KR20190084445A - Apparatus and method for transmitting a signal using on-off keying scheme in a wireless communication system - Google Patents

Abstract

The present specification relates to a transmission apparatus for transmitting a signal using an on-off keying modulation method in a wireless communication system. According to the present invention, the transmission apparatus comprises: a radio frequency (RF) module for transmitting and receiving a wireless signal; and a modulator functionally connected to the RF module. The modulator includes inductors respectively disposed on a first line through which a baseband signal is transmitted and a second line through which a carrier signal is transmitted. The inductors disposed in each of the lines are connected to a parasitic capacitor of a transistor included in the modulator.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method and apparatus for transmitting a signal using an on-off keying scheme in a wireless communication system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmitting apparatus and a receiving apparatus for transmitting a signal, and more particularly, to a transmitting apparatus and a receiving apparatus using a modulator and a demodulator of an on-off keying scheme.

On-off keying (OOK) is a kind of modulation method for displaying digital data depending on the presence or absence of a carrier wave, and is the simplest method among the amplitude shift keying.

That is, the on-off modulation is the simplest modulation scheme. The presence of a carrier transmitted at a certain time is represented by binary '1', and the lack of a carrier at a certain time (non-existent state) is represented by binary '0'.

There is also a way to vary the length of on and off (eg, Morse code) to add more information in a more complex way.

The on-off modulation is used for transmission of Morse codes that transmit radio frequencies (see continuous waveform). This morse code does not use a basic digital demodulation circuit. OOK is also used to send and receive ISM band data between computers.

Spectral efficiency is not good because OOK changes the amplitude of the carrier significantly.

It is possible to alleviate the efficiency by adjusting the rise and fall of the carrier amplitude at the low-to-intermediate transmission rate. At higher speeds, more efficient modulation schemes (e.g., frequency shift keying) are commonly used.

That is, existing on-off keying modulators and demodulators have a disadvantage in that the switching loss increases and characteristics deteriorate as the frequency increases toward the high frequency due to parasitic components of the transistors.

That is, in wireless communications requiring high data rates, the parasitic capacitance component of these transistors causes a slow response speed of the signal.

This makes it difficult to implement a wireless communication system having a high data rate.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an on-off keying modulator and a demodulator having a parasitic capacitance component of a transistor removed using a distributed inductor structure, thereby achieving a higher data rate.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, unless further departing from the spirit and scope of the invention as defined by the appended claims. It will be possible.

The present invention relates to a transmitting apparatus for transmitting a signal using an on-off keying modulation scheme in a wireless communication system, the apparatus comprising: a radio frequency module for transmitting and receiving a radio signal; And a modulator operatively connected to the RF module, wherein the modulator comprises a first line through which a baseband signal is transmitted and a second line through which a carrier signal is transmitted, And an inductor disposed in each line is connected to a parasitic capacitor of a transistor included in the modulator.

Also, in this specification, the inductor disposed on the first line and the inductor disposed on the second line form an artificial transmission line respectively with the parasitic capacitor.

Also, in this specification, the modulator adjusts the time delay of signals output through the respective artificial transmission lines formed in the same manner.

In the present invention, the modulator is characterized in that the on-off state of the transistor is determined according to the voltage value of the base signal.

Also, in this specification, a modulator for modulating a signal using an on-off keying modulation scheme in a wireless communication system includes: a first line through which a baseband signal is transmitted; A second line through which a carrier signal is transmitted; At least one transistor; And an inductor disposed in each of the first line and the second line, and the inductor disposed in each line is connected to a parasitic capacitor of the transistor.

Also, in this specification, a receiving apparatus for receiving a signal using an on-off keying demodulation scheme in a wireless communication system, includes: a radio frequency module for transmitting and receiving a radio signal; And a demodulator functionally connected to the RF module, wherein the demodulator is arranged in a first line through which a baseband signal is transmitted and a second line through which a carrier signal is transmitted, And an inductor disposed in each line is connected to a parasitic capacitor of a transistor included in the demodulator.

