KR20160109013A

KR20160109013A - Communication apparatus and communication method using sunlight beamforming

Info

Publication number: KR20160109013A
Application number: KR1020150032607A
Authority: KR
Inventors: 김성만
Original assignee: 경성대학교 산학협력단
Priority date: 2015-03-09
Filing date: 2015-03-09
Publication date: 2016-09-21
Also published as: KR101660891B1

Abstract

The present invention, in the solar beam forming communication method using a solar light modulating device for communicating with a terminal through a solar optical modulation, comprising: a step of obtaining location information of the terminal; a step of receiving a digital signal comprised of a binary value from an outside; and a step of modulating a phase of an incident solar light concentrating in a direction corresponding to the location information of the terminal based on the binary value of the digital signal. Accordingly, the present invention can transmit a digital signal to a certain terminal by beam forming solar light entering through a solar light modulation.

Description

TECHNICAL FIELD [0001] The present invention relates to a solar beam forming communication device,

The present invention relates to a solar beam forming communication device and a communication method thereof, and more particularly to a solar beam modulating device for communicating with a terminal through solar light modulation, And a method for transmitting a digital signal to the terminal.

Recently, solar energy is attracting much attention as an eco-friendly energy resource. Solar energy is pollution-free energy without greenhouse gas emissions. It has the advantage of being able to produce a variety of applications and uses, because it has less local biomass production than conventional fossil fuels. In addition, since solar energy is an infinite energy source that human beings can ultimately use, solar energy is currently attracting attention in various fields.

Particularly, when solar light having a visible light region is combined with communication technology, it can be used not only in an environment in which electromagnetic waves are not used but harmless to the human body and electromagnetic waves can cause malfunction of the apparatus, Has a wide potential bandwidth that is incomparable and has an advantage of being highly likely to develop in the future.

However, in order to perform communication using such a solar light, there is a problem that the light path between the transmitting end and the receiving end must overcome a multipath channel environment characteristic in which a plurality of multipaths exist in the room.

KR 10-1462359 B1

An object of the present invention is to solve the above problems and provide a solar beam forming communication device capable of transmitting a digital signal to a specific terminal by beamforming sunlight incident through solar modulation, And to provide the above objects.

A solar beam forming communication method using a solar light modulating apparatus for communicating with a terminal through solar light modulation according to an embodiment of the present invention includes the steps of acquiring position information of the terminal, And modulating the phase of the sunlight to be focused in a direction corresponding to the position information of the terminal based on the binary value of the digital signal.

In addition, a solar light modulation apparatus for communicating with a terminal through solar light modulation according to an embodiment of the present invention includes an incident unit for receiving sunlight, a first communication unit for acquiring position information of the terminal from the terminal, A second communication unit for receiving a digital signal having a binary value from outside; an optical modulator for phase modulating the incident sunlight so as to be condensed in a predetermined direction; And controls the light modulation unit to modulate the phase of sunlight incident so as to be converged in the corresponding direction.

The terminal capable of communicating with the solar light modulating apparatus according to an embodiment of the present invention includes a position information collecting unit for collecting position information of the terminal, a communication unit for transmitting the collected position information to the solar light modulating apparatus, A photodetector for receiving the light output from the photodetector; an optical signal reading unit for determining the intensity of the received light; and a controller for comparing the intensity of the determined light with a predetermined threshold value, And a digital signal generating unit for generating a digital signal including the value of the digital signal.

According to the present invention, there is an effect that a digital signal can be transmitted to a specific terminal by beamforming sunlight incident through solar modulation.

