CN108848558A - A kind of SWIPT system self-adaption time slot signal method of reseptance collected based on nonlinear energy - Google Patents
A kind of SWIPT system self-adaption time slot signal method of reseptance collected based on nonlinear energy Download PDFInfo
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Abstract
The invention discloses a kind of SWIPT system self-adaption time slot signal method of reseptances collected based on nonlinear energy, first, for nonlinear energy SWIPT system in the scene of flat fading channel point-to-point communication, solve the problems, such as that input signal power saturation causes to receive energy dissipation SWIPT mission nonlinear energy receiver in some time slot and receiving end is rough to resource allocation；Secondly, being directed to nonlinear energy SWIPT system, proposes adaptively to be switched according to channel status and collect information or energy.Intelligence receiver and energy receiver handoff factor are optimized, the objective function form of construction is simple, and partial parameters can be adjusted according to the different demands in different scenes, improve the flexibility of application；The solution of objective function is acquired by optimization algorithm, and process is simple, not complicated mathematical analysis process, is easy to practical operation, and two important indicators of outage probability of the energy to receiving end acquisition and system can optimize simultaneously.
Description
Technical field
The present invention relates to wireless communication technology fields, and in particular to it is a kind of based on nonlinear energy collect wireless messages with
Energy cooperative transmission (SWIPT) system self-adaption adapts to time slot signal method of reseptance.
Background technique
In the wireless network of some traditional energy constraints, the battery that the service life of network is often depending on network node holds
Amount, therefore the node energy content of battery is sustainable extremely important, it usually needs periodically charge the battery or replace electricity
Pond.The energy constraint network severe for working environment, the battery charging or replacement of node are difficult, even cannot achieve, and open
Sending out wireless energy transfer/collection technique becomes urgent need.
SWIPT is the technology that wireless information transfer is combined with wireless energy transfer, and receiving end is by intelligence receiver and energy
Receiver composition is measured, allows receiver under the premise of not increasing additional time and frequency resource, to same radio frequency
Signal carries out therefrom obtaining energy (EH) while information decoding (ID).It is depended on traditional wind energy, solar energy, tide energy etc.
The natural environments such as weather thus compare by uncontrollable energy collection technology, and SWIPT can provide stable, controllable, reliable energy and receive
Collection becomes industry research and focus of attention in recent years.In SWIPT system, energy acceptance and the information decoding of receiving end are utilized
Identical reception signal, how reasonable distribution system resource is to influence the critical issue of system performance.
There are many researched and proposed the various methods about SWIPT system resource allocation, but existing method master at present
Want linear energy receiver.Publication No. CN105611633A, publication date are the patent of invention " base on May 25th, 2016
In the receiver resources distribution method of the beam form-endowing method of SWIPT ", it provides a kind of by wave beam forming design and SWIPT system
System resource allocation combines the method to reduce base-station transmitting-power, but the invention linear energy receiver and with base
Standing and sending minimum power is target.Publication No. CN105119644A, publication date are the patent of invention " base on December 2nd, 2015
In the Single User MIMO system space division switching method of SWIPT " it provides using MIMO space division handoff technique to SWIPT system in energy
Amount receives the method switched between information decoding both of which, but the invention is equally directed to linear energy reception
Machine does not account for the non-linear of energy receiver.
Actual SWIPT energy receiver has the characteristics that nonlinear：When the power for receiving signal increases to certain value
When, the output power of energy receiver is up to saturation, remains unchanged.The resource allocation methods of existing SWIPT system, can not
Solve reception energy waste problem when energy receiver output power saturation.
Summary of the invention
The purpose of the present invention is to solve drawbacks described above in the prior art, provide a kind of based on nonlinear energy collection
SWIPT system self-adaption time slot signal method of reseptance.This method uses a kind of collection of energy mould based on time slot switching architecture
Formula optimizes intelligence receiver and energy receiver handoff factor, it is intended to be using minimizing outage probability as optimization aim
SWIPT system provides one kind and meets actual resource allocation methods.
