CN108848558B - Adaptive time slot signal receiving method of SWIPT system based on nonlinear energy collection - Google Patents
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Abstract
The invention discloses a method for receiving a self-adaptive time slot signal of an SWIPT system based on nonlinear energy collection, which comprises the following steps of firstly, aiming at the scene of point-to-point communication of the nonlinear energy SWIPT system in a flat fading channel, solving the problems of energy waste and rough resource distribution at a receiving end caused by input signal power saturation of a nonlinear energy receiver of the SWIPT system in a certain time slot; secondly, aiming at a nonlinear energy SWIPT system, the self-adaptive switching of collected information or energy according to the channel state is proposed. The switching coefficient of the information receiver and the energy receiver is optimized, the constructed objective function is simple in form, and partial parameters can be adjusted according to different requirements in different scenes, so that the application flexibility is improved; the solution of the objective function is obtained by an optimization algorithm, the process is simple, no complex mathematical analysis process exists, the actual operation is easy, and two important indexes of the energy acquired by the receiving end and the interruption probability of the system can be simultaneously optimized.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a method for receiving a self-adaptive time slot signal of a wireless information and energy cooperative transmission (SWIPT) system based on nonlinear energy collection.
Background
In some conventional energy-limited wireless networks, the lifetime of the network is often dependent on the battery capacity of the network nodes, so it is important that the node battery energy is sustainable, which usually requires periodic charging of the battery, or replacement of the battery. For an energy-limited network with a severe working environment, battery charging or replacement of nodes is difficult or even impossible, and development of a wireless energy transmission/collection technology is an urgent need.
SWIPT is a technology combining wireless information transmission and wireless energy transmission, and a receiving end consists of an information receiver and an energy receiver, so that the receiver can decode (ID) information of the same radio frequency signal and acquire Energy (EH) from the radio frequency signal on the premise of not increasing extra time and frequency resources. Compared with the traditional uncontrollable energy collection technology that wind energy, solar energy, tidal energy and the like depend on natural environments such as climate and the like, the SWIPT can provide stable, controllable and reliable energy collection, and is the focus of research and attention in the industry in recent years. In the SWIPT system, energy receiving and information decoding at a receiving end utilize the same receiving signal, and how to reasonably distribute system resources is a key problem influencing system performance.
There have been many studies to date which have proposed various methods for resource allocation in a SWIPT system, but the existing methods are mainly directed to linear energy receivers. The invention patent with publication number CN105611633A and publication date 2016, 5, 25, provides a method for reducing base station transmission power by combining beamforming design with resource allocation of a SWIPT system, but the invention is directed to a linear energy receiver and aims at the minimum power transmission of a base station. The invention patent with publication number CN105119644A and publication date 2015, 12, and 2, the single-user MIMO system space division switching method based on SWIPT provides a method for switching an SWIPT system between two modes of energy receiving and information decoding by using a MIMO space division switching technology, but the invention is also directed to a linear energy receiver and does not consider the nonlinearity of the energy receiver.
The actual SWIPT energy receiver has the characteristics of nonlinearity: when the power of the received signal is increased to a certain value, the output power of the energy receiver is saturated and kept unchanged. The existing resource allocation method of the SWIPT system cannot solve the problem of receiving energy waste when the output power of an energy receiver is saturated.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a method for receiving a self-adaptive time slot signal of an SWIPT system based on nonlinear energy collection. The method adopts an energy collection mode based on a time slot switching architecture, takes the minimized interruption probability as an optimization target, optimizes the switching coefficient of an information receiver and an energy receiver, and aims to provide a resource allocation method which is in line with the reality for an SWIPT system.