Also, in this specification, a demodulator for demodulating a signal using an on-off keying demodulation scheme in a wireless communication system, includes: a first line through which a baseband signal is transmitted; A second line through which a carrier signal is transmitted; At least one transistor; And an inductor disposed in each of the first line and the second line, and the inductor disposed in each line is connected to a parasitic capacitor of the transistor.

The present specification has the effect of having a fast response speed to a signal by removing a component of a parasitic capacitance and / or a harmonic component of a transistor by using an inductor dispersedly arranged in each line.

Accordingly, the on-off keying modulators and demodulators proposed herein enable high-speed communication with higher data rates.

In addition, it is possible to implement a chip-to-chip communication system capable of communicating with only one chip in high-speed communication using CMOS through the distributed inductor structure proposed in this specification.

It is expected to be used in a variety of fields such as Internet between objects and communication between electronic devices in automobiles.

The effects obtained in the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the following description .

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the technical features of the invention.
1 is a diagram showing an example of an on-off keying modulator proposed in the present specification.
2 is a diagram showing an example of an on-off keying demodulator proposed in the present specification.
FIG. 3A is a diagram showing an example of a base signal, and FIG. 3B is a diagram showing an example of a carrier signal.
4 is a diagram showing an example of a base signal, a carrier signal, and a signal in which two signals are combined, which can be applied to the modulator and demodulator proposed in the present specification.
5 shows a simple one-stage OOK modulator proposed herein.
Figure 6 shows a simple form of an OOK modulator proposed herein.
FIG. 7A shows an example of a modulated signal input to the demodulator, and FIG. 7B shows an example of a signal output through the demodulator.
8 shows an example of the components of the parasitic capacitance and thus the distortion of the signal.
9 shows an example of a distributed arrangement of inductor structures applicable to the modulator and demodulator proposed in this specification.
10 illustrates a block diagram of a wireless communication apparatus according to an embodiment of the present invention.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

The suffix "module" and " part "for components used in the following description are given merely for ease of description, and the" module "and" part "

Meanwhile, the device or device described in this specification is a device capable of wireless communication, and can be a mobile phone including a smart phone, a tablet PC, a desktop computer, a notebook, a smart TV, a television including an IPTV, and the like.

In the following, embodiments of the present invention will be described in detail with reference to the accompanying drawings and accompanying drawings, but the present invention is not limited to or limited by the embodiments.

As used herein, terms used in the present invention are selected from general terms that are widely used in the present invention while taking into account the functions of the present invention, but these may vary depending on the intention or custom of a person skilled in the art or the emergence of new technologies.

In addition, in certain cases, there may be a term arbitrarily selected by the applicant, in which case the meaning thereof will be described in the description of the corresponding invention.

Therefore, it is intended that the terminology used herein should be interpreted based on the meaning of the term rather than on the name of the term, and on the entire contents of the specification.

Hereinafter, an on-off keying modulator and a demodulator for providing a high data rate without time delay will be described.

That is, the present invention provides an on-off keying modulator for extracting a parasitic capacitance component and dispersing an inductor to remove the parasitic capacitance component, in order to solve the problem that a slow response speed is generated by a parasitic capacitance component of a transistor, Demodulator.

That is, as shown in FIGS. 1 and 2, the inductor L / 2 for eliminating the parasitic capacitance component is dispersed and arranged in a line through which a carrier signal and a baseband signal pass, respectively .

That is, the distributed inductors combine with the capacitors inside the transistors to form artificial transmission lines.

That is, the modulator and the demodulator of the inductor dispersion arrangement structure of the present invention operate as an artificial transmission line for each of the base signal and the carrier signal, and operate in the same time delay as the lossless transmission line.

Therefore, by using the structure of the distributed inductors, a signal can be output without signal distortion due to time delay.

1 is a diagram showing an example of an on-off keying modulator proposed in the present specification.

The modulator of FIG. 1 may be included in the transmitting apparatus of FIG. 10 to be described later.

The modulator may include the following configuration.

That is, the modulator includes a first line through which a baseband signal is transmitted, a second line through which a carrier signal is transmitted, at least one transistor, and at least one inductor disposed in the first line and the second line, and an inductor.