The purpose of the present invention can be reached by adopting the following technical scheme that：
A kind of SWIPT system self-adaption time slot signal method of reseptance collected based on nonlinear energy, the recipient
Method includes the following steps：
S1, transmitting terminal S send signal x to the receiving node D of energy constraint, and a resource block is divided into K by receiving node D
Sub-slots are received, and the signal that k-th of time slot receives is：In formula, 1≤k≤K, hkIndicate kth
The channel coefficients of a time slot obey flat fading, PkIndicate the transmission signal power of the time slot, n is receiving end additive Gaussian white noise
Sound；
S2, handoff factor ρ between the intelligence receiver and energy receiver of receiving node D is defined, in k-th of time slot,
Handoff factor between the intelligence receiver and energy receiver of receiving node D is defined as ρ (k), optimal to cut in k-th of time slot
The optimal value for changing the i.e. ρ (k) of coefficient is denoted as ρ*(k), receiving node D is according to ρ*(k) value carries out information reception or energy is received
Collection；
S3, according to the reception signal yrk, calculate its performance number Prk=| hk|2Pk, wherein | hk|2It is complex channel coefficient
hkMould, indicate k-th of time slot channel power gain；
S4, according to receive signal performance number Prk, calculate input work of the energy receiver in k-th of time slot of destination node
Rate
S5, by energy receiver input powerMultiplied byηAfterwards with the output power saturation value of energy receiverIt carries out
Compare, whereinηIt is the energy conversion efficiency of destination node energy receiver, ifThen ρ*(k)=1, receiving node
D switches a signal into intelligence receiver, which only carries out information reception；Otherwise, following sequential steps are executed；
S6, optimization aim is minimised as with system break probability, handoff factor ρ (k) is optimization object, objective functionWhereinIt is the momentary interruption probability of k-th of time slot of system, is the function of ρ (k)；
S7, using method of Lagrange multipliers, and combine binary search method, to the objective functionInto
Row solves, and obtains optimal intelligence receiver and energy receiver handoff factor ρ*(k)；
The each sub-slots intelligence receiver and energy receiver handoff factor ρ that S8, basis obtain*(k) value carries out certainly
Time slot signal is adapted to receive.
Further, the value of the handoff factor ρ (k) is 0 or 1, and wherein ρ (k)=1 indicates that the time slot receiving end will
Signal is received for information, and ρ (k)=0 indicates that signal is used for energy and connects collection by the time slot receiving end.
Further, the formula of the outage probability is as follows：Wherein rk=ρ (k) log
(1+γk) be k-th of time slot of system instant message reception rate, r0It is the minimal information receiving velocity door of system normal communication
Limit value, hereinSignal-to-noise ratio for receiving end in k-th of time slot, σ2It is the noise power of receiving end.
Further, intelligence receiver optimal in the step S7 and energy receiver handoff factor ρ*(k) value
It is as follows：
(1) whenWhen, then ρ*(k)=0；
(2) whenWhen, then ρ*(k)=1；
(3) whenWhen, then ρ*(k)=0；
Wherein λ*It is best Lagrange multiplier.
Further, the energy conversion efficiency η value of the destination node energy receiver is 1.
Further, self-adapting time slot letter signal receives in the step S8, refers to ρ*(k)=1 when, the sub-slots are only
Carry out information reception, ρ*(k)=0 when, which only carries out collection of energy.
Further, the method for reseptance is directed to SWIPT system in point-to-point wireless communication scene, channel class
Type is flat fading channel, and sending node S has a fixed and lasting energy supply, receiving node D energy constraint and without solid
The receiver of fixed energy supply, receiving node D consists of two parts：Intelligence receiver and energy receiver, energy receiver
Energy is obtained from the radiofrequency signal of ambient enviroment.
The present invention has the following advantages and effects with respect to the prior art：
1, the present invention is solved for nonlinear energy SWIPT system in the scene of flat fading channel point-to-point communication
SWIPT mission nonlinear energy receiver input signal power saturation in some time slot leads to the problem of receiving energy dissipation.
