KR20120114658A - Data signal interleaving system and method thereof using by pma - Google Patents

Abstract

PURPOSE: A data signal interleaving system and method using pulse amplitude modulation are provided to improve the brightness of lighting by maintaining a duty ratio constantly. CONSTITUTION: A dimming signal setting unit(10) sets a period, an amplitude and a duty ratio of lighting. A dimming signal generator(30) generates an outputted signal from the dimming signal setting unit. A data signal setting unit(20) sets a data signal to be transmitted. A data signal generator(40) generates the data signal. A data and dimming signal composing unit(50) generates a modulation signal by composing the data signal. [Reference numerals] (10) Dimming signal setting unit; (20) Data signal setting unit; (30) Dimming signal generator; (40) Data signal generator; (50) Data and dimming signal composing unit

Description

Data signal interleaving system and method using pulse amplitude modulation {DATA SIGNAL INTERLEAVING SYSTEM AND METHOD THEREOF USING BY PMA}

The present invention relates to a data signal interleaving system and a method thereof, and more particularly, to a data signal interleaving system and a data signal interleaving method using pulse amplitude modulation.

Recently, with the development of wireless personal area network (WPAN), a smart environment has been created to create various services and added value. Services and related devices and equipment are being used in various fields such as homes, offices and factories.

Lighting has been used mainly for illuminating dark places until recently, but with the advent of high-tech parts and materials such as LED lighting, intelligent lighting systems that can perform additional service functions as well as the original functions of lighting are attracting attention.

Conventional RF-based wireless communication technologies, such as RFID (Radio Frequency Identification), Home RF, WiFi, etc. are mainly used, which is a technology that can recognize information from a long distance using RF radio waves. This is a communication technology based on RF propagation. Because RF propagation signal is well absorbed by metal, its use is very limited in manufacturing environments producing metal structures or metal products. In other words, since metal structures and metal products absorb electromagnetic signals, and large-scale manufacturing plants use high current and high voltage, strong electromagnetic waves are generated and distortion of RF signals cannot be avoided. To this end, the development of more reliable communication technology is required.

Since then, optical communication technology using light has attracted attention, mainly wired communication technology using optical cables. Recently, research on visible light communication (VLC) technology incorporating such optical communication technology into wireless communication is being actively conducted. The visible light wireless communication technology may be called a communication technology using light that can output visible light such as LED and LD.

In other words, this is to transfer data to an optical component capable of outputting visible light such as LED or LD. Therefore, efforts are underway to develop various application fields such as indoor lights, traffic lights, street lights, vehicle headlights, and taillights using visible light.

Modulation techniques are necessary to convert electrical signals into optical signals.Pulse amplitude modulation (PAM), which carries a signal on the amplitude of pulses, and on-off keying (OOK: on), which transmits signals with or without pulses. Off keying), pulse position modulation (PPM) and pulse width modulation (PWM) methods that transmit signals using the position of the pulse are typical examples.

The pulse width modulation method is a method of adjusting the on / off ratio of the signal, the brightness is adjusted according to the time the LED is turned on, the longer the time the LED is turned on, the brighter the light is emitted The shorter it is, the darker it is.

7A, 7B and 7C are signal waveform diagrams according to a general pulse amplitude modulation scheme, and show signal waveform diagrams having the same period P and having different amplitudes. According to the pulse amplitude modulation method, different data signals can be transmitted depending on the amplitude of the pulse.

FIG. 8 is a signal waveform diagram illustrating dimming according to a general pulse width modulation scheme. Referring to FIG. 8, the lighting time in unit cycles having a constant amplitude and a constant pulse period P is measured. The signal is transmitted by differentiating W2 and W3).

FIG. 8A illustrates a case where the duty ratio is 75% and is turned on for 3/4 hours of the period during the period P. FIG. FIG. 8B illustrates a case where the duty ratio is 50%, and FIG. 8C illustrates a case where the duty ratio is 25%.