Here, the inductors arranged in the respective lines are connected to the parasitic capacitors of the transistors.

The inductor disposed on the first line and the inductor disposed on the second line may form an artificial transmission line with the parasitic capacitor, respectively.

The on-off keying modulator shown in FIG. 1 determines the on-off state of the transistor in accordance with the voltage value of the base signal, so that the amplitude of the carrier signal appears differently in the output stage.

If the gate voltage is turned on, the carrier signal is pulled to the common terminal, and the output stage has only a small amplitude.

If the gate voltage is turned off, most of the signal travels along the dispersion line, and a carrier signal having an amplitude similar to that of the carrier signal input to the output terminal is output.

2 is a diagram showing an example of an on-off keying demodulator proposed in the present specification.

The demodulator of FIG. 2 may be included in the reception apparatus of FIG. 10 to be described later.

The demodulator may include the following configuration.

That is, the demodulator includes a first line through which a baseband signal is transmitted, a second line through which a carrier signal is transmitted, at least one transistor, and at least one inductor disposed in the first line and the second line, and an inductor.

Here, the inductors disposed in the respective lines may be connected to the parasitic capacitors of the transistors.

The inductor disposed on the first line and the inductor disposed on the second line may form an artificial transmission line with the parasitic capacitor, respectively.

The on-off keying demodulator proposed in this specification not only removes components of parasitic capacitances but also harmonic components by using a distributed arrangement of inductor structures.

However, the on-off keying demodulator proposed in the present invention adjusts the delay of the artificial transmission line for each signal so that the harmonic effect generated by the time delay Can be removed.

In summary, the on-off keying modulator and demodulator shown in FIGS. 1 and 2 implement a modulation and demodulation scheme in which the amplitude of the carrier signal varies according to the logical value of the base signal.

Here, the base signal and the carrier signal pass through the artificial transmission line formed by the parasitic capacitance (the capacitance between the drain and the source (Cds) and the capacitance between the gate and the source (Cgs)) of the distributed inductor and the transistor.

An artificial transmission line is formed by a capacitance between an inductor L / 2 and a drain-source in which a carrier signal is distributed, and a line through which a base signal passes is divided into an inductor L / 2 and an inductor L / The artificial transmission line is formed.

That is, in the present invention, when the time delay occurring between the base signal and the carrier signal through each artificial transmission line is the same, the same result as that without the time delay can be obtained.

This may be possible by obtaining the parasitic capacitance of the transistor and calculating the resulting inductance value to form an artificial transmission line for each signal as previously discussed.

Meanwhile, the size of the transistor used in the modulator and the demodulator proposed in the present specification can reduce the size of the circuit by minimizing the parasitic capacitance component.

Also, the number of stages of the overall modulator is determined by considering insertion loss and isolation.

Thus, the on-off keying modulators and demodulators proposed herein can speed up the response time for higher data rates compared to conventional modulators and demodulators.

Here, the baseband signal is a signal containing actual information, and may be represented by 0 or 1. Fig. 3A shows an example of a base signal, and Fig. 3B shows an example of a carrier signal.

Also, a carrier signal is a signal for carrying and transmitting a base signal including information, and is a high frequency signal having a frequency much higher than that of the base signal.

4 is a diagram showing an example of a base signal, a carrier signal, and a signal in which two signals are combined, which can be applied to the modulator and demodulator proposed in the present specification.

5 shows an example of the on-off keying modulator proposed in this specification, which represents the simplest one-stage OOK modulator.

Fig. 5 can be simply expressed as shown in Fig. 6 according to the voltage value of the base signal applied to the gate.

Figure 6 shows a simple form of an OOK modulator proposed herein.

As shown in FIG. 6A, when the gate is On, Vout becomes 0V (ideally), and when the gate is Off as shown in FIG. 6B, Vout becomes a carrier signal It appears as it is.

The base signal in Fig. 6 can use a signal having 0 and 1 shown in Fig. 3A.

Next, the on-off keying demodulator shown in FIG. 2 will be described in more detail.

