CN102546060B - Cognitive radio cooperative spectrum perception experiment platform and cooperative perception method - Google Patents
Cognitive radio cooperative spectrum perception experiment platform and cooperative perception method Download PDFInfo
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Abstract
The invention discloses a cognitive radio cooperative spectrum perception experiment platform which comprises an energy detection node, a matching filter perception node, a central node, a gateway interface and a gateway interface and a spectrum pool. The energy detection node, the matching filter perception node, the central node and a cognitive user form a wireless communication network for information interaction. The invention also discloses a cooperative perception method which is applied to the cognitive radio cooperative spectrum perception experiment platform, and the method comprises the following steps that: the energy detection node and the matching filter perception node respectively carry out spectrum perception and send the judgment information to the spectrum pool; the spectrum pool fuses the data of the judgment information, and a conflict channel set and a candidate channel set are obtained; and the central node distributes channels according to the queue of the candidate channel set and the cognitive user, and the gateway interface informs the cognitive user of the distribution result. According to the invention, the respective advantages of energy detection and matching filter detection are fully utilized, the performance of a cognitive network is improved, and simultaneously, the complicacy of data fusion is reduced.
Description
Technical field
The present invention relates to a kind of cognitive radio frequency spectrum cognition technology, relate in particular to a kind of cognitive wireless radio cooperation frequency spectrum perception experiment porch and cooperative sensing method.
Background technology
Along with the surge of radio communication service and equipment, Radio Spectrum Resource day is becoming tight, and traditional spectrum management mode has been subject to great challenge.Cognitive radio (CR, Cognitive Radio) technology can realize the secondary utilization of idle frequency spectrum, and in order effectively to solve, current wireless network intermediate frequency spectrum resource is nervous has opened up new approach with not high this contradiction of the availability of frequency spectrum.
Cognitive radio is a kind of Novel Communication technology growing up on software radio basis.It is by periphery electromagnetic environment is carried out to frequency spectrum perception, and the current frequency spectrum " cavity " of authorized network, adjusts radio transmission parameter and the access of chance formula ground, has both avoided the interference to the authorized user in this frequency range, has guaranteed again the transmission of cognitive device.Key technology of cognitive radio and realize prerequisite how be fast and accurately exactly frequency spectrum perception.Current frequency spectrum perception strategy mainly contains the methods such as energy measuring, matched filtering method, signal period Characteristics Detection.
In the practical application scene of CR, due between cognitive user (using the user of CR technology) and authorized user without any interactive information (CR the transparency principle), the impact of the unfavorable factor such as the shade of wireless environment, multipath, noise be uncertain in addition, only the single frequency spectrum perception strategy of a voucher cognitive user cannot carry out to faint authorization signal the detection of high reliability and hard real-time conventionally, and hidden terminal problem is problem demanding prompt solution in frequency spectrum perception always.Cooperative spectrum sensing is one of effective solution to the problems described above, it by a common signal channel to multiple CR independently discriminative information merge, improve precision and the real-time of frequency spectrum detection, can effectively solve the hidden terminal problem in frequency spectrum perception.
But existing cooperation frequency spectrum sensing method, is faced with following problem:
(1) each frequency spectrum perception all needs a large amount of cognitive user to participate in.Perception meeting consumes a large amount of energy of cognitive user frequently, thereby has greatly reduced the life-span of cognitive user; Meanwhile, the user of participation frequency spectrum perception also will lose a large amount of transmission times.Do not make full use of like this frequency spectrum " cavity " of authorisation network, therefore restricted the throughput of cognition network.
(2) due to the movement of cognitive user position, the confidence level of each discriminative information all changes, and has caused the difficulty of control centre's data fusion.In actual techniques, conventional several simple, practical data fusion mode can not guarantee the correctness of final sensing results.
In addition,, in 802.22 draft standard, do not provide the concrete methods of realizing of cooperative spectrum sensing yet.At present, based on the research of cooperative spectrum sensing, mostly concentrate on and how to carry out in data interaction and information processing, the method for proposition more complicated all mostly, is difficult to be applied to reality.Go frequency spectrum perception and how avoid cognitive user to interrupt frequently transmission, thereby improve the throughput of cognition network, extend the life-span of cognitive user, reduce the aspect such as complexity of data fusion simultaneously, but seldom relate to.
