KR20120133488A - A method and apparatus for transmitting and receiving advanced terrestrial digital multimedia broadcasting system signal in a communication system - Google Patents

Abstract

PURPOSE: A method for transceiving a next generation ground-wave digital multimedia signal in a communication system and a device thereof are provided to transceive an AT-DMB(advanced terrestrial-Digital Media Broadcasting) signal while maintaining T-DMB(terrestrial-Digital Multimedia Broadcasting) performance. CONSTITUTION: A first signal generating unit generates an input signal as a first signal by using a first transmitting method. A second signal generating unit includes an STBC(space-time block coding) unit(402) and a pilot signal inserting unit(404). The second signal generating unit generates the input signal as a second signal by using a second transmitting method. Each of the first and the second signals includes an AT-DMB signal. A transmitting unit transmits the first and the second signals by using two transmitting antennas. The AT-DMB signal includes a pilot signal for distinguishing a channel which receives the second signal. [Reference numerals] (402) STBC unit; (404) Pilot signal inserting unit; (406) Delaying unit; (412a) Hierarchical modulation unit 1; (412b) Hierarchical modulation unit 2; (414a) RF modulation unit; (414b) RF modulation unit; (AA,CC) RSS inserting unit; (BB,DD) OFDM modulation unit

Description

A METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING ADVANCED TERRESTRIAL DIGITAL MULTIMEDIA BROADCASTING SYSTEM SIGNAL IN A COMMUNICATION SYSTEM}

The present invention relates to a method and apparatus for transmitting and receiving the next generation terrestrial digital multimedia signal in a communication system.

In the information society of the 21st century, broadcasting and communication services are entering the age of full-scale digitalization, multi-channelization, broadband, high quality, globalization and bidirectional. Also, as people spend more time outside their homes, the demand for watching TV broadcasts outside their homes increases significantly. In this situation, a lot of research is being conducted on the development of mobile multimedia broadcasting system for fixed, portable and mobile reception internationally. Terrestrial Digital Multimedia Broadcasting (T-DMB), one of the mobile multimedia broadcasting system standards currently developed for mobile multimedia broadcasting service, is used in harsh conditions such as an area surrounded by tall buildings or a vehicle moving at high speed. It is used to service video broadcasting normally. Recently, an advanced terrestrial DMB (AT-DMB: Advanced T-DMB) technology has been developed to increase data transmission speed and channel capacity than conventional T-DMB so as to realize three-dimensional DMB or to be viewed as a home TV receiver. .

In addition, since the mobile communication system continues to evolve in order to ensure a fast data rate, a terminal (hereinafter referred to as an existing terminal) and an evolved mobile communication system complying with the standards of the existing mobile communication system in a practical communication environment. Terminals (hereinafter referred to as "evolved terminals") according to the standard of the mixed.

Under such a communication environment, the AT-DMB may simultaneously support the evolved terminal while maintaining backward compatibility with the T-DMB. In this case, the AT-DMB transmits additional information to support the enhanced picture quality compared to the picture quality supported by the T-DMB. As a result, there is a problem that the service coverage of the T-DMB is reduced. In addition, there is a problem that a performance degradation occurs in the existing terminal receiving the T-DMB reduced service coverage.

The present invention provides a method and apparatus for transmitting and receiving signals of an AT-DMB while maintaining the performance of the T-DMB in a communication system.

The present invention provides a method and apparatus for generating a BL signal and an AL signal constituting the AT-DMB signal using the CDD method and the STBC method, respectively, and transmitting them through independent transmission channels.

The method proposed in the present invention; A method of transmitting a next-generation terrestrial digital multimedia broadcasting signal in a communication system, the method comprising: generating an input signal as a first signal included in the next-generation terrestrial digital multimedia broadcasting signal using a first transmission method, and a second transmission method. Generating the input signal as a second signal included in the next generation terrestrial digital multimedia broadcasting signal; and transmitting the first signal and the second signal using two transmitting antennas.

Another method proposed by the present invention is as follows. A method of receiving a next generation terrestrial digital multimedia broadcasting signal in a communication system, the method comprising: receiving a next generation terrestrial digital multimedia broadcasting signal, acquiring information on a first signal included in the next generation terrestrial digital multimedia broadcasting signal, Acquiring information about a pilot signal of a channel on which the second signal included in the next-generation terrestrial digital multimedia broadcasting signal is transmitted; and using the information on the first signal and the information on the pilot signal. Restoring the second signal from the digital multimedia broadcasting signal.

