KR20140127109A - An apparatus for receiving a digital broadcasting signal and therefore method - Google Patents

An apparatus for receiving a digital broadcasting signal and therefore method Download PDF

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Publication number
KR20140127109A
KR20140127109A KR1020130045722A KR20130045722A KR20140127109A KR 20140127109 A KR20140127109 A KR 20140127109A KR 1020130045722 A KR1020130045722 A KR 1020130045722A KR 20130045722 A KR20130045722 A KR 20130045722A KR 20140127109 A KR20140127109 A KR 20140127109A
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KR
South Korea
Prior art keywords
signal
reception
digital
receiving
received
Prior art date
Application number
KR1020130045722A
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Korean (ko)
Inventor
정영호
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한국항공대학교산학협력단
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Priority to KR1020130045722A priority Critical patent/KR20140127109A/en
Publication of KR20140127109A publication Critical patent/KR20140127109A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/414—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance
    • H04N21/41422—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance located in transportation means, e.g. personal vehicle
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/426—Internal components of the client ; Characteristics thereof
    • H04N21/42607—Internal components of the client ; Characteristics thereof for processing the incoming bitstream
    • H04N21/4263—Internal components of the client ; Characteristics thereof for processing the incoming bitstream involving specific tuning arrangements, e.g. two tuners
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H2201/00—Aspects of broadcast communication
    • H04H2201/10—Aspects of broadcast communication characterised by the type of broadcast system
    • H04H2201/11—Aspects of broadcast communication characterised by the type of broadcast system digital multimedia broadcasting [DMB]

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

A digital broadcast signal receiving apparatus comprising: reception antennas for receiving signals; and a signal processing unit for processing signals received through the reception antennas, wherein the signal processing unit receives A delay unit for delaying the first signal by a predetermined unit time and outputting a delay signal, and a delay unit for delaying the second signal received through at least one remaining antenna except for the first reception antenna among the reception antennas, And a connection unit for outputting the sum signal to a tuner input terminal that supports the reception function of the digital broadcasting signal.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus and a method for receiving a digital broadcast,

The present invention relates to an apparatus and method for receiving digital broadcasts, and more particularly, to an apparatus and method for receiving digital broadcasts by connecting an external antenna or an internal tuner connectable through an external input terminal of a terminal supporting a digital broadcast receiving function, An antenna and a signal reception method therefor are proposed.

Recently, Digital Multimedia Broadcasting (DMB), which has been developed as a mobile multimedia broadcasting service, has emerged as a new generation of broadcasting technology that can conveniently view various high-quality / high- have. Such a DMB is classified into a satellite DMB using a satellite and a terrestrial DMB using a terrestrial repeater. The terrestrial DMB can be viewed through a portable terminal for receiving a DMB developed to receive a DMB such as a mobile phone PDA (Personal Digital Assistant) and a vehicle receiver.

Since the DMB service is provided in a mobile environment, the biggest challenge is to increase the reception ratio of the DMB. As a method for increasing the reception ratio of the DMB, there is a method of lengthening the length of the load antenna receiving the DMB. The rod antenna is relatively inexpensive in price, but it requires a sufficient space to accommodate the rod antenna because a sufficient length is required to improve the reception ratio. Alternatively, there is a method of reducing noise generated in the portable terminal through a separate device. This increases the volume of the terminal.

On the other hand, in the case of the terrestrial digital broadcasting mainly used in the home, the antenna input signal inputted through the hearing antenna is connected to the tuner input terminal of the TV from the terminal on the building wall, or the signal received through the indoor antenna is inputted to the tuner Connect to the input terminal to receive the broadcast. There is a problem that the existing public viewing device is installed exclusively for analog, re-installed to enable digital broadcast reception, or an indoor antenna must be used.

The present invention proposes an external antenna that can be connected through a tuner input terminal of a terminal supporting a digital broadcast receiving function and a signal reception method therefor.

