WO2023027270A1 - Conception de forme d'onde de transfert d'énergie sans fil multi-utilisateur à large bande tenant compte d'un récupérateur d'énergie non linéaire - Google Patents

Conception de forme d'onde de transfert d'énergie sans fil multi-utilisateur à large bande tenant compte d'un récupérateur d'énergie non linéaire Download PDF

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Publication number
WO2023027270A1
WO2023027270A1 PCT/KR2022/002415 KR2022002415W WO2023027270A1 WO 2023027270 A1 WO2023027270 A1 WO 2023027270A1 KR 2022002415 W KR2022002415 W KR 2022002415W WO 2023027270 A1 WO2023027270 A1 WO 2023027270A1
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Prior art keywords
wireless power
waveform
receivers
phase
transmitter
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PCT/KR2022/002415
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English (en)
Korean (ko)
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박현철
안홍선
황민영
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한국과학기술원
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    • 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
    • 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
    • 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
    • H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
    • 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
    • H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices

Definitions

  • the present invention relates to a wideband multi-user wireless power transmission method and apparatus considering a nonlinear energy harvester.
  • WPT Wireless Power Transfer
  • IoT Internet of Things
  • WPT using RF (Radio frequency) signals can extend the power transmission distance to several meters, and the received RF signal is converted into direct current DC (DC) by an energy harvester used as an energy receiver. ) to supply power to the battery.
  • DC direct current DC
  • RF signals propagate through a wideband channel, and it is difficult for a receiver to receive a signal with sufficient power due to path loss and inter-symbol interference due to multi-path channels.
  • WPT using an RF signal requires a different type of waveform design from conventional wireless power transmission in order to increase the power of a received signal in a receiver.
  • the waveform was designed considering only the operation of the linear region of the energy harvester. This is a method assuming that the relationship between the power of the RF received signal and the output power of the energy harvester converted to DC is linearly proportional.
  • an energy harvester considering an actual diode-based rectifier shows nonlinear RF-to-DC conversion characteristics in which DC output power increases exponentially with respect to an RF received signal exceeding a certain power due to the nonlinear operating characteristics of the diode.
  • the peak amplitude signal refers to a signal of a signal section having the largest amplitude among signals received during one period of the received signal.
  • 1 is a graph showing the relationship between an input signal and an output signal in an operating region of an energy harvester according to the prior art.
  • the average received power of the RF received signal is greater than the waveform (ST 132) with one larger peak. It shows that the DC output voltage of the waveform (PATR 131) where the amplitude signal is present is larger.
  • the prior art [1] designs a power transmission waveform in consideration of a WPT system in which a single transmission antenna and a single user exist.
  • a single-tone waveform concentrating power on the most dominant frequency in the frequency response of a channel was proposed.
  • single-tone waveforms in nonlinear EH have poor energy transfer efficiency.
  • the prior art [2] proposed a model expressing the nonlinear characteristics of EH through Taylor expansion.
  • the optimal power transmission waveform in the WPT system using the model was proposed.
  • the proposed waveform can be obtained through software that solves the convex problem, and is difficult to implement into an actual WPT system because of its high computational complexity and design in the frequency domain.
  • the prior art [3] proposed a more sophisticated nonlinear EH model than the prior art [2].
  • An optimal power transmission waveform in a WPT system with a single transmit antenna and a single user is proposed.
  • the computational complexity of the waveform design is very complex and has the disadvantage of being designed in the frequency domain.
  • a technical problem to be achieved by the present invention is to transmit a multipath channel for a specific user in a broadband wireless power transmission system to a TR (Time Reversal) filter designed by inverting a channel impulse response (CIR) with respect to time and conjugate complexing in a transmitter.
  • An object of the present invention is to provide a TR waveform generation method and system for maximizing Signal to Interference plus Noise Ratio (SINR) using matched filtering with a signal.