The device proposed in the present invention; An apparatus for transmitting a next-generation terrestrial digital multimedia broadcasting signal in a communication system, the apparatus comprising: a first signal generator configured to generate an input signal as a first signal included in the next-generation terrestrial digital multimedia broadcasting signal using a first transmission method; A second signal generator for generating the input signal as a second signal included in the next-generation terrestrial digital multimedia broadcasting signal using a two-transmission method, and transmitting the first signal and the second signal using two transmitting antennas; And a transmitting unit.

Another apparatus proposed in the present invention is a system comprising: An apparatus for receiving a next-generation terrestrial digital multimedia broadcasting signal in a communication system, the apparatus comprising: a receiving unit for receiving a next-generation terrestrial digital multimedia broadcasting signal, and obtaining information about a first signal included in the next-generation terrestrial digital multimedia broadcasting signal, Acquire information on a pilot signal of a channel on which a second signal included in the terrestrial digital multimedia broadcasting signal is transmitted, and use the information on the first signal and the information on the pilot signal to transmit the next generation terrestrial digital multimedia broadcasting signal. And a restoration unit for restoring the second signal from the second signal.

The present invention uses different transmission schemes (CDD and STBC) and independent channels for each of the BL signal and the AL signal constituting the AT-DMB signal, thereby reducing the disadvantage of reducing service coverage compared to the existing T-DMB signal. High-quality signals, which are advantages of AT-DMB, have an effect of increasing the service coverage that can be received.

1A is a schematic diagram of a communication system generally supporting AT-DMB and T-DMB at the same time.
1B is a diagram illustrating an environment in which an AT-DMB signal and a T-DMB signal are generally received in a communication system supporting AT-DMB and T-DMB at the same time.
2 is a graph comparing the performance of the T-DMB signal and the AT-DMB signal.
3 is a schematic configuration diagram of a transmitter using a general CDD scheme.
4A is an AT-DMB transmitter according to a first embodiment of the present invention.
4B is an AT-DMB transmitter according to a second embodiment of the present invention.
5 is an operation flowchart of an AT-DMB transmitter according to an embodiment of the present invention.
6A and 6B are schematic diagrams of an AT-DMB receiver according to an exemplary embodiment of the present invention.
7 is an operation flowchart of an AT-DMB receiver according to an embodiment of the present invention.
8 is a graph showing the effect according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that in the following description, only parts necessary for understanding the operation according to the present invention will be described, and descriptions of other parts will be omitted so as not to distract from the gist of the present invention.

The present invention proposes a method and apparatus for transmitting and receiving signals in a communication system supporting AT-DMB and T-DMB simultaneously.

1A is a schematic configuration diagram of a communication system that generally supports AT-DMB and T-DMB simultaneously.

Referring to FIG. 1A, the communication system includes an upper layer 100, a base station 110, a T-DMB receiver 115, and an AT-DMB receiver 120.

The upper layer 100 includes a scalable video coding (SVC) unit 102, a hierarchical modulator 104, and a radio frequency (RF) modulator 106. When the multimedia broadcasting signal, for example, a video signal, to be provided to the receivers is input, the SVC unit SVC transmits the video signal to the hierarchical modulator 104.

The layer modulator 104 modulates the input signal using a modulation scheme such as differential quadrature phase-shift keying (DQPSK) to generate an input signal as a basic layer (BL) signal which is a T-DMB signal. Modulating the input signal using a QPSK or Binary Phase Shift Keying (BPSK) scheme to generate the BL modulator 104a and an advanced layer (AL) signal included in the AT-DMB signal. AL modulator 104b. Thereafter, the signal output from each of the BL modulator 104a and the AL modulator 104b is transmitted to the RF modulator 106 and modulated into a signal suitable for an RF channel. The T-DMB receiver 115 and the AT-DMB receiver 120 are transmitted to each.

FIG. 1B is a diagram illustrating an environment in which an AT-DMB signal and a T-DMB signal are generally received in a communication system supporting AT-DMB and T-DMB simultaneously.

Referring to FIG. 1B, the base station 110 broadcasts a combination of a BL signal and an AL signal, which are AT-DMB signals, and a BL signal, which is a T-DMB signal. Then, the terminal 1 having a higher signal-to-noise ratio (SNR) than the terminal 2 receives a combination of the BL signal and the AL signal, and the terminal 2 having a lower SNR than the terminal 1 receives the BL signal.

1C is a diagram illustrating a general BL + AL signal and a BL signal.

Referring to FIG. 1C, the T-DMB signal transmits only the basic BL 130 signal, whereas the AT-DMB signal transmits an AL 135 signal, which is additional information for improving image quality, to the BL signal. .

2 is a graph comparing the performance of the T-DMB signal and the AT-DMB signal.

