CN103138846A - Resource utilization device and method of cognitive radio and cognitive radio system - Google Patents
Resource utilization device and method of cognitive radio and cognitive radio system Download PDFInfo
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Abstract
The invention provides a resource utilization device and method of cognitive radio and a cognitive radio system. The resource utilization device comprises a detection value receiver, an evaluation value calculator and a resource allocator, wherein the detection value receiver is used for receiving signal strength detection values transmitted by a plurality cognitive user devices; the evaluation value calculator respectively calculates the signal strength evaluation values of a plurality of sub-bands of the broadband signals according to the signal strength detection values transmitted by the plurality of cognitive user devices; and the resource allocator is used for performing resource allocation on the broadband spectrum according to the signal strength evaluation values of the plurality of sub-bands. By means of the resource utilization device and method and the cognitive radio system, allocation of spectrum resources on the basis of synergy broadband spectrum sensing can be performed, interference on authorized user equipment is reduced furthest, and influence on spectrum detection caused by frequency selective channel fading is overcome.
Description
Technical field
The present invention relates to communication system, relate in particular to a kind of utilization of resources device, method and system for cognitive radio of cognitive radio.
Background technology
Along with the arrival of information age, wireless device is widely used, and wireless frequency spectrum has become the indispensable precious resources of modern society.The distribution utilization of radio spectrum resources is normally by radio law department regulation.The principle of distributing based on static fixed frequency range is generally adopted in countries in the world at present, has caused thus the utilization of frequency spectrum resource to be usually less than 30%.The fixed allocation strategy of visible spectrum can not effectively utilize frequency spectrum resource.
The boundary that communicates by letter in recent years generally recognizes, it is a main cause that causes present frequency spectrum resource increasingly to lack that fixed frequency band distributes.In November, 2002, FCC has issued a report that is intended to effectively manage U.S.'s frequency spectrum resource.Report explicitly points out: " at many frequency bands, the access of frequency spectrum be one than the rare more importantly problem of frequency spectrum itself, frequency spectrum rare to a great extent due to regulation limitations the potential user on these frequency spectrums obtain access ".Actual conditions are also so, and the statistics of suburb in the frequency spectrum occupancy of interior all kinds of regions shown: some frequency bands are unappropriated in most times, and some frequency bands are that part-time is occupied, and the other frequency band is taken by intensive.
The inhomogeneous directs communication industry of utilizing of this frequency spectrum goes to consider " frequency spectrum cavity-pocket " this brand-new concept.Frequency spectrum cavity-pocket refers to distribute to authorized user, a but sub-frequency bands that does not take a certain specific time and spatial authority user, this sub-band can be used by other users (perception user), if in a single day authorized user need to take this frequency band, the perception user needs to discharge immediately.The dynamic access of frequency spectrum resource makes the service efficiency of frequency spectrum be significantly improved.
The cognitive radio power technology is a intelligent wireless communication system that is based upon on Software Radio platform, the excitation that it can the perception external environment condition, use the method that accumulates while understanding external environment condition to be learnt and provided according to external environment condition, operational factor is revised (as through-put power, carrier frequency, modulation system etc.) accordingly, thereby reach the self adaptation adjustment of internal state.
From definition, two principal characters that cognitive radio should possess are perceptions and reconfigure ability.Perception can carry out alternately cognitive radio and surrounding environment by structure, and then determines the radio spectrum resources that suitable messaging parameter conforms; The ability of reconfiguring can not change any hardware components and adjust the emission parameters such as through-put power, carrier frequency, modulation system.The perception of cognitive radio requires Wireless Telecom Equipment to have discovery " frequency spectrum cavity-pocket " and can rationally utilize the ability of " frequency spectrum cavity-pocket " found.Then perception user search frequency spectrum initiatively utilizes these frequency spectrum cavity-pockets effectively to communicate by letter to seek operable frequency spectrum cavity-pocket, carries out dynamically in real time parameter and control in communication process, to avoid the issuable interference of main users.Top priority based on this characteristics cognitive radio is carried out frequency spectrum detection exactly, searches the frequency spectrum cavity-pocket that can be used for carrying out the business transmission.
According to Nyquist (Nyquist) sampling theory, the input in broadband can cause the A/D sampler to have high sampling rate, requirement to the digital signal processor processing speed also can significantly improve, thus cause hardware complexity and equipment cost increase.In existing frequency spectrum resource allocation strategy, the broader frequency spectrum of low service efficiency always is divided into many subbands, if there is frequency spectrum cavity-pocket, frequency spectrum cavity-pocket always occurs with the arrowband form, does not have the appearance in needle-like cavity.Same occupied frequency spectrum is also to occur with the arrowband form, can not exist some wireless systems only to use discontinuous discrete frequency to carry out transfer of data.Generally, the broader frequency spectrum detection method in cognitive radio is to use a series of tunable narrow band filters and each narrow band filter can only wherein certain subband in whole broadband be detected at radio-frequency front-end.This method needs a large amount of radio frequency parameters, and the tuning range of each filter must preset.