  • SINR Signal to Interference plus Noise Ratio
  • IUI Inter User Interface
  • a wireless power transmission method in a multi-path channel proposed in the present invention comprises the steps of arranging channels of a plurality of receivers in reverse order to time for receiving a TR (Time Reversal) waveform transmitted from a transmitter, time Generating a Time Reversal (TR) waveform by using channels of a plurality of receivers arranged in reverse order to the transmitter, and synchronizing the phase difference between the components of the TR waveform to be received in each receiver receiving the TR waveform from the transmitter. Aligning in phase to generate a phase aligned time reversal (PATR) waveform.
  • TR Time Reversal
  • the step of generating the PATR waveform by aligning the phase difference between the components of the TR waveform to be received in each receiver receiving the TR waveform from the transmitter in the same phase at the transmitter is
  • the phase difference between the coherent element composed of matched filtering with the TR waveform received from the first receiver and the non-coherent element due to non-matched filtering between the channel of the first receiver and the TR waveform received from the second receiver is in phase.
  • the step of generating a TR waveform using channels of a plurality of receivers arranged in reverse order with respect to time includes a plurality of TR waveforms to reduce the effect of power reduction of the TR waveform received in the receiver due to the random phase of the information symbol in wireless power transmission.
  • a TR waveform is generated as a periodic signal of a deterministic form, which is a peak amplitude signal of a predetermined magnitude or more by using the nonlinear characteristics of the energy harvester of the receiver.
  • a plurality of conjugate complexed A TR waveform is created by adding all channels of the receiver.
  • the step of arranging the channels of a plurality of receivers in reverse order of time for receiving the TR waveform transmitted from the transmitter is to arrange the channels of the plurality of receivers in reverse order of time in order to reduce complexity in the TR waveform generation process. By arranging, a TR waveform in the time domain is generated.
  • the phase difference between the components of the wireless power signal to be received at each of a plurality of receivers receiving the wireless power signal from the transmitter is in-phase.
  • Setting a phase shift value for alignment and generating a phase aligned time reversal (PATR) waveform that maximizes the sum of the peak amplitude signals of the wireless power signals aligned in the same phase using the set phase shift value in a transmitter. includes
  • the step of setting a phase shift value for aligning phase differences between components of the wireless power signal to be received in each of a plurality of receivers receiving the wireless power signal from the transmitter in the same phase is the peak amplitude signal of the received wireless power signal.
  • a coherent element consisting of matched filtering of the channel of the first receiver among the plurality of receivers and the TR waveform received at the first receiver in order to maximize the sum of the magnitudes of the channel of the first receiver and the channel received at the second receiver
  • the phase shift value is set so that the phases between non-coherent elements due to mismatched filtering with the TR waveform match.
  • the peak amplitude signal in each of the plurality of receivers is expressed as a determinant, and each of the plurality of receivers based on the determinant
  • a phase component of the main eigenvector is obtained through eigenvalue decomposition for , and an optimal phase shift value is set using the phase component of the main eigenvector.
  • the step of generating a PATR (Phase Aligned Time Reversal) waveform that maximizes the sum of the peak amplitude signals of the wireless power signals aligned in the same phase using the set phase shift value in the transmitter is Harvesting)
  • the phase difference between the IUI (Inter User Interference) and the desired signal generated in each of the plurality of receivers is in the same phase sort by
  • the wireless power signal to be received in each of the plurality of receivers is obtained by arranging channels of the plurality of receivers in reverse order with respect to time, and conjugate-complexing the channels of the plurality of receivers arranged in reverse order with respect to time. Then, it may be a TR (Time Reversal) waveform generated by addition.
  • TR Time Reversal
  • a PATR waveform can be generated by flexibly extending it in the time domain using a channel impulse response (CIR) between a plurality of transmit antennas and the plurality of receivers.
  • CIR channel impulse response
  • the transmitter receives a TR (Time Reversal) waveform transmitted from the transmitter.