2, the present invention considers to be more in line with actual needs, solves nonlinear energy SWIPT system receiving terminal to resource allocation
Rough problem, makes that signal is used for information by nonlinear energy SWIPT system or the collection of energy method of salary distribution is more fine, improves
The working efficiency of nonlinear energy SWIPT system receiver.
3, the present invention is directed to nonlinear energy SWIPT system, proposes adaptively to be switched according to channel status and collects information
Or energy.Intelligence receiver and energy receiver handoff factor are optimized, the objective function form of construction is simple, and portion
Point parameter can be adjusted according to the different demands in different scenes, improve the flexibility of application；The Xie Youyou of objective function
Change algorithm to acquire, process is simple, not complicated mathematical analysis process, is easy to practical operation, and can simultaneously obtain receiving end
Two important indicators of the energy taken and the outage probability of system optimize.
Detailed description of the invention
Fig. 1 is that nonlinear energy of the invention collects SWIPT system self-adaption time slot reception flow chart；
Fig. 2 is the supplementary flow chart of Fig. 1；
The information or energy receiver schematic diagram that Fig. 3, which is SWIPT system of the present invention, to be switched based on time slot；
Fig. 4 is SWIPT mission nonlinear energy receiver collection of energy illustraton of model of the present invention；
Fig. 5 is the collection schematic diagram of received signal power of the present invention Yu nonlinear energy relationship.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Embodiment
The present embodiment discloses a kind of SWIPT system self-adaption time slot signal method of reseptance collected based on nonlinear energy,
Specific implementation process mainly has：Intelligence receiver and energy receiver handoff factor are optimized, carried out according to optimum results
Self-adapting time slot receives signal.
In this embodiment, SWIPT system self-adaption time slot is collected for nonlinear energy as depicted in figs. 1 and 2 receive core
The process of heart step, the information or energy receiver that SWIPT system of the present invention shown in Fig. 3 is switched based on time slot, Fig. 4
Shown in SWIPT mission nonlinear energy receiver collection of energy model of the present invention, it is shown in fig. 5 of the present invention
The collection schematic diagram of received signal power and nonlinear energy relationship.
Steps are as follows for the realization of the present embodiment：
Step S1, transmitting terminal S sends signal x to the receiving node D of energy constraint, and receiving node D divides a resource block
It is received at K sub-slots, the signal that kth (1≤k≤K) a time slot receives is：H in formulakIndicate that the channel coefficients of k-th of time slot obey flat fading, PkIndicating should
The transmission signal power of time slot, n are receiving end additive white Gaussian noise.
In the present embodiment, the delivery time of a resource block is 60s, and a resource block is divided into K=60 time slot and is carried out
It receives, kth (1≤k≤60) sub-slots send the power P of signalk=5mw.
Step S2, the handoff factor ρ between the intelligence receiver and energy receiver of receiving node D is defined.At k-th
Gap, the handoff factor between the intelligence receiver and energy receiver of receiving node D are defined as ρ (k).It is optimal to cut in kth time slot
The optimal value for changing the i.e. ρ (k) of coefficient is denoted as ρ*(k), receiving node D is according to ρ*(k) value carries out information reception or energy is received
Collection.The possibility value of handoff factor ρ (k) only has 0 and 1, and wherein ρ (k)=1 indicates that signal is used for information and connect by the time slot receiving end
It receives, ρ (k)=0 indicates that signal is used for energy and connects collection by the time slot receiving end.
Step S3, the reception signal y according to step S1rk, calculate its performance number Prk=| hk|2Pk, wherein | hk|2It is
Complex channel coefficient h described in step S1kMould, indicate k-th of time slot channel power gain.