The compressive sensing theory that proposes in recent years and the research in signal processing applications thereof provide a feasible effective way for wide-band spectrum resources detects.Compressive sensing theory is pointed out, for perceived sparse or conversion sparse signal, also can realize the Perfect Reconstruction of signal under the changing down sampling condition.Compressive sensing theory is that the feasibility that broader frequency spectrum detects has been established solid theoretical foundation.
But, in implementing process of the present invention, the inventor finds: in the frequency spectrum resource of reality uses, frequency spectrum resource is assigned to specific wireless user or system with the subband form, and the signal power on different sub-band is to be adjusted according to the signal condition self adaptation of authorized user by authorized base station.The broader frequency spectrum that the perception user detects will be approximate piecewise continuous, and it is low that the power spectral density of each section frequency spectrum has height to have, even if whether adopt the perception of many perception user collaborative also to be difficult to make a certain subband really occupied, be namely a kind of non-zero i.e. judgement of 1 class.The characteristics that this frequency spectrum takies are that can the aware base station decision-making use this subband to bring certain difficulty.
Below list list of references of the present invention, by reference they are incorporated into this, as having done in this manual detailed description.
[1]E.Candès，J.Romberg，and?T.Tao，“Robust?uncertainty?principles：Exact?signal?reconstruction?from?highly?incomplete?frequency?information，”IEEE?Trans.Inf.Theory，vol.52，no.2，pp.489-509，Feb.2006.
[2]J.A.Tropp，A.C.Gilbert，“Signal?recovery?from?random?measurements?via?orthogonal?matching?pursuit”，IEEE?Trans.Inform.Theory，vol.53，pp.4655-4666，2007.
[3]D.Needell，J.A.Tropp，“CoSaMP-Iterative?signal?recovery?from?incomplete?and?inaccurate?samples.”Applied?and?Computational?Harmonic?Analysis，vol.26，pp.301-321，2009.
[4]S.-J.Kim，K.Koh，M.Lustig，S.Boyd，D.Gorinevsky，“A?method?for?l1-regularized?least?squares，”IEEE?J.Select.Top.Signal?Processing，vol.4，pp.606-617，2007.
[5]J.Haupt?and?R.Nowak，“Signal?reconstruction?from?noisy?random?projections，”IEEE?Trans.Info.Theory，vol.52，pp.4036-4048，Sept.2006.
[6]Patent?No.US2010195590A1.Method?and?apparatus?for?radio?spectrum?sensing?or?monitoring.
[7]Patent?No.WO2009125278A1.Method，apparatus?and?computer?program?for?sensing?spectrum?in?a?cognitive?radio?environment.
[8] give the frequency spectrum sensing method of eigenvalue of maximum in Patent No.CN101359930A. cognitive radio system.
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Summary of the invention
The embodiment of the present invention provides a kind of utilization of resources device, method and system for cognitive radio of cognitive radio, purpose is: reduce to greatest extent the interference to authorized user device, and overcome due to the impact of frequency-selective channel decline on frequency spectrum detection.
According to an aspect of the embodiment of the present invention, a kind of utilization of resources device of cognitive radio is provided, described utilization of resources device comprises:
The detected value receiver, it receives the signal strength detection value that a plurality of perception subscriber equipmenies send, and described signal strength detection value obtains after by described perception subscriber equipment, broadband signal being detected;
The estimated value calculator, the signal strength detection value that it sends according to described a plurality of perception subscriber equipmenies is calculated respectively the signal strength signal intensity estimated value for a plurality of subbands of described broadband signal;
Resource allocator, it carries out the resource of broader frequency spectrum and distributes according to the signal strength signal intensity estimated value of described a plurality of subbands.
Another aspect according to the embodiment of the present invention provides a kind of system for cognitive radio, and described system for cognitive radio comprises aware base station and a plurality of perception subscriber equipment, and wherein, described aware base station comprises utilization of resources device as above.
According to another aspect of the embodiment of the present invention, provide a kind of resource utilization method of cognitive radio, described resource utilization method:
Receive the signal strength detection value that a plurality of perception subscriber equipmenies send, described signal strength detection value obtains after by described perception subscriber equipment, broadband signal being detected;
The signal strength detection value that sends according to described a plurality of perception subscriber equipmenies is calculated respectively the signal strength signal intensity estimated value for a plurality of subbands of described broadband signal;
According to the signal strength signal intensity estimated value of described a plurality of subbands, carry out the resource of broader frequency spectrum and distribute.
The beneficial effect of the embodiment of the present invention is: the signal strength detection value that sends by receiving a plurality of perception subscriber equipmenies, and calculate respectively the signal strength signal intensity estimated value for a plurality of subbands of broadband signal, carry out the resource of broader frequency spectrum according to the signal strength signal intensity estimated value of a plurality of subbands and distribute.Can reduce to greatest extent the interference to authorized user device in the distribution of the basic enterprising line frequency spectrum resource of working in coordination with the broader frequency spectrum perception, and overcome due to the impact of frequency-selective channel decline on frequency spectrum detection.