In Fig. 8, although the duty ratio is different, but the transmitted signals all show "1111", the brightness of the illumination is all different.

As described above, the method of transmitting data by changing the duty ratio is different depending on the data to be transmitted. However, the smaller the duty ratio, the darker the problem. In other words, it affects the change in color coordinates according to the data, resulting in a change in brightness.

When the lighting function is not important, there is a method of transmitting and receiving only data regardless of brightness, for example, a direct modulation method. This is shown in FIG.

9 illustrates a signal waveform diagram of a data signal modulation method of a direct modulation method. According to FIG. 9, an illumination brightness is continuously changed according to data to be transmitted / received irrespective of the brightness of an illumination and a color coordinate value is continuously changed. According to this method, data signals can be transmitted, but since the brightness of the light continuously changes randomly, it is difficult to use in a space where color temperature is important, such as a large plant and a manufacturing site of a company.

Embodiments of the present invention seek to provide an interleaving system and method for synthesizing data signals by pulse amplitude modulation using illumination.

Embodiments of the present invention seek to provide a data signal interleaving system and method for reducing color coordinate changes in accordance with data.

In addition, embodiments of the present invention to provide a data signal modulation scheme that can faithfully perform the dimming function of the illumination.

In one or more embodiments of the present invention, there is provided a data signal interleaving system using illumination, comprising: a dimming signal setting unit configured to set a period, an amplitude, and a duty ratio of the illumination; A dimming signal generator for inputting a signal output from the dimming signal setting unit to generate a dimming signal; A data signal setting unit for setting a data signal to be transmitted; A data signal generator for inputting a signal output from the data signal setting unit to generate a data signal; A data and dimming signal synthesizer configured to synthesize a dimming signal output from the dimming signal generator and a data signal output from the data signal generator to generate a modulated signal; A data signal interleaving system using pulse amplitude modulation may be provided.

In one or more embodiments of the present invention, the synthesis of the dimming signal and the data signal may utilize pulse amplitude modulation, wherein the data signal is interleaved with the dimming signal when the illumination is off.

In one or more embodiments of the present invention, the data signal may be set to match the dimming signal output from the dimming signal setting unit.

In one or more embodiments of the present invention, the combining of the dimming signal and the data signal may be performed at a constant duty ratio.

In one or more embodiments of the present invention, the synthesis of the data signal and the dimming signal may use a current lower than the current required for the dimming signal transmission.

In one or more embodiments of the present invention, there is provided a data signal interleaving method using illumination, comprising: setting a dimming signal such that the illumination has a constant signal waveform; Setting a data signal to be transmitted using the dimming signal; Mixing and synthesizing the data signal and the dimming signal generated according to the set data signal and the dimming signal while the illumination is turned off; A data signal interleaving method using pulse amplitude modulation may be provided.

In one or several embodiments of the present invention, the setting of the dimming signal may be accomplished by setting an illumination period, an amplitude, and a duty ratio.

In one or more embodiments of the present disclosure, the setting of the data signal may further include setting a data signal transmission period and a data signal transmission rate to match the set dimming signal.

In one or more embodiments of the present invention, the mixing and synthesizing of the data signal and the dimming signal may be performed after synchronizing the dimming signal and the data signal.

In one or more embodiments of the present invention, the duty ratio is constant at the time of synthesizing the data signal.

In one or several embodiments of the present invention, the brightness of the illumination may use pulse amplitude modulation, which is controlled by the duty ratio.

In one or more embodiments of the present invention, the data signal is characterized in that a smaller duty ratio can transmit a larger amount of data.

In one or more embodiments of the present invention, there is provided a data signal interleaving system using illumination, comprising: a dimming signal setting unit configured to set a period, an amplitude, and a duty ratio of the illumination; A dimming signal generator for inputting a signal output from the dimming signal setting unit to generate a dimming signal; A data signal setting unit for setting a data signal to be transmitted; A data signal generator for inputting a signal output from the data signal setting unit to generate a data signal; A dimming signal lighting module configured to perform a dimming function by receiving a dimming signal output from the dimming signal generator; And a data signal lighting module configured to receive a data signal output from the data signal generator and to transmit a data signal. A data signal interleaving system using pulse amplitude modulation may be provided.