The problem existing in cooperative spectrum sensing in view of above-mentioned prior art, needs one can avoid cognitive user to interrupt frequently transmission and goes frequency spectrum perception, improves cognition network performance, reduces the cooperative spectrum sensing technology of the complexity of data fusion simultaneously.
Summary of the invention
Because the above-mentioned defect of prior art, technical problem to be solved by this invention is to provide a kind of cognitive wireless radio cooperation frequency spectrum perception experiment porch and cooperative sensing method, by detecting in conjunction with energy measuring, matched filtering, find out accurately and real-time current frequency spectrum " cavity " and offer the cognitive user in this region by gateway interface, and the appearance of authorized user can be detected in time.In addition on this basis, the present invention has designed simple, a practical channel allocation agreement and has reduced as much as possible the decline of cognitive user transmission rate in frequency spectrum handoff procedure.
For achieving the above object, the invention provides a kind of cognitive wireless radio cooperation frequency spectrum perception experiment porch, it is characterized in that, comprise energy measuring node, matched filtering sensing node, Centroid, gateway interface and spectrum pool; Described energy measuring node, described matched filtering sensing node, described Centroid and cognitive user are access in a cordless communication network, and carry out information interaction by described cordless communication network; Described energy measuring node adopts energy measuring to carry out frequency spectrum perception; Described matched filtering sensing node adopts matched filtering detection to carry out frequency spectrum perception; Described Centroid sends control signaling by described cordless communication network; Described gateway interface is regained and is registered and to described cognitive user broadcast channel assigned result for accepting the channel request registration of described cognitive user and channel; Described spectrum pool, for recording the state of channel, receives the discriminative information of described energy measuring node and described matched filtering sensing node, and described discriminative information is carried out to data fusion.
Further, the state of described channel comprises: whether described channel is occupied; Take the user's of described channel classification, described user's classification comprises authorized user and cognitive user; And the moment of the described channel of access of described cognitive user and the moment of exiting described channel.
Further, described Centroid, described gateway interface and described spectrum pool are made up of computer.
Further, described energy measuring node comprises radio-frequency front-end, high-speed AD converter, high-speed parallel converting interface circuit, digital band-pass filter and energy detector.
Further, described matched filtering sensing node comprises radio-frequency front-end, high-speed AD converter, high-speed parallel converting interface circuit, digital band-pass filter and matched filter detector.
Further, described high-speed parallel converting interface circuit is made up of programmable logic array chip, Programmable Logic Device chip or field programmable logic array chip.
Further, described digital band-pass filter and described energy detector are made up of digital signal processing chip.
Further, described digital band-pass filter and described matched filter detector are made up of digital signal processing chip.
Further, the invention provides a kind of cognitive wireless radio cooperation cognitive method, be applied to described cognitive wireless radio cooperation frequency spectrum perception experiment porch, it is characterized in that, is a kind of cycle detection; Comprise the following steps for described cycle detection each time: described Centroid sends cycle detection by described cordless communication network and starts signaling; Described energy measuring node and described matched filtering sensing node carry out respectively frequency spectrum perception; Described energy measuring node and described matched filtering sensing node send to discriminative information respectively described spectrum pool; Described spectrum pool carries out data fusion to described discriminative information, obtains collision channels collection and candidate channel collection, and described collision channels collection is sent to described gateway interface, and described candidate channel collection is sent to described Centroid; Described gateway interface notifies the cognitive user of described collision channels collection to exit described channel; Described Centroid carries out channel allocation according to described candidate channel collection and cognitive user queue, and notifies described cognitive user by the result of described distribution by described gateway interface.
Further, the step that described spectrum pool carries out data fusion is: described spectrum pool adopts exclusive disjunction to carry out data fusion to the discriminative information of the described matched filtering sensing node receiving, if the result after described data fusion is conflict, judge that described channel clashes, described channel is sent into described collision channels collection; Described spectrum pool adopts to the discriminative information of the described Energy-aware node receiving that the minority is subordinate to the majority that mode is carried out data fusion, if the result after described data fusion be the free time, judges that described channel is as the free time, and described channel is sent into described candidate channel collection.