Explanation and accompanying drawing with reference to hereinafter disclose specific implementations of the present invention in detail, and having indicated principle of the present invention can adopted mode.Should be appreciated that, embodiments of the present invention on scope not thereby be restricted.In the scope of the spirit of claims and clause, embodiments of the present invention comprise many changes, revise and are equal to.
Can use in one or more other execution mode in same or similar mode for the feature that a kind of execution mode is described and/or illustrated, combined with the feature in other execution mode, or the feature in alternative other execution mode.
Should emphasize, term " comprises/comprises " existence that refers to feature, whole, step or assembly when this paper uses, but does not get rid of the existence of one or more further feature, whole, step or assembly or additional.
Description of drawings
Fig. 1 is the formation schematic diagram of the utilization of resources device of the embodiment of the present invention;
Fig. 2 is a formation schematic diagram of the resource allocator of the embodiment of the present invention;
Fig. 3 is another formation schematic diagram of the resource allocator of the embodiment of the present invention;
Fig. 4 is the schematic diagram of the system for cognitive radio of the embodiment of the present invention;
Fig. 5 is the formation schematic diagram of the perception subscriber equipment of the embodiment of the present invention;
Fig. 6 is the flow chart of the resource utilization method of the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, various execution modes of the present invention are described.In specification and accompanying drawing, specifically disclose specific implementations of the present invention, it has shown the part execution mode that wherein can adopt principle of the present invention, will be appreciated that, these execution modes are exemplary, are not limitations of the present invention.On the contrary, the present invention includes interior whole modifications, modification and the equivalent of scope that falls into claims.
In existing frequency spectrum resource allocation strategy, the broader frequency spectrum of low service efficiency always is divided into many subbands, if there is frequency spectrum cavity-pocket, frequency spectrum cavity-pocket always occurs with the arrowband form, does not have the appearance in needle-like cavity.Same occupied frequency spectrum is also to occur with the arrowband form, can not exist some wireless systems only to use discontinuous discrete frequency to carry out data communication.
The impact of, undesirable factor uncertain due to the shade that exists in wireless environment, multipath, noise etc., the perception user needs higher detection sensitivity could independently obtain the reliable Detection of broader frequency spectrum.If a plurality of perception users in sensing network can carry out the collaborative detection of frequency spectrum, just can improve the diversity gain of system, reduce the sensitivity requirement of each sensing node, to satisfy system for cognitive radio to high reliability and the hard real-time requirement of faint authorization signal spectrum monitoring.Therefore need a kind of rational perceiving radio network cooperation spectrum detection scheme of design available frequency spectrum resource to be detected rapidly, reliably, realize the allocation strategy of dynamic spectrum resource.
The embodiment of the present invention provides a kind of utilization of resources device of cognitive radio, and Fig. 1 is the formation schematic diagram of the utilization of resources device of the embodiment of the present invention.As shown in Figure 1, this utilization of resources device comprises: detected value receiver 101, estimated value calculator 102 and resource allocator 103.
Wherein, detected value receiver 101 receives the signal strength detection value that a plurality of perception subscriber equipmenies send, and this signal strength detection value obtains after by the perception subscriber equipment, broadband signal being detected; The signal strength detection value that estimated value calculator 102 sends according to a plurality of perception subscriber equipmenies is calculated respectively the signal strength signal intensity estimated value for a plurality of subbands of broadband signal; Resource allocator 103 carries out the resource of broader frequency spectrum and distributes according to the signal strength signal intensity estimated value of a plurality of subbands.
In the present embodiment, this utilization of resources device can be applied to the aware base station side in system for cognitive radio, and this aware base station is the service of a plurality of perception subscriber equipment.And this system for cognitive radio can also comprise authorized base station and authorized user device.
In the present embodiment, each perception subscriber equipment can utilize the sparse characteristic of frequency spectrum resource, detected signal is carried out low rate (far below the sampling rate of Nyquist theorem requirement) sampling, and carry out the reconstruct of signal spectrum structure with the detection algorithm of low complex degree, (for example obtain whole wide-band spectrum resources behaviour in service, whether a certain subband is being authorized to subscriber equipment takies), then estimated result is fed back to aware base station.
Aware base station is carried out information fusion according to each perception subscriber equipment feedack, obtains the estimated value of the signal strength signal intensity on each subband, and this signal strength signal intensity is for example the signal power of authorized user device.Thus, aware base station can automatically take subband the most reliably, realize with the perception subscriber equipment between communicate by letter.And, can possess the ability that self adaptation is adjusted messaging parameter, so that minimum to the interference of authorized user device.
