KR20130080570A - Apparatus and method for channel tuning use the spreading signal in digital broadcasting system - Google Patents

Abstract

The present invention proposes an apparatus and method for channel searching using spread spectrum in a digital broadcasting system. The search method according to the embodiment receives a received signal in a corresponding band for each of the channels included in the channel list, synchronizes and despreads the received signal, and then detects whether a pilot signal is included and detects a pilot signal. The selected channel.

Description

Apparatus and method for channel tuning use the spreading signal in Digital broadcasting system}

The present invention relates to automatic channel setting of a receiver, and more particularly, to a method of receiving a channel change information without a user's separate operation while a receiver receiving a movement moves out of a corresponding region to another region.

Terrestrial-digital multimedia broadcasting ("T-DMB") is a broadcasting system that adds multimedia broadcasting service including video service to Eureka 147 based digital audio broadcasting (DAB) system in Europe. By using the method for transmitting the DMB broadcast signal to the mobile receiver. The T-DMB uses a bandwidth of 1.5 MHz, has a channel rate of about 1 Mbps, and performs mobile multimedia broadcasting with CIF (Common Interleaved Frame) quality.

In general, a T-DMB receiver has a disadvantage in that a channel search is possible only when the T-DMB receiver having a GPS receiver knows the current position. In other words, automatic channel search is not possible in a T-DMB receiver without a GPS receiver.

An embodiment of the present invention provides an apparatus and method for channel searching using spread spectrum in a digital broadcasting system.

An embodiment of the present invention provides a method for automatically setting a channel in a moving receiving apparatus by spreading a pilot signal on a transmission signal and transmitting the same in a same band.

In a digital broadcasting system according to an embodiment of the present invention, a transmission device for transmitting a spread spectrum signal for channel search includes a pilot generation unit for generating a predetermined pilot signal, and spreading the spectrum by spreading the pilot signal. And a band spreader for generating a pilot signal, a modulator for generating a spread modulated pilot signal by modulating the spread spectrum pilot signal, and a signal synthesizer for synthesizing the spread modulated pilot signal with a modulated broadcast signal.

In a digital broadcasting system according to an embodiment of the present invention, a channel search apparatus using spread spectrum includes: a synchronization unit for synchronizing when receiving a received signal in a band corresponding to a selected channel among channels included in a channel list; A despreader for extracting a despread signal by despreading a received signal to which the signal is matched, a detector for detecting whether a pilot signal is included in the despread signal, and a pilot for all channels included in the channel list And a channel selector for checking whether a signal is detected and selecting a channel in which a pilot signal is detected.

In this case, the channel selector may select a channel currently connected when there are two or more channels in which the pilot signal is detected.

In this case, when there are two or more channels from which the pilot signal is detected, the channel selector may select a channel by a predetermined method.

Here, the predetermined method may include a method of considering a location of the receiving device, a method of considering a moving path of the receiving device, a method of considering a channel to which the receiving device mainly connects, and a setting of a user of the receiving device. At least one of the methods according to the priority may be used.

In this case, the apparatus may further include a channel estimator for estimating a channel using the pilot signal and a channel compensator for channel compensation using channel estimation information of the channel estimator.

In this case, the channel selection unit may perform the selection of the channel at a predetermined time interval or when a request for identifying a reception radio wave environment occurs.

In a digital broadcasting system according to an embodiment of the present invention, a transmission method for transmitting a spread spectrum signal for channel search includes generating a preset pilot signal and spreading the spread spectrum signal by spreading the pilot signal. Generating a signal; modulating the spread spectrum pilot signal into a spread modulated pilot signal, and synthesizing the spread modulated pilot signal with the modulated broadcast signal.

In a digital broadcasting system according to an embodiment of the present invention, a channel search method using spread spectrum includes selecting a channel not searched from among channels included in a channel list, and receiving a received signal in a band corresponding to the selected channel. Synchronizing the received signal; extracting the despread signal by despreading the synchronized received signal; detecting whether the despread signal includes a pilot signal; and selecting the channel. In the step of performing the detecting step for all the channels included in the channel list and to check whether the pilot signal is detected for all the channels included in the channel list to select the channel from which the pilot signal is detected Steps.

In this case, in the selecting of the channel, when two or more channels in which the pilot signal is detected may be selected, a channel currently connected.

In this case, the selecting of the channel may include selecting a channel by a predetermined method when two or more channels are detected.

