KR100651835B1 - Digital Multimedia Broadcasting a receiving set - Google Patents

Abstract

The present invention is to provide a receiving apparatus and a receiving method which can watch digital multimedia broadcasting on the move, and a control apparatus used for the receiving apparatus to improve the performance of the receiving apparatus in a transition region. And a receiving device and a receiving method comprising a gap filler antenna, a control part, and a terminal, and the control device used in the receiving device further includes a switch part and a controller to improve deterioration of receiving performance in a transition region. do. Therefore, according to the present invention, even when moving between the downtown area and the outlying area, the digital multimedia broadcasting can be watched without interruption, and the performance of the receiving device can be greatly improved even in the transition area.

DMB, Gap Filler, Satellite Antenna

Description

Digital multimedia broadcasting receiving device and control device and method for controlling the same {Digital Multimedia Broadcasting a receiving set}

1 is a conceptual block diagram showing a digital multimedia broadcasting receiving apparatus according to the present invention

2 is a block diagram illustrating an internal configuration of a control unit of a receiving apparatus according to the present invention.

3 is a view showing a preferred embodiment to improve the reception performance in the transition region according to the present invention

4 is a block diagram showing another embodiment configured to improve reception performance according to the present invention.

5 is a block diagram showing another embodiment configured to improve reception performance according to the present invention.

6 is a flowchart illustrating a method for improving reception performance in a transition region of a satellite and a gap filler signal when receiving a digital multimedia broadcast using a reception apparatus according to the present invention.

* Explanation of symbols for main parts of the drawings

100: satellite antenna 110: gap filler antenna

120: control unit 130: transmitter

140: terminal 210: adder

220: amplifier 310: reference receiver

320: switch unit 410: wired receiver

420: wired transmitter 510: wireless receiver

520: Wireless Transmitter

The present invention relates to a digital multimedia broadcasting receiving apparatus, and more particularly, a receiving apparatus capable of receiving both a signal transmitted from a satellite and a signal transmitted from a gap filler when moving between a downtown area and a suburb. An apparatus and method are provided for improving reception performance in a transition region.

Digitalization of broadcasts has enabled digital multimedia broadcasting (DMB), which encompasses data transmission and multimedia services.

Recently, with the rapid spread of digital audio devices with excellent sound quality such as CD and DVD, users' demand for digital broadcasting that provides high quality sound is increasing day by day.

Accordingly, Digital Audio Broadcasting (DAB) is currently being implemented in Europe, the United States, and Canada, and in Korea, ITU-R international standard analysis and broadcasting methods for terrestrial and satellite digital audio broadcasting (DAB) services are being implemented. The research is active.

The satellite digital multimedia broadcasting (DMB) adopted and used in Korea is based on the Japanese system E system and consists of a performance equipment, earth station, satellite, terrestrial relay equipment (gap filler) and subscriber receiver (terminal).

The digital multimedia broadcasting is robust to noise and distortion on a transmission channel, and has a high transmission efficiency and various multimedia services. However, the transmission channel of the satellite digital multimedia broadcasting is a wireless mobile reception channel and has a size of a received signal. Not only is Amplitude time-varying, but Doppler shift of the received signal spectrum may occur due to the influence of mobile reception.

In consideration of the transmission and reception under such a channel environment, the satellite digital multimedia transmission method adopts a code division multiplexing (CDM) method and performs interleaving on time domain signals to remove errors occurring in a transmission channel. Correction was made.

The satellite digital multimedia broadcasting apparatus transmits the multimedia contents from the earth station transmission center to the satellite by using the CDM transmission method, and the user uses it to compensate for the shaded areas where the strength of the signal received from the satellite or the signal received from the satellite is weak. It is received from the ground auxiliary relay equipment called the gap filler.

In general, satellite broadcasting and satellite communication using stationary satellites can communicate only when the line of sight (LOS) of the satellite is guaranteed. The satellite transmits by S-band, and the area where it can receive the service due to the good reception status by the terrain, such as the tunnel outside the LOS of the satellite, the shaded area of the high-rise building, the underground space, etc. The poor reception state is referred to as a 'gap' and a device designed to improve reception by retransmitting a signal to the gap is called a 'gap filler'.

If the user moves in a vehicle or the like, in order to seamlessly provide the digital multimedia broadcasting service in a receiving apparatus, a gap filler device in addition to the satellite may be required to properly watch the digital multimedia broadcasting.

