KR102131096B1 - Inter-vehicle communication system based on visible light communication - Google Patents

Abstract

The present invention relates to a communication system between vehicles based on a visible light communication. In particular, a communication system between vehicles based on an LED lamp installed at a vehicle being driven comprises: a data generating unit which generates a data frame including traffic information of the vehicle; a modulation unit which modulates the data frame generated by the data generating unit based on a color shift keying (CSK) modulation method; a transmitting unit which transmits the modulated signal by controlling the LED lamp installed at the vehicle in accordance with the signal modulated by the modulation unit; a receiving unit which is installed at the vehicle and receives the signal transmitted from the receiving unit of an adjacent vehicle; and a distortion prevention unit which is installed at the vehicle to remove debris or rainwater attached to the LED lamp or prevent the rainwater or the debris from being attached to the LED lamp so as to prevent the signal transmitted through the LED lamp from being distorted due to the debris or the rainwater attached to the LED lamp. Therefore, according to the communication system between vehicles based on a visible light communication of the present invention, the LED lamp installed at the vehicle is used and the CSK method is applied such that a larger quantity of correction information can be provided and distributed to other vehicles in a stable and efficient manner.

Description

Inter-vehicle communication system based on visible light communication}

The present invention relates to a system for inter-vehicle communication based on visible light communication, and more particularly, to a system for supporting inter-vehicle communication based on visible light communication using an LED lamp installed in a vehicle.

An important issue in the field of smart car technology is to provide traffic information collection and distribution stably and efficiently. The traffic information may include information related to a macroscopic traffic environment, such as traffic congestion or delay, a traffic accident, traffic speed, and vehicle information such as vehicle speed, destination, and travel route.

The traffic information provided to the vehicle was collected through a magnetic loop sensor installed on the road surface, a traffic information collection camera installed on the ground, and a location information module installed on the vehicle, and the collected basic data is provided to the traffic information management center through a wired or wireless communication network. Became. Such traffic information could be provided to a vehicle driving through an electronic signboard.

On the other hand, the provision of the traffic information as described above is a very basic level of information providing method, for the advanced function of an intelligent vehicle such as ADAS (Advanced Driver Assistance System) autonomous driving, the vehicle in motion actively collects traffic information and A method of controlling or providing a driving vehicle to directly provide driving information to a surrounding driving vehicle is required, which is limited by the existing centralized traffic information collection and distribution method. It is necessary to introduce a direct vehicle-to-vehicle communication method to support a more advanced intelligent vehicle driving system.

For communication between vehicles, it is required that a communication device according to a specific communication protocol is mounted. In order to be used for inter-vehicle communication, characteristics of a physical layer according to a corresponding communication protocol are considered, because communication coverage due to frequency characteristics or resistance to interference may be determined by characteristics of the physical layer. Among the currently used communication protocols, wireless local area networks can sufficiently cover the distance between vehicles in which the coverage is running. However, when the traffic of the vehicle is congested, the interference resistance is low, and the data transmission speed of wireless local area communication is greatly reduced. In addition, the wireless local area communication must have an additional communication facility, etc. in the vehicle, and there may be a problem in its applicability since a wireless medium access method other than the existing general wireless local area communication method needs to be defined.

Registered Patent Publication No. 10-1964175: Vehicle communication service provision method and vehicle communication service provision terminal

The present invention has been devised to improve the above problems, and an object thereof is to provide a visible light communication-based inter-vehicle communication system capable of transmitting traffic information to an adjacent vehicle using an LED lamp installed in the vehicle.

A vehicle-to-vehicle communication system based on visible light communication according to the present invention for achieving the above object is a vehicle-to-vehicle communication system based on an LED lamp installed in a driving vehicle, generating data generating a data frame including traffic information of the vehicle The control unit modulates the data frame generated by the data generation unit based on a CSK (Color Shift Keying) modulation technique, and adjusts the LED lamp installed in the vehicle according to a signal modulated by the modulation unit. The transmission unit for transmitting the modulated signal, the receiving unit is installed in the vehicle, receiving the signal transmitted from the receiving unit of the adjacent vehicle, and installed in the vehicle by the foreign matter or rainwater attached to the LED lamp In order to prevent the signal transmitted through the LED lamp from being distorted, a foreign matter or rainwater attached to the LED lamp is removed, or a distortion preventing unit for preventing rainwater or foreign matter from being attached to the LED lamp.

The modulator performs color mapping by color coding the data frame according to the CSK modulation technique, wherein the color mapping is based on the output powers of the R, G, and B LED light sources Pi, Pj, and Pk. The point (xp, yp) is determined by the intensity, and the relationship between the output intensity of the LED light source and the xy coordinate is determined by the following equation, and the receiving unit is configured according to the mapping state of the LED lamp. Adjust the R,G,B LED light source,

(Mathematics)

xp = Pi x xi + Pj x xj + Pk x xk

yp = Pi x yi + Pj x yj + Pk x yk

Pi + Pj + Pk = 1,

Here, points (xi, yi), (xj, yj), (xk, yk) are the xy coordinates of the R, G, and B LED light sources, and points (xp, yp) are symbols of the modulated signal through 4-CSK modulation. It is preferably coordinates.