  • TR Time Reversal
  • Channels of a plurality of receivers arranged in reverse order with respect to time are arranged in reverse order with respect to time, and channels of the plurality of receivers arranged in reverse order with respect to time are conjugated and added together to generate a Time Reversal (TR) waveform.
  • TR Time Reversal
  • the transmitter uses nonlinear characteristics of energy harvesters of a plurality of receivers to reduce the effect of power reduction of the TR waveform received at the receiver due to the random phase of the information symbol in wireless power transmission.
  • a TR waveform is generated as a periodic signal in a deterministic form.
  • the transmitter generates a TR waveform in the time domain by arranging the channels of the plurality of receivers in reverse time order in order to reduce complexity in the process of generating the TR waveform.
  • each of the plurality of receivers includes an energy harvester, and the transmitter receives A PATR that sets a phase shift value for aligning the phase difference between the components of the wireless power signal in the same phase, and maximizes the sum of the peak amplitude signals of the wireless power signal aligned in the same phase using the set phase shift value.
  • a PATR Phase Aligned Time Reversal
  • the transmitter is a coherent element composed of matched filtering of a channel of a first receiver among a plurality of receivers and a TR waveform received by the first receiver in order to maximize the sum of the amplitudes of the peak amplitude signals of the received wireless power signal, and
  • a phase shift value may be set such that a phase between a channel of the first receiver and a non-coherent element due to mismatched filtering of a TR waveform received from the second receiver coincides with the phase.
  • the transmitter expresses the peak amplitude signal in each of the plurality of receivers as a determinant in order to maximize the sum of the magnitudes of the peak amplitude signals of the received wireless power signal, and based on the determinant, a unique value for each of the plurality of receivers
  • a phase component of the main eigenvector is obtained through decomposition, and an optimal phase shift value is set using the phase component of the main eigenvector.
  • the transmitter uses the set phase shift value to increase the EH (Energy Harvesting) power in each of the plurality of receivers in a wireless power transmission environment in a multi-path channel Inter User Interference (IUI) occurring in each of the plurality of receivers and the phase difference between the desired signals is aligned in phase.
  • EH Energy Harvesting
  • IUI Inter User Interference
  • the transmitter transmits a wireless power signal to the plurality of receivers, and the wireless power signal arranges channels of the plurality of receivers in reverse order with respect to time, and conjugates the channels of the plurality of receivers arranged in reverse order with respect to time.
  • a TR (Time Reversal) waveform generated by addition-, by arranging the channels of the plurality of receivers in reverse order to time to generate a TR waveform in the time domain, the plurality of transmit antennas of the transmitter and the plurality of receivers
  • a PATR waveform is generated by flexibly extending in the time domain using CIR (Channel Impulse Response) between a plurality of transmit antennas of the transmitter and the plurality of receivers as the number of is increased.
  • CIR Channel Impulse Response
  • a TR Time Reversal filter designed by inverting a CIR (channel impulse response) with respect to time and conjugate complexing it in a transmitter through a TR waveform generated according to embodiments of the present invention is applied to a specific user.
  • SINR Signal to Interference plus Noise Ratio
  • SINR can be maximized by using matched filtering of a multipath channel and a transmission signal for a multipath channel.
  • 1 is a graph showing the relationship between an input signal and an output signal in an operating region of an energy harvester according to the prior art.
  • FIG. 2 is a diagram showing the configuration of a broadband multi-user wireless power transmission system considering a nonlinear energy harvester according to an embodiment of the present invention.
  • FIG. 3 is a diagram for explaining a wireless power transmission method in a multi-path channel using a TR waveform according to an embodiment of the present invention.
  • FIG. 4 is a diagram for explaining a wireless power transmission method in a multi-path channel using a PATR waveform according to an embodiment of the present invention.
  • FIG. 5 is a diagram showing TR and PATR waveforms for a plurality of users in a multi-user wireless power transmission system according to an embodiment of the present invention.
  • FIG. 6 is a graph comparing EH power sums with power magnitudes of transmission waveforms according to an embodiment of the present invention.