However, there is a problem that attaching an expensive gap filler device to each receiving device (terminal) is inefficient.

In addition, when moving as described above, in the transition region, signals received through two antennas are likely to interfere with each other, resulting in deterioration of reception performance.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a receiving apparatus and method capable of receiving digital multimedia broadcasting without interruption on the go.

Another object of the present invention is to provide an apparatus capable of improving reception performance in a transition region of a satellite signal and a gap filler signal.

In order to achieve the above object, the digital multimedia broadcasting receiving apparatus according to the present invention comprises: a satellite antenna for receiving a signal transmitted from a satellite; A gap filler antenna for receiving a signal transmitted from a ground gap filler; A control unit for generating a signal to be transmitted to a terminal using the signals received through the two antennas; A transmitter for transmitting a signal generated by the controller to a terminal; It is configured to include a terminal for receiving and reproducing a signal from the transmitter.

In this case, the control unit, an adder for adding a signal received through the satellite antenna and the gap filler antenna; It is preferably configured to include an amplifier for amplifying the added signal.

In the digital multimedia broadcasting receiving apparatus according to the present invention, the control unit having the structure of claim 2, the control unit comprising: a switch unit for turning on / off a signal received through the gap filler antenna; It further comprises a controller for controlling the on / off of the switch unit according to the magnitude of the gap filler signal.

Preferably, the controller is a device capable of generating a control signal directly like the terminal and the terminal.

Here, the controller preferably measures the power of the signal received through the gap filler antenna on a finger basis to turn on / off the switch unit.

At this time, the terminal, it is preferable to use a wired or wireless means to generate a control signal for the on / off of the switch unit and to transmit to the control unit.

A digital multimedia broadcasting receiving method according to the present invention is a digital multimedia broadcasting receiving method in a receiving apparatus having a terminal, a satellite antenna and a gap filler antenna installed separately from the terminal, the digital multimedia broadcasting receiving method of the digital multimedia through the satellite antenna and the gap filler antenna A first step of receiving a broadcast; Controlling an output of a signal received by the gap filler antenna according to the magnitude of the gap filler signal; The satellite antenna received signal outputted through the first step includes a third step of adding, amplifying and transmitting the gap filler antenna received signal outputted through the second step to the terminal.

Here, as a method of blocking a signal of a gap filler antenna, the second step includes: (a) extracting a unique number of a signal received from the terminal using pilot information in units of fingers; (b) determining whether a received signal is a gap filler signal using the extracted unique number; (c) if the gap filler signal is a result of the determination, determining whether the power is equal to or less than a predetermined level by measuring the power; (d) preferably further comprising the step of not outputting a signal received from the gap filler antenna when the result of the determination of step c is below a predetermined level.

In the step (d), the gap filler signal may be output if the gap filler signal received as a result of the determination of the step (c) is greater than or equal to a predetermined level.

Other objects, features and advantages of the present invention will become apparent from the following detailed description of embodiments taken in conjunction with the accompanying drawings.

In addition, the terms used in the present invention was selected as a general term widely used as possible now, but in certain cases, the term is arbitrarily selected by the applicant, in which case the meaning is described in detail in the corresponding description of the invention, It is to be clear that the present invention is to be understood as the meaning of terms rather than names.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of a digital multimedia broadcasting receiver and device according to the present invention will be described in detail with reference to the accompanying drawings.

First, the stationary satellite over the equator transmits a CDM signal having an S-band of 2.630 to 2.655 GHz to provide digital multimedia broadcasting services to mobile and fixed terminals.

In this case, the basic coverage of the satellite digital multimedia broadcasting service becomes the whole of Korea where the satellite can be secured by Line of Sight (LOS), and because of the characteristics of the geostationary satellite located above the equator, the building or the terrain Covered with the object, the satellite does not secure the LOS, that is, the shadow area that the satellite signal does not reach properly occurs.

Therefore, the gap filler device is used as described above to provide digital multimedia broadcasting service even in the shadowed area, that is, to secure coverage.

However, when traveling between the city center and the suburbs by using a vehicle, a train, etc., it is necessary to receive both the signal transmitted from the satellite and the signal transmitted from the gap filler due to the characteristics of the city and the suburbs. The multimedia broadcasting service may be provided.

However, since the signal transmitted from the satellite and the signal transmitted from the gap filler cannot be received by one antenna because polarization is different from each other, both the satellite antenna and the gap filler antenna should be installed.