In preferred embodiments of the present invention, cognitive wireless radio cooperation frequency spectrum perception experiment porch of the present invention comprises three energy measuring nodes, two matched filtering sensing nodes, spectrum pool, Centroid and gateway interfaces.Wherein, three energy measuring nodes, two matched filtering sensing nodes, Centroid and two cognitive user are all connected to WI-FI adapter, they form a WLAN (wireless local area network) based on 802.11 by wireless router, for the information interaction between energy measuring node, matched filtering sensing node, Centroid and the cognitive user of platform.Centroid is connected and builds on same computer with spectrum pool, gateway interface, energy measuring node is made up of radio-frequency front-end, high-speed A/D converter, high-speed parallel conversion interface circuit, digital band-pass filter and energy detector, and matched filtering detection node is made up of radio-frequency front-end, high-speed A/D converter, high-speed parallel conversion interface circuit, digital band-pass filter and matched filter detector.Spectrum pool is for recording the information such as priority, channel service marking word of candidate channel collection, collision channels collection, cognitive user queue, cognitive user, and current available channel resources is sent to Centroid and makes resource distribution, the Resource Allocation Formula of storage center node.Centroid sends and accepts signaling to all sensing nodes.Gateway interface is accepted channel request registration and the channel of cognitive user and is regained registration, and to cognitive user broadcast channel assigned result, if the authorized user of certain channel occurs, gateway interface is using the cognitive user of this channel to exit notice, and for they arrange new channel.The cooperative sensing method that is applied to this cognitive wireless radio cooperation frequency spectrum perception experiment porch comprises step: the initialization of system; Centroid sends cycle detection and starts signaling, and broadcasts current channel service marking word U; Energy measuring node and matched filtering detection node are carried out frequency spectrum perception according to detection method separately, and send discriminative information to spectrum pool; Spectrum pool carries out data fusion, obtains collision channels collection and candidate channel collection, and result is sent to respectively to gateway interface and Centroid.
Therefore visible, the present invention is by adopting Energy-aware node and the different sensing node of matched filtering sensing node two classes, take full advantage of energy measuring and matched filtering and detect advantage separately, can effectively overcome the impact of noise uncertainty on perception accuracy in Energy-aware algorithm, the complexity of matched filtering algorithm be can reduce again, thereby accuracy and the sensitivity of algorithm improved.Cognitive user does not need the cycle to go frequency spectrum perception, has reduced power consumption, has extended the useful life of node; Meanwhile, cognitive user has obtained more transmission times, can improve the utilance to frequency spectrum " cavity ".
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the cognitive wireless radio cooperation frequency spectrum perception experiment porch of preferred embodiment of the present invention;
Fig. 2 is the structure chart of the Centroid of the cognitive wireless radio cooperation frequency spectrum perception experiment porch of preferred embodiment of the present invention;
Fig. 3 is the structure chart of the energy measuring node of the cognitive wireless radio cooperation frequency spectrum perception experiment porch of preferred embodiment of the present invention;
Fig. 4 is the structure chart of the matched filtering sensing node of the cognitive wireless radio cooperation frequency spectrum perception experiment porch of preferred embodiment of the present invention.
Embodiment
As shown in Figure 1, the cognitive wireless radio cooperation frequency spectrum perception experiment porch of the present embodiment comprises: energy measuring node 11,12 and 13, matched filtering sensing node 21 and 22, spectrum pool 3, Centroid 5, wireless router 7, gateway interface 6.Wherein, energy measuring node 11, energy measuring node 12, energy measuring node 13, matched filtering sensing node 21, matched filtering sensing node 22, Centroid 5, cognitive user 8 and cognitive user 9 are all connected to WI-FI adapter, they form a WLAN (wireless local area network) based on 802.11 by wireless router 7, this WLAN (wireless local area network) is as the cordless communication network of whole experiment porch, energy measuring node 11 in network, energy measuring node 12, energy measuring node 13, matched filtering sensing node 21, matched filtering sensing node 22, Centroid 5, cognitive user 8 and cognitive user 9 are carried out information interaction by this WLAN (wireless local area network).