  • FIG. 7 is a graph comparing EH power sums for an increase in the number of transmit antennas according to an embodiment of the present invention.
  • the present invention proposes a technique for designing a wideband multi-user wireless power transmission waveform considering a nonlinear energy harvester.
  • a time reversal (TR) waveform is suitable for wireless power transmission (WPT) considering the nonlinear operating characteristics of an energy harvester.
  • the TR filter which is designed by inverting the CIR (Channel Impulse Response) with respect to time and conjugate complexing in the transmitter of the wireless power transmission system, uses matched filtering between the multi-path channel for a specific user and the transmission signal in the broadband wireless power transmission system. It was proposed to maximize SINR (Signal to Interference plus Noise Ratio).
  • a received signal composed of matched filtering of a multipath channel for a specific user and a TR transmission signal is referred to as a desired signal.
  • Such a TR waveform can be usefully used in a wireless power transmission system using nonlinear EH (Energy Harvesting) by generating a high peak amplitude signal using the characteristics of a multi-path channel without increasing the transmission power, and point-to-point It can generate the highest peak amplitude signal in a point communication system.
  • EH Expongy Harvesting
  • a transmission signal is formed by convolution of a TR waveform with an information symbol having a stochastic distribution, resulting in undesirable phase rotation in a received signal.
  • the TR waveform suitable for wireless power transmission can be achieved by constructing a transmission signal with deterministic symbols to increase the power of the received signal.
  • the TR waveform according to an embodiment of the present invention can be an optimal waveform in a point-to-point wireless power transmission system.
  • IUI Inter User Interference
  • a Phase Aligned Time Reversal (PATR) waveform that is aligned so that the phases of each user's request signal and the IUI generated under the influence of another user coincide with each other is proposed.
  • PATR Phase Aligned Time Reversal
  • FIG. 2 is a diagram showing the configuration of a broadband multi-user wireless power transmission system considering a nonlinear energy harvester according to an embodiment of the present invention.
  • a broadband multi-user wireless power transmission system considering the proposed nonlinear energy harvester includes a transmitter 210 having a plurality of transmit antennas and a plurality of receivers 220.
  • a MIMO WPT system including a power transmitter 210 having M transmit antennas and U receivers 220 is shown.
  • Each of the U receivers 220 includes an energy harvester.
  • the received signal of the U-th receiver can be expressed as:
  • a TR signal is composed of convolution with random information symbols having a probability distribution.
  • the existing TR signal has been proposed as a deterministic type of periodic signal in a given multi-path channel as described above.
  • the load resistance value is the receiver antenna resistance value, is the thermal voltage, is the reverse saturation current, represents the diode ideality factor.
  • a transmitter 210 having a plurality of transmit antennas of a broadband multi-user wireless power transmission system considering a nonlinear energy harvester according to an embodiment of the present invention includes a plurality of receivers 220 for receiving TR (Time Reversal) waveforms transmitted from the transmitter. ) are arranged in reverse order with respect to time, channels of a plurality of receivers arranged in reverse order with respect to time are conjugated, and added to generate a Time Reversal (TR) waveform.
  • TR Time Reversal
  • the transmitter 210 uses nonlinear characteristics of energy harvesters of a plurality of receivers in advance to reduce the effect of power reduction of a TR waveform received from a receiver due to a random phase of an information symbol in wireless power transmission.
  • a TR waveform is generated as a periodic signal of a deterministic form, which is a peak amplitude signal of a predetermined magnitude or more.
  • the transmitter 210 generates a TR waveform in the time domain by arranging the channels of the plurality of receivers in reverse order to reduce the complexity of the process of generating the TR waveform.
  • Each of the plurality of receivers 220 of the broadband multi-user wireless power transmission system considering the nonlinear energy harvester according to an embodiment of the present invention includes an energy harvester.
  • the plurality of receivers 220 receive a wireless power signal from a transmitter.