The distortion preventing unit is installed on the vehicle surface on the upper and lower sides of the LED lamp to prevent rain or contaminants from adhering to the surface of the LED lamp, and includes a plurality of blocking plates protruding out of the vehicle. .

The anti-distortion unit may further include an anti-reflection member that is installed on opposite sides of the blocking plates to prevent reflection of light incident from the LED lamp.

The distortion prevention unit is installed on each of the blocking plates, a plurality of injection nozzles for injecting air toward the LED lamp, and an air supply unit installed in the injection nozzles to supply air to the injection nozzle, and to the transmission unit When the signal is transmitted through the LED lamp is provided with an injection control unit for controlling the air supply so that air is injected from the injection nozzle.

The distortion preventing unit includes at least one guide member for guiding a portion of air flowing rearward along the upper portion of the vehicle to flow toward the LED lamp when the vehicle is running, and the guide member has one end of the vehicle. It is installed on the top, the other end is installed on the surface of the vehicle in a position adjacent to the upper side of the LED lamp, there is provided a flow path through which air can flow, and air can be introduced into the flow path at one end. An inlet is formed so that an outlet may be formed at the other end so that air passing through the flow path can be discharged.

The distortion preventing unit is installed on the flow path of the guide member so that hot air is supplied to the LED lamp side to prevent ice from forming on the surface of the LED lamp, and a heating member for heating air passing through the flow path is provided. Have more.

The LED lamp is installed in a case installed in the vehicle, a main LED module installed in the case, and displaying a back signal of the vehicle, and the case in a position adjacent to the main LED module, by the modulator. In order to display the modulated signal, a sub-LED module that generates signal light to the outside under the control of the transmitting unit, and is installed on the optical axis of the signal light generated from the sub-LED module, the signal light is adjacent to the driver's field of view of the driver A lens module is provided to reduce the upper and lower widths of the irradiation range of the signal light to prevent the interference, and to expand the left and right widths of the irradiation range of the signal light to expand the receiveable range of the signal light.

The receiving unit, which is installed in the vehicle, receives the signal light irradiated from the LED lamp of an adjacent vehicle and a light receiving sensor provided with a receiving unit, and the data frame based on the signal light incident on the light receiving sensor It has an information providing unit for calculating, and an incident limiting unit installed in the light receiving sensor so as to limit the incidence range of the signal light incident on the receiving unit, and the incident limiting unit is installed in the light receiving sensor. A receiving space is provided so that the receiving part of the light receiving sensor can be drawn in, and on the side opposite to the receiving part, a main body having a receiving port is formed so that the signal light can be introduced into the receiving space, and the receiving port can be opened and closed. A plurality of opening and closing plates slidably installed in the left and right sides of the main body with respect to the center of the receiving port so as to be slidable in the left and right directions, and an opening and closing moving unit for moving the opening and closing plates so as to limit the incidence range of the signal light incident on the receiving unit And, when a plurality of signal light is received through the light receiving sensor, the opening and closing plates are adjacent to each other in order to reduce the opening range of the receiving port so as to selectively receive only the signal light provided from a vehicle adjacent to the front of the vehicle. And an opening/closing control unit for controlling the opening/closing moving unit so as to move in a direction.

The inter-vehicle communication system based on visible light communication according to the present invention uses the LED lamp installed in the vehicle, but has the advantage of being able to provide and distribute a larger amount of correction information to other vehicles stably and efficiently by applying the CSK method. .

1 is a conceptual diagram for a vehicle-to-vehicle communication system based on visible light communication according to the present invention;
2 is a block diagram of a visible light communication-based inter-vehicle communication system according to the present invention,
3 is a side view of the distortion preventing unit of the visible light communication based inter-vehicle communication system according to the present invention;
4 is a diagram illustrating constellation mapping of a modulation level 4-CSK modulation technique according to an embodiment of the present invention,
5 is a diagram showing constellation mapping of a modulation level 8-CSK modulation technique according to an embodiment of the present invention,
6 is a diagram illustrating constellation mapping of a modulation level 16-CSK modulation technique according to an embodiment of the present invention,
7 is a view showing an example of light mapping in modulation level 4-CSK modulation according to an embodiment of the present invention,
8 is a side view of a distortion preventing unit according to another embodiment of the present invention,
9 is a side view of a distortion preventing unit according to another embodiment of the present invention,
10 is a side view of a distortion preventing unit according to another embodiment of the present invention,
11 is a cross-sectional view of a distortion preventing unit according to another embodiment of the present invention,
12 is a cross-sectional view of an inter-vehicle communication system based on visible light communication according to another embodiment of the present invention,
13 is a partially cut-away perspective view of an incidence limit unit of a visible light communication based inter-vehicle communication system according to another embodiment of the present invention.

Hereinafter, a vehicle-to-vehicle communication system based on visible light communication according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The present invention can be applied to various changes and may have various forms, and specific embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to specific disclosure forms, and it should be understood that all modifications, equivalents, and substitutes included in the spirit and scope of the present invention are included. In describing each drawing, similar reference numerals are used for similar components. In the accompanying drawings, the dimensions of the structures are shown to be enlarged than actual in order to clarify the present invention.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from other components. For example, the first component may be referred to as a second component without departing from the scope of the present invention, and similarly, the second component may be referred to as a first component.

Terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprises" or "have" are intended to indicate the presence of features, numbers, steps, actions, elements, parts or combinations thereof described in the specification, one or more other features. It should be understood that the existence or addition possibilities of fields or numbers, steps, actions, components, parts or combinations thereof are not excluded in advance.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person skilled in the art to which the present invention pertains. Terms, such as those defined in a commonly used dictionary, should be interpreted as having meanings consistent with meanings in the context of related technologies, and should not be interpreted as ideal or excessively formal meanings unless explicitly defined in the present application. Does not.

1 is a conceptual diagram of a visible light communication-based inter-vehicle communication system 100 according to an embodiment of the present invention.

Referring to the drawings, the visible light communication-based inter-vehicle communication system 100 of the present invention may be installed in a preceding vehicle and a trailing vehicle while driving. The preceding vehicle may transmit surrounding traffic information including the host vehicle to the following vehicle, and the following vehicle may also transmit traffic situation information including vehicle driving information to the preceding vehicle and the following vehicle of the following vehicle. The preceding vehicle and the following vehicle may use the LED lamp-based headlights and tail lights, which are provided by themselves, to transmit traffic information, and separately installed communication LED lighting transmission and reception modules.

2 to 7 show a vehicle-to-vehicle communication system 100 based on visible light communication according to the present invention.

Referring to the drawings, the visible light communication-based inter-vehicle communication system 100 includes the traffic information of the vehicle 11 in the inter-vehicle communication system 100 based on the LED lamp installed in the driving vehicle 11. Data generation unit 110 for generating a data frame including, a modulation unit 120 for modulating the data frame generated by the data generation unit 110 based on a CSK (Color Shift Keying) modulation technique, and the modulation Transmission unit 130 for transmitting the modulated signal by adjusting the LED lamp 15 installed in the vehicle 11 according to the signal modulated by the unit 120, and is installed in the vehicle 11, adjacent A receiving unit (not shown) that receives a signal transmitted from the receiving unit of the vehicle 11 and provides traffic information included in the data frame to the driver of the vehicle 11, and is installed in the vehicle 11 In order to prevent the signal transmitted through the LED lamp 15 from being distorted by foreign matter or rainwater attached to the LED lamp 15, the foreign matter or rainwater attached to the LED lamp 15 is removed or rainwater or foreign matter is removed. It is provided with a distortion preventing unit 150 to prevent it from being attached to the LED lamp 15.

The data generation unit 110 may generate a data frame including vehicle driving and surrounding traffic information to be transmitted, and may generate a frame header including control information necessary to interpret the data frame in the receiving unit. The frame header may include a modulation scheme field indicating a modulation scheme of a data frame and a length field indicating a length of a data frame. Here, it is called a data unit including a frame header and a data frame. The data unit may be generated as a bit sequence. In the data unit, the frame header may be implemented so that it is located at the front end of the data frame and first received by the receiving unit.

At this time, the data generating unit 110 may be connected to On Board Diagnostics (OBD) of the vehicle 11 to obtain vehicle driving information. The OBD (On Board Diagnostics) is a vehicle 11 internal sensor provided in advance in the vehicle 11, for example, through a speed sensor, an acceleration sensor, a door opening/closing sensor, a sudden stop detection sensor, a brake pedal operation detection sensor, etc. Not only does it detect all the driving information in the vehicle 11, including the deceleration and deceleration of the vehicle 11, but also the driving time, driving distance, accident detection, time and distance during a certain driving period, whether rapid acceleration and sudden braking, etc. It is a device that can collect information of safety equipment such as coolant, coolant, brake oil, engine oil, engine RPM, vibration, sound, tire pressure, vehicle acceleration, deceleration, average speed, ABS and airbag, battery voltage, etc. Can.

In addition, the data generating unit 110 is connected to a management server of a traffic management institution that stores traffic information including traffic signals, and collects traffic information around the vehicle including traffic signals. The traffic signal includes a time point for changing the traffic signal, the type of traffic signal currently displayed, and the like.

The modulator 120 includes a scrambler 121, a channel coding module 122, a modulator 123, and a DAC 124.

The scrambler 121 may scramble the bit sequence of the data unit generated by the data generator 110. Scrambling may be used to ensure encryption of a bit sequence, prevention of bit blocks having repetitive patterns, and prevention of continuity of bit values. Here, the scrambler 121 is not shown in the drawing, but may include 15 retarders (D) and 2 summers. Through this, the generation polynomial g(D) of the scrambler is as shown in Equation 1 below.

Here, D is a single bit delay element.

The channel encoding module 122 encodes a bit sequence scrambled by the scrambler 121. Channel coding enables the receiving side to detect and correct errors during transmission of information through a channel, overcomes noise, interference, and fading on the channel, improves performance, and differs in symbolizing bit sequences. It can be performed to stand out by preventing the mistaken by the receiving end. Here, the encoding is a Forward Error Correction (FEC) method, and a Reed Solomon (64, 32) method may be applied.

The modulator 123 modulates the bit sequence encoded by the channel encoder based on a color shift keying (CSK) modulation technique, and includes a coding unit 125 and a mapping unit 126.