Centroid 5 is connected and builds on same computer with spectrum pool 3, gateway interface 6, and as shown in Figure 2, what be connected with them is WI-FI adapter 406.What spectrum pool 3 adopted is acess database software, for recording the information such as priority, channel service marking word of candidate channel collection, collision channels collection, cognitive user queue, cognitive user, and current available channel resources is sent to Centroid 5 and makes resource distribution, the Resource Allocation Formula of storage center node 5.Spectrum pool 3 is write EXE file by VC++6.0 and is carried out the work such as data fusion.Centroid 5 carries out channel allocation, and Centroid 5 sends and accept signaling by WI-FI adapter 406 to all sensing nodes.Channel request registration and channel that gateway interface 6 is accepted cognitive user 8 and 9 by WI-FI adapter 406 are regained registration, and to cognitive user 8 and 9 broadcast channel assigned results, if the authorized user of certain channel occurs, gateway interface 6 is using the cognitive user of this channel to exit notice, and for they arrange new channel.Wherein, channel request registration is for there being the cognitive user reservation channel of communication requirement, and channel is regained registration and regained for the cognitive user request of having communicated by letter the channel oneself using.Receive after the channel request registration of cognitive user when gateway interface 6, just this cognitive user is sent into queue and wait allocated channel; If gateway interface 6 is received the channel of cognitive user and is regained registration, just this cognitive user is deleted from queue.The wait queue of cognitive user request channel is called cognitive user queue.
In the present embodiment, the model of computer is dell E6400, and the model of WI-FI adapter is Xbox 360USB WI-FI adapter, and the model of wireless router 7 is TP-LINK TL-WR84IN.
As shown in Figure 3, energy measuring node 11 is made up of radio-frequency front-end 111, high-speed A/D converter 112, high-speed parallel conversion interface circuit 113, digital band-pass filter 114 and energy detector 110.Wherein, radio-frequency front-end 111, high-speed A/D converter 112 are the software radio peripheral hardware of energy measuring node 11, digital band-pass filter 114 and energy detector 110 are made up of Digital Signal Processing (DSP) chip, and high-speed parallel conversion interface circuit 113 is the connecting circuits between software radio peripheral hardware and dsp chip.High-speed parallel conversion interface circuit 113 can be made up of programmable logic array (PAL) chip, CPLD (CPLD) chip or field programmable gate array (FPGA) chip, and what in the present embodiment, adopt is fpga chip.The centre frequency of radio-frequency front-end 111 can regulate by its tuner.
In 11 work of energy measuring node, radio-frequency front-end 111 amplifies faint radiofrequency signal, and obtain intermediate-freuqncy signal by mixing, intermediate-freuqncy signal is changed into digital signal by high-speed A/D converter 112, by high-speed parallel converting interface circuit 113, the high-speed parallel data after AD conversion are sent into dsp chip, draw the baseband signal of current subchannel by the digital band-pass filter 114 on dsp chip, baseband signal is sent into energy detector 110 and obtain discriminative information.The model of the dsp chip of selecting in the present embodiment is TMS320VC5502, the model of radio-frequency front-end 111 is AD8347, the model of high-speed A/D converter 112 is AD9862, the model of fpga chip is Cyclone EP1C12, and the bandwidth that digital band-pass filter 114 is C language compilation is the Butterworth mode filter that 3MHz, centre frequency are 0Hz.The external WI-FI adapter 411 of energy measuring node 11.The structure of energy measuring node 12,13 is identical with energy measuring node 11 with work.
