CN108880640A - The adaptive tracking control method of wireless energy supply communication system - Google Patents
The adaptive tracking control method of wireless energy supply communication system Download PDFInfo
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- CN108880640A CN108880640A CN201810615180.2A CN201810615180A CN108880640A CN 108880640 A CN108880640 A CN 108880640A CN 201810615180 A CN201810615180 A CN 201810615180A CN 108880640 A CN108880640 A CN 108880640A
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- Prior art keywords
- energy
- access point
- antenna
- data
- power
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0426—Power distribution
- H04B7/043—Power distribution using best eigenmode, e.g. beam forming or beam steering
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/20—Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
Abstract
The invention discloses a kind of adaptive tracking control methods of wireless energy supply communication system, including：Initial Channel Assignment status information and time slot allocation τ T；Energy access point carries out wave beam forming using high specific transmission technology, it is rear to data access point send energy beam；Data access point receives the energy beam of energy access point and is translated into total transmission power, then according to the power limit of antenna and total number of antennas l for sending power and determining transmission antenna subset, reselection data channel l root transmission antenna in the best state carries out constant power distribution as transmission antenna subset and to it, and the data of needs are finally issued wireless device using high specific transmission technology.This method, there are self-adjusted block in the case where power limit, realized to the collection energy with randomness, improves the reliability of the utilization efficiency and communication system of collecting energy in antenna.
Description
Technical field
The present invention relates to wireless energy supply communication system and power distributing technique fields more particularly to a kind of wireless energy supply to communicate
The adaptive tracking control method of system.
Background technique
WPT (Wireless Power Transfer, wireless power transfer) technology is one using electromagnetic wave as energy
Carrier without electrical contact carries out the novel power transmission method of electric energy transmission from power supply to load.Compared to conventional wires transmission of electricity side
Formula has many advantages, such as safety, reliability, convenience, is particularly suitable for some special applications, such as be implanted into
The equipment of human body, the equipment in high-risk region and outdoor large-scale sensor.Because of above plurality of advantages, unlimited power is passed
Transferring technology receives more and more extensive concern and will be widely applied in practice.
WPCN (Wireless Powered Communication Networks, wireless energy supply communication network) is a kind of
The communication network persistently energized using WPT technology for mass communication node, it includes EAP (Energy Access Point,
Energy access point), DAP (Data Access Point, data access point) and WD (Wireless Device, wireless device),
Wherein WD is collected energy from the energy beam of EAP and is communicated using the energy being collected into DAP.Compared to traditional communication net
Network, WPCN have many advantages, such as longer communication life cycle and more stable communication performance.
With the rise of 5G and the high speed development of Internet of Things, more and more sensors access networks, formed on a large scale by
WPT technology provides energy and using sensor as the WPCN of capital equipment.However, the communication equipment in WPCN in the general sense
Other than EAP, do not have the electric energy storage devices such as cable energy supply and battery, be completely dependent on WPT technology and real-time energy is provided,
And the electric energy that WPT can be provided will receive the influence of the radio channel state of transmission energy, have randomness.Further, since
There is the limitation for sending power in antenna, the reception energy more than limitation can only be rejected, this causes power service efficiency low and logical
Believe that performance is poor.In order to collect electric energy have randomness and antenna there are improved in the case where power limit power service efficiency and
Communication performance, there is an urgent need to a kind of efficient power distribution methods by WPCN.
Summary of the invention
The object of the present invention is to provide a kind of adaptive tracking control methods of wireless energy supply communication system, and receipts can be improved
Collect the utilization efficiency of energy and reaches preferable communication performance.
The purpose of the present invention is what is be achieved through the following technical solutions：
A kind of adaptive tracking control method of wireless energy supply communication system, including：
Initial Channel Assignment status information and time slot allocation τ T；
Energy access point carries out wave beam forming using high specific transmission technology, it is rear to data access point send energy wave
Beam；
Data access point receives the energy beam of energy access point and is translated into total transmission power, then according to antenna
Power limit and total number of antennas l for sending power and determining transmission antenna subset, reselection data channel l root in the best state
Transmission antenna carries out constant power distribution as transmission antenna subset and to it, finally utilizes high specific transmission technology by the number of needs
According to issuing wireless device.