The coding unit 125 maps the bit sequence encoded by the channel coding module 122 to an x, y color coordinate system according to a specific constellation mapping technique. Here, the constellation mapping technique may be different depending on the CSK modulation level implemented by the modulator 123. In an embodiment of the present invention, the CSK modulation level may be one of 4, 8 and 16.

4 is a diagram showing a constellation mapping of a modulation level 4-CSK modulation technique according to an embodiment of the present invention.

Referring to the drawings, points I, J, and K indicate the position of each center wavelength of the LED lamp 15 used for CSK-based communication. P0 to P3 represent each symbol in the 4-level CSK. Symbols P1, P2 and P3 correspond to each vertex of the I-J-K triangle. The symbol P0 may be the center point of the I-J-K triangle. Therefore, 2 bits are mapped to one symbol when the 4-level CSK modulation technique is applied.

5 is a diagram showing a constellation mapping of a modulation level 8-CSK modulator 123 method according to an embodiment of the present invention.

Referring to the drawings, points I, J, and K indicate the position of each central wavelength of the LED lamp 15 used for CSK-based communication. S0 to S7 represent eight symbols used for modulation level 8-CSK. The symbols S0, S4 and S7 correspond to each vertex of the I-J-K triangle. The symbols S1 and S2 are the points dividing the line JK and line JI in a ratio of 1:2. Points B and C are the central points of Sun JI and JK. The symbol S6 is the center point of the line KI. Point A is the center point of the B-S6-I triangle. Point D is the center point of the C-K-S6 triangle. Symbol S3 is a point dividing line AB at a ratio of 1:2, and symbol S5 is a point dividing line DC at a ratio of 1:2. Therefore, 3 bits are mapped to one symbol when the level 8-CSK modulation technique is applied.

6 is a diagram showing a constellation mapping of a modulation level 16-CSK modulation technique according to an embodiment of the present invention.

Referring to the drawings, points I, J, and K indicate the position of each central wavelength of the LED lamp 15 used for CSK-based communication. P0 to P15 mean 16 symbols used for modulation level 16-CSK. Symbols P5, P10 and P15 correspond to each vertex of the I-J-K triangle. Symbols P2 and P8 are points where the line JK is divided by a ratio of 1:3. The symbols P3 and P12 are points where the line JI is divided by a ratio of 1:3. Symbols P11 and P14 are points where line KI is divided by a ratio of 1:3. The symbol P0 is the zoom center point of the I-J-K triangle. The symbols P1, P4, P6, P7, P9 and P13 are the center points of each small triangle. Therefore, 4 bits are mapped to one symbol when the modulation level 16-CSK modulation technique is applied.

The mapping unit 126 determines light source control information based on the xy coordinates of symbols mapped through the coding unit 125. The light source control information is output power related information for adjusting the intensity of the R, G, and B LED light sources constituting the LED lamp 15.

The function of the mapping unit 126 is described in detail with reference to FIG. 7. 7 is a diagram illustrating an example of light mapping in modulation level 4-CSK modulation according to an embodiment of the present invention.

Referring to the drawings, points (xi, yi), (xj, yj), and (xk, yk) represent the xy coordinates of the R, G, and B LED light sources of the LED lamp 15. Points (xp, yp) correspond to coordinates of symbols modulated through modulation level 4-CSK modulation. In FIG. 10, points (xp, yp) are determined by the intensity of the output powers of each of the R, G, and B LED light sources, Pi, Pj, and Pk. The relationship between the output power intensity of each LED light source and the xy coordinates can be defined by Equation 2 below.

The output power signals determined by the mapping unit 126 are transmitted to the transmitting unit 130 through the DACs 124, Pi, Pj, and Pk. At this time, a channel estimation sequence may be applied to compensate for aging and performance degradation of the LED light source of the LED light source 15 before the output power signal provided from the mapping unit is provided to the transmission unit 130.

The transmitting unit 130 outputs light from the LED light source of the LED lamp 15 according to the output power signal transmitted through the DAC 124.

On the other hand, when receiving traffic information provided in the form of visible light through the LED lamp 15 in the receiving unit of another vehicle, performance deterioration may occur due to a special feature of visible light. For example, multi-color imbalance, multi-color interference, interference from other lights, and the like may cause communication interference between vehicles. This phenomenon may be more prominent in visible light communication between vehicles in which speed and direction are continuously changed than visible light communication with two stationary communication equipment. Therefore, simply increasing the throughput by applying a higher level CSK modulation technique is a factor that decreases efficiency in terms of reliability of the communication method. Therefore, in transmitting the data unit, the frame header including the control information and the CSK level applied to the data frame including the actual traffic information can be set differently.

Since reception of control information needs to maintain higher reliability, a low level CSK modulation technique can be applied. For example, it may be transmitted by applying the lowest level 4-CSK modulation. On the other hand, the data frame may apply a modulation scheme having a level equal to or higher than the CSK level applied to the frame header. As described above, although different levels of modulation schemes are applied to the header and the data frame, a modulation method field of the frame header may be required to allow the receiving end to demodulate data normally.

