WO2017086520A1

WO2017086520A1 - Device for underwater communication through dimming control of visible light

Info

Publication number: WO2017086520A1
Application number: PCT/KR2015/012699
Authority: WO
Inventors: 류창형; 우희성; 송인호
Original assignee: 코아글림 주식회사
Priority date: 2015-11-19
Filing date: 2015-11-25
Publication date: 2017-05-26
Also published as: KR20170058731A

Abstract

The present invention relates to a device for underwater communication through dimming control of a visible light. More particularly, the present invention relates to a device for underwater communication through dimming control of a visible light, which performs underwater wireless communication using visible light wireless communication through dimming control of a light-emitting diode (LED) flickering state. The device for underwater communication through dimming control of a visible light comprises: a transmitting unit (100) for receiving an input data signal, modulating the input data signal into a light signal, and transmitting the light signal through dimming control of an LED; and a receiving unit (200) for receiving a light signal transmitted from the transmitting unit (100) through a photo detector, demodulating the light signal into a data signal, and outputting the data signal, wherein the transmitting unit (100) performs wireless communication by controlling a flickering state through dimming control of the light-emitting diode according to a predetermined brightness value (dimmer).

Description

Underwater communication device through dimming control of visible light

The present invention relates to an underwater communication apparatus through dimming control of visible light, and more particularly, to divers that are located underwater or between divers using visible light communication (VLC) capable of dimming control. The present invention relates to an underwater communication apparatus through dimming control of visible light, which enables underwater communication capable of performing pseudo communication and information transmission wirelessly between ships.

Underwater wireless communication includes the presence of ships or reefs using fish finders to check for fish in the water, echo sounders to check the shape of the seabed and reefs, sons to detect the sound of screws such as submarines for military use, and reflected waves according to ultra-short pulse Active sonar to investigate. Recently, a method of performing underwater wireless communication using ultrasonic waves has also been developed.

In the case of radio waves which are widely used in wireless communication, since they are scattered and absorbed in water and are not suitable in water, wireless communication is generally performed underwater.

However, the ultrasonic waves have a problem in that the transmission speed is low, the time delay is large, and the bandwidth is narrow, so that the data rate is low.

Korean Unexamined Patent Publication No. 2010-0031445 (published date 2010.03.22, hereinafter referred to as Prior Art 1) discloses a communication device for performing underwater wireless communication, and a modulation section and a modulation section modulated to receive and transmit an ultrasonic signal. A modulator for generating a transmission symbol by inserting a guard interval at the front or the rear of the amplifier, an amplifier for amplifying an ultrasonic signal, an ultrasonic sensor for transmitting and receiving an ultrasonic signal using an underwater channel, and a channel coding unit for coding an underwater channel, and a modulation signal A demodulator for demodulating a signal into an original signal is disclosed.

Prior art 1 minimizes signal interference due to multiple paths that can occur underwater and improves the efficiency of information transmission, while an error due to the transmission and reception of ultrasonic signals in consideration of an underwater environment that can improve transmission efficiency in underwater wireless communication. The purpose of the present invention is to minimize information transmission efficiency and to improve communication reliability.

However, since the ultrasonic signal is used, as described above, the bandwidth of the communication is narrow and the data rate is low, and the expensive device such as the ultrasonic sensor and the channel coding unit is included, and thus the cost is high. There is a problem that occurs.

In addition, due to the insecure ultrasonic communication method, the risk of eavesdropping is included.

On the other hand, the underwater communication apparatus through the dimming control of the visible light of the present invention can perform the underwater communication using the visible light communication capable of dimming control.

Visible light communication (VLC) refers to a light emitting diode using a wavelength of visible light among the light emitting diodes by using a property of converting electricity of a lighting device, that is, light-emitting diode (LED) into light. Applied in the field of communication, it means that the light emitting diode can communicate while maintaining its original lighting function.

In other words, it is a communication system that transmits and receives data wirelessly using light generated from an LED lighting device, that is, visible light. It is a wireless communication technology that delivers information wirelessly using light in the visible wavelength band that humans can recognize with their eyes. The visible light wireless communication technology is distinguished from the conventional wired optical communication technology and infrared wireless communication in terms of using light in the visible light wavelength band (780 nm to 380 nm), and is distinguished from the wired optical communication technology in that the communication environment is wireless.