An apparatus according to an embodiment of the present invention includes: A digital broadcast signal receiving apparatus comprising: reception antennas for receiving signals; and a signal processing unit for processing signals received through the reception antennas, wherein the signal processing unit receives A delay unit for delaying the first signal by a predetermined unit time and outputting a delay signal, and a delay unit for delaying the second signal received through at least one remaining antenna except for the first reception antenna among the reception antennas, And a connection unit for outputting the sum signal to a tuner input terminal that supports the reception function of the digital broadcasting signal.

A method according to an embodiment of the present invention comprises: A method for receiving a digital broadcast signal, the method comprising: delaying a first signal received through a first receive antenna by a predetermined unit time when it is detected that signals are received through the receive antennas; And outputs the sum signal to a tuner input terminal of a terminal supporting the reception function of the digital broadcasting signal, Output terminal.

The present invention provides an apparatus and a method for receiving a digital multimedia broadcasting (DMB) by an external antenna connected to an external input terminal of a portable terminal supporting at least two reception antennas, and delaying the reception signals for one or more reception antennas , Frequency diversity is increased for digital broadcasting based on OFDM (Orthogonal Frequency Division Multiplexing), and the same effect as that of Cyclic Delay Diversity (CDD) applied using a plurality of existing transmitter antennas is obtained, There is an effect of improving digital broadcast reception performance as compared with an external antenna that can be mounted on a terminal supporting the digital broadcast reception function. Also, through the external antenna according to the embodiment of the present invention, the broadcasting reception performance can be increased without changing the configuration of the existing digital broadcasting receiver.

1 is an example of a block diagram of an internal structure of an external antenna according to a first embodiment of the present invention,
2 is an example of a digital circuit diagram of a signal processing unit included in the external antenna according to the first embodiment of the present invention,
3 is a flowchart illustrating an operation of a signal processing unit of an external antenna according to the first embodiment of the present invention,
4 is a block diagram of an internal structure of an external antenna according to a second embodiment of the present invention.
5 is a flowchart illustrating an operation of a signal processing unit of an external antenna according to a second embodiment of the present invention.
6A is a graph illustrating an improvement in reception performance of a digital multimedia broadcasting signal when an external antenna is applied according to embodiments of the present invention,
6B is another example of a graph illustrating an improvement in reception performance of a digital multimedia broadcasting signal when an external antenna is applied according to embodiments of the present invention.

The operation principle of the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. The same elements shown in the drawings are denoted by the same reference numerals even though they are shown in different drawings. In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention unclear. The detailed description thereof will be omitted. The following terms are defined in consideration of the functions of the present invention, and these may be changed according to the intention of the user, the operator, or the like. Therefore, the definition should be based on the contents throughout this specification.

The present invention relates to a configuration of an external antenna that improves the reception performance of a terminal supporting digital broadcasting reception function based on OFDM such as DMB and terrestrial digital broadcasting (hereinafter, referred to as a 'digital broadcast receiver'), For example. The external antenna according to the embodiment of the present invention is connected to the digital broadcasting terminal through a tuner input terminal of a digital broadcasting receiver.

The external antenna according to the first embodiment of the present invention includes at least two reception antennas and sums the signals received through the at least two reception antennas and outputs the sum to the external antenna input terminal of the digital broadcasting receiver. At this time, the signal received through one of the two reception antennas is delayed by a predetermined unit time. Then, a sum of the signal to which the CDD is applied and the signal received through the remaining at least one reception antenna is summed and outputted to the external antenna input terminal of the digital broadcasting receiver. Hereinafter, embodiments of the present invention will be described on the assumption that an external antenna includes two reception antennas.

1 is an example of a block diagram of an internal structure of an external antenna according to the first embodiment of the present invention.