Additionally, the frame header is based on the application of a fixed, lowest level 4-CSK modulation technique, but the CSK modulation level applied to the data frame depends on the driving environment of the vehicle 11 equipped with the transmitting unit 130. It can be set variably. For example, in the case of the vehicle 11 running at a low speed on a road with traffic congestion, since the amount of traffic information provided in the surroundings may be relatively large, it is necessary to increase the data throughput. In addition, in the case of the vehicle 11 running at a low speed, since the influence of a factor deteriorating visible light communication performance such as interference is relatively low, reliability can be maintained to some extent even when a higher level CSK modulation technique is used. Conversely, in a high-speed driving environment, since other vehicles are relatively less distributed around the vehicle 11 being driven, the amount of traffic information to be transmitted is relatively small, which is insufficient for the transmission of information even with a somewhat low throughput transmission method. There may not be. On the other hand, since high-speed driving can cause more degradation of the performance of visible light communication, a low level CSK modulation technique may be used in terms of reliability.

The receiving unit is installed at the front or rear of the vehicle 11 so as to receive a signal for a data frame transmitted through the LED lamp 15. The receiving unit is installed on the vehicle 11, the light receiving sensor provided with a receiving unit so as to receive the signal light irradiated from the LED lamp 15 of the adjacent vehicle 11, and incident on the light receiving sensor And an information providing unit that calculates the data frame based on the signal light and provides the calculated data frame to the driver of the vehicle 11.

Although the light receiving sensor is not shown in the drawing, a plurality of sensors are installed at the front and rear of the vehicle 11, respectively, to receive signal light transmitted through the LED lamp 15 of the other vehicle 11. Since the light receiving sensor is a light sensing means generally used in the prior art to receive light, detailed description is abundant.

Although the information providing unit is not illustrated in the drawing, a calculation module for calculating a data unit from signal light received from the light receiving sensor and calculating driving information or traffic information of the vehicle 11 included in the calculated data unit, and the calculation It has a display module for displaying the information calculated by the module. Here, the display module is installed inside the vehicle 11 to display the corresponding information to the driver or passenger of the vehicle 11. In addition, in the case of the autonomous vehicle 11, the calculation module provides the calculated information to a control module that controls autonomous driving of the vehicle 11.

On the other hand, the distortion prevention unit 150 is installed on each surface of the vehicle 11 above and below the LED lamp 15 to prevent rainwater from forming on the surface of the LED lamp 15 or foreign matter from being attached, and the The vehicle 11 includes a plurality of blocking plates 151 protruding from the outside.

The blocking plate 151 is installed on the surface of the vehicle 11 above and below the LED lamp 15 and extends a predetermined length in a direction away from the vehicle 11. At this time, the blocking plate 151 is preferably extended in the left and right directions to a length corresponding to the left and right widths of the LED lamp 15. The blocking plate 151 prevents foreign matter or rainwater from coming into contact with the LED lamp 15 so that the signal transmitted through the LED lamp 15 is distorted by foreign matter or rainwater attached to the LED lamp 15. Is prevented.

The visible light communication-based inter-vehicle communication system 100 according to the present invention configured as described above uses the LED lamp 15 installed in the vehicle 11, but the CSK method is applied to stably and efficiently correct a large amount of correction information. It has the advantage that it can be provided and distributed to other vehicles (11).

Meanwhile, FIG. 8 illustrates a distortion prevention unit 210 according to another embodiment of the present invention.

Elements having the same function as in the above-described drawings are denoted by the same reference numerals.

Referring to the drawings, the anti-distortion unit 210 is installed on each of opposite sides of the blocking plates 151, and further includes an anti-reflection member 211 preventing reflection of light incident from the LED lamp 15. To be equipped.

The anti-reflection member 211 is formed to cover the side surface of the blocking plate 151 to prevent reflection of light incident on the blocking plate 151 among the light generated by the LED lamp 15, so the LED lamp ( 15) to prevent the signal transmitted through the distortion.

Meanwhile, FIG. 9 illustrates a distortion prevention unit 220 according to another embodiment of the present invention.

Referring to the drawings, the distortion prevention unit 220 is installed on each of the blocking plates 151, a plurality of injection nozzles 221 for spraying air toward the LED lamp 15, and the injection nozzle 221 It is installed in the air supply unit 222 for supplying air to the injection nozzle 221, and when the signal is transmitted through the LED lamp 15 by the transmission unit 130, the air from the injection nozzle 221 It is provided with an injection control unit 223 to control the air supply unit 222 so that the injection.

A plurality of the injection nozzles 221 are respectively installed on the blocking plate 151 to inject air. At this time, among the blocking plates 151, the injection nozzle 221 installed on the blocking plate 151 located on the upper side injects air downward, and the injection nozzle 221 installed on the blocking plate 151 located on the lower side is directed upward. It is preferably installed to inject air.

The air supply unit 222 includes an air supply pipe 224 connected to the injection nozzles 221 and a compressor 225 installed in the air supply pipe 224 to supply high pressure air. The compressor 225 is preferably installed inside the vehicle 11, that is, in the trunk.

The injection control unit 223 is connected to the transmission unit 130 of the air supply unit 222 so that air is injected from the injection nozzle 221 when a signal is transmitted through the LED lamp 15 by the transmission unit 130 The compressor 225 is controlled.

The distortion preventing unit 220 may remove foreign matter or rainwater attached to the surface of the LED lamp 15 by air injected from the spray nozzle 221, and form an air film on the surface of the LED lamp 15. Rainwater or foreign matter may be prevented from contacting the surface of the LED lamp 15.