Here, the predetermined method may include a method of considering a location of the receiving device, a method of considering a moving path of the receiving device, a method of considering a channel to which the receiving device mainly connects, and a setting of a user of the receiving device. At least one of the methods according to the priority may be used.

In this case, the channel search apparatus estimates a channel using the pilot signal; And performing channel compensation using the channel estimation information of the channel estimator.

In this case, the selecting of the channel in the selecting of the channel may be performed when the selection of the channel is performed at a predetermined time interval or when a request for identifying a reception propagation environment occurs.

The present invention relates to an apparatus and method for automatically setting a channel in a moving receiver by spreading a pilot signal on a transmission signal and transmitting the same in a same band. By grasping the channel information can be obtained automatically. It is possible to search and automatically tune the band information to be received without assigning the same pilot signal to each transmitter.

1 is a block diagram illustrating a configuration of a transmitter for spreading a pilot signal by spreading a pilot signal and combining the broadcast signal with a broadcast signal according to an embodiment of the present invention;
2 is a block diagram illustrating a configuration of a receiver for searching for a channel by extracting a pilot signal through despreading for each channel in a digital broadcasting system according to an embodiment of the present invention;
3 is a diagram illustrating an example in which a plurality of channels are searched according to movement in a receiving device of the present invention;
4 is a flowchart illustrating a process of spreading a pilot signal by spreading a pilot signal and combining the broadcast signal with a broadcast signal according to an embodiment of the present invention;
5 is a flowchart illustrating a process of searching for a channel by extracting a pilot signal through despreading for each channel in a receiving apparatus of a digital broadcasting system according to an exemplary embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating a configuration of a transmitter for spreading a pilot signal by spreading a pilot signal and combining the broadcast signal with a broadcast signal according to an embodiment of the present invention.

Referring to FIG. 1, a transmitting apparatus includes an encoder 110, a multiplexer 112, a first modulator 114, a pilot generator 120, a band spreader 122, and a second modulator 124. , A signal synthesizer 126, a frequency uplinker 130, and an amplifier 132.

The encoder 110 encodes an input service source (audio or video).

The multiplexer 112 multiplexes the encoded service source.

The first modulator 114 modulates the multiplexed service source.

The pilot generator 120 generates a preset pilot signal.

The spread spectrum unit 122 spreads the pilot signal using a predetermined spreading code to generate a spread spectrum pilot signal.

The second modulator 124 modulates the spread spectrum pilot signal to generate a spread modulated pilot signal.

The signal synthesizer 126 combines the spread modulated pilot signal generated by the second modulator 124 with the service source modulated by the first modulator 114.

The frequency upr 130 frequency ups the signal synthesized by the signal synthesizer 126.

The amplifier 132 broadcasts the frequency up signal through the antenna.

2 is a diagram illustrating a configuration of a receiver for searching for a channel by extracting a pilot signal through despreading for each channel in a digital broadcasting system according to an exemplary embodiment of the present invention.

Referring to FIG. 2, the receiving apparatus includes a DMB service unit 210 and a channel search unit 220.

In this case, the DMB service unit 210 includes a T-DMB receiver 211, a T-DMB synchronizer 212, a demodulator 213, a service selector 214, a deinterleaving and channel decoder 215, and a service. It may include a decoder 220.

The T-DMB receiver 211 receives a T-DMB signal through an antenna.

The T-DMB synchronizer 212 synchronizes the T-DMB signal.

The demodulator 213 demodulates the synchronized T-DMB signal. In this case, the demodulator 216 may perform channel estimation and channel compensation using the pilot signal searched by the included channel searcher 220.

The service selector 214 selects a service to be provided.

The deinterleaving and channel decoding unit 215 deinterleaves the demodulated T-DMB signal, decodes the channel, and outputs data corresponding to the selected service to the service decoding unit 216.

The service decoder 220 decodes and outputs the service data.

The channel search unit 220 may include a synchronizer 221, a despreader 222, a detector 223, and a channel selector 224.

The synchronization unit 221 synchronizes when the reception signal is received in a band corresponding to the selected channel among the channels included in the channel list.

The despreader 222 extracts the despread signal by despreading the synchronized reception signal by using a spread signal predetermined for each channel.

The detector 223 detects whether the pilot signal is included in the despread signal.

The channel selector 224 checks whether the pilot signal is detected for all the channels included in the channel list and selects a channel where the pilot signal is detected.

The channel selector 224 may select a channel currently connected or select a channel corresponding to the detected pilot signal when two or more channels are detected.

