CN108540247A - Frequency spectrum perception and information transferring method with collection of energy in cognition wireless network - Google Patents
Frequency spectrum perception and information transferring method with collection of energy in cognition wireless network Download PDFInfo
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Abstract
Frequency spectrum perception and information transferring method with collection of energy in cognition wireless network of the present invention, cognitive user carries out frequency spectrum perception and collection of energy using the signal for carrying out primary user transmitter, and the energy being collected into is transmitted for information, in detection primary user's stage, whether cognitive user and the common detection primary user of N number of cognition relaying occupy frequency spectrum, in the report stage, cognitive user according to itself whether detect primary user occupy frequency spectrum, open collection of energy or Function of Information Fusion, the stage is transmitted in information, according to frequency spectrum perception final decision result, cognitive user carries out collection of energy or information transmission.The present invention provides work capacity while obtaining high frequency spectrum perception performance for cognitive user, extends the service life of cognitive user, reduces or is replaced without periodic battery.
Description
Technical field
The present invention relates to the frequency spectrum perceptions and information transferring method with collection of energy in a kind of cognition wireless network, belong to and recognize
Know technical field of radio.
Background technology
Traditional wireless communication uses fixed frequency spectrum distributing method, and government is these resource allocations to authorized user or use
To be a big geographic area service for a long time, but these availability of frequency spectrums authorized are very low.Cognitive radio
(cognitive radio) can solve growing rare with the frequency spectrum, utilization rate of spectrum requirement it is low between contradiction.It allows
Unauthorized user (Secondary User, also referred to as cognitive user) insertion authority user (Primary User, also referred to as primary user)
Frequency spectrum.Wherein, the case where cognitive user uses frequency spectrum using frequency spectrum perception technology detection primary user, to find that primary user does not make
Spectrum interposition (spectrum hole) then carries out the data transmission between cognitive user using the spectrum interposition being found.
And when primary user occurs using frequency spectrum again, cognitive user must concede this section of frequency spectrum, to protect the Service Quality of primary user
(QoS) demand of measuring.
Collection of energy (energy harvesting) is closed as a kind of green energy conservation technology by industrial quarters and academia extensively
Note.The collection of energy of wireless network refers to communication node from ambient enviroment, such as the sun, wind, heat and space radiofrequency signal, collects energy
Amount works for node.Above-mentioned to carry when primary user occurs using frequency spectrum again, cognitive user must concede this section of frequency spectrum
Problem, so that it may to utilize energy collection technology, the signal collection emitted when by primary user at this time using frequency spectrum, for cognition
User job energy source.For the radiofrequency signal for making full use of primary user to be emitted, there is document《Collect primary user's signal energy
The handling capacity of cognitive radio networks》(Bhowmick,S.Roy,and S.Kundu,“Throughput of a cognitive
radio network with energy-harvesting based on primary user signal,”IEEE
Wireless Commun.Lett., vol.5, no.2, pp.136-139, Apr.2016.) frequency spectrum perception and collection of energy is same
When cognitive nodes complete, that is, utilize power distributing circuit, radio node realize simultaneously information reception and collection of energy.
However, if the radio frequency energy that primary user is emitted, frequency is carried out at the same time after being divided in portion by cognitive nodes
Spectrum perception and collection of energy, then since power sharing ratio is less than 1 so that the energy for frequency spectrum perception is reduced.This can be influenced
The decline of frequency spectrum perception performance especially becomes apparent from the performance influence for using energy detection method to carry out frequency spectrum perception, because of energy
Whether the principle of amount detection is exactly according to reception signal energy size compared with threshold value, to determine primary user using frequency spectrum
's.Similarly, the quantity for the energy being collected into can also be reduced.
Invention content
In order to solve the above technical problem, the present invention provides the frequency spectrum senses with collection of energy in a kind of cognition wireless network
Know and information transferring method.