Meanwhile, FIG. 10 illustrates a distortion prevention unit 230 according to another embodiment of the present invention.

Referring to the drawings, the distortion preventing unit 230 is a guide for guiding a portion of the air flowing backward along the upper portion of the vehicle 11 to flow toward the LED lamp 15 when the vehicle 11 is traveling A member 231 is provided.

The guide member 231 is formed to be bent downward so that the front end portion is fixed to the upper portion of the vehicle 11, and the rear end portion is installed on the surface of the vehicle 11, that is, on the side of the vehicle 11 above the LED lamp 15. . The guide member 231 is provided with a flow path 232 through which air can flow, and an inlet 233 is formed to allow air to flow into the flow path 232 at the front end, and flow at the bottom. An outlet 234 is formed so that air passing through the furnace 232 can be discharged.

On the other hand, in the illustrated example, although the structure in which the guide member 231 is installed on the LED lamp 15 side installed at the rear of the vehicle 11 is shown, the guide member 231 is not limited thereto, and the vehicle 11 It may be installed on the LED lamp 15 side installed in front of.

When the vehicle 11 travels, some of the air that flows backward along the upper portion of the vehicle 11 is guided by the guide member 231 and flows toward the LED lamp 15 side, which is caused by the air flow. Foreign matter or rainwater attached to the surface may be removed, and an air film may be formed on the surface of the LED lamp 15 to prevent rainwater or foreign matter from contacting the surface of the LED lamp 15.

Meanwhile, FIG. 11 illustrates a distortion prevention unit 240 according to another embodiment of the present invention.

Referring to the drawings, the distortion preventing unit 240 is a flow path of the guide member 231 so that hot air is supplied to the LED lamp 15 side to prevent ice from being formed on the surface of the LED lamp 15 A heating member 241 installed on the 232 to heat the air passing through the flow path 232 is further provided.

The heating member 241 is applied with an electric heating wire generated by the supplied electricity, is installed inside the guide member 231 and passes through the flow path 232 to heat the air injected to the LED lamp 15 side.

Since the air heated by the heating member 241 is supplied to the LED lamp 15 side, ice is prevented from being generated in the LED lamp 15, so that the signal transmitted through the LED lamp 15 is distorted by the ice. Can be prevented.

Meanwhile, FIG. 12 illustrates a vehicle-to-vehicle communication system 300 based on visible light communication according to another embodiment of the present invention.

Referring to the drawing, the LED lamp 310 is a case 311 installed in the vehicle 11 and a main LED module 312 installed in the case 311 and displaying an equal signal of the vehicle 11 ), and is installed in the case 311 in a position adjacent to the main LED module 312, and externally controlled by the transmitting unit 130 to display a signal modulated by the modulator 120. It has a sub-LED module 313 for generating a low signal light.

The case 311 is installed at the rear or front of the vehicle 11, and is formed of a light-transmitting material so that light can be irradiated to the outside. In addition, the case 311 is provided with an internal space in which the main LED module 312 and the sub LED module 313 are installed.

The main LED module 312 is installed inside the case 311, and although not shown in the drawings, R, G, and B LED light sources are provided. The main LED module 312 irradiates light according to the back signal input from the vehicle 11. That is, the main LED module 312 displays a headlight signal, a brake light signal, and the like.

The sub LED module 313 is installed inside the case 311, and although not shown in the drawing, R, G, and B LED light sources are provided in the transmitting unit 130 to generate signal light under control.

Meanwhile, the visible light communication-based inter-vehicle communication system 300 is installed on the optical axis of the signal light generated by the sub-LED module 313, and prevents the signal light from interfering with the driver's field of view of the adjacent vehicle 11 In order to reduce the upper and lower widths of the irradiation range of the signal light, the lens module 320 is provided to expand the left and right widths of the irradiation range of the signal light in order to expand the reception range of the signal light.

Although the lens module 320 is not shown in the drawing, it is installed on the optical axis of the signal light generated by the sub-LED module 313 and reduces the upper and lower widths of the signal light irradiation range, and is based on the signal light irradiation direction. As it is installed on the rear side of the thumbnail is provided with an expansion lens to expand the left and right width of the signal light irradiation range.

Although the thumbnail is not shown in the drawing, it is formed of a light-impermeable material, and a passage is formed so that signal light generated by the sub-LED module 313 passes. At this time, it is preferable that the through-hole is formed to have a smaller vertical width than a horizontal width.

On the other hand, the lens module 320 is not limited to the above-described examples, but is not limited to the above, but the irradiation range of the signal light is reduced by the upper and lower widths, and any lens means capable of extending the left and right widths is possible.

As described above, the lens module 320 reduces the upper and lower widths of the irradiation range of the signal light emitted from the sub-LED module 313, so that the signal light can be prevented from interfering with the driver's field of view of the adjacent vehicle 11, In addition, since the left and right widths of the irradiation range of the signal light emitted from the sub-LED module 313 are extended by the lens module 320, the receiving unit of more vehicles 11 can receive the signal light.

Meanwhile, FIG. 13 shows a receiving unit 330 according to another embodiment of the present invention.