In the specific implementation, suppose that free space is that exist, continued time domain signal perceived broadband is s (t), and the frequency spectrum of s (t) be that bulk is sparse, under Nyquist speed (1/T) sampling condition, the discrete series of signal is:
The frequency domain representation of signal is S
f=[S
0, S
1, L, S
N-1]
T, and have following relation
s
t＝F
HS
f
Wherein, F is Fourier transform matrix.U perception subscriber equipment can utilize the low rate sampler to carry out compression sampling to broadband signal.Because the low rate sampling to broadband signal can be expressed as the stochastic linear observational equation on mathematical description, the low rate sampling can realize by the method for random sampling, also can realize by the method for Stochastic Modulation integration, can also realize by the method that random number multiplies each other.
In the present embodiment, the output sequence of low rate sampler can be expressed as following form
Wherein, h
uBe the transmitter of the authorized base station time domain channel response to u perception subscriber equipment,
Be the domain channel response of authorized base station to u perception subscriber equipment.In following formula, u perception subscriber equipment can only be estimated H
uS
fValue, frequency spectrum that can not the direct-detection authorization signal.If H
uChannel on some subband has experienced deep fade, and namely its frequency domain response is 0 or hour, and u perception subscriber equipment is to can't detect on this subband the authorization signal of existence really, the original intention of this many perception user collaborative just of the present invention perception.
In the present embodiment, all perception subscriber equipmenies can be at compression sampling output sequence s
t uThe basis on, adopt respectively the method for sparse optimization to estimate the frequency domain response of each self-channel and the product value of broadband signal frequency spectrum.The estimation H here
uS
fMethod can be by finding the solution following L-0 or the L-1 minimization problem obtains
Wherein, ε is a less positive number given in advance, can value be 0.01 usually, and experience shows that ε is worth choosing and can't cause on final estimation significant impact.
All perception subscriber equipmenies also can adopt by Iterative detection algorithm, estimate the frequency domain response of each self-channel and the product value of broadband signal frequency spectrum.And the block sparse characteristic of frequency spectrum can play a significant role at the algorithm for estimating that improves based on greedy algorithm one class, as for specifically how carrying out the reconstruct of broadband signal frequency spectrum, can adopt approximate gradient method, CoSaMP algorithm etc.
At this moment, u perception subscriber equipment can be completed H
uS
fEstimation on all subbands, according to the sequence of this estimation, u perception subscriber equipment just can provide the rough judgement that on each frequency, whether authorization user signal exists.But due to error and the deviation that may occur in the impact of channel and estimation procedure, the judgement that make this moment and insufficient accurately.
On the other hand, due to the spectrum allocation may of authorized user device always with subband (for example, be generally the integral multiple of 2MHz or 5MHz) form carry out, for this reason, each perception subscriber equipment only need to provide an average power content and get final product on each subband, specifically can realize by following form
In following formula, the hypothesis broader frequency spectrum has been divided into K subband, and each subband occupies approximately
Individual frequency.Thus, the perception subscriber equipment can obtain the signal strength detection value on a certain subband of broader frequency spectrum.
In the present embodiment, all perception subscriber equipmenies can not made hard decision to the existence of the authorization user signal of detect on each subband, but the signal strength detection value on each subband (for example, with after average power information process quantization encoding) is fed back to aware base station.
Thus, the detected value receiver 101 of aware base station can receive the signal strength detection value that a plurality of perception subscriber equipmenies send, and this signal strength detection value obtains after by the perception subscriber equipment, broadband signal being detected.
In the present embodiment, the signal strength detection value that the estimated value calculator 102 of aware base station can send according to a plurality of perception subscriber equipmenies is calculated respectively the signal strength signal intensity estimated value for a plurality of subbands of broadband signal;
In the specific implementation, estimated value calculator 102 specifically can be used for: for each subband, signal strength detection value that a plurality of perception subscriber equipmenies are sent, on this subband is weighted on average, to obtain the signal strength signal intensity estimated value on this subband.
Thus, the mode that aware base station adopts weighting to merge obtains the power information of authorization user signal on each subband, and the diversity gain that this moment, a plurality of perception subscriber equipmenies provided can be eliminated the impact of the channel fading that authorization user signal is subject to a great extent.The weighting merging mode that aware base station is used for the average power signal of k subband of estimation can be expressed as
Wherein, α
uBe the weight coefficient to u perception subscriber equipment.This weight coefficient can be determined to u perception user's channel average power according to authorized base station or authorized user; Also can simply be made as complete 1 sequence.But be not limited to this, can also determine according to each perception user's reliability, may also comprise the order of accuarcy etc. of the affiliated perception field feedback of priori.
It should be noted that it is only a specific embodiment of the present invention that estimated value calculator 102 adopts average weighted mode, but be not limited to this.For example can also adopt weighted sum etc., can determine concrete mode according to actual conditions.
In the present embodiment, resource allocator 103 can carry out the resource of broader frequency spectrum and distribute according to the signal strength signal intensity estimated value of a plurality of subbands.