1 is a flowchart showing a method of communicating a solar beam forming according to an embodiment of the present invention,
2 is a block diagram illustrating a configuration of a solar light modulation apparatus and a terminal according to an embodiment of the present invention,
3 is a diagram showing a state of modulating and outputting the phase of sunlight incident so as to be converged in a direction corresponding to the position information of the terminal in the solar light modulation apparatus according to the present invention,
4 is a diagram showing a state in which a phase of sunlight incident is modulated and output so as not to be condensed in a direction corresponding to position information of a terminal in a solar light modulation apparatus according to the present invention,
5 is a diagram showing a Fresnel lens function used in phase modulation of incident sunlight in a solar light modulation apparatus according to the present invention,
6 is a graph for comparing waveforms of signals received by the terminal before and after performing the solar beam forming communication according to the present invention,
FIG. 7 is another graph illustrating the signal waveform of FIG. 6 as characterized.

The foregoing and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. Like reference numerals refer to like elements throughout the specification.

FIG. 1 is a flow chart showing a method of communicating a solar beam forming according to an embodiment of the present invention. FIG. 3 is a flowchart illustrating a method of transmitting a solar light beam according to an embodiment of the present invention. 4 is a diagram showing a state in which the phase of sunlight incident is modulated and output so as not to be condensed in the direction corresponding to the positional information of the terminal in the photovoltaic device according to the present invention And FIG. 5 is a diagram showing a Fresnel lens function used in phase modulation of incident sunlight in the photovoltaic device according to the present invention.

Hereinafter, a method for communicating a solar beam forming according to an embodiment of the present invention will be described in detail with reference to the drawings.

First, the position information of the terminal 200 is acquired from the terminal 200 in the photovoltaic device 100 for communicating with the terminal 200 through the photovoltaic modulation (S10).

The location information of the terminal 200 may include location information provided according to a Global Positioning System (GPS), a Cellular Positioning System (CPS), a Wi-Fi-based Positioning System (WPS)

Next, the photodetector 100 receives a binary digital signal from the outside (S20).

Here, the digital signal may be received from outside through a network connected by wireless or wire.

Next, on the basis of the binary value of the digital signal received in step S20, the photodetector 100 modulates the phase of the incident sunlight so as to be converged in a direction corresponding to the position information of the terminal 200 S30).

If the binary number of the digital signal corresponds to '1', the modulating step modulates the phase of the incident sunlight so as to be converged in a direction corresponding to the position information of the terminal, 0 ', the phase of incident sunlight can be modulated so as not to be condensed in a direction corresponding to the position information of the terminal.

For example, referring to FIGS. 3 and 4, if the binary number of the digital signal received in step S20 corresponds to '1', a direction corresponding to the position information of the terminal 200 in the solar cell modulation apparatus 100 When the binary number of the digital signal received in step S20 corresponds to '0', the photodetector 100 modulates the phase of the incident sunlight in the direction corresponding to the position information of the terminal 200 Modulates the phase of incident sunlight so as not to be condensed, and outputs the solar light signal modulated in step S40, which will be described later.

That is, when the binarized value of the digital signal received by the solar cell modulation apparatus 100 corresponds to '1' and outputs the solar light signal condensed by the terminal 200, the intensity of the light received by the terminal 200 And when the binary value of the digital signal received by the solar cell modulation device 100 corresponds to '0' to output a solar light signal that is not condensed in the terminal 200, It is possible to determine what the digital signal received by the photovoltaic device 100 is, based on the intensity of the light received at the terminal 100, since the light intensity will be low.

Meanwhile, in the modulating step, the phase of the incident sunlight can be modulated by using a Fresnel lens function which is a phase modulation function.

5, the Fresnel lens function is a formula for calculating the focal length of the lens based on the wavelength of incident light and the radius of the lens, which can be calculated according to the following formula I have.

(I)

Where L is the focal length of the lens, R is the radius of the lens, and [lambda] is the wavelength of light.

For example, when the Fresnel lens function is applied to the solar beam forming communication method according to an embodiment of the present invention, the focal length L of the lens is calculated based on the position information of the terminal 200 received in step S10 First, the wavelength? Of the incident sunlight and the radius R of the lens are determined.

Next, based on the first clock signal having a predetermined frequency in the photodetector 100, the modulated solar light signal corresponding to the binary value received in step S20 is output (S40).

Next, in step S50, the terminal 200 compares the intensity of light received in step S40 with a preset threshold and generates a digital signal including a binary value corresponding thereto.