The purpose of the invention can be achieved by adopting the following technical scheme:
a self-adaptive time slot signal receiving method of an SWIPT system based on nonlinear energy collection comprises the following steps:
s1, the sending end S sends a signal x to a receiving node D with limited energy, the receiving node D divides a resource block into K time slots for receiving, and the signal received by the K time slot is as follows:
in the formula, K is more than or equal to 1 and less than or equal to K, hkThe channel coefficient representing the k-th time slot is subject to flat fading, PkThe sending signal power of the time slot is represented, and n is additive white Gaussian noise of a receiving end;
s2, defining a switching coefficient rho between the information receiver and the energy receiver of the receiving node D, defining the switching coefficient rho between the information receiver and the energy receiver of the receiving node D as rho (k) in the k-th time slot, and recording the optimal switching coefficient rho (k) as the optimal value rho in the k-th time slot*(k) Receiving node D according to rho*(k) Receiving information or collecting energy according to the value;
s3, according to the received signal yrkCalculating its power value Prk=|hk|2PkWherein | hk|2Is the complex channel coefficient hkRepresents the channel power gain of the kth slot;
s4, according to power value P of received signalrkCalculating the input power of the energy receiver of the destination node in the k time slot
S5, inputting power to the energy receiver
Multiplied by η to saturate the output power of the energy receiver
A comparison is made wherein η is the energy conversion efficiency of the destination node energy receiver if
Then ρ*(k) 1, the receiving node D switches the signal to an information receiver, and the time slot only carries out information reception; otherwise, executing the following sequence steps;
s6, defining an objective function by taking the system interruption probability minimization as an optimization objective and the switching coefficient rho (k) as an optimization object
Wherein
Is the instantaneous outage probability of the system kth time slot, which is a function of ρ (k);
s7, utilizing Lagrange multiplier method and combining with binary search method to carry out objective function
Solving is carried out to obtain the optimal switching coefficient rho of the information receiver and the energy receiver*(k)；
S8, according to the obtained information of each time slot, the receiver and the energy receiver switch coefficient rho*(k) And (4) performing adaptive slot signal reception.
Further, the value of the switching coefficient ρ (k) is 0 or 1, where ρ (k) =1 indicates that the time slot receiving end uses the signal for information reception, and ρ (k) =0 indicates that the time slot receiving end uses the signal for energy reception.
Further, the formula of the interruption probability is as follows:
wherein r isk=ρ(k)log(1+γk) Is the instantaneous information reception rate, r, of the system's k-th time slot0Is the minimum information of normal communication of the systemReceiving rate threshold value, here
For the signal-to-noise ratio, σ, of the receiver in the k-th slot2Is the noise power at the receiving end.
Further, the optimal information receiver and energy receiver switching coefficient ρ in step S7*(k) The values are as follows:
(1) when in use
Then ρ*(k)＝0；
(2) When in use
Then ρ*(k)＝1；
(3) When in use
Then ρ*(k)＝0；
Wherein λ*Is the best lagrangian multiplier.
Further, the energy conversion efficiency η of the destination node energy receiver is 1.
Further, the adaptive timeslot signal reception in step S8 refers to ρ*(k) When 1, the time slot only receives information, ρ*(k) When 0, the time slot only performs energy collection.
Further, the receiving method is directed to a point-to-point wireless communication scenario of the SWIPT system, the channel type is a flat fading channel, the sending node S has a fixed and continuous energy supply, the receiving node D has a limited energy supply and no fixed energy supply, and a receiver of the receiving node D is composed of two parts: the system comprises an information receiver and an energy receiver, wherein the energy receiver obtains energy from radio frequency signals of the surrounding environment.
Compared with the prior art, the invention has the following advantages and effects:
1. the invention aims at the scene of point-to-point communication of a nonlinear energy SWIPT system in a flat fading channel, and solves the problem of waste of received energy caused by input signal power saturation of a nonlinear energy receiver of the SWIPT system in a certain time slot.
2. The invention considers to be more in line with the actual requirement, solves the problem that the receiving end of the nonlinear energy SWIPT system roughly distributes resources, enables the nonlinear energy SWIPT system to apply signals to information or to collect and distribute energy in a finer mode, and improves the working efficiency of the nonlinear energy SWIPT system receiver.
3. The invention provides self-adaptive switching and collecting information or energy according to a channel state aiming at a nonlinear energy SWIPT system. The switching coefficient of the information receiver and the energy receiver is optimized, the constructed objective function is simple in form, and partial parameters can be adjusted according to different requirements in different scenes, so that the application flexibility is improved; the solution of the objective function is obtained by an optimization algorithm, the process is simple, no complex mathematical analysis process exists, the actual operation is easy, and two important indexes of the energy acquired by the receiving end and the interruption probability of the system can be simultaneously optimized.
Drawings
Fig. 1 is a flow chart of the adaptive time slot receiving of the nonlinear energy collection SWIPT system of the invention;
FIG. 2 is a complementary flow diagram to FIG. 1;
fig. 3 is a schematic diagram of an information or energy receiver based on time slot switching for a SWIPT system according to the present invention;
FIG. 4 is a diagram of an energy harvesting model of a nonlinear energy receiver of the SWIPT system according to the present invention;
fig. 5 is a schematic diagram of the collection of received signal power versus nonlinear energy in accordance with the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
The embodiment discloses a method for receiving a self-adaptive time slot signal of an SWIPT system based on nonlinear energy collection, which mainly comprises the following steps: optimizing the switching coefficient of the information receiver and the energy receiver, and receiving signals in a self-adaptive time slot according to the optimization result.