In order to achieve the above object, the technical solution adopted in the present invention is：
Frequency spectrum perception and information transferring method with collection of energy in cognition wireless network,
In detection primary user's stage, whether cognitive user and the common detection primary user of N number of cognition relaying occupy frequency spectrum；
If cognitive user detects that primary user occupies frequency spectrum：In the report stage, cognitive user collects primary user's transmitter
Radio frequency energy collects the local detection consequential signal energy of K cognition repeat transmitted, wherein K cognition relaying detects
The vacant frequency spectrum of primary user, K≤N；It is transmitted the stage in information, cognitive user collects the radio frequency energy of primary user's transmitter；
If cognitive user detects the vacant frequency spectrum of primary user：In the report stage, cognitive user receives secondary in K cognition
The local detection consequential signal penetrated, cognitive user will receive and K1 local detection result being successfully decoded and N-K1 acquiescence
Value is merged, and judges whether primary user occupies frequency spectrum according to fusion results, wherein K cognition relaying detects primary user not
Occupy frequency spectrum, K≤N, K1≤K；If fusion results judgement is main user occupancy frequency spectrum, transmitted the stage in information, cognition is used
Collect the radio frequency energy of primary user's transmitter in family；If fusion results judgement is the vacant frequency spectrum of primary user, in information
Transmission stage, cognitive user utilize the primary user's spectrum communication detected.
Whether cognitive user and cognition relaying occupy frequency spectrum using the method detection primary user of energy measuring, that is, receive master
The energy value of the radiofrequency signal of user transmitter in a certain period of time, by it compared with preset energy threshold, according to comparing
As a result it makes decisions, to obtain local detection result；Wherein, it is pre- to be more than cognition relaying for the preset energy threshold of cognitive user
If energy threshold.
The cognition relaying for detecting the vacant frequency spectrum of primary user, using the primary user's frequency spectrum detected, by local detection knot
Fruit signal is sent to cognitive user；The primary user's frequency spectrum being wherein detected is divided into N number of subchannel, and each cognition relaying occupies 1
Sub-channels；It recognizes the transmission power of relaying simultaneously and local detection probability needs to meet certain constraints.
It detects that primary user occupies the cognition relaying of frequency spectrum, does not send testing result to cognitive user, but be transformed into not
Dormancy energy saver mode, until next frequency spectrum perception period arrives.
The conclusive judgement method whether primary user occupies frequency spectrum is, if the local detection result of cognitive user is primary user
Frequency spectrum is occupied, then the testing result is final judging result；If cognitive user local detection result is that primary user is vacant
Frequency spectrum, then cognitive user provide conclusive judgement according to fusion results as fusion center.
The process that cognitive user collects energy includes following two parts：First, occupying frequency spectrum, and cognitive user in primary user
When the fact that also detecting that, cognitive user is collected simultaneously in the report stage from K local detection consequential signal energy and master
The radio frequency energy of user transmitter continues to collect the radio frequency for carrying out primary user transmitter in information transmission stage cognitive user
Signal energy；Second is that frequency spectrum is occupied in primary user, but the fact that cognitive user is not detected, and merge K1 local detection knot
When the fact that conclusive judgement is found after fruit and N-K1 default value, cognitive user is collected in the information transmission stage carrys out primary user
The radio frequency energy of transmitter.
The gross energy that cognitive user is collected into is represented by：
Wherein, EhFor the gross energy being collected into, T is the period that frequency spectrum perception and information are transmitted, and η is energy conversion efficiency, 0
＜ η ＜ 1, PaFor the probability of the vacant frequency spectrum of primary user, PrFor the transmission power of cognition relaying, PpFor the hair of main user transmitter
Penetrate power, ρiFor the suspend mode probability of i-th of cognition relaying, PdsFor the local detection probability of cognitive user, | hrs|2It is relayed for cognition
To the channel gain of cognitive user, | hps|2For the channel gain of primary user to cognitive user, PdFAt cognitive user after fusion
Global detection probability, τDAnd τRRespectively detect the expense in primary user's stage and report stage, 0 ＜ τD1,0 ＜ τ of ＜R＜ 1.