Here, the terminal 200 may receive light output from the photovoltaic apparatus 100 based on a second clock signal having a preset frequency (S45). At this time, the frequency of the first clock signal and the frequency of the second clock signal may be the same.

Next, in step S60, the terminal 200 outputs the digital signal generated in step S50 to the outside based on a third clock signal having a frequency higher than the frequency of the second clock signal.

For example, if the frequency at which the solar light signal modulated from the solar cell modulation device 100 is output and the frequency at which the solar cell 100 receives light from the solar cell device 200 is low If the frequency of outputting the digital signal including the binary value generated based on the intensity of the light received by the terminal 200 is set high, the communication speed using the solar modulation can be increased.

2 is a block diagram illustrating a configuration of a solar light modulation apparatus and a terminal according to an embodiment of the present invention.

2, a photovoltaic apparatus 100 for communicating with a terminal 200 through photovoltaic modulation according to an exemplary embodiment of the present invention includes an incident unit 110 A first communication unit 120, a second communication unit 130, an optical modulation unit 140, a light output unit 150, and a control unit 160. The first communication unit 120, the second communication unit 130,

The incident portion 110 is for the sunlight to be incident.

The first communication unit 120 is for acquiring the location information of the terminal 200 from the terminal 200.

The second communication unit 130 is for receiving a digital signal having a binary value from the outside.

Here, the second communication unit 130 may include a communication module for a wired or wireless network, and may receive a digital signal from the outside through the communication module.

For example, the second communication unit 130 may include a communication module corresponding to various communication methods such as Bluetooth, Wi-Fi, zigbee, IR communication, and RF communication.

The light modulator 140 is for modulating the phase of the sunlight incident through the incident portion 110 such that the sunlight is condensed in a predetermined direction.

Here, the optical modulator 140 can modulate the phase of the sunlight incident through the incidence portion 110 using a Fresnel lens function, which is a phase modulation function.

(I)

For example, when the Fresnel lens function is applied to the photovoltaic device 100 according to an embodiment of the present invention, based on the position information of the terminal 200 received through the first communication unit 120, The focal length L is first determined, and then the wavelength? Of incident sunlight and the radius R of the lens are determined.

The light output unit 150 is for outputting light phase-modulated by the light modulating unit 140.

The controller 160 is for controlling the light modulator 140 and the light output unit 150.

First, the control unit 160 modulates the phase of the incident sunlight so as to be converged in the direction corresponding to the position information of the terminal 200, based on the binary value of the digital signal received through the second communication unit 130 And controls the optical modulator 140. [

Specifically, when the binary value of the digital signal received through the second communication unit 130 corresponds to '1', the control unit 160 determines that the digital signal is converged in a direction corresponding to the position information of the terminal 200 When the binary value of the digital signal received through the second communication unit 130 corresponds to '0', the phase of the solar light is changed so that it is not condensed in the direction corresponding to the position information of the terminal 200 It is possible to control the phase of the light to be modulated.

Next, the controller 160 controls the second communication unit 130 to output the modulated solar light signal corresponding to the binary value of the digital signal received through the second communication unit 130, based on the first clock signal having the preset frequency And controls the output unit 150.

3 and 4, when the binary value of the digital signal received through the second communication unit 130 corresponds to '1', the optical modulator 140 controls the position of the terminal 200 The light modulator 140 modulates the phase of incident sunlight so as to be condensed in the direction corresponding to the information and corresponds to the position information of the terminal 200 when the binary value of the received digital signal corresponds to ' And then outputs the modulated solar light signal through the optical output unit 150. [0042] The light output unit 150 outputs the modulated solar light signal.

Meanwhile, the light receiving unit 230 of the terminal 200, which will be described later, receives the light output from the light output unit 150 based on the second clock signal having a preset frequency. At this time, the frequency of the first clock signal and the frequency of the second clock signal may be the same.