As shown in Figure 4, matched filtering detection node 21 is made up of radio-frequency front-end 211, high-speed A/D converter 212, high-speed parallel conversion interface circuit 213, digital band-pass filter 214 and matched filter detector 210.Wherein, the software radio peripheral hardware that radio-frequency front-end 211, high-speed A/D converter 212 are matched filtering detection node 21, digital band-pass filter 214 and energy detector 210 are made up of Digital Signal Processing (DSP) chip, and high-speed parallel conversion interface circuit 213 is the connecting circuits between software radio peripheral hardware and dsp chip.High-speed parallel conversion interface circuit 213 can be made up of programmable logic array (PAL) chip, CPLD (CPLD) chip or field programmable gate array (FPGA) chip, and what in the present embodiment, adopt is fpga chip.The centre frequency of radio-frequency front-end 211 can regulate by its tuner.
In 21 work of matched filtering detection node, radio-frequency front-end 211 amplifies faint radiofrequency signal, and obtain intermediate-freuqncy signal by mixing, intermediate-freuqncy signal is changed into digital signal by high-speed A/D converter 212, by high-speed parallel converting interface circuit 213, the high-speed parallel data after AD conversion are sent into dsp chip, draw the baseband signal of current subchannel by the digital band-pass filter 214 on dsp chip, baseband signal is sent into matched filter detector 210 and obtain discriminative information.The model of the dsp chip of selecting in the present embodiment is TMS320VC5502, the model of radio-frequency front-end 211 is AD8347, the model of high-speed A/D converter 212 is AD9862, the model of fpga chip is Cyclone EP1C12, and the bandwidth that digital band-pass filter 214 is C language compilation is the Butterworth type filtering that 3MHz, centre frequency are 0Hz.The external WI-FI adapter 421 of matched filtering detection node 21.The structure of matched filtering detection node 22 is identical with matched filtering detection node 21 with work.
Cooperative sensing method of the present invention, is applied to above-mentioned cooperative spectrum sensing experiment porch, comprises the following steps:
Step 101, the initialization of system.
In the present embodiment, suppose that authorized user has taken one section of frequency spectrum of 2500-2519MHz, this frequency spectrum is divided into 2500-2503MHz, 2504-2507MHz, 2508-2511MHz, 2512-2515MHz, five wide equally spaced authorization channels of 2516-2519MHz altogether.These authorization channels are numbered respectively, become channel 71,72,73,74 and 75.
The exponent number N=256 of fast Fourier transform (FFT) conversion of the energy detector of energy measuring node 11,12 and 13 is set.
Set the energy decision threshold E of energy measuring node 11,12 and 13, guarantee: if authorized user and cognitive user all do not take this channel, all energy measuring nodes data fusion by the minority is subordinate to the majority (MAJOR) mode in a sense cycle T can arrive this channel idle with 95% Probability Detection.
The sense cycle T that sets energy measuring node 11,12 and 13 is 0.5s, and the transmitted power of authorized user and cognitive user is identical, is 50mW.
The IP address of setting wireless router 7 is: 192.168.0.1, the IP address of 8 WI-FI adapters is: 192.168.0.10 to 192.168.0.17.
Step 102, Centroid 5 sends cycle detection and starts signaling, and broadcasts current channel service marking word U.
In the present embodiment, the beginning signaling that Centroid 5 sends is continuous 8 low levels.
Channel service marking word U is the data of a 5bit, and the state of each channel indicates with a bit.If have cognitive user communication on channel m (m ∈ { 71,72,73,74,75}), the state of channel m is denoted as 1 (busy), otherwise is 0 (free time).
Step 103, is receiving that, after channel service marking word U, energy measuring node 11,12,13 and matched filtering detection node 21,22 are carried out frequency spectrum perception according to detection method separately, and send discriminative information to spectrum pool 3.It is specially step 201 and 202:
Step 201, it is idle channel that energy measuring node 11,12,13 detects service marking, its concrete steps are step 301-303:
Step 301, energy measuring node 11,12,13 is made as the carrier frequency of its radio-frequency front-end the centre frequency of current channel, scanning one-period T.
In the present embodiment, it is idle channel that current channel is followed successively by service marking in channel 71,72,73,74 and 75, and the centre frequency of channel 71,72,73,74 and 75 correspondences is respectively 2501.5MHz, 2505.5MHz, 2509.5MHz, 2513.5MHz and 2517.5MHZ.