Referring to the drawing, the receiving unit 330 is an incident range of the signal light incident on the receiver 341 of the light receiving sensor capable of receiving the signal light irradiated from the LED lamp 310 of the adjacent vehicle 11 In order to limit it, an incident limiting unit 350 installed in the light receiving sensor is further provided.

The incident limiting part 350 is installed on the light receiving sensor, and an inlet space 354 is provided to allow the receiving part 341 of the light receiving sensor to be introduced therein, which is opposite to the receiving part 341. On the side, the main body 351 having a receiving opening 355 to allow the signal light to enter the receiving space 354 and the center of the receiving opening 355 to open and close the receiving opening 355 A plurality of opening and closing plates 352 slidably installed in the left and right sides of the main body 351 as a reference, and the opening and closing plates 352 so as to limit an incident range of the signal light incident on the receiver 341 When opening and closing the moving unit 353 and a plurality of signal light is received through the light receiving sensor, it is possible to selectively receive only the signal light provided from the vehicle 11 adjacent to the front of the vehicle 11 In order to reduce the opening range of the receiving port 355, an opening/closing control unit (not shown) for controlling the opening/closing moving unit 353 is provided so that the opening/closing plates 352 move in mutually adjacent directions.

The body 351 is formed of a light-impermeable material, and the receiving port 355 is formed on the front surface. The receiving hole 355 is formed in a square shape, but is not limited thereto, and may be formed in various shapes such as a circular shape or an oval shape.

The opening and closing plate is formed in a plate shape having a predetermined thickness, and is formed to have a larger vertical width than the vertical width of the receiving port 355. The opening and closing plates are slidably installed in the left and right directions at positions spaced apart from each other in the left and right directions based on the center of the receiving port 355. At this time, the opening and closing plate is preferably formed of a light-impermeable material.

Although the opening/closing moving part 353 is not shown in the drawing, it is installed at the bottom of the rear of the opening and closing plates and extends in the left and right directions, and a plurality of rack gears provided with a plurality of gear teeth, and the main body to be meshed with the rack gears (351) a plurality of pinion gears rotatably installed therein, and a plurality of rotation motors respectively installed on the pinion gears to rotate the pinion gears to move the opening/closing plate. Meanwhile, the opening/closing moving part 353 is not limited to this, and any driving means capable of moving the opening/closing plates is possible.

The opening/closing control unit controls the opening/closing moving unit 353, and is connected to the light receiving sensor to receive a plurality of signal lights from the light receiving sensor, to reduce the opening range of the receiving port 355, the opening/closing plate ( The rotating motors of the opening/closing moving part 353 are controlled so that the 352) are moved in directions adjacent to each other.

When a plurality of signal lights are received through the light receiving sensor by the incidence limiter 350, the left and right lanes of the vehicle 11 are reduced because the left and right widths of the open range of the receiving port 355 of the main body 351 are reduced ( Since the signal lights generated from 11) are prevented from flowing into the main body 351, the reception rate of the signal lights can be improved by receiving only the signal lights of the preceding vehicle 11 located in the same lane as the corresponding vehicle 11.

The description of the presented embodiments is provided to enable any person of ordinary skill in the art to use or practice the present invention. Various modifications to these embodiments will be apparent to those skilled in the art of the present invention, and the general principles defined herein can be applied to other embodiments without departing from the scope of the present invention. Thus, the present invention should not be limited to the embodiments presented herein, but should be interpreted in the broadest scope consistent with the principles and novel features presented herein.

100: visible light communication based vehicle-to-vehicle communication system
110: data generation unit
120: modulator
121: scrambler
122: channel coding module
123: modulator
124: DAC
125: coding unit
126: mapping unit
130: transmitting unit
150: distortion prevention unit
151: blocking plate

Claims (9)