The advantageous effect that the present invention is reached：The present invention utilizes the radiofrequency signal of primary user's transmitter, completes frequency spectrum perception,
Collection of energy is carried out to it again, the method being combined using cognitive user and more cognition relay cooperative frequency spectrum perceptions, primary
When family transmitting signal is strong, cognitive user testing result is final detection result, improves detection efficiency；Emit in primary user and believes
When number weak, the reliabilities for recognizing relay cooperative frequency spectrum perceptions (merging) and improving testing result, the energy being collected simultaneously was both more
Include the radiofrequency signal of primary user's transmitter, also includes the local detection consequential signal that more cognition relayings are sent, make the energy of collection
Amount quantity is increased, and such present invention can either improve the detection probability to primary user, and can extend cognitive user
Service life is reduced or is replaced without periodic battery.
Description of the drawings
Fig. 1 is the Coexistence Model of cognition wireless network and primary user's network,
Fig. 2 is the time slot map of the present invention；
Fig. 3 is the flow chart of the present invention；
Fig. 4 is the global false-alarm probability and detection probability performance map of the present invention；
Fig. 5 is collection and the consumption energy characteristics figure of the present invention.
Specific implementation mode
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and not intended to limit the protection scope of the present invention.
As shown in Figure 1, primary user's transmitter PUTWith receiver PURIn primary user's network, there is one in cognition wireless network
A cognitive user SU and N number of cognition relaying, are expressed as { SRi| i=1,2 ..., N }, wherein SU has collection space radiofrequency signal
The function of energy, Fig. 2 are time slot map, and the period that frequency spectrum perception and information are transmitted is T, is divided into detection primary user's rank in chronological order
Section, report stage and data transfer phase, time are respectively τDT、τRT and (1- τD-τR) T, τDAnd τRRespectively detect primary user
The expense in stage and report stage, 0 ＜ τD1,0 ＜ τ of ＜R＜ 1.
As shown in figure 3, frequency spectrum perception and information transferring method with collection of energy in cognition wireless network, specific as follows：
1) detect whether primary user occupies frequency jointly in detection primary user's stage, cognitive user SU and N number of cognition relaying SR
Spectrum.
Whether cognitive user and cognition relaying occupy frequency spectrum using the method detection primary user of energy measuring, that is, receive master
The energy value of the radiofrequency signal of user transmitter in a certain period of time, by it compared with preset energy threshold, according to comparing
As a result it makes decisions, to obtain local detection result, wherein it is pre- that the preset energy threshold of cognitive user is more than cognition relaying
If energy threshold.
If i-th of cognition relaying SRiThe radio frequency energy for receiving primary user's transmitter is εi, then SRiDecision rule
For,
Wherein, λ1For SRiIn preset energy threshold,WithIndicate that cognitive user judgement primary user occupies frequency respectively
Spectrum and vacant frequency spectrum, H1And H0Indicate that primary user occupies frequency spectrum and vacant frequency spectrum respectively；
SRiLocal detection probability and false-alarm probability be expressed as,
Wherein, Pdi(λ1) it is SRiLocal detection probability, Pfi(λ1) it is SRiFalse-alarm probability, Pr { } indicate conditional probability,
U=BT τDFor time-bandwidth product, T is the bandwidth of main user occupancy frequency spectrum, γiFor SRiThe radiofrequency signal signal-to-noise ratio received, Γ
() is non-fully gamma functions,
Because the noise variance of Different Cognitive relaying is identical, there is Pf1(λ1)=Pf2(λ1)=...=PfN(λ1), below
Use Pf(λ1) replace Pfi(λ1).But due to γiValue it is different, local detection probability cannot do same simplification.