In one or more embodiments of the present invention, the data signal interleaving system may include one or more of the dimming signal lighting modules and one or more of the data signal lighting modules.

In one or more embodiments of the present invention, there is provided a data signal interleaving method using illumination, comprising: setting a dimming signal such that the illumination has a constant signal waveform; Setting a data signal to be transmitted using the dimming signal; Mixing a data signal generated in the lighting module for data signal and a dimming signal generated in the dimming signal lighting module according to the dimming signal according to the set data signal; A data signal interleaving method using pulse amplitude modulation may be provided.

In one or several embodiments of the present invention, the setting of the dimming signal may be accomplished by setting an illumination period, an amplitude, and a duty ratio.

According to embodiments of the present invention, by synthesizing the data signal during the time that the illumination is turned off, the data signal may be transmitted without greatly changing the brightness of the illumination, thereby minimizing the change in the color coordinate value.

In addition, embodiments of the present invention may make the brightness of the illumination constant by making the duty ratio constant.

In addition, embodiments of the present invention can prevent a large current from being consumed when sending a data signal by transmitting a data signal when lighting is turned off.

In addition, embodiments of the present invention may implement a smart factory, a smart office, a smart home using lighting.

1 is a block diagram of an interleaving system using pulse amplitude modulation according to a first embodiment of the present invention.
2 is a signal waveform diagram at the time of interleaving according to the pulse amplitude modulation method according to the first embodiment of the present invention.
3 is a flowchart illustrating an interleaving method according to a pulse amplitude modulation method according to a first embodiment of the present invention.
4 is a block diagram of an interleaving system according to a pulse amplitude modulation scheme according to a second embodiment of the present invention.
5 and 6 are configuration diagrams of an interleaving system according to a second embodiment of the present invention.
7 is a signal waveform diagram according to a general pulse amplitude modulation scheme.
8 is a signal waveform diagram according to a general pulse width modulation method.
9 is a signal waveform diagram according to a general direct module method.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention.

Such an embodiment may be embodied in various different forms as one of ordinary skill in the art to which the present invention pertains, and is not limited to the embodiments described herein.

1 is a block diagram of an interleaving system using pulse amplitude modulation (PAM) according to a first embodiment of the present invention. Referring to FIG. 1, the pulse amplitude modulation according to the first embodiment of the present invention. The apparatus includes a dimming signal setting unit 10 for setting a period, an amplitude, and a duty ratio of illumination, and a dimming signal for generating a dimming signal by a signal output from the dimming signal setting unit 10. The generation unit 30, the data signal setting unit 20 for setting a data signal according to the dimming signal set by the dimming signal setting unit 10, and the data according to the signal output from the data signal setting unit 20. Including a data signal generator 40 for generating a signal, and a data and dimming signal synthesizer 50 for synthesizing respective signals output from the data signal generator 40 and the dimming signal generator 30. Is done.

Although not shown in FIG. 1, the first embodiment of the present invention requires at least one light source capable of transmitting light in a dimmable lighting environment. Light sources used in the field of optical communication can be classified into analog light sources and digital light sources. According to an embodiment of the present invention, digital light sources are suitable as the light sources are required to mix data at the time of illumination.

In addition, the human eye has a nonlinear response to light levels. That is, at a low light level, the amount of light perceived by a person is greater than that measured by a lux meter, so it is understood that it is necessary to provide a dimming level with a large amount of illumination, which is used in the embodiment of the present invention. The dimming range of can change the luminance between 0.1% and 100% to have the most useful dimming range for the user.