In addition, unlike the RF (Response Frequency) wireless communication currently widely used, visible light wireless communication technology has excellent convenience and physical security that can be freely used without being regulated or licensed in terms of frequency use, and users can see the communication link. It is distinguished by the fact that it can be confirmed, and above all, it has the characteristics as a fusion technology that can acquire the unique purpose and communication function of the light source at the same time.

[Preceding technical literature]

[Patent Documents]

Domestic Publication No. 2010-0031445 (published date 2010.03.22.)

The present invention has been made to solve the problems of the prior art as described above, the object of the present invention is to use the visible light communication (VLC, Visible Light Communication) capable of dimming (dive) between divers or underwater The present invention provides an underwater communication apparatus through dimming control of visible light, which enables underwater communication capable of performing communication and information transmission wirelessly between a diver and a ship.

Underwater communication apparatus through the dimming control of visible light according to an embodiment of the present invention, underwater communication through the dimming control of visible light performing underwater wireless communication using visible light wireless communication through the dimming (dimming) control of the LED blinking state In the apparatus, the data signal is received and modulated into an optical signal, and transmitted from the transmitter 100 and the transmitter 100 for transmitting an optical signal through dimming control of a light-emitting diode (LED). Receiving the received optical signal through a photo detector (Photo Detector), characterized in that it comprises a receiver 200 for demodulating and outputting the optical signal into a data signal, the transmitter 100 is underwater, a predetermined brightness The dimming control of the light emitting diode according to the value dimmer controls the flashing state to perform wireless communication.

At this time, the underwater communication device through the dimming control of the visible light is characterized in that it further comprises a power supply unit 300 for supplying operating power to the transmitter 100 and the receiver 200,

The transmitter 100, the receiver 200 and the power supply 300 is characterized in that it further comprises a waterproof housing 400 accommodated therein.

In detail, the transmitter 100 includes at least one light emitting diode (LED), and input means 110 for receiving an analog or digital signal for transmission from the outside, and analog to the input means 110. When a signal is input, a data frame is applied to the first code converter 120 for converting the signal into a digital signal, the digital signal input to the input means 110, or the digital signal converted by the code converter 120. ) And detects an error of the digital signal, converts the data modulator 130 for inserting the encryption code and the digital signal modulated by the data modulator 130 into an electrical signal, and converts the electrical signal into an optical signal. By converting, the light emitting control unit 140 to control the blinking state through the dimming control of the light emitting diode to emit an optical signal.

In addition, the receiver 200 includes at least one photo detector PD, and receives the optical signal transmitted from the transmitter 100 using the electrical signal detector, and converts the visible signal into an electrical signal. A light receiving unit 210, a signal recovery unit 220 for amplifying the electrical signal converted by the visible light receiving unit 210, and restores to a digital signal, and a digital signal restored by the signal recovery unit 220 to demodulate the digital signal A data demodulator 230 for checking an abnormality of a data frame, a second code converter 240 for converting the digital signal demodulated by the data demodulator 230 into an outputable analog signal, and the second code converter And an output unit 250 for receiving and outputting the converted analog signal at 240.

The underwater communication device through the dimming control of the visible light of the present invention by the above configuration by using the visible light communication (VLC, Visible Light Communication) by the light-emitting diode (LED) capable of dimming (dimming) control There is an advantage that can perform underwater wireless communication capable of communicating and transmitting information wirelessly between the diver between the diver or in the water and onboard.

That is, the underwater communication device through the dimming control of the visible light of the present invention controls the blinking state of the LED by the total length of the data frame, according to the preset brightness value (dimmer) using an external switch, the LED brightness value efficiency Adjusting to 30%, 50% or 70% has the advantage of performing wireless communication through visible light communication underwater.

In addition, since wireless communication is performed underwater using the visible light of the environmentally friendly LED, without additional investment, there is an advantage of excellent security, high data transmission speed, and low cost.