Equally, ε is usedsIndicating that SU receives the radio frequency energy of primary user's transmitter, then the decision rule of SU is,
Wherein, λ2For preset energy threshold in SU, and λ2＞ λ1, then the local detection probability of SU and false-alarm probability are distinguished
It is expressed as,
Wherein, γsFor the radiofrequency signal signal-to-noise ratio that SU is received,
If 2) cognitive user detects that primary user occupies frequency spectrum, the radiofrequency signal of this meaning primary user's transmitter is very strong, i.e.,
Primary user is very strong to the interference of cognitive user, then does not consider the local detection result of cognition relaying and directly make conclusive judgement,
I.e. primary user occupies frequency spectrum, and the global detection probability of cognitive user and false-alarm probability are respectively at this time,
PdG=Pds(λ2) (1)
PfG=Pfs(λ2) (2)
And in the next report stage, cognitive user collects the radio frequency energy of primary user's transmitter, collects K and recognizes
Know the local detection consequential signal energy of repeat transmitted, wherein K cognition relaying detects the vacant frequency spectrum of primary user, K≤N；
It is then transmitted the stage in information, cognitive user collects the radio frequency energy of primary user's transmitter.
The cognition relaying for detecting the vacant frequency spectrum of primary user, carries out cyclic redundancy code, then to local detection result
Using the primary user's frequency spectrum detected, the local detection consequential signal obtained after coding is sent to cognitive user.In order to avoid
Multiple cognitions relay while causing to interfere with each other when sending signal, and the primary user's frequency spectrum being detected is divided into N number of subchannel, each
Cognition relaying occupies 1 sub-channels.
It detects that primary user occupies the cognition relaying of frequency spectrum, does not emit local detection consequential signal to cognitive user, to keep away
Exempt to interfere primary user's communication, but be transformed into suspend mode, to save energy dissipation, until next frequency spectrum perception week
Phase arrives；Wherein i-th cognition relaying SRiSuspend mode probability ρiFor,
ρi=Pr { εi≥λ1}=Pr { εi≥λ1|H1}Pr{H1}+Pr{εi≥λ1|H0}Pr{H0}
=Pdi(λ1)(1-Pa)+Pf(λ1)Pa
In formula, Pa={ H0Be the vacant frequency spectrum of primary user probability.
When cognition relaying detects that this result of the vacant frequency spectrum of primary user is flase drop, (i.e. actually primary user is accounting for
With frequency spectrum, and recognize relaying and be mistakenly detected as the vacant frequency spectrum of primary user), cognition relaying sends local detection to cognitive user
Consequential signal can be interfered caused by primary user's receiver.This interference is limited, to protect the positive normal open of primary user
Letter.Primary user's normal communication needs the Transmission probability P for meeting primary userPUoutLess than predetermined threshold value Pout_th, i.e. PPUout
≤Pout_th.Primary user's Transmission probability can be expressed as,
Wherein, SIR is the signal-to-noise ratio that main receiver user receives, SIRthFor the signal interference of main receiver user
Than thresholding, PpFor the transmission power of main user transmitter,The channel gain mean value of primary user's receiver is relayed to for cognition,For the channel gain mean value of main user transmitter to primary user's receiver, PrFor the transmission power of cognition relaying.
As above formula as it can be seen that the interference caused by primary user's receiver of cognition relaying, can recognize the transmitting of relaying by reducing
Power and increase recognize the local detection probability of relaying to control.
3) if cognitive user detects the vacant frequency spectrum of primary user, it means that the radiofrequency signal of primary user's transmitter is not
Very strong, at this time in order to improve the reliability of testing result, cognitive user receives K and recognizes repeat transmitted as fusion center
Local detection consequential signal, cognitive user will receive and K1 local detection result being successfully decoded and N-K1 default value,
Judging whether primary user occupies frequency spectrum according to fusion results, wherein K cognition, which relays, detects the vacant frequency spectrum of primary user, K≤
N has K1 local detection result to be received and be successfully decoded, K-K1 local detection result reception failure (as interrupted),
N-K is a not to cognitive user transmitting local detection consequential signal, reception failure or without sending local detection consequential signal,
Cognitive user can set a default value, i.e. N-K1 default value.If judgement primary user occupies frequency spectrum after fusion, passed in information
Defeated stage, cognitive user collect the radio frequency energy of primary user's transmitter；Otherwise, it is transmitted the stage in information, cognitive user profit
With the primary user's spectrum communication detected.