Step 302, baseband signal is transformed to frequency domain by fast Fourier transform (FFT), by ask spectral density mean square and, draw the average energy in current channel, energy decision threshold E comparison with setting, judges that whether occupied channel is current.
By result and energy decision threshold E comparison after FFT conversion, if less than E, assert on this channel idlely, the state of this channel is set to 0, otherwise assert on this channel busyly, the state of this channel is set to 1.Result is transmitted to spectrum pool 3;
Step 303, is switched to next channel, enters step 301, until that flag bit is idle scan channel is complete.
Step 202, it is busy channel that matched filtering detection node 21,22 detects service marking, it is specially step 311-313:
Step 311, matched filtering detection node 21,22 is made as the centre frequency of its radio-frequency front-end the centre frequency of current channel, scanning one-period T;
It is busy channel that current channel is followed successively by service marking in channel 71,72,73,74 and 75, and the centre frequency of channel 71,72,73,74 and 75 correspondences is respectively 2501.5MHz, 2505.5MHz, 2509.5MHz, 2513.5MHz and 2517.5MHZ.
Step 312, if the discriminative information of the matched filter detector of matched filtering detection node 21,22 for there is authorized user, thinks that this channel clashes.The state of this channel is set to conflict, otherwise is normal.And result is transmitted to spectrum pool 3;
Step 313, is switched to next channel, enters step 311, until that flag bit is busy scan channel is complete.
Step 104, after the discriminative information of spectrum pool 3 received energy detection node 11,12,13 and matched filtering detection node 21,22, starts to carry out data fusion, obtains collision channels collection and candidate channel collection, and result is sent to respectively to gateway interface 6 and Centroid 5.
Wherein, collision channels collection is the channel set for representing that authorized user and cognitive user clash, and candidate channel collection is the channel set for representing that authorized user and cognitive user all do not take.
In the present embodiment, the discriminative information of spectrum pool 3 to energy measuring node 11,12,13, adopts the convergence strategy of the minority is subordinate to the majority (MAJOR) mode, if flag bit is 0 after merging, assert this channel idle, the label of channel is sent to candidate channel and concentrates.The discriminative information of spectrum pool 3 to matched filtering detection node 21,22, adopts the convergence strategy of exclusive disjunction (OR computing), is 1 if merge rear flag bit, assert this channel confliction, the label of channel is sent to collision channels and concentrates.
Gateway interface 6 notifies the cognitive user of collision channels collection to exit this channel, and upgrades the priority state of this cognitive user.Centroid 5 carries out channel allocation according to candidate channel collection and cognitive user queue, and the result of distribution is notified to corresponding cognitive user by gateway interface 6, upgrades channel service marking word U.
In the present embodiment, adopt the principle of " first obtaining first " to carry out channel allocation.In cognitive user queue, only have the user that priority is high just may be assigned to channel, the cognitive user high to priority, carries out channel allocation according to sequencing in cognitive user queue, until channel is all assigned.When cognitive user obtains after channel, priority becomes low, until its notified exiting, its priority becomes again height.In the present embodiment, the priority state of cognitive user indicates with 0 or 1, and wherein 0 sign priority is high.
More than describe preferred embodiment of the present invention in detail.Should be appreciated that those of ordinary skill in the art just can design according to the present invention make many modifications and variations without creative work.Therefore, all those skilled in the art, all should be in by the determined protection range of claims under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (10)
1. a cognitive wireless radio cooperation frequency spectrum perception experiment porch, is characterized in that, comprises energy measuring node, matched filtering sensing node, Centroid, gateway interface and spectrum pool; Described energy measuring node, described matched filtering sensing node, described Centroid and a cordless communication network of cognitive user composition carry out information interaction; Described energy measuring node adopts energy measuring to carry out frequency spectrum perception; Described matched filtering sensing node adopts matched filtering detection to carry out frequency spectrum perception; Described Centroid sends control signaling by described cordless communication network; Described gateway interface is regained and is registered and to described cognitive user broadcast channel assigned result for accepting the channel request registration of described cognitive user and channel; Described spectrum pool, for recording the state of channel, receives the discriminative information of described energy measuring node and described matched filtering sensing node, and described discriminative information is carried out to data fusion; Described Centroid is used for sending cycle detection sign on, and broadcasts current channel service marking word U; According to the described channel service marking word U receiving, it is idle channel that described energy measuring node detects service marking word, and it is busy channel that described matched filtering sensing node detects service marking word; Described spectrum pool is used for obtaining collision channels collection and candidate channel collection according to data fusion result, and result is sent to respectively to described gateway interface and described Centroid; Described gateway interface is also for notifying the cognitive user of collision channels collection to exit described collision channels; Described Centroid carries out channel allocation according to described candidate channel collection and cognitive user queue, and notifies corresponding cognitive user by the result of distribution by described gateway interface, upgrades described channel service marking word U.