In this embodiment, as shown in fig. 1 and fig. 2, a flow of adaptive timeslot receiving core steps of a nonlinear energy collection SWIPT system is shown, an information or energy receiver based on timeslot switching of the SWIPT system according to the present invention is shown in fig. 3, a nonlinear energy receiver energy collection model of the SWIPT system according to the present invention is shown in fig. 4, and a collection diagram of received signal power and nonlinear energy relation according to the present invention is shown in fig. 5.
The implementation steps of this embodiment are as follows:
step S1, the transmitting end S sends a signal x to the receiving node D with limited energy, the receiving node D divides a resource block into K slots for receiving, and the signal received by the kth (K is greater than or equal to 1 and less than or equal to K) slot is:
in the formula hkThe channel coefficient representing the k-th time slot is subject to flat fading, PkAnd n is additive white gaussian noise of a receiving end.
In this embodiment, the transmission time of one resource block is 60s, one resource block is divided into 60 slots for reception, and the power P of the signal transmitted in the K-th (K is greater than or equal to 1 and less than or equal to 60) slot is Pk＝5mw。
Step S2 defines a switching coefficient ρ between the information receiver and the energy receiver of the receiving node D. In the k-th time slot, the switching coefficient between the information receiver and the energy receiver of the receiving node D is defined as ρ (k). In the k-th time slot, the optimal switching coefficient, i.e. the optimal value of rho (k), is recorded as rho*(k) Receiving node D according to rho*(k) The value of (a) is received for information or energy collection. The possible values of the switching coefficient ρ (k) are only 0 and 1, where ρ (k) ═ 1 indicates that the receiving end of the time slot uses the signal for information reception, and ρ (k) ═ 0 indicates that the receiving end of the time slot uses the signal for energy aggregation.
Step S3, receiving the signal y according to the step S1rkCalculating its power value Prk＝|hk|2PkWherein | hk|2Is the complex channel coefficient h described in step S1kRepresents the channel power gain for the k-th slot.
Step S4, the power value P of the received signal according to the step S3rkCalculating the input power of the energy receiver of the destination node in the k time slot
Step S5, inputting the energy receiver input power of the step S4
Multiplied by η to saturate the output power of the energy receiver
Make a comparison if
Then ρ*(k) The receiving node D switches the signal to the information receiver at 1, the time slot only receives the information, otherwise, the following sequential steps are executed, the η is the energy conversion efficiency of the energy receiver at the destination node, η is 1 in the invention, and the output power saturation value of the energy receiver is
Step S6, using the system interruption probability minimization as the optimization target, using the switching coefficient rho (k) as the optimization object, defining the target function
Wherein
Is the instantaneous outage probability of the system's kth time slot, which is a function of ρ (k). In one embodiment, the probability of interruption is expressed by
It is given. Wherein r isk＝ρ(k)log(1+γk) Is the instantaneous information reception rate, r, of the system's k-th time slot01.61bits/s/Hz is the minimum information receiving rate threshold for normal communication in the system, here
For the signal-to-noise ratio, σ, of the receiver in the k-th slot20.5mw is the noise power at the receiving end.
Step S7, combining the Lagrange multiplier method and the binary search method to the target function in the step S6
And (6) solving. The obtained optimal Lagrange multiplier has a value of lambda*0.32; optimal information receiver and energy receiver switching coefficient rho*(k) (1. ltoreq. K. ltoreq.K) has the following values:
(1) when in use
Then ρ*(k)＝0；
(2) When in use
Then ρ*(k)＝1；
(3) When in use
Then ρ*(k)＝0。
Step S8, the receiver receiving the information per time slot obtained according to the steps S4 and S7Receiver switching coefficient rho*(k) And (4) performing adaptive slot signal reception.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (7)
1. A self-adaptive time slot signal receiving method of an SWIPT system based on nonlinear energy collection is characterized by comprising the following steps:
s1, the sending end S sends a signal x to a receiving node D with limited energy, the receiving node D divides a resource block into K time slots for receiving, and the signal received by the K time slot is as follows:
in the formula, K is more than or equal to 1 and less than or equal to K, hkThe channel coefficient representing the k-th time slot is subject to flat fading, PkThe sending signal power of the time slot is represented, and n is additive white Gaussian noise of a receiving end;
s2, defining a switching coefficient rho between the information receiver and the energy receiver of the receiving node D, defining the switching coefficient rho between the information receiver and the energy receiver of the receiving node D as rho (k) in the k-th time slot, and recording the optimal switching coefficient rho (k) as the optimal value rho in the k-th time slot*(k) Receiving node D according to rho*(k) Receiving information or collecting energy according to the value;
s3, according to the received signal yrkCalculating its power value Prk＝|hk|2PkWherein | hk|2Is the complex channel coefficient hkRepresents the channel power gain of the kth slot;
s4, according to power value P of received signalrkCalculating the input power of the energy receiver of the destination node in the k time slot
S5, inputting power to the energy receiver
Multiplied by η to saturate the output power of the energy receiver
A comparison is made wherein η is the energy conversion efficiency of the destination node energy receiver if
Then ρ*(k) 1, the receiving node D switches the signal to an information receiver, and the time slot only carries out information reception; otherwise, executing the following sequence steps;
s6, defining an objective function by taking the system interruption probability minimization as an optimization objective and the switching coefficient rho (k) as an optimization object
Wherein
Is the instantaneous outage probability of the system kth time slot, which is a function of ρ (k);
s7, utilizing Lagrange multiplier method and combining with binary search method to carry out objective function
Solving is carried out to obtain the optimal switching coefficient rho of the information receiver and the energy receiver*(k)；
S8, according to the obtained information of each time slot, the receiver and the energy receiver switch coefficient rho*(k) And (4) performing adaptive slot signal reception.