For cognitive user as fusion center, its amalgamation judging method is as follows：
Define HisIndicate the event that the local detection consequential signal that i-th of cognition relaying of cognitive user pair is sent does to adjudicate,
H is used when the local detection consequential signal court verdict that i-th of cognition relaying of cognitive user pair is sent is main user occupancy frequency spectrumis
=1 indicates, when the local detection consequential signal court verdict that i-th of cognition relaying of cognitive user pair is sent is that primary user is vacant
H is used when frequency spectrumis=0 indicates.DsuIndicate the conclusive judgement event after the local court verdict of cognitive user fusion cognition relaying, when
Conclusive judgement after fusion uses D when being main user occupancy frequency spectrumsu=1 indicates, conclusive judgement after fusion is that primary user does not account for
D is used when with frequency spectrumsu=0 indicates.
Cognitive user to cognition relaying local detection consequential signal decision rule be：When cognition relaying detects primary user
Frequency spectrum is occupied, or detects and occurs when the cognition of the vacant frequency spectrum of primary user is relayed to cognitive user transmission local detection result
It interrupts, it is H that cognitive user, which is all adjudicated,is=1；The vacant frequency spectrum of primary user is detected when cognition relays, and is sent out to cognitive user
It is not interrupted when sending, cognitive user judgement is His=0.Above-mentioned decision rule is represented by
Wherein, Θis=1 indicates the thing interrupted when cognition relaying sends local detection consequential signal to cognitive user
Part, Θis=0 indicates that cognition relays the event that local detection consequential signal is successfully sent to cognitive user.According to Shannon's theorems, such as
Fruit channel capacity is more than the rate of information throughput, then information transmission is not interrupted, therefore, Θis=0 probability is expressed as,
Wherein,γr=Pr/N0, γp=Pp/N0, N0For the side of receiver Gaussian noise
Difference, | hrs|2The channel gain of cognitive user is relayed to for cognition, | hps|2For the channel gain of primary user to cognitive user, | hrs
|2With | hps|2Obeying mean value respectively isWithExponential distribution, and be mutually independent random variables,For in cognition
After the channel gain mean value to cognitive user,For the channel gain mean value of primary user to cognitive user；
Because only that when cognition relaying detects primary user's vacant frequency spectrum just transmission local detection as a result, so using
"AND" fusion rule is merged, as long as that is, there are one His=0, then Dsu=0, otherwise Dsu=1.Recognize after "AND" merges
The global detection probability and false-alarm probability for knowing user be respectively,
In summary cognitive user testing result is two kinds of situations of main user occupancy and vacant frequency spectrum, convolution
(1)-(4), the global detection probability and false-alarm probability that can obtain cognitive user are respectively
PdG=Pds(λ2)+(1-Pds(λ2))PdF (5)
PfG=Pfs(λ2)+(1-Pfs(λ2))PfF (6)
The process that cognitive user collects energy includes following two parts：First, occupying frequency spectrum, and cognitive user in primary user
When the fact that also detecting that, cognitive user is collected simultaneously the local detection knot sent from K cognition relaying in the report stage
The radio frequency energy of fruit signal energy and primary user's transmitter continues to collect from primary in information transmission stage cognitive user
The radio frequency energy of family transmitter；Second is that frequency spectrum is occupied in primary user, but the fact that cognitive user is not detected, and merge
When the fact that conclusive judgement is found after K1 local detection result and N-K1 default value, cognitive user transmits the stage in information
Collect the radio frequency energy for carrying out primary user transmitter.