1 is a view showing an underwater communication apparatus through dimming control of visible light according to an embodiment of the present invention.

2 is a diagram illustrating a transmitter 100 of an underwater communication device through dimming control of visible light according to an embodiment of the present invention.

3 is a diagram illustrating a receiver 200 of an underwater communication apparatus through dimming control of visible light according to an embodiment of the present invention.

Hereinafter, an underwater communication apparatus through dimming control of visible light of the present invention will be described in detail with reference to the accompanying drawings. The drawings introduced below are provided by way of example so that the spirit of the invention to those skilled in the art can fully convey. Accordingly, the present invention is not limited to the drawings presented below and may be embodied in other forms. Also, like reference numerals denote like elements throughout the specification.

At this time, if there is no other definition in the technical terms and scientific terms used, it has a meaning commonly understood by those of ordinary skill in the art to which the present invention belongs, the gist of the present invention in the following description and the accompanying drawings Descriptions of well-known functions and configurations that may be unnecessarily blurred are omitted.

In other words, it is a communication system that transmits and receives data wirelessly using light generated from an LED lighting device, that is, visible light. It is a wireless communication technology that delivers information wirelessly using light in the visible wavelength band that humans can recognize with their eyes. This visible light wireless communication technology is distinguished from the existing wired optical communication technology and infrared wireless communication in terms of using light in the visible wavelength band (780 nm to 380 nm) by sending data by blinking LEDs at an invisible speed. It is distinguished from wired optical communication technology in that the environment is wireless.

The visible light wireless communication technology is a free space optic (FSO) technology, which uses optical propagation light in free space for transmitting and receiving data between two devices installed on a line-of-sight (LOS). Technology.

1 is a diagram illustrating an underwater communication apparatus through dimming control of visible light according to an embodiment of the present invention. Referring to Figure 1 will be described in detail with respect to the underwater communication device through the dimming control of visible light according to an embodiment of the present invention.

The underwater communication apparatus through dimming control of visible light according to an embodiment of the present invention may be configured to include a transmitter 100 and a receiver 200, as shown in Figure 1, included in the transmitter 100 Underwater wireless communication may be performed using visible light wireless communication through dimming control of a blinking LED.

That is, the underwater communication device through the dimming control of the visible light of the present invention controls the blinking state of the LED by the total length of the data frame according to the preset brightness value (dimmer) using an external switch, thereby improving the LED brightness value efficiency. By adjusting, there is an advantage that can perform wireless communication through visible light communication underwater.

The underwater communication device through the dimming control of the visible light of the present invention may be provided with an input means for inputting a data signal to the transmitting unit 100 to the oxygen mask of the skin scuba equipment in one embodiment, the receiving unit 200 As an output means, the skin scuba equipment can be connected to the end face of the goggles, but it can also be connected to more diverse locations.

Underwater communication apparatus through the dimming control of the visible light of the present invention may further include a power supply unit 300 for supplying power for operation to the transmitter 100 and the receiver 200, so that the easy to use underwater The transmitter 100, the receiver 200, and the power supply 300 may further include a waterproof housing 400 accommodated therein.

To learn more about each configuration,

The transmitter 100 may receive a data signal in water, modulate the data signal into an optical signal, and transmit the optical signal through dimming control of the light emitting diode.

The transmitter 100 transmits an optical signal by controlling a blinking state of the light emitting diode by adjusting the brightness value efficiency of the LED according to a brightness value (dimmer) previously set (selected) by using an external switch. Underwater wireless communication can be performed.

As described above, the transmitter 100 may include at least one light emitting diode, and as shown in FIG. 2, the input unit 110, the first code converter 120, and the data modulator. 130 and the light emission controller 140 may be configured.

The input unit 110 may receive an analog or digital signal for transmission from the outside in the water. The input unit 110 may receive a voice analog signal through a microphone or the like or a digital signal through a connection terminal interface for communication between devices. However, the present invention is not limited thereto and may be applied as a device capable of inputting more various signals.