Referring to FIG. 1, an external antenna includes two reception antennas, that is, a reception antenna 1 102 and a reception antenna 2 104, and a signal processing unit 100. The signal processing unit 100 includes a delay unit 106 and a summation unit 108. The delay unit 106 delays the signal of the path 1 received through the receiving antenna 1 102 by a predetermined unit time and outputs the delayed signal to the summation unit 108. The summing unit 108 sums the signal of the path 1 and the signal of the path 2 received through the reception antenna 2 104 and outputs the sum to the external antenna input terminal 112 of the digital broadcast receiver 110. Although not shown in the drawing, the external antenna further includes a connection unit that is input to the external antenna input terminal 112.

The digital broadcasting receiver 110 may be a portable device supporting a digital broadcasting function such as a digital TV or a DMB, and may be, for example, a mobile communication terminal, a navigation system for a vehicle, a Portable Multimedia Player (PMP) have. The digital broadcast receiver 110 shown in FIG. 1 is connected to an external antenna according to an embodiment of the present invention. For convenience of explanation, the digital broadcast receiver 110 is shown in a simplified form including only configurations for receiving a digital broadcast signal. Accordingly, the digital broadcast receiver 110 includes an external antenna input terminal 112 to which the external antenna is connected, a tuner 114, a digital broadcast receiving modem 116, and a display unit 118 ).

2 is an example of a digital circuit diagram of a signal processing unit included in an external antenna according to the first embodiment of the present invention.

2, the signal processing unit 100 includes a signal processing unit 200 of a path 1, a signal processing unit 210 of a path 2, a DAC 222, a mixer 224, and a BPF (Band Pass Filler) 226).

The signal processing unit 200 of the path 1 received through the receiving antenna 1 102 includes a mixer 1 204, a low pass filter (LPF 1) 206, an ADC 1 208 and a delay unit 209 . The mixer 1 204 performs frequency conversion by mixing the carrier frequency f c with the signal of the path 1, which is a baseband frequency band signal, and outputs it to the LPF 1 206. The LPF1 206 passes only a signal corresponding to a predetermined frequency band to the signal of the frequency-converted path 1, and outputs the signal to the ADC1 208. [ The ADC1 208 converts an analog signal having passed through the LPF1 206 into a digital signal and outputs the digital signal to the delay unit 209. [ Then, the delay unit 209 outputs the signal of the digitally-converted path 1 to the summation unit 220.

The signal processing unit 100 includes a mixer 214 for the signal processing unit 210 of the path 2 received through the receive antenna 2 104 and an LPF 2 216 and an ADC 2 218. The signal of the path 2 is processed by the mixer 1 204 and the LPF1 206 and the ADC2 208 through the mixer 214 and the LPF2 216 and the ADC2 218, And then output to the summation unit 220. [0051]

Then, the summation unit 220 sums the signal of the path 1 input from the delay unit 209 and the signal of the path 2 output to the ADC 2 218, and outputs the sum to the DAC 222. The DAC 22 converts the summed digital signal into an analog signal and outputs it to the mixer 3 224. The mixer 3 224 performs frequency conversion by mixing the carrier frequency with the summed analog signal, and then outputs the resultant to the BPF 226. The BPF 228 passes a signal corresponding to a predetermined frequency band to the signal input from the mixer 3 224 and then transmits a signal having passed through the BPF to the outside of the digital broadcast receiver 110 And finally output to the antenna input terminal 112. Although not shown in FIG. 2, the signal processing unit 200 further includes a connection unit to be input to the tuner input terminal 112.

3 is a flowchart illustrating an operation of a signal processing unit of an external antenna according to the first embodiment of the present invention.

Referring to FIG. 3, in step 300, the signal processor detects that signals are received through receive antennas. In step 305, the signal processor confirms the path of the received signals. If the signal of the path 1 received through the reception antenna 1 among the received signals is confirmed, In step 310, the signal processing unit delays the signal of the path 1 by a predetermined unit time, and then proceeds to step 315. In step 315, If the received signal is the signal of the path 2 received through the receiving antenna 2, the signal processor outputs the signal of the path 2 to the adder in step 315.