Step S4, the performance number P of signal is received according to step S3rk, the energy receiver for calculating destination node exists
The input power of k-th of time slot
Step S5, by energy receiver input power described in step S4Multiplied by the output work after η with energy receiver
Rate saturation valueIt is compared, ifThen ρ*(k)=1, receiving node D switches a signal into intelligence receiver,
The time slot only carries out information reception；Otherwise, following sequential steps are executed.The η is the energy of destination node energy receiver
Transfer efficiency, the present invention in η=1, the output power saturation value of energy receiver
Step S6, optimization aim is minimised as with system break probability, handoff factor ρ (k) is optimization object, defines target
FunctionWhereinIt is the momentary interruption probability of k-th of time slot of system, is ρ (k)
Function.In embodiment, outage probability is by formulaIt provides.Wherein rk=ρ (k) log (1+ γk) it is system
The instant message reception rate of k-th of time slot, r0=1.61bits/s/Hz is the minimal information receiving velocity of system normal communication
Threshold value, hereinSignal-to-noise ratio for receiving end in k-th of time slot, σ2=0.5mw is the noise power of receiving end.
Step S7, using method of Lagrange multipliers, and binary search method, the objective function described in step S6 are combinedIt is solved.The value of obtained optimal Lagrange multiplier is λ*=0.32；Optimal intelligence receiver and energy
Measure receiver handoff factor ρ*(k) value of (1≤k≤K) is as follows：
(1) whenWhen, then ρ*(k)=0；
(2) whenWhen, then ρ*(k)=1；
(3) whenWhen, then ρ*(k)=0.
Step S8, according to step S4 and step S7, obtained each sub-slots intelligence receiver and energy receiver
Handoff factor ρ*(k) value carries out the reception of self-adapting time slot signal.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (7)
1. a kind of SWIPT system self-adaption time slot signal method of reseptance collected based on nonlinear energy, which is characterized in that described
Method of reseptance include the following steps：
S1, transmitting terminal S send signal x to the receiving node D of energy constraint, and a resource block is divided into the K period of the day from 11 p.m. to 1 a.m by receiving node D
Gap is received, and the signal that k-th of time slot receives is：In formula, 1≤k≤K, hkWhen indicating k-th
The channel coefficients of gap obey flat fading, PkIndicate the transmission signal power of the time slot, n is receiving end additive white Gaussian noise；
S2, the handoff factor ρ defined between the intelligence receiver and energy receiver of receiving node D are received in k-th of time slot
Handoff factor between the intelligence receiver and energy receiver of node D is defined as ρ (k), in k-th of time slot, optimal switching system
Number is that the optimal value of ρ (k) is denoted as ρ*(k), receiving node D is according to ρ*(k) value carries out information reception or collection of energy；
S3, according to the reception signal yrk, calculate its performance number Prk=| hk|2Pk, wherein | hk|2It is complex channel coefficient hk's
Mould indicates the channel power gain of k-th of time slot；
S4, according to receive signal performance number Prk, calculate input power of the energy receiver in k-th of time slot of destination node
Pk ER=(1- ρ (k)) | hk|2Prk；
S5, by energy receiver input power Pk ERMultiplied by the output power saturation value after η with energy receiverIt is compared,
Wherein, η is the energy conversion efficiency of destination node energy receiver, ifThen ρ*(k)=1, receiving node D will
Signal is switched to intelligence receiver, which only carries out information reception；Otherwise, following sequential steps are executed；
S6, optimization aim is minimised as with system break probability, handoff factor ρ (k) is optimization object, objective functionWhereinIt is the momentary interruption probability of k-th of time slot of system, is the function of ρ (k)；
S7, using method of Lagrange multipliers, and combine binary search method, to the objective functionIt is asked
Solution obtains optimal intelligence receiver and energy receiver handoff factor ρ*(k)；
The each sub-slots intelligence receiver and energy receiver handoff factor ρ that S8, basis obtain*(k) value carries out adaptive
Time slot signal receives.
2. a kind of SWIPT system self-adaption time slot signal collected based on nonlinear energy according to claim 1 is received
Method, which is characterized in that the value of the handoff factor ρ (k) is 0 or 1, and wherein ρ (k)=1 indicates that the time slot receiving end will
Signal is received for information, and ρ (k)=0 indicates that signal is used for energy and connects collection by the time slot receiving end.
3. a kind of SWIPT system self-adaption time slot signal collected based on nonlinear energy according to claim 1 is received
Method, which is characterized in that the formula of the outage probability is as follows：Wherein rk=ρ (k) log
(1+γk) be k-th of time slot of system instant message reception rate, r0It is the minimal information receiving velocity door of system normal communication
Limit value, hereinSignal-to-noise ratio for receiving end in k-th of time slot, σ2It is the noise power of receiving end.