In one embodiment, can take situation to subband and carry out hard decision.Fig. 2 is a formation schematic diagram of the resource allocator of the embodiment of the present invention, and as shown in Figure 2, resource allocator 103 specifically can comprise: hard decision device 201 and sub band resources determiner 202.
Wherein, hard decision device 201 whether greater than predetermined threshold value, judges whether this subband is available according to the signal strength signal intensity estimated value on each subband; When sub band resources determiner 202 judges that at hard decision device 201 this subband is available, determine size or the data modulation coding mode of transmitting power on this subband.
Particularly, aware base station has obtained the estimated value of subband signal power comparatively accurately, just can make hard decision, namely
Wherein, threshold value P
ThresholdCan be empirical value, also can determine by the transmitting power of authorized base station and the channel circuit loss value between authorized base station and perception subscriber equipment etc.
Generally, P no matter
ThresholdHow choosing, in following formula, hard decision always exists certain false alarm probability and alarm dismissal probability, and these two probable values depend on P
ThresholdChoose and
Probability distribution.
In another embodiment, can take situation to subband and carry out soft-decision.Fig. 3 is another formation schematic diagram of the resource allocator of the embodiment of the present invention, and as shown in Figure 3, resource allocator 103 specifically can comprise: soft-decision device 301 and sub band resources determiner 302.
Wherein, soft-decision device 301 is according to the signal strength signal intensity estimated value on each subband, calculate broadband signal a plurality of subbands be used probability; Sub band resources determiner 302 is according to the resource distribution that probability is determined a plurality of subbands that is used that calculates.
Further, sub band resources determiner 302 specifically can be used for: according to being used probability, a plurality of subbands are sorted; Determine size or the data modulation coding mode of transmitting power on each subband according to ranking results.
In the specific implementation, aware base station does not take situation to sub-band channel and directly makes judgement, but according to their relative value size, determines the parameters such as selection, power division and data modulation coding mode of the subband that sensing network signal post takies.
For example, if system for cognitive radio need to take K at most
sIndividual subband is to all K
Sort and suppose
System for cognitive radio can take subband and be numbered k
1, k
2, L,
On the other hand, if
Be worth less, the possibility that this subband is authorized to the subscriber equipment use is less, system for cognitive radio has larger probability, and this subband successfully to be detected be frequency spectrum cavity-pocket, thereby when the subband power division, should distribute larger transmitting power and adopt higher modulation coding mode on this subband, to transmit more information bit.
Otherwise, if
Be worth larger, the possibility that this subband is authorized to the subscriber equipment use is larger, system for cognitive radio is take larger this subband of probability false judgment as frequency spectrum cavity-pocket, thereby when the subband power division, should distribute less transmitting power and adopt less modulation coding mode on this subband, in order to prevent because possible erroneous judgement causes interference to authorized user.
By above-described embodiment as can be known, the signal strength detection value that sends by receiving a plurality of perception subscriber equipmenies, and calculate respectively the signal strength signal intensity estimated value for a plurality of subbands of broadband signal, carry out the resource of broader frequency spectrum according to the signal strength signal intensity estimated value of a plurality of subbands and distribute.Can reduce to greatest extent the interference to authorized user device in the distribution of the basic enterprising line frequency spectrum resource of working in coordination with the broader frequency spectrum perception, and overcome due to the impact of frequency-selective channel decline on frequency spectrum detection.
The embodiment of the present invention also provides a kind of system for cognitive radio, and this system for cognitive radio comprises aware base station and a plurality of perception subscriber equipment, and wherein, aware base station comprises utilization of resources device as above.
Fig. 4 is the schematic diagram of the system for cognitive radio of the embodiment of the present invention, and as shown in Figure 4, system for cognitive radio can comprise aware base station 401, perception subscriber equipment 402; In addition, can also comprise authorized base station 403 and authorized user device 404.
Fig. 5 is the formation schematic diagram of the perception subscriber equipment of the embodiment of the present invention, and as shown in Figure 5, perception subscriber equipment 402 can comprise: low rate sampler 501, frequency spectrum reconfiguration device 502 and detected value transmitter 503.
Wherein, 501 pairs of broadband signals of low rate sampler are to sample lower than the desired sampling rate of Nyquist sampling thheorem; Frequency spectrum reconfiguration device 502 utilizes the sparse characteristic of signal to carry out the reconstruct of signal spectrum structure according to sample sequence and prearranged signal degree of rarefication that low rate sampler 501 obtains, to obtain the signal strength detection value of broadband signal; Detected value transmitter 503 sends the signal strength detection value to aware base station 401.
Further, the broadband signal frequency spectrum can be divided into a plurality of subbands, and frequency spectrum reconfiguration device 502 specifically can be used for: the signal strength detection value that obtains a plurality of subbands.And for the signal strength detection value on discrete frequency, frequency spectrum reconfiguration device 502 can operate by smothing filtering and revise.