To sum up, the gross energy that cognitive user is collected into report stage and transmission stage can be expressed as,
Wherein, EhFor the gross energy being collected into, η is energy conversion efficiency, 0 ＜ η ＜ 1, PdsIt is examined for the local of cognitive user
Survey probability, i.e. Pds(λ2)；
On the other hand, in a cycle that frequency spectrum perception and information are transmitted, the gross energy of consumption is expressed as cognitive user,
Ec=PDTτD+PFTτR[Pa(1-Pfs(λ2))+(1-Pa)(1-Pds(λ2))]
+PTT(1-τD-τR)[Pa(1-PfG(λ2))+(1-Pa)(1-PdG(λ2))]
Wherein, EcFor the gross energy of consumption, PDIndicate cognitive user in the power attenuation in detection primary user's stage, PFIt indicates
Power attenuation of the cognitive user in the signal that report stage cognition relaying is sent, PTIndicate that cognitive user transmits the stage in information
Power attenuation, PdG(λ2) be formula (5) cognitive user global detection probability, PfG(λ2) be formula (6) cognitive user it is complete
Office's false-alarm probability.
As it can be seen that ensure that the energy that cognitive user is collected into disclosure satisfy that it consumes the demand of energy, cognitive user is being reported
The gross energy E that announcement stage and transmission stage are collected intohIt is should be greater than to consume in a cycle that frequency spectrum perception and information are transmitted
Gross energy Ec。
According to above formula, the optimization that establishing makes global detection maximization and global false-alarm probability minimize is asked
Topic.Make global detection probability and the optimal related parameter values of false-alarm probability by that optimization problem solving, can obtain.
Numerical simulation is carried out below by required Optimal Parameters, to illustrate the technique effect of the present invention.Fig. 4 gives entirely
Office false-alarm probability thresholding and global detection probability between relation curve, it is seen then that no matter γsAnd γiHow is magnitude relationship, this hair
The bright high detection probability that can be obtained under low false-alarm probability (such as 0.01) more than 0.9.Meanwhile Fig. 5 shows no matter recognize
Number of variations or the variation of primary user's transmission power are relayed, the energy that cognitive user is collected into can meet always more than its consumption
The requirement of energy, and the energy being collected into can increase with the increase of primary user's transmission power.It can thus obtain, the present invention exists
While promoting frequency spectrum perception performance, cognitive user is made to obtain the enough energy that can ensure its normal work.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (7)
1. frequency spectrum perception and information transferring method with collection of energy in cognition wireless network, it is characterised in that：
In detection primary user's stage, whether cognitive user and the common detection primary user of N number of cognition relaying occupy frequency spectrum；
If cognitive user detects that primary user occupies frequency spectrum：In the report stage, cognitive user collects the radio frequency of primary user's transmitter
Signal energy collects the local detection consequential signal energy of K cognition repeat transmitted, wherein K cognition relaying detects primary
The vacant frequency spectrum in family, K≤N；It is transmitted the stage in information, cognitive user collects the radio frequency energy of primary user's transmitter；
If cognitive user detects the vacant frequency spectrum of primary user：In the report stage, cognitive user receives K and recognizes repeat transmitted
Local detection consequential signal, cognitive user by the K1 local detection result for receiving and being successfully decoded and N-K1 default value into
Row fusion, judges whether primary user occupies frequency spectrum according to fusion results, wherein K cognition relaying detects that primary user is vacant
Frequency spectrum, K≤N, K1≤K；If fusion results judgement is main user occupancy frequency spectrum, transmitted the stage in information, cognitive user is received
Collect the radio frequency energy of primary user's transmitter；If fusion results judgement is the vacant frequency spectrum of primary user, transmitted in information
Stage, cognitive user utilize the primary user's spectrum communication detected.