  • the transmitter 210 sets a phase shift value for aligning the phase differences between the components of the wireless power signal to be received by the plurality of receivers 220 in the same phase, and uses the set phase shift value to align the components in the same phase.
  • PATR Phase Aligned Time Reversal
  • the transmitter 210 maximizes the sum of the amplitudes of the peak amplitude signals of the wireless power signals to be received by the plurality of receivers 220. phase shift so that the phases of the coherent element composed of matched filtering with the TR waveform received from the first receiver and the non-coherent element due to non-matched filtering of the channel of the first receiver and the TR waveform received from the second receiver are matched set the value
  • the transmitter 210 converts the peak amplitude signal from each of the plurality of receivers into a matrix in order to maximize the sum of the amplitudes of the peak amplitude signals of the wireless power signals to be received at the plurality of receivers 220. Based on the matrix equation, a phase component of a main eigenvector is obtained through eigenvalue decomposition for each of the plurality of receivers, and an optimal phase shift value is set using the phase component of the main eigenvector.
  • the transmitter 210 uses the set phase shift value to increase energy harvesting (EH) power in each of a plurality of receivers in a wireless power transmission environment in a multi-path channel.
  • EH energy harvesting
  • a phase difference between an Inter User Interference (IUI) and a desired signal generated in is aligned in phase.
  • IUI Inter User Interference
  • the transmitter 210 transmits a wireless power signal to the plurality of receivers 220.
  • the wireless power signal according to an embodiment of the present invention is TR (Time Reversal) waveform.
  • TR Time Reversal
  • the plurality of transmit antennas of the transmitter and the plurality of transmit antennas of the transmitter as the number of the plurality of receivers increases by generating a TR waveform in the time domain by arranging channels of the plurality of receivers in reverse order with respect to time.
  • a PATR waveform can be generated by flexibly expanding in the time domain using CIR (Channel Impulse Response) between receivers.
  • CIR Channel Impulse Response
  • FIG. 3 is a diagram for explaining a wireless power transmission method in a multi-path channel using a TR waveform according to an embodiment of the present invention.
  • a method for generating a TR waveform in a wideband multi-user wireless power transmission method considering the proposed nonlinear energy harvester includes the steps of arranging channels of a plurality of receivers in reverse order with respect to time for receiving a TR (Time Reversal) waveform transmitted from a transmitter. (310) Generating a Time Reversal (TR) waveform using channels of a plurality of receivers arranged in reverse order with respect to time (320) and configuring a TR waveform to be received in each receiver receiving the TR waveform from the transmitter.
  • PATR Phase Aligned Time Reversal
  • channels of a plurality of receivers for receiving TR (Time Reversal) waveforms transmitted from the transmitter are arranged in reverse order of time.
  • the TR waveform in the time domain can be generated by arranging the channels of the plurality of receivers in reverse order of time.
  • a Time Reversal (TR) waveform is generated using channels of a plurality of receivers arranged in reverse order with respect to time.
  • a peak having a predetermined size or more is used by using nonlinear characteristics of energy harvesters of a plurality of receivers.
  • a TR waveform can be generated as a periodic signal of deterministic form, which is an amplitude signal. More specifically, a TR waveform may be generated by conjugate-complexing channels of a plurality of receivers arranged in the reverse order of time and then adding all channels of the plurality of receivers that have been complex-conjugated.
  • a Phase Aligned Time Reversal (PATR) waveform is generated by aligning phase differences between components of the TR waveform to be received at each receiver receiving the TR waveform from the transmitter in the same phase.
  • PATR Phase Aligned Time Reversal
  • a coherent element composed of matched filtering of a channel of a first receiver among a plurality of receivers and a TR waveform received at the first receiver and a channel of the first receiver and a channel received at the second receiver
  • the phase difference between non-coherent elements due to mismatched filtering with the TR waveform can be aligned in phase.
  • a TR waveform used in conventional wireless information transmission is proposed in a form suitable for wireless power transmission.
  • the waveform can be designed relatively simply through CIR in the time domain.
