrouped cognitive user of the next one is performed from step (2), until in same bunch of head situation, all ungrouped cognitive user all live through a grouping process;
(7) if also have ungrouped cognitive user number to be greater than 1, then get back to step (1) and proceed grouping, cognitive user of not dividing into groups until remaining number is 1, then this last cognitive user is divided into separately one group, and arrange its oneself be bunch head;
(8) grouping terminates.
3. a kind of Dynamic Packet cooperation frequency spectrum detection method based on Bandwidth-Constrained as claimed in claim 1, compare with double threshold according to energy statistics inspected number in described step D, judge whether cognitive user belongs to the detection user enjoyed a good reputation, and determination methods is specific as follows:
(1) false alarm probability of each cognitive user is set
p f ;
(2) according to the relation of false alarm probability and threshold value
, can be obtained
ibunch high threshold
λ h,i , wherein
mrepresent time-bandwidth product, Γ (
m,
λ h,i / 2) represent that two parameters are respectively
mwith
λ h,i the incomplete gamma functions of/2, Γ (
m) represent that parameter is
mcomplete gamma function;
(3) set authorized user not exist namely
h 0under condition
iin bunch, single cognitive user detects failed probability Δ
0,
i ;
(4) according to detection probability of failure Δ
0,
i with two-door limit value
λ l,i with
λ h,i relation can obtain second threshold value
λ l,i , namely
Δ
0,
i =
p{
λ l,i <
e i,j <
λ h,i |
h 0}=
f(
λ h,i )-
f(
λ l,i ), wherein
λ l,i with
λ h,i represent respectively
ibunch high and low thresholding;
,
be illustrated respectively in high and low thresholding
λ h,i with
λ l,i cumulative distribution function in situation;
p{
λ l,i <
e i,j <
λ h,i |
h 0namely represent do not exist at authorized user
h 0under condition
iin bunch
jthe energy detection value of individual cognitive user is positioned at two thresholdings
λ l,i with
λ h,i between probability;
(5) the energy measuring statistic of comparative cognition user
e i,j with two threshold values
λ l,i with
λ h,i size, if energy measuring statistic
e i,j be greater than first thresholding
λ h,i or be less than second thresholding
λ l,i , then cognitive user belongs to the detection user enjoyed a good reputation; Otherwise this cognitive user does not belong to the detection user enjoyed a good reputation.
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| CN104702355B (en) * | 2015-02-26 | 2017-04-26 | 西安电子科技大学 | Broadband collaboration spectrum sensing method under large/small-scale fading channels |
| CN104703189B (en) * | 2015-03-16 | 2018-01-09 | 山东大学 | A kind of extensive mimo system cognition home network access method |
| CN107911825B (en) * | 2017-08-16 | 2021-09-28 | 重庆邮电大学 | User selection cooperative spectrum sensing method based on double-threshold energy detection |
| CN109673020A (en) * | 2018-11-15 | 2019-04-23 | 天津大学青岛海洋技术研究院 | A kind of fusion type frequency spectrum detecting method |
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