The first code converter 120 may convert the analog signal into a digital signal when the analog signal is input to the input unit 110. That is, by determining whether the input signal is an analog signal or a digital signal, in the case of an analog signal, digital conversion for generating a data frame may be performed.

The voice analog signal having continuous time and amplitude can be modulated into a digital signal, and in general, the analog signal can be modulated into a digital signal through sampling, quantizing, and encoding. .

The sampling is a step of detecting analog signals of continuous signal waveforms at predetermined time intervals, and the quantization is a step of adjusting PAM signals detected through the sampling to values for finite numbers of codes. The encoding is a step of representing the amplitude of the quantized digital signal pulse in binary. Through the sampling, quantization, and encoding processes, the voice analog signal may be modulated into the digital signal.

The data modulator 130 generates a data frame for a digital signal input to the input means 100 or a digital signal converted by the first code converter 120, and generates a digital frame. The error can be detected and an encryption code can be inserted.

The data modulator 130 may generate a data frame in which a code for detecting an error of the digital signal and other encryption codes are inserted into the digital signal. Through this, an error that may occur in the process of modulating an analog signal to a digital signal may be detected, and an encryption code may be inserted.

In detail, the data modulator 130 may generate a data frame consisting of a preamble signal, data, and a CRC code by performing Manchester-OOK modulation, and a preamble signal is placed at the front of the data packet. It is located in the same pattern as the simple information about the digital signal. It only serves to illuminate the LED light and signify the beginning of the packet.

When transmitting data over a wireless channel, the CRC code is preferably inserted as a check value to check whether an error has occurred in the transmitted data.

The light emission controller 140 converts the digital signal modulated by the data modulator 130 into an electrical signal, converts the electrical signal into an optical signal, and controls a blinking state through dimming control of the light emitting diode. Can emit.

The light emission controller 140 selects and generates an invalid pattern according to a brightness value (dimmer) previously set (selected) by using an external switch, and generates a total length of the data frame generated by the data modulator 130. Dimming control can be performed by adjusting 30%, 50% or 70% of the LED brightness value efficiency using the blinking state of the LED. In addition, even if there is no data input, it is preferable to control the blinking state of the LED through an invalid pattern except for data.

In detail, the light emission controller 140 may control the blinking state of the light emitting diode according to a brightness value preset (selected) using an external switch. By controlling the blinking state of the light emitting diode at an invisible speed, it can be adjusted to 30%, 50% or 70% of the LED brightness value efficiency, it is possible to perform wireless communication through visible light communication underwater. together,

The receiver 200 receives an optical signal transmitted from the transmitter 100 in the water through a photo detector (PD). In this case, the optical signal indicates a blinking state of the light emitting diode. The signal can be demodulated into a data signal and output.

As described above, the receiver 200 may include at least one photo detector, and as shown in FIG. 3, the visible light receiver 210, the signal restorer 220, and the data demodulator 230. ), The second code conversion unit 240 and the output means 250 may be configured.

The visible light receiving unit 210 may receive an optical signal transmitted from the transmitter 100 using the photo detector, and convert the optical signal received through the photo detector into an electrical signal. At this time, through the photo detector, the received optical signal, like the light emitting diode of the transmitter 100, can detect light in the visible wavelength band, the visible wavelength band used is preferably in the range of 780nm ~ 380nm.

The signal recovery unit 220 may amplify the electrical signal converted by the visible light receiving unit 210 and restore the digital signal.

The signal recovery unit 220 may amplify a weak electric signal, reshape the signal, and restore the digital signal.

The data demodulator 230 may demodulate the digital signal reconstructed by the signal reconstructor 220 to check whether there is an abnormality in the data frame of the digital signal. That is, an error can be detected.

The data demodulator 230 may detect data by performing correlation of the preamble signal included in the received data frame and performing Manchester-OOK demodulation. In addition, it is possible to determine whether an error has occurred in the data frame by detecting an error of the CRC code.

The second code converter 240 may convert the digital signal demodulated by the data demodulator 230 into an outputable analog signal.

That is, the second code converter 240 may convert the demodulated digital signal into a signal that can be output from the output means 250.

