SIMULTANEOUS WIRELESS INFORMATION AND POWER TRANSMISSION METHOD, AND TRANSMISSION APPARATUS AND RECEPTION APPARATUS USING THE SAME

• US 20180026820A1
• Filed: 01/06/2017
• Published: 01/25/2018
• Est. Priority Date: 07/20/2016
• Status: Active Grant

• Current Assignee: SungKyunKwan University's Research & Business Foundation (SungKyunKwan University)
• Original Assignee: SungKyunKwan University's Research & Business Foundation (SungKyunKwan University)
• Inventors: KIM, Dong In, MOON, Jong Ho, PARK, Jong Jin, LEE, Kang Yoon
• Granted Patent: US 10,708,102 B2
• Time in Patent Office: Days
• CPC Class Codes: H02J 50/20 using microwaves or radio frequency waves
• CPC Class Codes: H04L 27/02 Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation H04L27/32 takes precedence
• CPC Class Codes: H04L 27/2614 Peak power aspects
• CPC Class Codes: H04L 27/30 wherein each code element is represented by a combination of frequencies

Abstract

A simultaneous wireless information and power transmission method includes: transmitting an energy transfer signal comprising a peak-to-average power ratio (PAPR) corresponding to information to be transmitted at a first side; measuring the PAPR by receiving the energy transfer signal at a second side; and recovering the information from the measured PAPR at the second side.

Claims

1. A simultaneous wireless information and power transmission method, comprising:

transmitting an energy transfer signal comprising a peak-to-average power ratio (PAPR) corresponding to information to be transmitted at a first side;

measuring the PAPR by receiving the energy transfer signal at a second side; and

recovering the information from the measured PAPR at the second side.

2. The simultaneous wireless information and power transmission method of claim 1, wherein, in the transmitting of the energy transfer signal, the energy transfer signal is a signal in which N (N=1, 2, . . . , Q) tones having different frequencies are superimposed, and wherein the information to be transmitted comprises log₂Q-bits of digital data (Q, N:

natural numbers).

3. The simultaneous wireless information and power transmission method of claim 1, further comprising periodically or aperiodically:

transmitting a pilot signal at the second side;

receiving the pilot signal and estimating a channel status from the received pilot signal at the first side; and

calculating an amplitude and a phase of the energy transfer signal from the estimated channel status at the first side.

4. The simultaneous wireless information and power transmission method of claim 3, wherein the calculating of the amplitude and the phase of the energy transfer signal from the estimated channel status at the first side further comprises aligning phases of tones included by being superimposed in the energy transfer signal received at the second side.

5. The simultaneous wireless information and power transmission method of claim 3, wherein:

the calculating of the amplitude and the phase of the energy transfer signal from the estimated channel status at the first side further comprises matching an amplitude and the phase by performing calculation according to

6. The simultaneous wireless information and power transmission method of claim 1, wherein the second side is any one of a wearable device, an Internet of things (IoT) device, and a bio sensor.

7. The simultaneous wireless information and power transmission method of claim 1, further comprising charging an energy storage device by rectifying the energy transfer signal received at the second side.

8. The simultaneous wireless information and power transmission method of claim 1, wherein the transmitting of the energy transfer signal further comprises transmitting the energy transfer signal for each group among a number of groups, wherein the energy transfer signal for each group comprises a signal including tones having different frequencies and formed by being linearly superimposed with each other.

9. The simultaneous wireless information and power transmission method of claim 8, wherein the measuring of the PAPR further comprises receiving the energy transfer signal for each group, splitting the energy transfer signal for each group according to an allocated channel sub-band, and measuring the PAPR for the energy transfer signal of each group.

10. The simultaneous wireless information and power transmission method of claim 1, wherein the transmitting of the energy transfer signal is performed by transmitting the energy transfer signal for each group among a number of groups, and the energy transfer signal for each group comprises a signal formed by superimposing a number of tones having different frequencies allocated to different wireless sensor groups.