In the specific implementation, frequency spectrum reconfiguration device 502 can carry out the reconstruct of signal spectrum structure by L-0 norm optimization or L-1 norm optimization.Preferably, can adopt compression sampling match tracing (CoSaMP) algorithm to carry out the reconstruct of signal spectrum structure.
By above-described embodiment as can be known, in the perception user equipment side, have under the block sparse characteristics that take at known broadband signal frequency spectrum, can sample based on the low rate of carrying out of stochastical sampling strategy.And the perception subscriber equipment of a plurality of collaborative works can complete independently broader frequency spectrum perception task separately, and with the result feedback of frequency spectrum detection to aware base station.
Aware base station can obtain the estimation more accurately of the authorized user device signal strength signal intensity on each subband after the signal strength detection value of a plurality of perception subscriber equipment feedbacks is calculated (for example weighted average).Aware base station can reduce the interference that may cause authorized user when taking possible frequency spectrum cavity-pocket.Thus, system for cognitive radio of the present invention has that the broader frequency spectrum perception is strong, system complexity is low, the system reliability advantages of higher.
The embodiment of the present invention also provides a kind of resource utilization method of cognitive radio, and Fig. 6 is the flow chart of the resource utilization method of the embodiment of the present invention, and as shown in Figure 6, this resource utilization method comprises:
Step 601 receives the signal strength detection value that a plurality of perception subscriber equipmenies send, and this signal strength detection value obtains after by the perception subscriber equipment, broadband signal being detected;
Step 602, the signal strength detection value that sends according to a plurality of perception subscriber equipmenies is calculated respectively the signal strength signal intensity estimated value for a plurality of subbands of broadband signal;
Step 603 according to the signal strength signal intensity estimated value of a plurality of subbands, is carried out the resource of broader frequency spectrum and is distributed.
In the specific implementation, step 602 specifically can comprise: for each subband, signal strength detection value that a plurality of perception subscriber equipmenies are sent, on this subband is weighted on average, to obtain the signal strength signal intensity estimated value on this subband.
Further, for each perception subscriber equipment, average weighted weight coefficient can be determined to the channel average power of this perception subscriber equipment according to authorized base station or authorized user device.
In one embodiment, can use hard decision in step 603, the resource of carrying out broader frequency spectrum is distributed and specifically can be comprised: whether greater than predetermined threshold value, judge whether this subband is available according to the estimated value of the signal strength signal intensity on each subband; When judging that this subband is available, determine size or the data modulation coding mode of transmitting power on this subband.
In another embodiment, can use soft-decision in step 603, the resource of carrying out broader frequency spectrum is distributed and specifically to be comprised: according to the estimated value of the signal strength signal intensity on each subband, calculate broadband signal a plurality of subbands be used probability; According to the resource distribution that probability is determined a plurality of subbands that is used that calculates.
Further, determine that according to the probability that is used that calculates the resource distribution of a plurality of subbands specifically comprises: according to being used probability, a plurality of subbands are sorted; Determine size or the data modulation coding mode of transmitting power on each subband according to ranking results.
In the specific implementation, can be according to the inverse ratio of the signal strength signal intensity estimated value of each subband, carry out power and the scheduling probability assignments of each subband, the subband that the power of distribution is high uses the high modulation coding mode of speed, and the subband that power is low uses the low modulation coding mode of speed.
In the present embodiment, the perception subscriber equipment does not take situation to each subband spectrum and adjudicates, but the signal strength detection value of the frequency spectrum of each subband of perceive is fed back to aware base station, aware base station is carried out fusion calculation (for example weighted average) with a plurality of perception subscriber equipment feedacks, obtains the information more comprehensively that each subband takies situation.
When aware base station uses subband to carry out data communication, can consider authorized user device distributes at the power of each subband, the parameters such as the idle subband of dynamic, adaptive distribution, signal power in aware base station and perception communications of user equipment process are so that the minimum interference that system for cognitive radio causes authorized user device.
By above-described embodiment as can be known, the signal strength detection value that sends by receiving a plurality of perception subscriber equipmenies, and calculate respectively the signal strength signal intensity estimated value for a plurality of subbands of broadband signal, carry out the resource of broader frequency spectrum according to the signal strength signal intensity estimated value of a plurality of subbands and distribute.Can reduce to greatest extent the interference to authorized user device in the distribution of the basic enterprising line frequency spectrum resource of working in coordination with the broader frequency spectrum perception, and overcome due to the impact of frequency-selective channel decline on frequency spectrum detection.
The above apparatus and method of the present invention can be realized by hardware, also can be realized by combination of hardware software.The present invention relates to such computer-readable program, when this program is performed by logical block, can make this logical block realize device mentioned above or component parts, or make this logical block realize the whole bag of tricks mentioned above or step.The invention still further relates to be used to the storage medium of storing above program, as hard disk, disk, CD, DVD, flash memory etc.
Invention has been described for the concrete execution mode of above combination, but it will be apparent to those skilled in the art that these descriptions are all exemplary, is not limiting the scope of the invention.Those skilled in the art can make various variants and modifications to the present invention according to spirit of the present invention and principle, and these variants and modifications also within the scope of the invention.