The on-off keying demodulator utilizes the output (modulated signal) in the on-off keying modulator as a differential structure.

That is, in FIG. 2, the phase difference between the modulated signal 1 and the modulated signal 2 is 180 degrees.

Similar to the operation in the modulator, when the gate voltage is turned on, Vout becomes 0 V, and when the gate voltage is turned off, the Vdd voltage is output.

Here, the modulated signal (FIG. 7A) input to the demodulator appears as the output of FIG. 7B through the demodulator.

Here, the signal output from the demodulator corresponds to a base signal including information.

The advantages of the on-off keying demodulator proposed in this specification will be summarized briefly.

First, there is an on-off keying demodulator having a number of structures.

However, the existing on-off keying demodulator is disadvantageous in that the response speed is slow for high frequency (high data rate, high-speed operation, etc.) due to parasitic capacitance component of the transistor.

That is, in the conventional demodulator, the base signal output due to the slow response speed is distorted as shown in FIG. 8A, which is due to the parasitic capacitance components (Cgs and Cds) in FIG. 8B.

1 and 2, the effect of parasitic capacitance (Cgs, Cgd) can be eliminated by forming an artificial cable line for each signal by dispersing the inductors in the line for each signal, Can be obtained.

That is, the on-off keying modulator and the demodulator proposed in the present specification allow a high data rate to be realized by distributing the inductor to the line for each signal.

9 shows an example of a distributed arrangement of inductor structures applicable to the modulator and demodulator proposed in this specification.

The left part of FIG. 9 shows an artificial transmission line made up of the inductor and the capacitance.

The signal passing through this artificial transmission line has a time delay of (LC) ^1/2 .

That is, by arranging the inductors as shown in FIG. 9, the parasitic capacitances Cgd and Cgs and the inductor form an artificial transmission line to eliminate the effect on the parasitic capacitance of the transistor.

At this time, the time delay of the artificial transmission line through which the carrier signal and the base signal respectively pass is made equal (due to the time delay), so that the signal can be supplied without distortion.

As such, the content of the parasitic capacitance removal through the inductor structure of FIG. 9 can be applied to both the on-off keying modulator and the demodulator.

In particular, the on-off keying demodulator proposed in this specification can simultaneously remove the effect on the harmonic as well as the effect on the parasitic capacitance.

Apparatus to which the present invention may be applied

10 illustrates a block diagram of a wireless communication apparatus according to an embodiment of the present invention.

10, the wireless communication system includes a transmitting apparatus 1010 and a receiving apparatus 1020. [

The transmitting apparatus 1010 includes a processor 1011, a memory 1012, and a communication module 1013.

The processor 1011 implements the functions, structures, processes and / or methods suggested in FIGS. 1-9 above. The layers of the wired / wireless interface protocol may be implemented by the processor 1011.

In particular, the processor may include an on-off keying modulator as proposed herein, or may be implemented to perform the function of an on-off keying modulator.

Alternatively, the on-off keying modulator may be implemented separately from the processor.

The memory 1012 is connected to the processor 1011 and stores various information for driving the processor 1011. [

The communication module 1013 is connected to the processor 1011 to transmit and / or receive a wired / wireless signal.

The communication module 1013 may include a radio frequency unit for transmitting / receiving a radio signal.

The receiving apparatus 1020 includes a processor 1021, a memory 1022, and a communication module (or RF unit)

The processor 1021 implements the functions, structures, processes and / or methods suggested in FIGS. 1-9 above. The layers of the air interface protocol may be implemented by the processor 1021.

In particular, the processor may include an on-off keying demodulator as proposed herein, or may be implemented to perform the function of an on-off keying demodulator.

Alternatively, the on-off keying demodulator may be implemented separately from the processor.

The memory 1022 is coupled to the processor 1021 to store various information for driving the processor 1021. Communication module 1023 is coupled to processor 1021 to transmit and / or receive wireless signals.

The memories 1012 and 1022 may be internal or external to the processors 1011 and 1021 and may be coupled to the processors 1011 and 1021 in various well known means.