In step 320, the signal processing unit checks whether the signal of the path 1 delayed by the predetermined unit time and the signal of the path 2 are both input to the summation unit. If the signal of path 1 delayed by the predetermined unit time and the signal of path 2 are not input to the summation unit as a result of the check, if the signal of path 1 delayed by the predetermined unit time and the signal of path 2 are all input to the summation unit . If the signal of path 1 and the signal of path 2 delayed by the predetermined unit time are all input to the adder, the signal processor proceeds to step 325. In step 325, the signal processor adds the signal of path 1 delayed by the predetermined unit time and the signal of path 2 to the summation part. In step 330, the signal processor outputs the summed signal to the tuner input terminal of the digital broadcasting receiver.

The external antenna according to the second embodiment of the present invention measures the power of each of the signals received through the two reception antennas and outputs a signal having a high measured power to the tuner input terminal of the digital broadcasting receiver.

4 is an example of a block diagram of an internal structure of an external antenna according to a second embodiment of the present invention.

Referring to FIG. 4, the external antenna includes two reception antennas, that is, a reception antenna 1 402 and a reception antenna 2 404, and a signal processing unit 400.

The signal processing unit 400 includes a power measuring unit 1 406, a power measuring unit 2 408, a control unit 410 and a switching unit 412.

The power measuring unit 1 406 measures the power of a signal of path 1 received through the receiving antenna 1 402 and outputs the measured power to the controller 410. Similarly, the power measuring unit 2 408 measures the power of the signal of the path 2 received through the receiving antenna 2 404 and outputs the measured power to the controller 410. Then, the controller 410 compares the signal power of the path 1 and the signal power of the path 2. As a result of the comparison, the switching unit 412 is controlled so as to be connected to a signal of a path having a large power and an external antenna input terminal 112 of the digital broadcast receiver 110. Then, the switching unit 412 outputs the signal of the corresponding path to the external antenna input terminal 112 according to the control signal of the controller 410. For example, if it is assumed that the signal power of the path 1 is greater than the signal power of the path 2, the control unit 410 instructs the control unit 410 to output the signal of the path 1 to the external antenna input terminal 112 And transfers the signal to the switching unit 412. The switching unit 412 outputs the signal of the path 1 to the external antenna input terminal 112 of the digital broadcast receiver 110 according to the control signal.

5 is an operational flowchart of a signal processing unit of an external antenna according to a second embodiment of the present invention.

Referring to FIG. 5, in step 500, the signal processor receives a signal through each of two reception antennas. In step 505, the signal processor measures the power of the received signals of the path 1 and the path 2, and compares the measured power magnitudes. In step 510, the signal processor controls the output of the signal of the path having the measured power size to the external antenna input terminal of the digital broadcast receiver.

6A is an example of a graph illustrating an improvement in reception performance of a digital broadcasting signal when an external antenna is applied according to embodiments of the present invention. 6A shows a case where a small number of external antennas are connected to an external antenna input terminal of a digital broadcast receiver to set a relatively small multipath for reception of a digital broadcast signal.

Referring to FIG. 6A, 'conventional' shows performance of an embodiment in which the same number of general external antennas are connected to an external antenna input terminal of a digital broadcast receiver. 1 and 2, the 'first embodiment' is constructed in accordance with the first embodiment of the present invention, that is, the external antennas implemented as shown in FIG. 1 or 2 have the same number of reception antennas, RTI ID = 0.0 > connected < / RTI > CDD-8, CDD-16, and CDD-24, respectively, when the number of samples of a predetermined unit time delayed by the delay unit is applied as 8, 16, and 24 samples, respectively, in the case of the first embodiment. 4, the 'second embodiment' is constructed in accordance with the second embodiment of the present invention, that is, the external antenna implemented as shown in FIG. 4 has the same number of reception antennas, RTI ID = 0.0 > connected < / RTI > In this case, the BER (Bit Error Rate) value for the DMB reception signal is relatively low in the first and second embodiments as compared with the conventional case. Therefore, it can be seen that the reception performance of the digital broadcasting signal is improved through the mounting of the external antenna according to the embodiments of the present invention.