About comprising the execution mode of above embodiment, following remarks is also disclosed:
The utilization of resources device of (remarks 1) a kind of cognitive radio, described utilization of resources device comprises:
The detected value receiver, it receives the signal strength detection value that a plurality of perception subscriber equipmenies send, and described signal strength detection value obtains after by described perception subscriber equipment, broadband signal being detected;
The estimated value calculator, the signal strength detection value that it sends according to described a plurality of perception subscriber equipmenies is calculated respectively the signal strength signal intensity estimated value for a plurality of subbands of described broadband signal;
Resource allocator, it carries out the resource of broader frequency spectrum and distributes according to the signal strength signal intensity estimated value of described a plurality of subbands.
(remarks 2) utilization of resources device described according to remarks 1, wherein, described estimated value calculator specifically is used for: for each subband, signal strength detection value that described a plurality of perception subscriber equipmenies are sent, on described subband is weighted on average, to obtain the signal strength signal intensity estimated value on described subband.
(remarks 3) utilization of resources device described according to remarks 2, wherein, described average weighted weight coefficient is determined to the channel average power of described perception subscriber equipment according to authorized base station or authorized user device.
(remarks 4) utilization of resources device described according to remarks 1, wherein, described resource allocator specifically comprises:
The hard decision device, it whether greater than predetermined threshold value, judges whether described subband is available according to the described signal strength signal intensity estimated value on each subband;
The sub band resources determiner when it judges that at described hard decision device described subband is available, is determined size or the data modulation coding mode of transmitting power on described subband.
(remarks 5) utilization of resources device described according to remarks 1, wherein, described resource allocator specifically comprises:
The soft-decision device, it calculates the probability that is used of a plurality of subbands of described broadband signal according to the described signal strength signal intensity estimated value on each subband;
The sub band resources determiner, it is according to the resource distribution that probability is determined described a plurality of subbands that is used that calculates.
(remarks 6) utilization of resources device described according to remarks 5, wherein, described sub band resources determiner specifically is used for: according to the described probability that is used, described a plurality of subbands are sorted; Determine size or the data modulation coding mode of transmitting power on each subband according to ranking results.
(remarks 7) a kind of system for cognitive radio, described system for cognitive radio comprise aware base station and a plurality of perception subscriber equipment, and wherein, described aware base station comprises as remarks 1 to the 6 described utilization of resources device of any one.
(remarks 8) system for cognitive radio described according to remarks 7, wherein, described perception subscriber equipment comprises:
The low rate sampler, its to broadband signal to sample lower than the desired sampling rate of nyquist sampling theorem;
The frequency spectrum reconfiguration device, it utilizes the sparse characteristic of signal to carry out the reconstruct of signal spectrum structure according to sample sequence and prearranged signal degree of rarefication that described low rate sampler obtains, to obtain the signal strength detection value of described broadband signal;
The detected value transmitter, its signal strength detection value with described broadband signal sends to described aware base station.
(remarks 9) system for cognitive radio described according to remarks 8, wherein, described broadband signal frequency spectrum is divided into a plurality of subbands, and described frequency spectrum reconfiguration implement body is used for: the signal strength detection value that obtains described a plurality of subbands.
(remarks 10) system for cognitive radio described according to remarks 9, wherein, described frequency spectrum reconfiguration implement body also is used for: for the signal strength detection value on discrete frequency, operate by smothing filtering and revise.
(remarks 11) system for cognitive radio described according to remarks 8, wherein, described frequency spectrum reconfiguration device carries out the reconstruct of signal spectrum structure by L-0 norm optimization or L-1 norm optimization.
(remarks 12) system for cognitive radio described according to remarks 8, wherein, described frequency spectrum reconfiguration device adopts the compression sampling matching pursuit algorithm to carry out the reconstruct of signal spectrum structure.
The resource utilization method of (remarks 13) a kind of cognitive radio, described resource utilization method:
Receive the signal strength detection value that a plurality of perception subscriber equipmenies send, described signal strength detection value obtains after by described perception subscriber equipment, broadband signal being detected;
The signal strength detection value that sends according to described a plurality of perception subscriber equipmenies is calculated respectively the signal strength signal intensity estimated value for a plurality of subbands of described broadband signal;
According to the signal strength signal intensity estimated value of described a plurality of subbands, carry out the resource of broader frequency spectrum and distribute.
(remarks 14) resource utilization method described according to remarks 13, wherein, calculate respectively the signal strength signal intensity estimated value for a plurality of subbands of described broader frequency spectrum and specifically comprise:
For each subband, signal strength detection value that described a plurality of perception subscriber equipmenies are sent, on described subband is weighted on average, to obtain the signal strength signal intensity estimated value on described subband.
(remarks 15) resource utilization method described according to remarks 14, wherein, described average weighted weight coefficient is determined to the channel average power of described perception subscriber equipment according to authorized base station or authorized user device.