In the vehicle-to-vehicle communication system based on the LED lamp installed in the vehicle in driving,
A data generation unit generating a data frame including traffic information of the vehicle;
A modulator for modulating the data frame generated by the data generator based on a color shift keying (CSK) modulation technique;
A transmission unit that transmits the modulated signal by adjusting the LED lamp installed in the vehicle according to the signal modulated by the modulator;
A receiving unit installed in the vehicle and receiving a signal transmitted from a receiving unit of an adjacent vehicle; And
Remove the foreign matter or rainwater attached to the LED lamp to prevent the signal transmitted through the LED lamp from being distorted by foreign matter or rainwater attached to the LED lamp installed in the vehicle, or rainwater or foreign matter is the LED lamp It is provided with a distortion preventing unit to prevent being attached to,
The distortion preventing unit is installed on each surface of the vehicle above and below the LED lamp to prevent rain or contaminants from adhering to the surface of the LED lamp, and a plurality of blocking plates protruding outside the vehicle;
A plurality of injection nozzles respectively installed on the blocking plates to inject air toward the LED lamp;
An air supply unit installed in the injection nozzles to supply air to the injection nozzles; And
The injection unit controls the air supply unit so that air is injected from the injection nozzle when a signal is transmitted through the LED lamp by the transmission unit.
Vehicle-to-vehicle communication system based on visible light communication.
According to claim 1,
The modulator performs color mapping by color coding the data frame according to the CSK modulation technique, wherein the color mapping is based on the output powers of the R, G, and B LED light sources Pi, Pj, and Pk. The point (xp, yp) is determined by the intensity, and the relationship between the output intensity of the LED light source and the xy coordinate is determined by the following equation,
The receiving unit adjusts the R, G, and B LED light sources of the LED lamp according to the mapping state,
(Mathematics)
xp = Pi x xi + Pj x xj + Pk x xk
yp = Pi x yi + Pj x yj + Pk x yk
Pi + Pj + Pk = 1,
Here, points (xi, yi), (xj, yj), (xk, yk) are the xy coordinates of the R, G, and B LED light sources, and points (xp, yp) are symbols of the modulated signal through 4-CSK modulation. Coordinate,
Vehicle-to-vehicle communication system based on visible light communication.
delete According to claim 1,
The anti-distortion unit is further provided on each of opposite sides of the blocking plates to prevent reflection of light incident from the LED lamp;
Vehicle-to-vehicle communication system based on visible light communication.
delete In the vehicle-to-vehicle communication system based on the LED lamp installed in the vehicle in driving,
A data generation unit generating a data frame including traffic information of the vehicle;
A modulator for modulating the data frame generated by the data generator based on a color shift keying (CSK) modulation technique;
A transmission unit that transmits the modulated signal by adjusting the LED lamp installed in the vehicle according to the signal modulated by the modulator;
A receiving unit installed in the vehicle and receiving a signal transmitted from a receiving unit of an adjacent vehicle; And
Remove the foreign matter or rainwater attached to the LED lamp to prevent the signal transmitted through the LED lamp from being distorted by foreign matter or rainwater attached to the LED lamp installed in the vehicle, or rainwater or foreign matter is the LED lamp It is provided with a distortion preventing unit to prevent being attached to,
The distortion preventing unit includes at least one guide member that guides a part of the air flowing backward along the upper portion of the vehicle to flow toward the LED lamp when the vehicle is traveling,
The guide member, one end is installed on the upper portion of the vehicle, the other end is installed on the surface of the vehicle in a position adjacent to the upper side of the LED lamp, a flow path through which air can flow inside is provided, and at one end An inlet is formed to allow air to flow into the flow path, and an outlet is formed to allow air passing through the flow path to be discharged at the other end.
Vehicle-to-vehicle communication system based on visible light communication.
The method of claim 6,
The distortion preventing unit is installed on the flow path of the guide member so that hot air is supplied to the LED lamp side to prevent ice from being formed on the surface of the LED lamp, a heating member for heating air passing through the flow path; Further comprising,
Vehicle-to-vehicle communication system based on visible light communication.
In the vehicle-to-vehicle communication system based on the LED lamp installed in the vehicle in driving,
A data generation unit generating a data frame including traffic information of the vehicle;
A modulator for modulating the data frame generated by the data generator based on a color shift keying (CSK) modulation technique;
A transmission unit that transmits the modulated signal by adjusting the LED lamp installed in the vehicle according to the signal modulated by the modulator;
A receiving unit installed in the vehicle and receiving a signal transmitted from a receiving unit of an adjacent vehicle; And
Remove the foreign matter or rainwater attached to the LED lamp to prevent the signal transmitted through the LED lamp from being distorted by foreign matter or rainwater attached to the LED lamp installed in the vehicle, or rainwater or foreign matter is the LED lamp It is provided with a distortion preventing unit to prevent being attached to,
The LED lamp
A case installed in the vehicle;
A main LED module installed in the case and displaying a back signal of the vehicle;
A sub-LED module installed in the case adjacent to the main LED module and generating signal light to the outside under control of the transmitting unit to display a signal modulated by the modulator; And
It is installed on the optical axis of the signal light generated by the sub-LED module, to reduce the upper and lower width of the irradiation range of the signal light to prevent the signal light from interfering with the driver's field of view of the adjacent vehicle, the receiving range of the signal light In order to expand the left and right widths of the irradiation range of the signal light, a lens module to expand;
Vehicle-to-vehicle communication system based on visible light communication.
The method of claim 8,
The receiving unit
It is installed in the vehicle, the light receiving sensor provided with a receiving unit to receive the signal light irradiated from the LED lamp of the adjacent vehicle;
An information providing unit calculating the data frame based on the signal light incident on the light receiving sensor; And
It is provided with; an incidence limiter installed in the light receiving sensor so as to limit the incidence range of the signal light incident on the receiver;
The entrance limit is
As being installed in the light receiving sensor, an inlet space is provided so that the receiving part of the light receiving sensor can be introduced therein, and on a side opposite to the receiving part, a receiving hole is provided so that the signal light can be introduced into the inlet space. Formed body;
A plurality of opening/closing plates slidably installed in the left and right sides of the main body relative to the center of the receiving port so as to open and close the receiving port;
An opening/closing moving unit for moving the opening/closing plate to limit an incident range of the signal light incident on the receiving unit; And
When a plurality of signal lights are received through the light receiving sensor, the opening and closing plates are adjacent to each other in order to reduce the opening range of the receiving port so as to selectively receive only signal lights provided from vehicles adjacent to the front of the vehicle. Equipped with; opening and closing control unit for controlling the opening and closing moving unit to move to,
Vehicle-to-vehicle communication system based on visible light communication.

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