2, a terminal 200 capable of communicating with the solar modulation apparatus 100 according to an exemplary embodiment of the present invention includes a location information collecting unit 210, a communication unit 220, A light receiving unit 230, an optical signal reading unit 240, a digital signal generating unit 250, and a signal output unit 260. A portable multimedia player (PMP), a digital multimedia broadcasting (DMB), and a digital multimedia broadcasting (DMB) A terminal, an E-Book, a portable computer (Notebook, Tablet, Netbook, etc.), or a digital camera.

The location information collecting unit 210 is for collecting location information of the terminal 200.

Here, the position information collecting unit 210 includes a GPS (Global Positioning System) module for acquiring a signal from the satellite, a CPS (Cellular Positioning System) module for acquiring a signal from the base station of the mobile communication system, and a Wi- Wi-Fi-based Positioning System (WPS) module for acquiring a wireless signal.

The communication unit 220 is for transmitting position information collected through the position information collecting unit 210 to the solar photodetector.

The light receiving unit 230 is for receiving light output from the photovoltaic apparatus 100. [

Here, the light receiving unit 230 may receive the light output from the solar modulation device 100 based on the second clock signal having a predetermined frequency.

The optical signal reading unit 240 is for determining the intensity of the light received through the light receiving unit 230.

Here, the optical signal reading unit 240 may extract the central region of the light received by the light receiving unit 230 to determine the intensity of the received light.

Specifically, the optical signal reading unit 240 converts the color space of the light received by the light receiving unit 230 into a HSI (Hue-Saturation-Intensity) coordinate system in RGB (Red-Green-Blue) Extracts a contour line of the received light, extracts a center area of the received light based on the extracted contour, and then determines the intensity of the light included in the center area.

The digital signal generator 250 compares the intensity of light determined through the optical signal reading unit 240 with a preset threshold value and generates a digital signal including a binary value corresponding to the intensity.

Specifically, when the intensity of the light discriminated through the optical signal reading unit 240 exceeds the threshold value, the digital signal generating unit 250 generates a digital signal including the binary value '1' And generates a digital signal including a binary value '0' when the intensity of the light discriminated through the signal reading unit 240 is less than the threshold value and is equal to or lower than a lower limit threshold value smaller than the threshold value, 240 may be less than the lower limit threshold value, the digital signal may not be generated.

The signal output unit 260 outputs the digital signal generated by the digital signal generating unit 250 to the outside based on a third clock signal having a frequency higher than the frequency of the second clock signal.

For example, if the frequency at which the terminal 200 receives the light output from the photomodulation apparatus 100 is low, the binary value generated based on the intensity of the light received at the terminal 200 may be If the frequency at which the digital signal is output is set to be high, the communication speed using the solar modulation can be increased.

FIG. 6 is a graph for comparing waveforms of signals received by the terminal before and after performing the solar beam forming communication according to the present invention, and FIG. 7 is another graph illustrating the signal waveform of FIG.

6 and 7, when the solar beam forming communication according to the present invention is not performed, a flat graph with no signal waveform is displayed. However, when the beam forming communication is performed, the modulated digital signal A graph of a signal waveform having a predetermined amplitude is displayed.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

100: Solar light modulating device 110: Incident part
120: first communication unit 130: second communication unit
140: optical modulation unit 150: optical output unit
160: control unit 200:
210: position information collecting unit 220:
230: optical receiver 240: optical signal reader
250: digital signal generation unit 260: signal output unit

Claims

A method of communicating with a solar beam using a solar modulator for communicating with a terminal through solar modulation,
Obtaining location information of the terminal;
Receiving a digital signal composed of binary values from outside; And
And modulating the phase of the incident sunlight to be focused in a direction corresponding to the position information of the terminal based on the binary value of the digital signal.

The method according to claim 1,
Wherein the modulating comprises:
Modulates the phase of incident sunlight to be converged in a direction corresponding to the position information of the terminal when the binary value of the digital signal corresponds to '1'
And modulating the phase of incident sunlight so that the binary signal is not condensed in a direction corresponding to the position information of the terminal when the binary value of the digital signal corresponds to '0'.