In general, lighting devices are those using the afterimage effect of the human eye, and dimming (dimming) refers to adjusting the brightness and color of the lighting device using the afterimage effect.

Therefore, the dimming signal setting unit 10 is a device for setting the brightness of the lighting equipment required in the use environment, the brightness is determined to a constant value according to the use environment. That is, in a place where a bright environment is required, the brightness is set to a high brightness, but in a place where a bright environment is required, the brightness is set a little lower to prevent the illumination from being too bright.

In particular, in a space where an operator should always be nervous, such as in a large-scale manufacturing plant of an object, the luminance is not set high so as to prevent an accident in advance.

This is also a precondition for interleaving a large amount of data signals as will be described later. In the above, interleaving means that any one or more signals are mixed with other signals. Interleaving methods include a method of interleaving with a single pulse, a method of mixing independent signals as a result of being transmitted, respectively. As will be described later, the first embodiment of the present invention relates to the former, and the second embodiment of the present invention relates to the latter.

The value set by the dimming signal setting unit 10 is input to the data signal setting unit 20 and the dimming signal generator 30, and the data signal setting unit 20 transmits data to match the input dimming signal. A signal is set, and the dimming signal generator 30 generates a dimming signal to match the input dimming signal. The brightness and color of the illumination are adjusted by the dimming signal. According to an embodiment of the present invention, as described above, the dimming signal refers to a signal including a period, an amplitude, and a duty ratio of illumination.

In this case, the light source of the illumination may be a light emitting diode (LED), an organic light emitting diode (OLED), a lamp, or the like.

The data signal output from the data signal setting unit 20 is input to the data signal generator 40 to generate a data signal to be transmitted. The data signal at this time means a signal including a data signal transmission period and a data signal transmission rate.

The data signal and the dimming signal generated above are synchronized to be synthesized, and then synthesized into one pulse by the data and dimming signal synthesizing unit 50 to transmit the data signal simultaneously with the dimming function.

2 shows a signal waveform diagram according to the pulse amplitude modulation method according to the first embodiment of the present invention. Referring to FIG. 2, it can be seen that the data signal is interleaved with the dimming signal of the illumination, and it can be seen that the data is synthesized only while the illumination is off.

That is, according to the first embodiment of the present invention, the data signal modulation is performed by a pulse amplitude modulation method, and the data signal is synthesized in a state in which illumination is turned off to a signal having the same period. As a result, a dimming function, that is, a function of adjusting brightness by repeating on / off of illumination is performed while the data signal is synthesized and modulated.

The duty ratio is determined according to a time ratio of on / off of the illumination, and the data signal interleaving is performed by combining a data signal with the input dimming signal when the illumination is off.

In an embodiment according to the present invention, the duty ratio refers to the ratio of on to off of the lighting per bit time.

At this time, the interleaving of the data signal is performed in a state where the duty ratio is constant, so that illumination of a constant brightness is achieved even when data signals are synthesized. In addition, since the data signal is synthesized when the illumination is turned off and a large current is not required, the current consumed when the data signal is transmitted can be reduced. That is, the current used for interleaving the data signal to the dimming signal may use a current lower than the current required for dimming signal transmission.

Hereinafter, a pulse amplitude modulation method according to a first embodiment of the present invention will be described.

3 is a flowchart illustrating a modulation method according to a pulse amplitude modulation method using illumination according to a first embodiment of the present invention. Referring to FIG. 3, first, a dimming signal, that is, illumination, has a predetermined signal waveform. Set the period, amplitude and duty ratio of (S110).

A dimming signal is generated according to the set period, amplitude, and duty ratio of the illumination (S120), and the dimming signal is synchronized with a data signal to be described later (S130).

In addition, the transmission period of the data signal to be synthesized and transmitted to the dimming signal is set (S140), the transmission rate of the data signal to be transmitted is set according to the set data signal transmission period (S150), and then the dimming signal Synchronizing with (S160) provides a condition that the data signal can be interleaved with the dimming signal.