2. frequency spectrum perception and information transferring method with collection of energy in cognition wireless network according to claim 1,
It is characterized in that：Whether cognitive user and cognition relaying occupy frequency spectrum using the method detection primary user of energy measuring, that is, receive
The energy value of the radiofrequency signal of primary user's transmitter in a certain period of time, by it compared with preset energy threshold, according to than
Relatively result makes decisions, to obtain local detection result；Wherein, the preset energy threshold of cognitive user is more than cognition and relays
Preset energy threshold.
3. frequency spectrum perception and information transferring method with collection of energy in cognition wireless network according to claim 1,
It is characterized in that：The cognition relaying for detecting the vacant frequency spectrum of primary user, using the primary user's frequency spectrum detected, by local detection knot
Fruit signal is sent to cognitive user；The primary user's frequency spectrum being wherein detected is divided into N number of subchannel, and each cognition relaying occupies 1
Sub-channels；It recognizes the transmission power of relaying simultaneously and local detection probability needs to meet certain constraints.
4. frequency spectrum perception and information transferring method with collection of energy in cognition wireless network according to claim 1,
It is characterized in that：It detects that primary user occupies the cognition relaying of frequency spectrum, does not send testing result to cognitive user, but be transformed into not
Dormancy energy saver mode, until next frequency spectrum perception period arrives.
5. frequency spectrum perception and information transferring method with collection of energy in cognition wireless network according to claim 1,
It is characterized in that：The conclusive judgement method whether primary user occupies frequency spectrum is, if the local detection result of cognitive user is primary
Family occupies frequency spectrum, then the testing result is final judging result；It is not accounted for if cognitive user local detection result is primary user
With frequency spectrum, then cognitive user provides conclusive judgement as fusion center according to fusion results.
6. frequency spectrum perception and information transferring method with collection of energy in cognition wireless network according to claim 1,
It is characterized in that：The process that cognitive user collects energy includes following two parts：First, occupying frequency spectrum, and cognitive user in primary user
When the fact that also detecting that, cognitive user is collected simultaneously in the report stage from K local detection consequential signal energy and master
The radio frequency energy of user transmitter continues to collect the radio frequency for carrying out primary user transmitter in information transmission stage cognitive user
Signal energy；Second is that frequency spectrum is occupied in primary user, but the fact that cognitive user is not detected, and merge K1 local detection knot
When the fact that conclusive judgement is found after fruit and N-K1 default value, cognitive user is collected in the information transmission stage carrys out primary user
The radio frequency energy of transmitter.
7. frequency spectrum perception and information transferring method with collection of energy in cognition wireless network according to claim 6,
It is characterized in that：The gross energy that cognitive user is collected into is represented by：
Wherein, EhFor the gross energy being collected into, T is the period that frequency spectrum perception and information are transmitted, and η is energy conversion efficiency, 0 ＜ η ＜
1, PaFor the probability of the vacant frequency spectrum of primary user, PrFor the transmission power of cognition relaying, PpFor the transmitting work(of main user transmitter
Rate, ρiFor the suspend mode probability of i-th of cognition relaying, PdsFor the local detection probability of cognitive user, | hrs|2It is relayed to and recognizes for cognition
Know the channel gain of user, | hps|2For the channel gain of primary user to cognitive user, PdFFor the overall situation at cognitive user after fusion
Detection probability, τDAnd τRRespectively detect the expense in primary user's stage and report stage, 0 ＜ τD1,0 ＜ τ of ＜R＜ 1.
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| CN110602758A (en) * | 2019-08-22 | 2019-12-20 | 浙江工业大学 | Cognitive energy-carrying relay communication method based on multi-slot wireless energy collection |
| CN111556547A (en) * | 2020-04-20 | 2020-08-18 | 河海大学常州校区 | Cognitive user energy collection and information transmission method based on wireless radio frequency energy supply |
| CN114302365A (en) * | 2021-06-16 | 2022-04-08 | 河北大学 | Primary and secondary user cooperative spectrum sensing method for V2V communication network |
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