6B is another example of a graph illustrating an improvement in reception performance of a digital broadcasting signal when an external antenna is applied according to embodiments of the present invention. 6B shows a case where a large number of external antennas are connected to an external antenna input terminal of a digital broadcasting receiver to set a relatively large multipath for reception of a digital broadcasting signal. Here, 'existing', 'first embodiment' and 'second embodiment' are the same as those described with reference to FIG. 6A, and redundant description will be omitted.

Referring to FIG. 6B, since the BER of the first and second embodiments of the present invention is relatively low as compared to the conventional one, the reception performance of the digital broadcasting signal is improved as in FIG. 6A. In the case of FIG. 6A in which a relatively small number of multipaths are set, the performance difference between the first embodiment and the second embodiment is not large. On the other hand, when setting a relatively high number of multipaths, It shows higher performance than the example.

By connecting the external antenna according to the embodiment of the present invention to the external antenna input terminal of the digital broadcasting receiver, it is possible to improve the reception rate of the DMB reception signal without changing the structure of the conventional digital broadcasting receiver.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but is capable of various modifications within the scope of the invention. Therefore, the scope of the present invention should not be limited by the illustrated embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

Claims (7)

A digital broadcast signal receiving apparatus comprising:
Receiving antennas for receiving signals,
And a signal processing unit for processing signals received through the reception antennas;
The signal processing unit,
A delay unit for delaying a first signal received through a first reception antenna among the reception antennas by a predetermined unit time and outputting a delay signal;
A summation unit for summing the delay signal and a second signal received through at least one remaining antenna except for the first reception antenna among the reception antennas;
And a connection unit for outputting the sum signal to a tuner input terminal that supports the reception function of the digital broadcast signal.
The method according to claim 1,
The digital broadcast signal receiving apparatus includes:
Wherein the tuner is an external antenna connected to a tuner input terminal of a terminal supporting the reception function of the digital broadcasting signal.
The method according to claim 1,
Wherein the number of the receiving antennas is two.
The method according to claim 1,
The signal processing unit,
A low pass filter (LPF), an analog-to-digital converter (ADC) connected to each of the first mixers, and a second delay circuit for delaying the first signal by a predetermined time A digital mixer, a DAC (Digital Analog Converter), a second mixer, and a BPF (Band Pass Filter).
A method for receiving a digital multimedia broadcasting (DMB) signal,
Delaying a first signal received through a first reception antenna by a predetermined unit time when it is detected that signals are received through the reception antennas,
If it is confirmed that all the signals corresponding to the reception antennas are received, summing the first signal and the remaining signals excluding the first signal among the signals, and adding the sum signal to the reception function of the digital broadcasting signal And outputting the digital broadcasting signal to a tuner input terminal of a supporting terminal.
6. The method of claim 5,
A method of receiving a digital broadcast signal,
Wherein the digital broadcast signal is received through an external antenna connected to a tuner input terminal of the terminal supporting a function of receiving the digital broadcast signal.
6. The method of claim 5,
Wherein the number of the receiving antennas is two.
KR1020130045722A 2013-04-24 2013-04-24 An apparatus for receiving a digital broadcasting signal and therefore method KR20140127109A (en)

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KR1020130045722A KR20140127109A (en) 2013-04-24 2013-04-24 An apparatus for receiving a digital broadcasting signal and therefore method

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Application Number Priority Date Filing Date Title
KR1020130045722A KR20140127109A (en) 2013-04-24 2013-04-24 An apparatus for receiving a digital broadcasting signal and therefore method

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