However, in order to properly receive and watch digital multimedia broadcasting between mobile devices, satellite antennas and gap filler antennas should be installed in each terminal. However, since the gap filler is expensive, it is inefficient to install each terminal.

Thus, a new receiver is proposed to improve the above problems.

Referring to the accompanying drawings, FIG. 1 is a conceptual block diagram illustrating a digital multimedia broadcasting receiver according to the present invention.

Referring to FIG. 1, first, the receiving device does not have the gap filler antenna 110 installed in the terminal 140, but it can be seen that a separate device is used.

That is, the receiving apparatus includes a satellite antenna 100 for receiving a signal transmitted from a satellite, a gap filler antenna 110 for receiving a transmission signal of a gap filler installed to compensate for reception in a shaded area, and the two It is composed of a control unit 120 having a module for transmitting a signal received from the antenna to the terminal 140 to display and a transmitter 130 for transmitting the signal passed through the control unit 120 to the terminal 140 have.

When the receiving device is constructed as shown in FIG. 1, even when the user moves between the city center and the outside area by using a vehicle, the user can effectively receive both the gap filler signal and the satellite signal and receive the digital multimedia broadcasting service. In the case where a large number of people, such as a train, use the service at the same time, a plurality of people may be provided with the service from the transmitter 130 of the receiving device, so that the gap filler antenna 110 is installed in the terminal 140. It is much more efficient.

In this case, since the receiving device receives the satellite signal and the gap filler signal having different polarizations from each other at the same time, it is necessary to control the two signals properly so that the terminal 140 can watch the digital multimedia broadcasting properly.

Herein, a detailed description will be given of the control unit 120 which plays the above-mentioned control role in the receiving device. FIG. 2 is a block diagram illustrating an internal configuration of the control unit 120 of the receiving device according to the present invention.

The control unit 120 is composed of an adder 210 and an amplifier 220. The adder 210 sums a signal received through the gap filler antenna 110 and a signal received through the satellite antenna 100. The amplifier 220 is weak in strength of the sum of the signals added by the adder 210, so that it is difficult to properly decode them in the terminal 140 to watch digital multimedia broadcasting. Amplify to a signal of sufficient magnitude to decode.

The amplified signal is transmitted to the terminal 140 through the transmitter 130 and reproduced normally in the terminal.

Using the above-described receiving apparatus, the digital multimedia broadcasting can be seamlessly watched even while traveling between the downtown and the outlying areas.

That is, even when the gap filler signal and the satellite signal are received together in the downtown area, since the gap filler signal has a stronger reception strength than the satellite signal, the terminal 140 will be operated by the gap filler signal. Since there is no need of a gap filler, there is no gap filler, so the satellite signal is mainly used, and thus the terminal 140 is operated by the satellite signal.

However, in the transition region of the gap filler signal and the satellite signal, the satellite signal has a uniform but relatively weak reception intensity in the entire region, and the gap filler signal is far from the gap filler and thus has a weak reception strength so that the strengths of the two signals are different from each other. It may be similar to act as interference to each other, if interference occurs, it is difficult for the terminal 140 to properly receive digital multimedia broadcasting.

Accordingly, another object of the present invention is to provide an apparatus and method for improving the reception performance of the reception device so that the reception device can properly receive the digital multimedia broadcasting in the transition region. do.

Looking at a preferred embodiment according to the present invention with reference to the accompanying drawings, Figure 3 is a view showing a preferred embodiment to improve the reception performance in the transition region according to the present invention.

Satellite and gap fillers have their own unique numbers. Therefore, the signal transmitted from the satellite and the gap filler is transmitted along with the unique number, and the receiver extracts the unique number in the pilot information on a finger basis to determine whether the received signal is a satellite signal or a gap filler signal. Done.

At this time, if it is determined that the satellite signal is a satellite signal, the power of the gap filler signal received together is measured to determine whether the power of the gap filler signal is lower than or equal to a predetermined level set in the receiving apparatus. If the power of the galeller signal is below a certain level, the signals transmitted in the gap filler are more likely to act only as interference to the satellite signal.

Therefore, in the above case, the gap filler signal, which acts as an interference between the two signals, must be blocked so that the terminal 140 can receive the correct signal to watch the digital multimedia broadcasting.

To this end, it is necessary to block a gap filler signal received through the gap filler antenna 110 by generating an arbitrary control signal in the controller 120 or the terminal 140.