  • the proposed PATR waveform can increase the EH power in an energy receiver by aligning the phase difference between the IUI component and the request signal component generated by each user in the same phase in a multi-user WPT environment.
  • EH power is increased by utilizing a gain of a multi-path channel
  • wireless power transmission efficiency can be improved.
  • a separate communication process is not required in the transmitter other than a channel learning process for obtaining CIR, and power can be efficiently transmitted to EH users equipped with actual rectifiers having nonlinear characteristics.
  • FIG. 4 is a diagram for explaining a wireless power transmission method in a multi-path channel using a PATR waveform according to an embodiment of the present invention.
  • a method for generating a PATR waveform in a broadband multi-user wireless power transmission method considering the proposed nonlinear energy harvester converts the phase difference between the components of the wireless power signal to be received in each of a plurality of receivers receiving the wireless power signal from the transmitter into the same phase.
  • PATR phase aligned time reversal
  • step 410 a phase shift value for aligning phase differences between components of a wireless power signal to be received in each of a plurality of receivers receiving the wireless power signal from the transmitter in the same phase is set.
  • a channel of a first receiver among a plurality of receivers and a TR waveform received by the first receiver are configured with matched filtering.
  • a phase shift value may be set such that a phase between a coherent element and a non-coherent element due to mismatched filtering between a channel of the first receiver and a TR waveform received in the second receiver coincides with a phase.
  • the peak amplitude signal in each of the plurality of receivers is expressed as a determinant, and based on the determinant, the plurality of receivers Phase components of the main eigenvectors are obtained through eigenvalue decomposition for each, and an optimal phase shift value can be set using the phase components of the main eigenvectors.
  • step 420 the transmitter generates a Phase Aligned Time Reversal (PATR) waveform that maximizes the sum of the peak amplitude signals of the wireless power signals aligned in the same phase using the set phase shift value.
  • PATR Phase Aligned Time Reversal
  • the phase difference between the (Inter User Interference) and the desired signal may be aligned in phase.
  • the wireless power signal to be received in each of the plurality of receivers is obtained by arranging channels of the plurality of receivers in reverse order with respect to time, and conjugate-complexing the channels of the plurality of receivers arranged in reverse order with respect to time. Then, it may be a TR (Time Reversal) waveform generated by addition.
  • TR Time Reversal
  • a TR waveform is generated in the time domain by arranging channels of the plurality of receivers in reverse order with respect to time, thereby generating a plurality of transmission antennas of the transmitter and the transmitter as the number of the plurality of receivers increases.
  • a PATR waveform can be generated by flexibly extending in the time domain using CIR (Channel Impulse Response) between a plurality of transmit antennas and the plurality of receivers.
  • the proposed TR waveform that achieves optimal performance in a single-user environment can be constructed by arranging the channels between two users in the transmit antenna in reverse order with respect to time, complexing them, and adding them, which can be expressed as:
  • the peak amplitude signal of the received signal can be analyzed.
  • the peak amplitude signal of each user's received signal can be expressed as:
  • the peak amplitude signal of each user's received signal is a coherent term composed of matched filtering of that user's channel and the transmitted signal, and a non-coherent term, which is an IUI component resulting from non-coherent filtering of the transmitted signal for other users. It consists of runt elements (non-coherent terms).
  • a peak amplitude signal of the received signal composed of the sum of the two signals may decrease in magnitude due to a phase difference between the two components.
  • phase difference between the two components is equal to the phase of the non-coherent component, it can be estimated at the transmitter as:
  • the transmit signal of the PATR waveform is the phase shift value class can be added and designed as follows:
  • the peak amplitude signal component of each user's received signal can be expressed as:
  • the phases of the coherent element and the non-coherent element constituting the peak amplitude signal of the received signal for both users completely coincide. Therefore, the magnitude of the peak amplitude signal of the received signal, which is the sum of the two components, increases. Consequently, the output DC power of the energy harvester increases.
