CN107592171A - A kind of single channel efficiency frequency spectrum sensing method based on perceptual performance - Google Patents
A kind of single channel efficiency frequency spectrum sensing method based on perceptual performance Download PDFInfo
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- CN107592171A CN107592171A CN201610541872.8A CN201610541872A CN107592171A CN 107592171 A CN107592171 A CN 107592171A CN 201610541872 A CN201610541872 A CN 201610541872A CN 107592171 A CN107592171 A CN 107592171A
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Abstract
The present invention relates to a kind of single channel efficiency frequency spectrum sensing method based on perceptual performance.First, establish cognitive radio frequency spectrum and perceive dualism hypothesis model；Then, the relation that cognitive radio users transmit perception total energy consumption and detecting period needed for a packet is derived；Finally, using required perceptual performance (target detection probability, target false-alarm probability) as constraints, the minimum perception energy consumption needed for one packet of transmission is calculated.The present invention from the angle for meeting perceptual performance requirement give single channel under the conditions of most short detecting period and its minimum perceive energy consumption.
Description
One technical field
The present invention relates to a kind of cognitive radio frequency spectrum cognition technology, particularly a kind of single channel energy based on perceptual performance
Imitate frequency spectrum sensing method.
Two background technologies
Frequency spectrum perception is one of key technology in cognitive radio, and its target is accurately and rapidly to detect spectrum interposition,
So as to efficiently provide basis using frequency spectrum on the premise of primary user is not disturbed for time user.Generally, the performance of frequency spectrum perception by
Detection probability and false-alarm probability represent.Detection probability is higher, and primary user can more be better protected.False-alarm probability is lower, one
The chance that channel is used by secondary user is more.In addition, pursuing today of green communications, cognitive radio is also required to consider energy
Consumption problem.Wherein, the energy consumption of frequency spectrum perception is the important component of cognition wireless electric energy consumption.At present, has document by energy consumption
Problem is introduced in the research of frequency spectrum perception, such as obtains channel-aware order by perceiving roughly, then selected channel is carried out
It is fine to perceive, so as to reduce total perception energy consumption；Or determine to perceive in next step according to previous sensing results and take action, so as to reduce
Perceive expense.But existing algorithm is to reduce perception energy consumption by certain perceptual strategy mostly, without in view of perceptual performance
It is required that such as influence of detection probability, the false-alarm probability requirement to perception energy consumption.
Three content of the invention
Therefore, process provides a kind of single channel efficiency frequency spectrum sensing method based on perceptual performance, it is therefore an objective to meets
Under the premise of perceptual performance requirement, the frequency spectrum perception of least energy consumption is realized.
Realize the technical scheme is that：A kind of single channel efficiency frequency spectrum sensing method based on perceptual performance, it is walked
Suddenly it is：The first step, establish cognitive radio frequency spectrum and perceive dualism hypothesis model.Second step, derive cognitive radio users transmission
The relation for perceiving total energy consumption and detecting period needed for one packet.3rd step, by required perceptual performance (target detection
Probability, target false-alarm probability) constraints is used as, calculate the minimum perception energy consumption needed for one packet of transmission.
It is of the invention compared with existing efficiency frequency spectrum sensing method, its remarkable advantage is：Give and examine under the conditions of single channel
Consider minimum perception energy consumption during perceptual performance requirement.
Four brief description of the drawings
Accompanying drawing is a kind of flow chart of the single channel efficiency frequency spectrum sensing method based on perceptual performance of the present invention, is also simultaneously
The Figure of abstract of this patent.
Five embodiments
The single channel efficiency frequency spectrum sensing method based on perceptual performance is further described below in conjunction with the accompanying drawings.Do first
Go out hypothesis below：
1st, a primary user (PU) and one user (SU) in environment be present, and they share same channel.
2nd, primary user has the priority that frequency spectrum accesses, and secondary user is cognitive radio users, using energy measuring method pair
Frequency spectrum is perceived, can channel perception whether taken by primary user.
3rd, secondary user periodically perceives to channel, is carried out data transmission if channel idle using channel, each
Detecting period is τ in cycles, data transmission period T.
Embodiment is：
1st, establish cognitive radio frequency spectrum and perceive dualism hypothesis model.
Whether taken according to channel by primary user, channel has two states, i.e. idle condition and busy condition, therefore perceives and ask
Topic is represented by following dualism hypothesises：
H in formula0Represent channel idle；H1Represent that channel is taken by primary user；W (n) represents that independent identically distributed zero-mean adds
Property white Gaussian noise, its variance areH (n) represents channel gain；S (n) represents primary user's signal.