Therefore, when the switch unit 320 is blocked to turn on / off the antenna 110 through the gap filler antenna 110 to the adder 210 by using the control signal, the receiver is switched in the transition region. In the case of receiving digital multimedia broadcasting by using the above, reception performance can be greatly improved.

In FIG. 3, the switch unit 320 is controlled by having a reference receiver 310 as a device capable of generating a control signal in the controller 120.

That is, as described above, the reference receiver 310 determines whether the intensity of the signal received through the gap filler antenna 110 is less than or equal to a predetermined level set in the receiving device, and generates a control signal to turn on / off the switch unit 320. By turning off, the gap filler signal can be added or removed to improve reception performance.

In the above view, there may be a section in which the gap filler signal is larger than the satellite signal or a section in the transition region. Therefore, even in the transition region, the gap filler antenna is not turned off to use the gap filler signal if it is higher than the predetermined reference value set in the receiving device. Since the gap filler signal may act as interference, a control signal is transmitted from the reference receiver 310 to turn off the gap filler antenna 110 in order to eliminate the gap filler signal.

Referring to FIG. 4, a second embodiment of an apparatus for improving reception performance in a transition region according to the present invention will be described. At this time, the basic configuration of the second embodiment is the same as the first embodiment described above. However, in the second embodiment, unlike the first embodiment described above, the wired transceiver 410 is used to use the control signal generated by the terminal 140 in place of the reference receiver 310 installed inside the control unit 120. , 420 is used as a component.

That is, FIG. 4 is a block diagram illustrating another embodiment for improving reception performance in a transition region of a satellite and a gap filler signal when receiving a digital multimedia broadcast using the reception device according to the present invention.

4 is to transmit a control signal from the terminal 140 with reference to FIG. 3, using a wired means as a means for this.

That is, instead of separately installing the reference receiver 310 as a suitable controller capable of generating a control signal as shown in the terminal 140 of FIG. 4, the terminal 140 is used to use the control signal generated from the terminal 140. ) And a device using a wired means, for example, a USB (Universal Serial Bus), etc., for this purpose, a wired transmitter 420 is installed in the terminal 140 and a receiving device The control unit 120 of the control unit 120 is provided with a wired receiver 510 capable of receiving the control signal to receive a control signal directly from the terminal 140 to control the switch unit 320.

Referring to FIG. 5, a third embodiment according to the present invention will be described. At this time, the basic configuration of the third embodiment is the same as the first embodiment described above. However, in the third embodiment, unlike the first embodiment described above, the control signal is received from the terminal 140 instead of the reference receiver 310 installed inside the control unit 120 of the receiving apparatus. Unlike the second embodiment, there is a difference in that the control signal generated from the terminal 140 is transmitted and received using a wireless means rather than a wired means.

That is, FIG. 5 is a block diagram illustrating still another embodiment for improving reception performance in a transition region of a satellite and a gap filler signal when receiving a digital multimedia broadcast using the reception device according to the present invention.

5 illustrates the same function as the reference receiver 310 of FIG. 3 and the wired receiver 410 of FIG. 4.

For example, by directly receiving from the terminal 140 through a wireless transceiver (IR, etc.), the switch unit 320 is directly controlled.

Referring now to the accompanying flowchart of a method for improving reception performance in the reception apparatus, FIG. 6 illustrates an improvement in reception performance in a transition region of a satellite and a gap filler signal when receiving a digital multimedia broadcast using the reception apparatus according to the present invention. It is a flow chart showing a method for making it.

First, the digital multimedia broadcasting signal is received through the gap filler antenna 110 and the satellite antenna 100 (step S10).

In the receiving device receiving the signal, the signal received through the two antennas 100 and 110 is added by the adder 210 and amplified to make a signal enough for the terminal 140 to receive, and then, to the terminal 140. Transmit (S20).

In step S 10 and 20, the digital multimedia broadcasting signal can be seamlessly watched between the city center and the surrounding area. However, as described above, the reception performance may be degraded in the transition region of the downtown and the outer region. The method for this will be described below.

In operation S30, a unique number of the received signal is extracted using pilot information received in units of fingers from the signal received by the terminal 140 (S30).

Since both the satellite and the gap filler have a unique number, it is determined whether the received signal is a signal transmitted from the satellite or a signal received from the gap filler using the extracted unique number (step S40).

If the received signal is a signal received from the satellite as a result of the determination, there is no need to generate a control signal in the terminal 140 to control the receiving device, so the received signal may be reproduced in the terminal 140 as it is.