It as seen from the above technical solution provided by the invention, can there are randomness and antennas to exist collecting electric energy
In the case where power limit, suitable transmission antenna is selected according to power limit, collection electric energy and data channel state
Collect and adaptively carries out power distribution；Above scheme can more substantially effectively utilize the collection energy with randomness, and
And the outage probability of system can be reduced, improve the reliability of communication.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Attached drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill in field, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is wireless energy supply communication system architecture schematic diagram provided in an embodiment of the present invention；
Fig. 2 is the flow chart of the adaptive tracking control method of wireless energy supply communication system provided in an embodiment of the present invention；
Fig. 3 is the emulation and reason of the system provided in an embodiment of the present invention in the case where energy transmission channel is Rayleigh fading
By approximate outage probability comparison diagram；
Fig. 4 be it is provided in an embodiment of the present invention in the case where energy transmission channel is Rayleigh fading when EAP have difference
The outage probability figure of transmission antenna number；
Fig. 5 be it is provided in an embodiment of the present invention in the case where energy transmission channel is Rayleigh fading when DAP have difference
The outage probability figure of transmission antenna number；
Fig. 6 be it is provided in an embodiment of the present invention energy transmission channel be have different Rice factors Lay this decline feelings
Outage probability figure under condition.
Specific embodiment
With reference to the attached drawing in the embodiment of the present invention, technical solution in the embodiment of the present invention carries out clear, complete
Ground description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on this
The embodiment of invention, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, belongs to protection scope of the present invention.
The embodiment of the present invention provides a kind of adaptive tracking control method of wireless energy supply communication system, wireless energy supply communication
System is structure as shown in Figure 1, it mainly includes the node of energy access point, data access point and wireless device three types；
Wherein, the antenna that there is energy access point N root to send energy, the antenna and M root hair that there is data access point a piece-root grafting to receive energy
Send the antenna of data, the antenna that there is wireless device a piece-root grafting to receive data.
In complete communication process, in initial period τ T, data access point (DAP) is from energy access point (EAP)
Energy is collected in the energy beam of transmission and converts thereof into transmission power, in period (1- τ) T later, data access
Point (DAP) distribution sends power to each antenna to communicate with wireless device (WD).
As shown in Fig. 2, a kind of flow chart of the adaptive tracking control method of wireless energy supply communication system, is mainly wrapped
It includes：
1, Initial Channel Assignment status information and time slot allocation τ T；Wherein, shared system is spaced between when τ is transmission energy
(primary realize) total time interval ratio (being greater than 0 less than 1), T is the total time interval of system (primary to realize).
2, energy access point carries out wave beam forming using high specific transmission technology (MRT), backward data access point hair
Send energy beam.
3, data access point receives the energy beam of energy access point and is translated into total transmission power, then according to day
The power limit of line and total number of antennas l, reselection data channel l in the best state for sending power and determining transmission antenna subset
Root transmission antenna carries out constant power distribution as transmission antenna subset and to it, finally utilizes high specific transmission technology by needs
Data issue wireless device.
This step main process is as follows：
1) the received ENERGY E of data access point is calculatedr：
Er=τ T | | h | |2pe；
In above formula, peThe power of energy is sent for energy access point, h is energy transmission channel vector, energy beam figuration
Vector is b=h*/ | | h | |, * is conjugate transposition symbol；
2) by received ENERGY ErThe total transmission power p being converted in period (1- τ) Ttotal：
In above formula, η is energy conversion efficiency.
3) according to the power limit of antenna and total number of antennas l for sending power and determining transmission antenna subset, formula is：
In above formula, M is in data access point for sending the antenna sum of data, pmaxFor the upper limit of the power of each antenna,
MpmaxNamely the general power upper limit of data is sent using all antennas.
4) constant power distributes, and formula is：
In above formula, ptThe power distributed by each antenna, pmaxFor the upper limit of the power of each antenna.