2nd, the relation that time user transmits perception energy consumption and detecting period needed for a packet is derived.
According to energy measuring correlation theory, secondary user is represented by the detection probability of primary user：
Q () is CCDF (Q functions) in formula, fsFor sampling rate, λ is detection threshold, and γ is time use
Family receives signal to noise ratio during primary user's signal, PftFor required false-alarm probability.False-alarm probability of the secondary user to primary user detection
It is represented by：
P in formuladtFor required detection probability.Therefore, present channel is perceived as busy probability PbRepresent as follows：
Pb(τs)=(1- ρ) Pf(τs)+ρPd(τs) (4)
ρ is the probability of primary user's busy channel in formula.Transmission probability P of the secondary user in the channeltIt is represented by：
Pt=1-Pb(τs) (5)
Average time when secondary user completes required for the transmission of a length of S packet is Ts=S/Pt, then a number is completed
The perception number needed according to bag transmission is as follows：
In formulaFor the computing that rounds up, T is that time user each perceives the time for being used to transmit in the cycle.Therefore can obtain
Transmission one packet perception total energy consumption be：
J(τs)=N (τs)τsEs (7)
E in formulasFor the perception energy consumption of secondary Subscriber Unit time.
3rd, calculate the minimum that time user is transmitted needed for a packet and perceive energy consumption.
On the premise of detection probability and false-alarm probability requirement is met, secondary user transmits the minimum sense needed for a packet
Know that energy consumption is represented by following optimization problem：
J (τ in formulas) it is to complete the perception energy consumption needed for a packet transmission, Pd(τs)、Pf(τs) it is respectively detecting period
τsUnder detection probability and false-alarm probability, Pdt、PftRespectively required detection probability and false-alarm probability.
According to the constraints of optimization problem, as sample frequency fsWhen fixed, the perception for meeting formula (8) constraints is solved
Time.Formula (2) and formula (3) are substituted into inequality P respectivelyd(τs)≥PdtAnd Pf(τs)≤Pft, it is available：
γ is signal to noise ratio when time user receives primary user's signal in formula.
Due in energy measuring, growing up to positive correlation when perceiving energy consumption with perceiving, perception duration is shorter, perceives energy consumption
It is smaller.Therefore be to make the perception total energy consumption of one packet of transmission minimum, in the case of constraints is met, the detecting period should be taken to be
Minimum value in formula (9)：
The minimum detecting period that formula (10) is represented is substituted into formula (7), obtains transmitting the minimum sense needed for a packet
Know energy consumption：
Therefore, the detecting period that secondary user provides according to formula (10) is perceived, and will meet required detection probability
Under the premise of false-alarm probability, minimum perception energy consumption is obtained.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God any modification, equivalent substitution and improvements done etc., should be included within the scope of protection of the invention with principle.
The content not being described in detail in the present patent application book belongs to prior art known to professional and technical personnel in the field.
Claims (1)
1. a kind of single channel efficiency frequency spectrum sensing method based on perceptual performance, its step are：First, establish cognitive radio frequency
Spectrum perceives dualism hypothesis model；Second, derive cognitive radio users and transmit the perception total energy consumption needed for a packet and feel
Know the relation of time；3rd, using required perceptual performance (target detection probability, target false-alarm probability) as constraints,
Calculate the minimum perception energy consumption needed for one packet of transmission.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120108276A1 (en) * | 2010-10-27 | 2012-05-03 | The Hong Kong University Of Science And Technology | Cooperative spectrum sensing in cognitive radio networks |
| CN103929255A (en) * | 2014-04-17 | 2014-07-16 | 电子科技大学 | Cognitive user energy efficiency optimization method based on multiple channels |
| CN105515698A (en) * | 2015-11-25 | 2016-04-20 | 宁波大学 | Dynamic-adjusting-based multi-frequency-range cooperated frequency spectrum sensing method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120108276A1 (en) * | 2010-10-27 | 2012-05-03 | The Hong Kong University Of Science And Technology | Cooperative spectrum sensing in cognitive radio networks |
| CN103929255A (en) * | 2014-04-17 | 2014-07-16 | 电子科技大学 | Cognitive user energy efficiency optimization method based on multiple channels |
| CN105515698A (en) * | 2015-11-25 | 2016-04-20 | 宁波大学 | Dynamic-adjusting-based multi-frequency-range cooperated frequency spectrum sensing method |
Non-Patent Citations (1)
| Title |
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| 胡庆等: "基于节点选择的能量高效的协作频谱感知算法", 《电视技术》 * |
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