2. cognitive wireless radio cooperation frequency spectrum perception experiment porch as claimed in claim 1, the state of wherein said channel comprises: whether described channel is occupied; Take the user's of described channel classification, described user's classification comprises authorized user and cognitive user; And the moment of the described channel of access of described cognitive user and the moment of exiting described channel.
3. cognitive wireless radio cooperation frequency spectrum perception experiment porch as claimed in claim 1, wherein said Centroid, described gateway interface and described spectrum pool build on computers.
4. cognitive wireless radio cooperation frequency spectrum perception experiment porch as claimed in claim 3, wherein said energy measuring node comprises radio-frequency front-end, high-speed AD converter, high-speed parallel converting interface circuit, digital band-pass filter and energy detector.
5. cognitive wireless radio cooperation frequency spectrum perception experiment porch as claimed in claim 3, wherein said matched filtering sensing node comprises radio-frequency front-end, high-speed AD converter, high-speed parallel converting interface circuit, digital band-pass filter and matched filter detector.
6. the cognitive wireless radio cooperation frequency spectrum perception experiment porch as described in claim 4 or 5, wherein said high-speed parallel converting interface circuit is made up of programmable logic array chip, Programmable Logic Device chip or field programmable logic array chip.
7. cognitive wireless radio cooperation frequency spectrum perception experiment porch as claimed in claim 4, wherein said digital band-pass filter and described energy detector are made up of digital signal processing chip.
8. cognitive wireless radio cooperation frequency spectrum perception experiment porch as claimed in claim 5, wherein said digital band-pass filter and described matched filter detector are made up of digital signal processing chip.
9. a cognitive wireless radio cooperation cognitive method, is applied to cognitive wireless radio cooperation frequency spectrum perception experiment porch as claimed in claim 1 or 2, it is characterized in that, described method is a kind of cycle detection; Comprise the following steps for described cycle detection each time: described Centroid sends cycle detection by described cordless communication network and starts signaling; Described energy measuring node and described matched filtering sensing node carry out respectively frequency spectrum perception; Described energy measuring node and described matched filtering sensing node send to discriminative information respectively described spectrum pool; Described spectrum pool carries out data fusion to described discriminative information, obtains collision channels collection and candidate channel collection, and described collision channels collection is sent to described gateway interface, and described candidate channel collection is sent to described Centroid; Described gateway interface notifies the cognitive user of described collision channels collection to exit described channel; Described Centroid carries out channel allocation according to described candidate channel collection and cognitive user queue, and notifies described cognitive user by the result of described distribution by described gateway interface; Described Centroid is broadcasted current channel service marking word U; According to the described channel service marking word U receiving, it is idle channel that described energy measuring node detects service marking word, and it is busy channel that described matched filtering sensing node detects service marking word; Described Centroid upgrades described channel service marking word U.
10. cognitive wireless radio cooperation cognitive method as claimed in claim 9, the step that wherein said spectrum pool carries out data fusion is: described spectrum pool adopts exclusive disjunction to carry out data fusion to the discriminative information of the described matched filtering sensing node receiving, if the result after described data fusion is conflict, judge that described channel clashes, described channel is sent into described collision channels collection; Described spectrum pool adopts to the discriminative information of the described energy measuring node receiving that the minority is subordinate to the majority that mode is carried out data fusion, if the result after described data fusion be the free time, judges that described channel is as the free time, and described channel is sent into described candidate channel collection.
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