4, wireless device receives the data of data access point output.
Assuming that the data-signal that each antenna in data sending point is sent is x, the power that each antenna sends data is equal to it
The power of distribution, i.e., | x |2=pt；Data channel vector is g, and wave beam forming vector is q=g*/ | | g | |, wireless device receiving end
Noise n be Cyclic Symmetry multiple Gauss variable n~CN (0, σ2)；Wherein, (0, σ CN2) indicate the distribution of Cyclic Symmetry multiple Gauss,
Mean value is 0, variance σ2；
The data-signal that then wireless device receives is：
The signal-to-noise ratio received is：
Above scheme of the embodiment of the present invention can collect electric energy there are randomness and antenna there are power limits the case where
Under, according to power limit, collect electric energy and data channel state select suitable transmission antenna subset and adaptively into
Row power distribution；Above scheme can be more substantially effectively using the collection energy with randomness, and can reduce system
Outage probability, improve the reliability of communication.
In order to illustrate above-mentioned beneficial effect of the invention, said below with reference to Fig. 3~performance simulation shown in fig. 6 figure
It is bright.
Simulation parameter：EAP, DPA, WD three classes node each one, the antenna number that EAP sends energy is N=5, and DAP receives
The antenna number of energy is 1, and the antenna number for sending data is M=5, and the antenna number that WD receives data is 1, energy transmission letter
Road is Rayleigh fading and in Fig. 6 is this decline of Lay in Fig. 3, Fig. 4, Fig. 5, and data transmission channel is always Rayleigh fading, quilt
The antenna number for the transmitting antenna subset chosen is 1≤l≤M, and SNR threshold value is γthThe SNR of the receiving end=20dB, WD is lower than this
Then system will be considered at interrupt status to threshold value.
Abscissa is signal-to-noise ratio in Fig. 3, and unit is dB, and ordinate is outage probability, is set forth l=1 in figure, 2,4
When simulated interrupt probability and corresponding diversity gain series, outage probability is smaller to show that system break performance is better.From figure
It can be found that the slope in high s/n ratio region outage probability is parallel to each other, this also demonstrates point using system of the invention
Diversity gain series is determined by the smaller side of transmitting antenna number in EAP and DAP.Meanwhile this is also indicated that using of the invention
The diversity gain series of adaptive tracking control method, system is improved, and communication performance is improved.
Abscissa is signal-to-noise ratio in Fig. 4, and unit is dB, and ordinate is outage probability, and N is set forth in figure from 1 to 10
Simulated interrupt probability.From figure it can be found that with N increase, outage probability is smaller and smaller, and diversity gain series is in N
When less than 5, be the increase with N and increase, but after N is greater than 5, diversity gain series no longer with the increase of N and
Increase, this diversity gain series for also demonstrating system is determined by the smaller side of transmitting antenna number in EAP and DAP.Together
When, this also indicates that, using adaptive tracking control method of the invention, the diversity gain series of system is improved, communicativeness
It can be improved.
Abscissa is signal-to-noise ratio in Fig. 5, and unit is dB, and ordinate is outage probability, and M is set forth in figure from 1 to 10
Simulated interrupt probability.From figure it can be found that with M increase, interruption performance is become better and better, and diversity gain series is in M
When less than 5, be the increase with M and increase, but after M is greater than 5, diversity gain series no longer with the increase of M and
Increase, this diversity gain series for also demonstrating system is determined by the smaller side of transmitting antenna number in EAP and DAP.Together
When, this also indicates that, using adaptive tracking control method of the invention, the diversity gain series of system is improved, communicativeness
It can be improved.
Abscissa is signal-to-noise ratio in Fig. 6, and unit is dB, and ordinate is outage probability, is given in figure when energy transmission is believed
Road is outage probability when having this decline of the Lay of different Rice factor K, wherein Rice factor K=0,1,2,4,8,16,32,
64.Rayleigh channel therein namely K=0.From figure it can be found that with K increase, interruption performance becomes better and better, this explanation
DAP can obtain more energy from LOS (Line-of-Sight, look at straight diameter) component, and diversity gain series be still by
What the smaller side of transmitting antenna number in EAP and DAP determined.Meanwhile this is also indicated that even if in energy transmission channel, for Lay, this declines
In the environment fallen, using adaptive tracking control method of the invention, the diversity gain series of system can be also improved, communication
Performance can also be improved.