11. The simultaneous wireless information and power transmission method of claim 8, wherein:

the measuring of the PAPR is performed by receiving the energy transfer signal for each group, and the energy transfer signal for each group is split according to a sub-band allocated to different wireless sensor groups; and

the PAPR for the energy transfer signal of the split group is measured.

12. The simultaneous wireless information and power transmission method of claim 1, wherein the transmitting of the energy transfer signal further comprises transmitting an I/O modulated signal.

13. The simultaneous wireless information and power transmission method of claim 10, further comprising recovering information from the I/O modulated signal by:

obtaining a number of different frequencies included by being superimposed in the energy transfer signal transmitted by the first side from the measured PAPR at the second side;

superimposing tones having different frequencies corresponding to the number of different frequencies; and

obtaining a difference signal corresponding to a difference between the received signal and a signal obtained by the superimposing of the tones having the different frequencies corresponding to the number of different frequencies.

14. A simultaneous wireless information and power transmission apparatus, comprising:

a signal generator configured to generate an energy transfer signal;

a modulator configured to control the signal generator such that the energy transfer signal comprises a peak-to-average power ratio (PAPR) corresponding to information to be transmitted; and

an antenna configured to radiate the energy transfer signal.

15. The simultaneous wireless information and power transmission apparatus of claim 14, wherein the signal generator is configured to form the energy transfer signal by linearly superimposing N (N=1, 2, . . . , Q) tones having different frequencies to have the PAPR corresponding to information, and wherein the information to be transmitted comprises log₂Q bits of digital data (Q, N:

natural numbers).

16. The simultaneous wireless information and power transmission apparatus of claim 14, further comprising a matcher configured to match phases of multi-tones of the energy transfer signal such that phases of the energy transfer signal received by a reception apparatus are aligned.

17. The simultaneous wireless information and power transmission apparatus of claim 14, further comprising a matcher configured to select a sub-band corresponding to a frequency-fading channel (FFC) among a number of channels through which the energy transfer signal passes, and to perform amplitude matching such that an amplitude of the received energy transfer signal in the selected sub-band is large in comparison to an amplitude of the received energy transfer signal in an unselected sub-band.

18. A simultaneous wireless information and power reception apparatus, comprising:

an antenna configured to receive an energy transfer signal;

a rectifier configured to acquire an energy transfer signal output from the antenna, rectify the energy transfer signal output from the antenna, and output the rectified energy transfer signal;

an energy storage device configured to be charged by a signal output by the rectifier; and

a demodulator configured to measure a peak-to-average power ratio (PAPR) of the rectified energy transfer signal and demodulate the information corresponding to the PAPR.

19. The simultaneous wireless information and power reception apparatus of claim 18, wherein the rectifier further comprises a pilot signal provider configured to provide a pilot signal for estimating a channel status.

20. The simultaneous wireless information and power reception apparatus of claim 18, further comprising a power splitter configured to split the received energy transfer signal by a predetermined power ratio.

21. The simultaneous wireless information and power reception apparatus of claim 18, further comprising band-pass filters configured to have different pass-bands corresponding to sub-bands of an energy transfer signal for each group, among a number of groups, included in the received energy transfer signal.

22. The simultaneous wireless information and power reception apparatus of claim 18, wherein the reception apparatus is further configured to receive an I/O modulated signal, and further comprises:

a signal former configured to receive the number of tones having different frequencies included in the received energy transfer signal by being superimposed with each other and form a signal modulated based on the PAPR;

a subtractor configured to receive a first signal in which the received energy transfer signal and the I/O modulated signal are superimposed with each other and the signal modulated based on the PAPR, estimate a difference between the first signal and the signal modulated based on the PAPR, and output the I/O modulated signal; and

a down converter configured to convert the I/O modulated signal into a baseband by performing down conversion on the I/O modulated signal.

23. The simultaneous wireless information and power reception apparatus of claim 18, wherein the reception apparatus comprises any one of a wearable device, an Internet of things (IoT), and a bio sensor.