The channel selector 224 may select an arbitrary channel from the searched channels or select a channel by a predetermined method when two or more channels are detected.

Here, the predetermined method may include a method of considering a location of a receiving device, a method of considering a moving path of a receiving device, a method of considering a channel mainly connected to a receiving device, a method according to a priority set by a user of a receiving device, and the like. There is this.

Meanwhile, the channel selector 224 may perform channel selection at predetermined time intervals or when a request for identifying a reception radio wave environment occurs.

3 is a diagram illustrating an example in which a plurality of channels are searched according to movement in a receiving device of the present invention.

Referring to FIG. 3, when the receiver moves from cell A to cell C through cell B, it may be checked whether a pilot signal for each channel is detected.

When the receiver is located in the A cell, it can be confirmed that only the pilot signal corresponding to the A channel is obtained as a result of autocorrelation for each channel through despreading.

When the receiver is in the overlapping region of the A-cell and the B-cell, it can be confirmed that the pilot signals corresponding to the A and B channels are obtained as a result of autocorrelation for each channel through despreading. In this case, the receiving apparatus selects the A channel.

When the receiver is in the overlapping region of the A cell, the B cell, and the C cell, it can be confirmed that the pilot signals corresponding to the A, B, and C channels are obtained as a result of autocorrelation for each channel through despreading. Also in this case, the receiving apparatus selects the A channel.

According to the movement, when the receiving device is in the overlapping region of the B cell and the C cell, it can be confirmed that the pilot signals corresponding to the B channel and the C channel are obtained as a result of autocorrelation for each channel through despreading. In this case, the receiver first selects the searched B channel.

Finally, when the receiver is located in the C cell, it can be seen that only the pilot signal corresponding to the C channel is obtained as a result of autocorrelation for each channel through despreading. In this case, the receiving apparatus selects the A channel.

Hereinafter, in the digital broadcasting system according to the present invention configured as described above, a spreading signal type pilot signal is additionally transmitted to a digital broadcasting signal, and a receiving device searches for and selects a channel by despreading a received signal for each channel and extracting a pilot signal. How to do this will be described with reference to the drawings below.

4 is a flowchart illustrating a process of spreading a pilot signal by spreading the pilot signal and combining the broadcast signal with a broadcast signal according to an exemplary embodiment of the present invention.

Referring to FIG. 4, the transmitter generates a preset pilot signal in step 410.

In operation 420, the transmitting apparatus spreads the pilot signal using a predetermined spreading code to generate a spread spectrum pilot signal.

In operation 430, the transmitter modulates the spread spectrum pilot signal into a spread modulated pilot signal.

In operation 440, the transmitter combines the spread modulated pilot signal with the modulated broadcast signal, frequency ups the amplified signal, and amplifies the broadcast signal.

5 is a flowchart illustrating a process of searching for a channel by extracting a pilot signal through despreading for each channel in a receiving apparatus of a digital broadcasting system according to an exemplary embodiment of the present invention.

Referring to FIG. 5, the receiving apparatus checks whether a channel search event occurs in step 510. The channel search event may occur at predetermined time intervals or may be generated according to a request for identifying a reception propagation environment.

If the channel search event occurs as a result of checking in step 510, the receiving apparatus in step 512

Select a channel not searched among the channels included in the channel list.

In operation 514, the reception apparatus receives and synchronizes the reception signal in a band corresponding to the selected channel.

In operation 516, the receiving apparatus despreads the received signal synchronized with each other by using a spread signal preset for each channel to extract the despread signal.

In operation 518, the receiving apparatus detects whether the pilot signal is included in the despread signal.

In operation 520, the receiving apparatus checks whether all channels included in the channel list have been searched.

If it is determined in step 520 that not all channels have been searched, the receiver returns to step 512 and repeats the subsequent process.

In operation 520, when all channels are searched, the receiving apparatus determines whether the pilot signal is detected for all the channels included in the channel list and selects a channel where the pilot signal is detected. In this case, when two or more channels are detected by the pilot signal, the receiving device may select a channel currently connected or select a channel corresponding to the first detected pilot signal. In this case, when there are two or more channels in which the pilot signal is detected, the receiving apparatus may select an arbitrary channel from the found channels or select a channel by a predetermined method. Here, the predetermined method may include a method of considering a location of a receiving device, a method of considering a moving path of a receiving device, a method of considering a channel mainly connected to a receiving device, a method according to a priority set by a user of a receiving device, and the like. There is this.