The method according to claim 1,
After the modulating step,
Further comprising the step of outputting a modulated solar signal corresponding to a binary value of the digital signal based on a first clock signal having a predetermined frequency.

The method of claim 3,
After the outputting step,
Further comprising generating a digital signal including a binary value corresponding to the intensity of the received light by comparing the intensity of light received at the terminal with a preset threshold value .

5. The method of claim 4,
Wherein the generating comprises:
And generating a digital signal including a binary value '1' when the intensity of the received light exceeds the threshold at the terminal,
And generating a digital signal including a binary value '0' if the intensity of the received light is less than the threshold value in the terminal.

6. The method of claim 5,
Wherein the generating comprises:
And generating a digital signal including a binary value '0' if the intensity of the received light is lower than the threshold value and is lower than the threshold value lower than the threshold value,
Wherein the digital signal is not generated when the strength of the received light is lower than the lower limit threshold value in the terminal.

5. The method of claim 4,
Between the step of outputting and the step of generating,
Further comprising the step of receiving light output from the solar modulating device based on a second clock signal having a predetermined frequency in the terminal.

8. The method of claim 7,
Wherein the frequency of the first clock signal is the same as the frequency of the second clock signal.

5. The method of claim 4,
After the generating step,
Further comprising the step of outputting the digital signal to the outside based on a third clock signal having a frequency higher than the frequency of the second clock signal in the terminal.

1. A solar light modulation apparatus for communicating with a terminal through solar modulation,
An incident portion on which sunlight is incident;
A first communication unit for acquiring location information of the terminal from the terminal;
A second communication unit for receiving a digital signal composed of binary values from outside;
An optical modulator for phase-modulating the incident sunlight so as to be condensed in a predetermined direction; And
And a control unit for controlling the light modulation unit to modulate a phase of sunlight incident so as to be converged in a direction corresponding to the position information of the terminal based on the binary value.

11. The apparatus according to claim 10,
Modulates the phase of incident sunlight to be converged in a direction corresponding to the position information of the terminal when the binary value of the digital signal corresponds to '1'
And controls the optical modulator to modulate a phase of incident sunlight so that the binary signal is not condensed in a direction corresponding to the position information of the terminal if the binary value of the digital signal corresponds to '0'.

11. The method of claim 10,
And a light output section for outputting the phase-modulated light,
Wherein the control unit controls the optical output unit to output a modulated solar light signal corresponding to the binary value based on a first clock signal having a predetermined frequency.

A terminal capable of communicating with a solar modulating device,
A location information collecting unit for collecting location information of the terminal;
A communication unit for transmitting the collected position information to the solar modulation device;
A light receiving unit for receiving light output from the solar modulation device;
An optical signal reading unit for determining the intensity of the received light; And
And a digital signal generation unit for comparing a predetermined threshold value with the intensity of the discriminated light and generating a digital signal including a binary value corresponding to the determined threshold value.

14. The method of claim 13,
Wherein the digital signal generating unit comprises:
And generating a digital signal including a binary value '1' when the intensity of the discriminated light exceeds the threshold value,
And generates a digital signal including a binary value '0' if the determined light intensity is less than the threshold value.

15. The method of claim 14,
Wherein the digital signal generating unit comprises:
And generating a digital signal including a binary value '0' when the intensity of the discriminated light is less than the threshold value and equal to or less than a lower limit threshold value that is less than the threshold value,
And does not generate a digital signal if the intensity of the discriminated light is less than the lower limit threshold value.

14. The method of claim 13,
Wherein the light receiving unit receives the output light based on a second clock signal having a preset frequency.

17. The method of claim 16,
And a signal output unit for outputting the generated digital signal to the outside based on a third clock signal having a frequency higher than the frequency of the second clock signal.

14. The method of claim 13,
The optical signal reading unit includes:
Wherein the light receiving unit extracts a central region of light received by the light receiving unit and determines the intensity of the received light.