By above-mentioned simulation result as it can be seen that the present invention is random to having there are realizing in the case where power limit in antenna
Property collection energy self-adjusted block, improve collect energy utilization efficiency and communication system reliability.
Through the above description of the embodiments, those skilled in the art can be understood that above-described embodiment can
The mode of necessary general hardware platform can also be added to realize by software by software realization.Based on this understanding,
The technical solution of above-described embodiment can be embodied in the form of software products, which can store non-easy at one
In the property lost storage medium (can be CD-ROM, USB flash disk, mobile hard disk etc.), including some instructions are with so that a computer is set
Standby (can be personal computer, server or the network equipment etc.) executes method described in each embodiment of the present invention.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Within the technical scope of the present disclosure, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claims
Subject to enclosing.
Claims (6)
1. a kind of adaptive tracking control method of wireless energy supply communication system, which is characterized in that including：
Initial Channel Assignment status information and time slot allocation τ T；
Energy access point carries out wave beam forming using high specific transmission technology, it is rear to data access point send energy beam；
Data access point receives the energy beam of energy access point and is translated into total transmission power, then according to the function of antenna
Rate limitation and total number of antennas l for sending power and determining transmission antenna subset, reselection data channel l root in the best state are sent
Antenna carries out constant power distribution as transmission antenna subset and to it, is finally sent out the data of needs using high specific transmission technology
To wireless device.
2. a kind of adaptive tracking control method of wireless energy supply communication system according to claim 1, which is characterized in that
Wireless energy supply communication system includes the node of energy access point, data access point and wireless device three types；Wherein, energy connects
There is a piece-root grafting to receive the antenna of energy and the day of M root transmission data for the antenna that there is access point N root to send energy, data access point
Line, the antenna that there is wireless device a piece-root grafting to receive data.
3. a kind of adaptive tracking control method of wireless energy supply communication system according to claim 1, which is characterized in that
The data access point receives the energy beam of energy access point and is translated into total power that sends：
Firstly, calculating the received ENERGY E of data access pointr：
Er=τ T | | h | |2pe；
In above formula, peThe power of energy is sent for energy access point, h is energy transmission channel vector, and energy beam forming vectors are
B=h*/ | | h | |, * is conjugate transposition symbol；
Then, by received ENERGY ErThe total transmission power p being converted in period (1- τ) Ttotal：
In above formula, η is energy conversion efficiency.
4. a kind of adaptive tracking control method of wireless energy supply communication system according to claim 3, which is characterized in that
The power limit according to antenna and total transmission power determine that the formula of the number of antennas l of transmission antenna subset is：
In above formula, M is in data access point for sending the antenna sum of data, pmaxFor the upper limit of the power of each antenna.
5. a kind of adaptive tracking control method of wireless energy supply communication system according to claim 3 or 4, feature exist
In the formula of constant power distribution is：
In above formula, ptThe power distributed by each antenna, pmaxFor the upper limit of the power of each antenna.
6. a kind of adaptive tracking control method of wireless energy supply communication system according to claim 3 or 4, feature exist
In when the data of needs are issued wireless device using high specific transmission technology by data access point, it is assumed that data access point is each
The data-signal that antenna is sent is x, and data channel vector is g, and wave beam forming vector is q=g*/ | | g | |, wireless device receives
The noise n at end is Cyclic Symmetry multiple Gauss variable n~CN (0, σ2)；Wherein, (0, σ CN2) indicate the distribution of Cyclic Symmetry multiple Gauss,
Its mean value is 0, variance σ2；
The data-signal that then wireless device receives is：
The signal-to-noise ratio received is：
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113423081A (en) * | 2021-06-18 | 2021-09-21 | 深圳大学 | Wireless energy transmission method and device, computer equipment and storage medium |
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Application publication date: 20181123 |