  • FIG. 5 is a diagram showing TR and PATR waveforms for a plurality of users in a multi-user wireless power transmission system according to an embodiment of the present invention.
  • FIG. 5(a) is a graph showing TR waveforms of each of two users
  • FIG. 5(b) is a graph showing PATR waveforms of each of two users.
  • the magnitude of the peak amplitude signal of the received signal which is the sum of the two elements, is reduced due to the phase difference between the coherent element and the non-coherent element of the received signal of the TR waveform according to the embodiment of the present invention.
  • the received signal of the PATR waveform according to the embodiment of the present invention it can be seen that the phases of the two elements coincide and the magnitude of the peak amplitude signal of the received signal increases.
  • the waveform is designed to maximize the sum of the peak amplitude signal magnitudes of the received signals of all users by setting the phase shift value so that the coherent element and the non-coherent element match each user as much as possible.
  • the transmission signal of the m-th transmit antenna can be expressed as:
  • the component of the peak amplitude signal of the u-th user's received signal can be expressed as:
  • the actual channel between all users at all transmit antennas is defined as:
  • the peak amplitude signal of the received signal can be expressed as:
  • the peak amplitude signal of the received signal of all users can be expressed in the form of a matrix as shown in the following equation:
  • phase vector maximizing the component by the Rayleigh quotient Is It consists of the phase of the dominant eigenvector corresponding to the largest eigenvalue of and can be expressed as:
  • Is is the largest eigenvector of
  • the PATR waveform in a multi-user environment can be designed as:
  • FIG. 6 is a graph comparing EH power sums with power magnitudes of transmission waveforms according to an embodiment of the present invention.
  • the ST waveform is a waveform proposed in the prior art [1], and is an optimal WPT waveform in linear EH.
  • the TR and PATR waveforms show better EH performance compared to the ST waveform, and the PATR waveform achieves better received power performance than the TR waveform due to the effect of the phase alignment of the received signal.
  • FIG. 7 is a graph comparing EH power sums for an increase in the number of transmit antennas according to an embodiment of the present invention.
  • PATR As the number of EH users increases, a received power gain can be obtained through phase alignment, so that a maximum of 2.43 times greater EH power can be obtained compared to the TR waveform. Through this, it can be confirmed that the proposed PATR achieves a higher sum of received power as the number of users increases with a constant number of transmit antennas and transmit power.
  • the phase of IUI occurring to each user is aligned in the same phase to increase the peak amplitude of the received signal so that all users can increase the EH power gain. You can get it.
  • Convenience in management and maintenance is provided by simultaneously and continuously supplying wireless power to a plurality of small wireless devices through a wideband multi-user wireless power transmission waveform considering a nonlinear energy harvester according to an embodiment of the present invention, and spatial constraints of wireless device deployment can alleviate
  • the present invention supplies power wirelessly in a system in which a plurality of wireless devices exist, it is convenient to manage and maintain the devices and relieves spatial restrictions in deploying wireless devices, so it is suitable for application to an IoT network.
  • the proposed technology Since the proposed technology has excellent EH performance in an environment where many devices exist, it is advantageous to continuously supply power in a network where many devices exist. Therefore, the demand for the technology proposed in the present invention will increase to meet the demand for wireless charging of the IoT network, in which the number of wireless devices increases.
  • devices and components described in the embodiments may include, for example, a processor, a controller, an arithmetic logic unit (ALU), a digital signal processor, a microcomputer, a field programmable array (FPA), It may be implemented using one or more general purpose or special purpose computers, such as a programmable logic unit (PLU), microprocessor, or any other device capable of executing and responding to instructions.
  • a processing device may run an operating system (OS) and one or more software applications running on the operating system.
  • a processing device may also access, store, manipulate, process, and generate data in response to execution of software.
  • the processing device includes a plurality of processing elements and/or a plurality of types of processing elements. It can be seen that it can include.
  • a processing device may include a plurality of processors or a processor and a controller. Other processing configurations are also possible, such as parallel processors.