The second code converter 240 may convert a digital signal into an analog signal through decoding and filtering. The decoding means returning a digital signal to a PAM, that is, a signal at the time of being detected by sampling, and the filtering may restore the PAM signal to an analog signal which is a principle input signal.

The output means 250 may receive and output the analog signal converted by the second code converter 240 in the water.

The output means 250 may be output in accordance with the received signal, in the case of a voice analog signal may be output to the speaker, it may be output a digital signal through a connection terminal interface for communication between devices. However, the present invention is not limited thereto and may be applied as a device capable of inputting more various signals.

In other words, the underwater communication device through dimming control of visible light according to an embodiment of the present invention performs underwater wireless communication by dimming and controlling the blinking state of the LED, thereby realizing an environmentally friendly and low cost underwater wireless communication device. There are advantages to it.

As described above, the present invention has been described by specific embodiments such as specific components and the like, but the embodiments are provided only for the purpose of better understanding of the present invention, and the present invention is limited to the above embodiment. However, various modifications and variations are possible to those skilled in the art to which the present invention pertains.

Therefore, the spirit of the present invention should not be limited to the described embodiments, and all the things equivalent to or equivalent to the claims as well as the following claims will fall within the scope of the present invention. .

[Description of the code]

100: transmitter

110: input means 120: first code conversion unit

130: data modulator 140: light emission controller

200: receiver

210: visible light receiving unit 220: signal recovery unit

230: data demodulation unit 240: second code conversion unit

250 output means

300: power supply

400: waterproof housing

Claims

In the underwater communication device through the dimming control of visible light performing underwater wireless communication using visible light wireless communication through the dimming control of the LED blinking state,

A transmitter 100 which receives a data signal, modulates it into an optical signal, and transmits an optical signal through dimming control of a light-emitting diode (LED); And

A receiver 200 for receiving an optical signal transmitted from the transmitter 100 through a photo detector, demodulating the optical signal into a data signal, and outputting the demodulated signal;

Characterized in that it comprises a,

The transmitter 100

Underwater, the underwater communication device through the dimming control of visible light, characterized in that for performing a wireless communication by controlling the flashing state by dimming control of the light emitting diode according to a predetermined brightness value (dimmer).
The method of claim 1,

Underwater communication device through the dimming control of the visible light

A power supply unit 300 for supplying operation power to the transmitter 100 and the receiver 200;

Underwater communication device through the dimming control of the visible light further comprising.
The method of claim 2,

Underwater communication device through the dimming control of the visible light

A waterproof housing 400 in which the transmitter 100, the receiver 200, and the power supply 300 are accommodated therein;

Underwater communication device through the dimming control of the visible light further comprising.
The method of claim 1,

The transmitter 100

It comprises at least one light emitting diode (LED),

Input means 110 for receiving an analog or digital signal for transmission from the outside;

A first code converter 120 for converting an analog signal into a digital signal when the input means 110 is input;

Data modulation for generating a data frame on the digital signal input to the input means 110 or the digital signal converted by the code converter 120, detecting an error of the digital signal, and inserting an encryption code. Unit 130; And

The light emission controller 140 converts the digital signal modulated by the data modulator 130 into an electric signal, converts the electric signal into an optical signal, and controls a blinking state through dimming control of the light emitting diode to emit an optical signal. );

Underwater communication device through dimming control of visible light, characterized in that it comprises a.
The method of claim 1,

The receiver 200 is

It comprises at least one photo detector (PD),

A visible light receiving unit 210 which receives an optical signal transmitted from the transmitter 100 by using an electrical signal of the photo detector and converts the optical signal into an electrical signal;

A signal recovery unit 220 amplifying the electric signal converted by the visible light receiving unit 210 and restoring the digital signal into a digital signal;

A data demodulator 230 for demodulating the digital signal reconstructed by the signal reconstructor 220 and confirming whether a data frame of the digital signal is abnormal;

A second code converter 240 for converting the digital signal demodulated by the data demodulator 230 into an outputable analog signal; And

Output means (250) for receiving and outputting the analog signal converted by the second code converter (240);

Underwater communication device through dimming control of visible light, characterized in that it comprises a.