However, as a result of the determination, if the received signal is a signal received from the gap filler, the signal may act as interference of the satellite signal. For this, the power of the received signal is measured (step S50).

As a result of the power measurement, if the predetermined level or more is set in the receiving device, it is unlikely to act as an interference to the satellite signal, so there is no need to control the receiving device separately.

However, if the result of the power measurement is less than a predetermined level set in the receiving device, it acts as an interference to the satellite signal, so it is necessary to control the receiving device in order to remove it and improve the performance of the receiving device.

That is, in order to turn off the gap filler antenna of the receiving apparatus, the terminal 140 generates a control signal and transmits the control signal to the control unit 120 of the receiving apparatus (step S60).

When receiving the control signal, the receiving apparatus turns off the switch unit 320 connected to the gap filler antenna 110 by using the control signal in the receiving unit installed inside the control unit 120 through the gap filler antenna 110. The reception performance is improved by removing the gap filler signal that is received to prevent interference in advance (S70).

Although the above-described method has been described in the case of using the control signal generated in the terminal 140 in FIGS. 4 and 5, as shown in FIG. 3, the reference receiver generates a control signal in the control unit 120 as in the terminal 140. In the case of using the 310, determining whether the signal received in the step is a satellite signal or a gap filler signal, and if the gap filler signal is a result of the determination, the power of the received signal is measured and is below a predetermined level set in the receiving device. The determining is performed by the reference receiver 310 rather than the terminal 140.

Thus, when it is determined that the gap filler signal having a power of a predetermined level or less is received, the reference receiver 310 generates a control signal.

As described above, using the digital multimedia broadcasting receiver according to the present invention has the following advantages.

First, according to the present invention, even when moving between a downtown and a suburban area using a vehicle, the satellite signal and the gap filler signal can be effectively used.

Second, according to the present invention, there is no need to construct a gap filler device in a terminal, and only one gap filler antenna of a receiving device can be installed to be used by several people, thereby increasing efficiency.

Third, according to the present invention, the reception performance can be greatly improved by blocking the inflow of a signal that may cause interference even in a transition region where the satellite signal and the gap filler signal may interact with each other.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

Claims (9)

A satellite antenna for receiving a signal transmitted from a satellite; A gap filler antenna for receiving a signal transmitted from a ground gap filler; A control unit for generating a signal to be transmitted to a terminal using the signals received through the two antennas; A transmitter for transmitting a signal generated by the controller to a terminal; And a terminal for receiving and reproducing a signal from the transmitter. The method of claim 1, wherein the control unit, An adder for adding signals received through the satellite antenna and the gap filler antenna; And an amplifier for amplifying the added signal. A control unit having the structure of claim 2 in a digital multimedia broadcasting receiving apparatus, A switch unit for turning on / off a signal received through the gap filler antenna; And a controller for controlling on / off of the switch unit according to the magnitude of the gap filler signal. The method of claim 3, wherein the controller, A control device used in a digital multimedia broadcasting receiving device, characterized in that the terminal and the device capable of generating a control signal directly like the terminal. The method of claim 4, wherein And the controller measures power of a signal received through a gap filler antenna in units of fingers to turn on / off the switch unit. The method of claim 4, wherein the terminal, And a wired or wireless means for generating a control signal for on / off of the switch unit and transmitting the control signal to a control unit. A digital multimedia broadcasting receiving method in a receiving apparatus having a terminal, and a satellite antenna and a gap filler antenna installed separately from the terminal, Receiving a digital multimedia broadcasting through the satellite antenna and the gap filler antenna; Controlling an output of a signal received by the gap filler antenna according to the magnitude of the gap filler signal; And a third step of adding, amplifying, and transmitting the satellite antenna received signal output through the first step to the terminal by adding the gap filler antenna received signal output through the second step. The method of claim 7, wherein the second step, (a) extracting a unique number of a signal received by the terminal using pilot information in units of fingers; (b) determining whether a received signal is a gap filler signal using the extracted unique number; (c) if the gap filler signal is a result of the determination, determining whether the power is equal to or less than a predetermined level; and (d) not outputting a signal received from the gap filler antenna when the result of the determination of step c is less than or equal to a predetermined level. The method of claim 8, wherein step (d) comprises: And outputting the gap filler signal if the gap filler signal received as a result of step (c) is greater than or equal to a predetermined level.

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