The synchronized dimming signal and the data signal are mixed with each other (S170) and synthesized. The dimming signal and the data signal are synthesized while the illumination is blinking according to the set duty ratio.

In this case, since the data signal is synthesized by synthesizing the data signal with the dimming signal using a small current while the illumination is turned off, it does not significantly affect the brightness of the entire lighting, thereby minimizing the change in color coordinates. Can be.

By doing the above, when the data signal is synthesized, the dimming signal of the illumination and the data signal are represented in one pulse form. When the data signal is transmitted, the duty ratio is constant so as not to affect the brightness of the entire lighting.

At this time, the smaller the duty ratio is, the larger the amount of data can be transmitted. If the duty ratio is small, the lighting time of the light is shortened, so that the time (light off time) for synthesizing the data is sufficient. This is because the data 1 or 0 can be transmitted. According to an embodiment of the present invention, the interleaving of the data signal to the dimming signal is performed when the duty ratio is constant, and the brightness of the illumination can be adjusted by adjusting the duty ratio. Therefore, the brightness of the illumination depends only on the duty ratio and is not greatly affected by the data to be transmitted.

As described above, according to the first embodiment of the present invention, the data signal can be interleaved with the dimming signal without significantly affecting the brightness of the illumination, and the illumination can be used for data transmission during the off portion of each cycle. have.

Hereinafter, an interleaving system according to a second embodiment of the present invention will be described.

Unlike the first embodiment, the second embodiment of the present invention transmits a dimming signal and a data signal from the dimming signal lighting module 70 and the data signal lighting module 60 to interleave the dimming signal and the data signal. It differs in that point.

That is, in the second embodiment of the present invention, since the dimming signal and the data signal are sent by separate modules 60 and 70, there is no need to synchronize. 4 is a block diagram of an interleaving system according to a pulse amplitude modulation method according to a second embodiment of the present invention. Referring to FIG. 4, a dimming signal lighting module 70 and a data signal lighting module 60 are separately. It is different from the first embodiment of the present invention shown in Figure 1 in that it is formed, the rest of the configuration is the same as in FIG.

In addition, the second embodiment of the present invention is a manner in which signals transmitted from separate modules 60 and 70 are mixed while performing their own functions by their own pulses, but as a result, as shown in FIG. The effect that the dimming signal is interleaved can be achieved.

However, instead of interleaving the data signal to the dimming signal when the illumination is turned off, the dimming signal and the data signal are separately transmitted and mixed so that the data signal does not need to be transmitted in accordance with the dimming signal. There is no need to synchronize.

5 and 6 are schematic diagrams of an interleaving system 100 according to a second embodiment of the present invention. Referring to FIGS. 5 and 6, at least one dimming signal lighting module 70 and at least one data signal lighting module are shown. It can be seen that 60 constitutes one interleaving system 100.

According to the second embodiment of the present invention, an arrangement of the dimming signal lighting module 70 and the data signal lighting module 60 may be arranged as shown in FIG. 5 or FIG. 6, but this is only one embodiment. It is not limited and may be arranged differently according to a user's use environment, and the number of lighting modules 60 and 70 may be adjusted.

Hereinafter, an interleaving system and method according to a second embodiment of the present invention will be described.

First, referring to the interleaving method according to the second embodiment of the present invention, the data signal generated by the data signal lighting module 60 according to the set data signal is not combined with the dimming signal and the data signal into one pulse. According to the dimming signal, a method of interleaving a data signal may be provided by mixing a dimming signal generated by the dimming signal lighting module 70.

Even in this case, the dimming signal is determined by the illumination period, amplitude, and duty ratio. However, since the data signal is not transmitted when the illumination is turned off as described above, the dimming signal and the data signal are not synchronized at this time. In this case, however, the brightness of the illumination is adjusted by the duty ratio.