2. The adaptive time slot signal receiving method for a SWIPT system based on nonlinear energy collection as claimed in claim 1, wherein the value of the switching coefficient p (k) is 0 or 1, where p (k) ═ 1 indicates that the time slot receiving end uses the signal for information reception, and p (k) ═ 0 indicates that the time slot receiving end uses the signal for energy collection.
3. The adaptive timeslot signal receiving method for a SWIPT system based on nonlinear energy collection as claimed in claim 1, wherein the formula of the outage probability is as follows:
wherein r isk＝ρ(k)log(1+γk) Is the instantaneous information reception rate, r, of the system's k-th time slot0Is the minimum information reception rate threshold for normal communication in the system, where
For the signal-to-noise ratio, σ, of the receiver in the k-th slot2Is the noise power at the receiving end.
4. The adaptive time slot signal receiving method for SWIPT system based on nonlinear energy collection as claimed in claim 1, wherein the optimal information receiver and energy receiver switching coefficient p in step S7 is*(k) The values are as follows:
(1) when in use
Then ρ*(k)＝0；
(2) When in use
Then ρ*(k)＝1；
(3) When in use
Then ρ*(k)＝0；
Wherein λ*Is the best lagrangian multiplier.
5. The adaptive time slot signal receiving method of the SWIPT system based on nonlinear energy collection as claimed in claim 1, wherein the energy conversion efficiency η of the destination node energy receiver is 1.
6. The adaptive time slot signal receiving method for SWIPT system based on nonlinear energy collection as claimed in claim 1, wherein the adaptive time slot signal receiving in step S8 refers to p*(k) When 1, the time slot only receives information, ρ*(k) When 0, the time slot only performs energy collection.
7. The adaptive time slot signal receiving method for the SWIPT system based on nonlinear energy collection as recited in any one of claims 1 to 5, wherein the receiving method is for a point-to-point wireless communication scenario of the SWIPT system, the channel type is a flat fading channel, the sending node S has a fixed and continuous energy supply, the receiving node D has limited energy and no fixed energy supply, and the receiver of the receiving node D consists of two parts: the system comprises an information receiver and an energy receiver, wherein the energy receiver obtains energy from radio frequency signals of the surrounding environment.
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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 |
| KR102278037B1 (en) * | 2019-10-22 | 2021-07-15 | 성균관대학교산학협력단 | Method for controlling receiver by transmitter for simultaneous wireless information and power transfer operating in dual mode, adaptive mode switching method based on machine learning, and apparatus for performing the same |
| 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 |
| CN106972880A (en) * | 2017-03-31 | 2017-07-21 | 哈尔滨工业大学 | A kind of low-complexity joint method for precoding of transmitting terminal and relaying based on SWIPT technologies |
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| CN106911376B (en) * | 2017-03-27 | 2021-02-05 | 国网能源研究院有限公司 | Wireless energy drive transmission method and device |
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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 |
| CN106972880A (en) * | 2017-03-31 | 2017-07-21 | 哈尔滨工业大学 | A kind of low-complexity joint method for precoding of transmitting terminal and relaying based on SWIPT technologies |
| CN107896125A (en) * | 2017-12-04 | 2018-04-10 | 华北电力大学（保定） | A kind of safe transmission method of physical layer of full dimension multiple antennas SWIPT systems |
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