The methods according to embodiments of the present invention may be implemented in the form of program instructions that can be executed through various computer means and recorded in a computer-readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. The program instructions recorded on the medium may be those specially designed and constructed for the present invention or may be available to those skilled in the art of computer software.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above embodiments, and those skilled in the art to which the present invention pertains various modifications and variations from such descriptions. This is possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the equivalents of the claims, as well as the claims.

Claims (14)

A pilot generation unit generating a preset pilot signal;
A band spreader which spreads the pilot signal to generate a spread spectrum pilot signal;
A modulator configured to generate a spread modulated pilot signal by modulating the spread spectrum pilot signal; And
And a signal synthesizer for synthesizing the spread modulated pilot signal to a modulated broadcast signal.
A transmitter for transmitting a spread spectrum pilot signal for channel search in a digital broadcasting system.
A synchronization unit for synchronizing when receiving the received signal in a band corresponding to the selected channel among the channels included in the channel list;
A despreader which despreads the synchronized reception signal and extracts the despread signal;
A detector detecting whether a pilot signal is included in the despread signal; And
A channel selector configured to check whether a pilot signal is detected for all channels included in the channel list and to select a channel where a pilot signal is detected;
Channel search apparatus using spread spectrum in digital broadcasting system.
The method of claim 2,
The channel selector,
When there are two or more channels in which the pilot signal is detected,
To select the currently connected channel
Channel search apparatus using spread spectrum in digital broadcasting system.
The method of claim 2,
The channel selector,
When there are two or more channels in which the pilot signal is detected,
Characterized in that the channel is selected in a predetermined manner.
Channel search apparatus using spread spectrum in digital broadcasting system.
5. The method of claim 4,
The predetermined method is
Considering the position of the receiving device,
A method of considering a moving path of the receiving device;
A method of considering a channel to which the receiving device mainly connects,
Using at least one of the methods according to the priority set by the user of the receiving device,
Channel search apparatus using spread spectrum in digital broadcasting system.
The method of claim 2,
A channel estimator for estimating a channel using the pilot signal; And
And a channel compensator for performing channel compensation using the channel estimation information of the channel estimator.
Channel search apparatus using spread spectrum in digital broadcasting system.
The method of claim 2,
The channel selector,
Selecting the channel at predetermined time intervals or when a request for identifying a reception radio wave environment occurs
Channel search apparatus using spread spectrum in digital broadcasting system.
Generating a preset pilot signal;
Spreading the pilot signal to generate a spread spectrum pilot signal;
Modulating the spread spectrum pilot signal into a spread modulated pilot signal; And
Synthesizing the spread modulated pilot signal with a modulated broadcast signal;
A transmission method for transmitting a spread spectrum pilot signal for channel search in a digital broadcasting system.
Selecting a channel not searched among channels included in the channel list;
Receiving and synchronizing a received signal with a band corresponding to the selected channel;
Despreading the synchronized reception signal to extract the despread signal;
Detecting whether a pilot signal is included in the despread signal;
Performing the detecting in the selecting of the channel to all channels included in the channel list; And
Checking whether a pilot signal is detected for all channels included in the channel list, and selecting a channel where a pilot signal is detected;
Channel search method using spread spectrum in digital broadcasting system.
10. The method of claim 9,
Selecting the channel,
When there are two or more channels in which the pilot signal is detected,
To select the currently connected channel
Channel search method using spread spectrum in digital broadcasting system.
10. The method of claim 9,
Selecting the channel,
When there are two or more channels in which the pilot signal is detected,
Characterized in that the channel is selected in a predetermined manner.
Channel search method using spread spectrum in digital broadcasting system.
The method of claim 11,
The predetermined method is
Considering the position of the receiving device,
A method of considering a moving path of the receiving device;
A method of considering a channel to which the receiving device mainly connects,
Using at least one of the methods according to the priority set by the user of the receiving device,
Channel search method using spread spectrum in digital broadcasting system.
10. The method of claim 9,
Estimating a channel using the pilot signal; And
Compensating a channel using the channel estimation information of the channel estimator.
Channel search method using spread spectrum in digital broadcasting system.
10. The method of claim 9,
Selecting the channel in the step of selecting the channel,
Selecting the channel at predetermined time intervals or when a request for identifying a reception radio wave environment occurs
Channel search method using spread spectrum in digital broadcasting system.

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