(remarks 16) resource utilization method described according to remarks 13, wherein, the resource distribution of carrying out described broader frequency spectrum specifically comprises:
Whether greater than predetermined threshold value, judge whether described subband is available according to the estimated value of the described signal strength signal intensity on each subband;
When judging that described subband is available, determine size or the data modulation coding mode of transmitting power on described subband.
(remarks 17) resource utilization method described according to remarks 13, wherein, the resource distribution of carrying out described broader frequency spectrum specifically comprises:
According to the estimated value of the described signal strength signal intensity on each subband, calculate the probability that is used of a plurality of subbands of described broadband signal;
According to the resource distribution that probability is determined described a plurality of subbands that is used that calculates.
(remarks 18) resource utilization method described according to remarks 17, wherein, determine that according to the probability that is used that calculates the resource distribution of described a plurality of subbands specifically comprises:
According to the described probability that is used, described a plurality of subbands are sorted;
Determine size or the data modulation coding mode of transmitting power on each subband according to ranking results.
(remarks 19) a kind of computer-readable program, wherein when carrying out described program in the base station, described program makes computer carry out resource utilization method as described in any one in remarks 13-18 in described base station.
(remarks 20) a kind of storage medium that stores computer-readable program, wherein said computer-readable program make computer carry out resource utilization method as described in any one in remarks 13-18 in the base station.
Claims (10)
1. the utilization of resources device of a cognitive radio, described utilization of resources device comprises:
The detected value receiver, it receives the signal strength detection value that a plurality of perception subscriber equipmenies send, and described signal strength detection value obtains after by described perception subscriber equipment, broadband signal being detected;
The estimated value calculator, the signal strength detection value that it sends according to described a plurality of perception subscriber equipmenies is calculated respectively the signal strength signal intensity estimated value for a plurality of subbands of described broadband signal;
Resource allocator, it carries out the resource of broader frequency spectrum and distributes according to the signal strength signal intensity estimated value of described a plurality of subbands.
2. utilization of resources device according to claim 1, wherein, described estimated value calculator specifically is used for: for each subband, signal strength detection value that described a plurality of perception subscriber equipmenies are sent, on described subband is weighted on average, to obtain the signal strength signal intensity estimated value on described subband.
3. utilization of resources device according to claim 2, wherein, described average weighted weight coefficient is determined to the channel average power of described perception subscriber equipment by authorized base station or authorized user device.
4. utilization of resources device according to claim 1, wherein, described resource allocator specifically comprises:
The hard decision device, it whether greater than predetermined threshold value, judges whether described subband is available according to the described signal strength signal intensity estimated value on each subband;
The sub band resources determiner when it judges that at described hard decision device described subband is available, is determined size or the data modulation coding mode of transmitting power on described subband.
5. utilization of resources device according to claim 1, wherein, described resource allocator specifically comprises:
The soft-decision device, it is according to the described signal strength signal intensity estimated value on each subband, calculates the probability that is used of a plurality of subbands on described broadband signal;
The sub band resources determiner, it is according to the resource distribution that probability is determined described a plurality of subbands that is used that calculates.
6. utilization of resources device according to claim 5, wherein, described sub band resources determiner specifically is used for: according to the described probability that is used, described a plurality of subbands are sorted; Determine size or the data modulation coding mode of transmitting power on each subband according to ranking results.
7. system for cognitive radio, described system for cognitive radio comprises aware base station and a plurality of perception subscriber equipment, wherein, described aware base station comprises utilization of resources device as described in claim 1 to 6 any one.
8. system for cognitive radio according to claim 7, wherein, described perception subscriber equipment comprises:
The low rate sampler, its to broadband signal to sample lower than the desired sampling rate of nyquist sampling theorem;
The frequency spectrum reconfiguration device, it utilizes the sparse characteristic of signal to carry out the reconstruct of signal spectrum structure according to sample sequence and prearranged signal degree of rarefication that described low rate sampler obtains, to obtain the signal strength detection value of described broadband signal;
The detected value transmitter, it sends described signal strength detection value to described aware base station.
9. the resource utilization method of a cognitive radio, described resource utilization method:
Receive the signal strength detection value that a plurality of perception subscriber equipmenies send, described signal strength detection value obtains after by described perception subscriber equipment, broadband signal being detected;
The signal strength detection value that sends according to described a plurality of perception subscriber equipmenies is calculated respectively the signal strength signal intensity estimated value for a plurality of subbands of described broadband signal;
According to the signal strength signal intensity estimated value of described a plurality of subbands, carry out the resource of broader frequency spectrum and distribute.
10. resource utilization method according to claim 9, wherein, calculate respectively the signal strength signal intensity estimated value for a plurality of subbands of described broadband signal and specifically comprise:
For each subband, signal strength detection value that described a plurality of perception subscriber equipmenies are sent, on described subband is weighted on average, to obtain the signal strength signal intensity estimated value on described subband.
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