In addition, the transmitting apparatus 1010 and / or the receiving apparatus 1020 may have a single antenna or multiple antennas.

The embodiments described above are those in which the elements and features of the present invention are combined in a predetermined form. Each component or feature shall be considered optional unless otherwise expressly stated. Each component or feature may be implemented in a form that is not combined with other components or features. It is also possible to construct embodiments of the present invention by combining some of the elements and / or features. The order of the operations described in the embodiments of the present invention may be changed. Some configurations or features of certain embodiments may be included in other embodiments, or may be replaced with corresponding configurations or features of other embodiments. It is clear that the claims that are not expressly cited in the claims may be combined to form an embodiment or be included in a new claim by an amendment after the application.

Embodiments in accordance with the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof. In the case of hardware implementation, an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs) field programmable gate arrays, processors, controllers, microcontrollers, microprocessors, and the like.

In the case of an implementation by firmware or software, an embodiment of the present invention may be implemented in the form of a module, a procedure, a function, or the like which performs the functions or operations described above. The software code can be stored in memory and driven by the processor. The memory is located inside or outside the processor and can exchange data with the processor by various means already known.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the essential characteristics thereof. Accordingly, the foregoing detailed description is to be considered in all respects illustrative and not restrictive. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.

The present invention has been described with reference to the on-off keying modulation and demodulation examples of the present invention, but it is also possible to apply it to various methods.

1100: Transmitting device
1120: Receiving device

Claims (12)

A transmitting apparatus for transmitting a signal using an on-off keying modulation scheme in a wireless communication system,
A radio frequency module for transmitting and receiving radio signals; And
And a modulator operatively coupled to the RF module, the modulator comprising:
A first line through which a baseband signal is transmitted and an inductor disposed in a second line through which a carrier signal is transmitted,
Wherein the inductors disposed in each line are connected to the parasitic capacitors of the transistors included in the modulator. The method according to claim 1,
Wherein the inductor disposed in the first line and the inductor disposed in the second line form an artificial transmission line with the parasitic capacitor, respectively. 3. The apparatus of claim 2, wherein the modulator comprises:
And adjusts the time delay of the signal output through each artificial transmission line to be equal. The method according to claim 1,
Wherein the modulator determines the on-off state of the transistor according to a voltage value of the base signal. A modulator for modulating a signal using an on-off keying modulation scheme in a wireless communication system,
A first line through which a baseband signal is transmitted;
A second line through which a carrier signal is transmitted;
At least one transistor; And
And an inductor disposed in each of the first line and the second line,
And an inductor disposed in each line is connected to a parasitic capacitor of the transistor. The method according to claim 1,
Wherein the inductor disposed on the first line and the inductor disposed on the second line form an artificial transmission line respectively with the parasitic capacitor. The method according to claim 6,
Wherein the time delays of the signals output through the respective artificial transmission lines formed are the same. 6. The method of claim 5,
And the on / off state of the transistor is determined according to the voltage value of the base signal. A receiving apparatus for receiving a signal using an on-off keying demodulation scheme in a wireless communication system,
A radio frequency module for transmitting and receiving radio signals; And
And a demodulator operatively coupled to the RF module, the demodulator comprising:
A first line through which a baseband signal is transmitted and an inductor disposed in a second line through which a carrier signal is transmitted,
Wherein the inductors arranged in each line are connected to the parasitic capacitors of the transistors included in the demodulator. 10. The method of claim 9,
Wherein the inductor disposed in the first line and the inductor disposed in the second line form an artificial transmission line with the parasitic capacitor, respectively. A demodulator for demodulating a signal using an on-off keying demodulation scheme in a wireless communication system, the demodulator comprising:
A first line through which a baseband signal is transmitted;
A second line through which a carrier signal is transmitted;
At least one transistor; And
And an inductor disposed in each of the first line and the second line,
And the inductors disposed in the respective lines are connected to parasitic capacitors of the transistors. 12. The method of claim 11,
Wherein the inductor disposed in the first line and the inductor disposed in the second line form an artificial transmission line respectively with the parasitic capacitor.

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