4. a kind of SWIPT system self-adaption time slot signal collected based on nonlinear energy according to claim 1 is received
Method, which is characterized in that optimal intelligence receiver and energy receiver handoff factor ρ in the step S7*(k) value is such as
Under：
(1) whenWhen, then ρ*(k)=0；
(2) whenWhen, then ρ*(k)=1；
(3) whenWhen, then ρ*(k)=0；
Wherein λ*It is best Lagrange multiplier.
5. a kind of SWIPT system self-adaption time slot signal collected based on nonlinear energy according to claim 1 is received
Method, which is characterized in that the energy conversion efficiency η value of the destination node energy receiver is 1.
6. a kind of SWIPT system self-adaption time slot signal collected based on nonlinear energy according to claim 1 is received
Method, which is characterized in that self-adapting time slot letter signal receives in the step S8, refers to ρ*(k)=1 when, the sub-slots are only
Carry out information reception, ρ*(k)=0 when, which only carries out collection of energy.
7. a kind of SWIPT system self-adaption time slot letter collected based on nonlinear energy according to any one of claims 1 to 5
Number method of reseptance, which is characterized in that the method for reseptance is directed to SWIPT system in point-to-point wireless communication scene,
Channel type is flat fading channel, and sending node S has a fixed and lasting energy supply, receiving node D energy constraint and
The receiver of the energy supply that do not fix, receiving node D consists of two parts：Intelligence receiver and energy receiver, energy
Receiver obtains energy from the radiofrequency signal of ambient enviroment.
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| CN201810418850.1A CN108848558B (en) | 2018-05-04 | 2018-05-04 | Adaptive time slot signal receiving method of SWIPT system based on nonlinear energy collection |
| PCT/CN2018/110447 WO2019210648A1 (en) | 2018-05-04 | 2018-10-16 | Self-adaptive time-slot signal receiving method for swipt system based on nonlinear energy collection |
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| CN201810418850.1A CN108848558B (en) | 2018-05-04 | 2018-05-04 | Adaptive time slot signal receiving method of SWIPT system based on nonlinear energy collection |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109474297B (en) * | 2018-12-28 | 2020-07-14 | 华侨大学 | Full-duplex information and energy simultaneous transmission antenna mode switching transceiver and transceiving method |
| US11296819B2 (en) * | 2019-10-22 | 2022-04-05 | Research & Business Foundation Sungkyunkwan University | Receiver control apparatus and method for simultaneous wireless information and power transmission operating in dual mode |
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| CN111200813B (en) * | 2019-11-22 | 2022-03-22 | 重庆邮电大学 | Large-scale MIMO system maximized minimum user safety energy efficiency optimization method based on SWIPT |
| CN113115426B (en) * | 2021-03-26 | 2022-06-14 | 华南理工大学 | Online power distribution method, system and medium for energy harvesting wireless system |
| CN113099525B (en) * | 2021-06-10 | 2021-09-28 | 华南理工大学 | Wireless energy-carrying receiving equipment and wireless energy-carrying signal receiving method |
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| CN104301977A (en) * | 2014-09-22 | 2015-01-21 | 西安交通大学 | Transmission method in SWIPT system under interference channel |
| CN105119644A (en) * | 2015-09-14 | 2015-12-02 | 哈尔滨工业大学 | Space division mode switching method for single-user MIMO (Multiple Input Multiple Output) system based on SWIPT |
| CN105611633A (en) * | 2015-10-23 | 2016-05-25 | 哈尔滨工业大学 | Receiver resource distribution method based on SWIPT wave beam forming method |
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| US11296819B2 (en) * | 2019-10-22 | 2022-04-05 | Research & Business Foundation Sungkyunkwan University | Receiver control apparatus and method for simultaneous wireless information and power transmission operating in dual mode |
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| WO2019210648A1 (en) | 2019-11-07 |
| CN108848558B (en) | 2020-06-19 |
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