That is, the dimming signal is performed independently of the data signal transmission by the dimming signal, and the data signal is also transmitted independently of the dimming signal, but as a result, the dimming signal and the data signal are interleaved using pulse amplitude modulation. Effect is achieved.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and is easily changed and equivalent to those skilled in the art from the embodiments of the present invention. Includes all changes to the acceptable scope.

10: dimming signal setting unit
20: data signal setting unit
30: dimming signal generator
40: data signal generator
50: data and dimming signal synthesis unit
60: lighting module for data signals
70: lighting module for dimming signals
100: interleaving system

Claims (16)

In a data signal interleaving system using illumination,
A dimming signal setting unit configured to set a period, an amplitude, and a duty ratio of the illumination;
A dimming signal generator for inputting a signal output from the dimming signal setting unit to generate a dimming signal;
A data signal setting unit for setting a data signal to be transmitted;
A data signal generator for inputting a signal output from the data signal setting unit to generate a data signal;
A data and dimming signal synthesizer configured to synthesize a dimming signal output from the dimming signal generator and a data signal output from the data signal generator to generate a modulated signal;
Data signal interleaving system using a pulse amplitude modulation comprising a. The method of claim 1,
And synthesizing the dimming signal and the data signal is performed by interleaving the data signal with the dimming signal when the illumination is turned off. The method according to claim 1 or 2,
The data signal interleaving system using pulse amplitude modulation is set to match the dimming signal output from the dimming signal setting unit. The method of claim 3,
And synthesizing the dimming signal and the data signal using a pulse amplitude modulation in which the duty ratio is constant. The method of claim 4, wherein
And synthesizing the data signal and the dimming signal using pulse amplitude modulation using a current lower than the current required for dimming signal transmission. In the data signal interleaving method using illumination,
Setting a dimming signal such that the illumination has a constant signal waveform;
Setting a data signal to be transmitted using the dimming signal;
Mixing and synthesizing the data signal and the dimming signal generated according to the set data signal and the dimming signal while the illumination is turned off;
Data signal interleaving method using pulse amplitude modulation comprising a. The method of claim 6,
And setting the dimming signal comprises setting an illumination period, an amplitude, and a duty ratio. The method of claim 6,
The setting of the data signal may further include setting a data signal transmission period and a data signal transmission rate to match the set dimming signal. The method of claim 6,
And mixing and synthesizing the data signal and the dimming signal after synchronizing the dimming signal with the data signal. The method of claim 6,
And a duty ratio is constant when synthesizing the data signal. The method according to any one of claims 6 to 10,
And brightness of the illumination is controlled by the duty ratio. The method according to any one of claims 6 to 10,
The data signal interleaving method using pulse amplitude modulation, characterized in that the smaller the duty ratio can transmit a larger amount of data. In a data signal interleaving system using illumination,
A dimming signal setting unit configured to set a period, an amplitude, and a duty ratio of the illumination;
A dimming signal generator for inputting a signal output from the dimming signal setting unit to generate a dimming signal;
A data signal setting unit for setting a data signal to be transmitted;
A data signal generator for inputting a signal output from the data signal setting unit to generate a data signal;
A dimming signal lighting module configured to perform a dimming function by receiving a dimming signal output from the dimming signal generator;
And a data signal lighting module configured to receive a data signal output from the data signal generator and to transmit a data signal.
Data signal interleaving system using a pulse amplitude modulation comprising a. The method of claim 13,
And said data signal interleaving system comprises at least one illumination module for dimming signals and at least one illumination module for data signals. In the data signal interleaving method using illumination,
Setting a dimming signal such that the illumination has a constant signal waveform;
Setting a data signal to be transmitted using the dimming signal;
Mixing a data signal generated in the lighting module for data signal and a dimming signal generated in the dimming signal lighting module according to the dimming signal according to the set data signal;
Data signal interleaving method using pulse amplitude modulation comprising a. 16. The method of claim 15,
And setting the dimming signal comprises setting an illumination period, an amplitude, and a duty ratio.

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