  • Software may include a computer program, code, instructions, or a combination of one or more of the foregoing, which configures a processing device to operate as desired or processes independently or collectively. You can command the device.
  • Software and/or data may be any tangible machine, component, physical device, virtual equipment, computer storage medium or device, intended to be interpreted by or provide instructions or data to a processing device.
  • can be embodied in Software may be distributed on networked computer systems and stored or executed in a distributed manner.
  • Software and data may be stored on one or more computer readable media.
  • the method according to the embodiment may be implemented in the form of program instructions that can be executed through various computer means and recorded on a computer readable medium.
  • the computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. Program commands recorded on the medium may be specially designed and configured for the embodiment or may be known and usable to those skilled in computer software.
  • Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks and magnetic tapes, optical media such as CD-ROMs and DVDs, and magnetic media such as floptical disks.
  • - includes hardware devices specially configured to store and execute program instructions, such as magneto-optical media, and ROM, RAM, flash memory, and the like.
  • Examples of program instructions include high-level language codes that can be executed by a computer using an interpreter, as well as machine language codes such as those produced by a compiler.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Transmitters (AREA)
  • Radio Transmission System (AREA)

Abstract

L'invention concerne un procédé et un appareil de transfert d'énergie sans fil multi-utilisateur à large bande tenant compte d'un récupérateur d'énergie non linéaire, et le procédé de transfert d'énergie sans fil dans un canal à trajets multiples proposé par la présente invention comprend les étapes consistant à : agencer, dans un ordre inverse de temps, des canaux d'une pluralité de récepteurs pour recevoir des formes d'onde à inversion temporelle (TR) transmises à partir d'un émetteur ; générer des formes d'onde TR à l'aide des canaux de la pluralité de récepteurs, qui sont agencés dans l'ordre inverse de temps ; et générer, par l'émetteur, des formes d'onde à inversion temporelle à alignement de phase (PATR) par alignement, en phase, des différences de phase entre les composants des formes d'onde TR devant être reçus par chaque récepteur recevant les formes d'onde TR provenant de l'émetteur.
PCT/KR2022/002415 2021-08-24 2022-02-18 Conception de forme d'onde de transfert d'énergie sans fil multi-utilisateur à large bande tenant compte d'un récupérateur d'énergie non linéaire WO2023027270A1 (fr)

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KR1020210111435A KR102593833B1 (ko) 2021-08-24 2021-08-24 비선형 에너지 하베스터를 고려한 광대역 다중 사용자 무선 전력 송신 파형 설계
KR10-2021-0111435 2021-08-24

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KR102153809B1 (ko) 2018-11-16 2020-09-08 한국과학기술원 Iot 센서의 정류기 성능을 고려한 무선 전력 송신 방법 및 장치
KR102179030B1 (ko) 2018-12-19 2020-11-16 한국과학기술원 무선 전력 통신 네트워크에서 사용자들의 충전 시간을 최소화하기 위한 다중 안테나 전송 방법 및 장치

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KR20180095632A (ko) * 2015-12-17 2018-08-27 오시아 인크. 다중경로 차량 환경에서 무선 전력 트랜스퍼를 위한 시스템 및 방법
US20170302109A1 (en) * 2016-04-19 2017-10-19 Samsung Electronics Co., Ltd. Wireless power transmitter utilizing phase and amplitude control algorithm and wireless power receiver
KR20180107012A (ko) * 2017-03-21 2018-10-01 성균관대학교산학협력단 개별신호발생기를 이용한 무선 전력 송신 장치 및 방법
KR20190128926A (ko) * 2018-05-09 2019-11-19 숭실대학교산학협력단 지능적 원거리 무선전력전송 시스템 및 그 방법
KR20210066376A (ko) * 2019-11-28 2021-06-07 한국과학기술원 광대역 다중 경로 채널에서 다중 안테나를 이용한 무선 전력 전송 기법

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