Referring to FIG. 2, it can be seen that the SNR of the AT-DMB signal has a higher value than the SNR of the T-DMB signal having the same bit error rate (BER) value. Here, as an example of the AT-DMB signal, a BL signal and an AL signal in the case of performing APSK (Amplitude Differential Phase Shift Keying) modulation and Q mode modulation are used. Here, HP represents a BL signal, and LP represents an AL signal.

As a result, the AT-DMB signal further includes an AL signal which is additional information as compared to the existing T-DMB signal, thereby reducing service coverage for transmitting the T-DMB signal.

Therefore, the present invention proposes a method and apparatus for transmitting / receiving a signal which can reduce service coverage reduction of a BL signal by applying different transmission schemes to a BL signal and an AL signal using a plurality of transmit antennas. In detail, in the case of an existing terminal capable of receiving only a BL signal, a cyclic delay diversity (CDD) scheme is used to use an existing reception method regardless of whether a plurality of transmit antennas exist. In addition, in the case of an evolved terminal capable of receiving not only the BL signal but also the AL signal, a space time block coding (STBC) scheme is used to decode the AL signal transmitted through a recognized transmission method.

In general, the AT-DMB signal transmitter transmits a BL signal and an AL signal through the same channel. However, an embodiment of the present invention proposes a method of transmitting each of the BL and AL signals through different channels in order to ensure reception performance of each of the BL and AL signals.

3 is a schematic configuration diagram of a transmitter using a general CDD scheme.

Referring to FIG. 3, the transmitter 300 includes a delay unit 302, RF modulators 304a and b, and two transmit antennas 1 and 2 304a and b. The input signal input to the transmitter 300 is transmitted through each of the two transmission antennas 1 and 2 304a and b through two paths. First, the input signal input through the first path is RF modulated through the RF modulator 304a and then output through the transmit antenna 1 304a. Next, the input signal input through the second path is delayed by a predetermined unit time time through the delay unit 302, and then RF-modulated through the RF modulator 304b and transmitted through the transmit antenna 2 304b. Is output.

In summary, the CDD scheme is a transmission scheme in which one input signal is output through two transmission antennas, that is, the input signal itself and a delayed input signal delayed by a predetermined unit time.

3B is an example of configuration diagram of a general AT-DMB transmitter.

Referring to FIG. 3B, the AT-DMB transmitter 310 includes components for generating an input signal into a BL signal and an AL signal included in the AT-DMB signal, respectively. Specifically, the AT-DMB transmitter 300 includes a convolutional encoder 312 for transmitting the BL signal, a transmission frame MUX 314, a QPSK modulator 316, a frequency interleaver 318, The DPSK modulator 320 is included. The AT-DMB transmitter 310 includes a turbo encoder 322 for transmitting the AL signal, a transmission frame MUX 324, a BPSK / QPSK modulator 326, and a frequency interleaver 328. . Detailed configurations included in the AT-DMB transmitter 310 as mentioned above operate in the same manner as those included in a general transmitter and are not techniques proposed by the present disclosure, and thus, detailed descriptions thereof are omitted herein. do.

The AT-DMB transmitter 310 inputs two signals generated by passing each of the detailed components provided to generate the BL signals and the AL signals listed above to the hierarchical modulator 330. The hierarchical modulator 330 combines the two signals through the summer 332 and inputs the summed signal to an orthogonal frequency-division multiplexing (OFDM) modulator 334. The OFDM modulator 334 performs OFDM modulation on the PRS and the sum signal input from the phase reference symbol (PRS) insertion unit 336 and outputs the AT-DMB signal after OFDM modulation. That is, the BL signal and the AL signal included in the AT-DMB signal output through the AT-DMB transmitter 310 are broadcasted through the same channel.

 Hereinafter, in the embodiment of the present invention, after generating different BL signals and AL signals by applying different transmission schemes to input signals to ensure the performance of each of the BL and AL signals included in the AT-DMB signal, Broadcast through the channel. Specifically, the BL signal is generated by applying the CDD scheme and broadcasted through a channel independent of the transmission channel of the AL signal. In addition, the AL signal is generated by applying the STBC method having higher performance than the CDD method, and is also broadcasted through a channel independent of the transmission channel of the BL signal.

To this end, an embodiment of the present invention provides a method for distinguishing a channel on which the AL signal is transmitted so that the terminal can distinguish the channel on which the AL signal generated by applying the STBC method from the transmission channel of the BL signal generated by the CDD method. A pilot signal is inserted into the AL signal. Specifically, in the first embodiment of the present invention, an AT-DMB transmitter and a transmission operation for performing a pilot procedure for inserting a pilot signal for distinguishing channels where the AL signal is transmitted and a delay procedure for applying a CDD scheme of a BL signal before OFDM modulation Suggest.

Next, in the second embodiment of the present invention, the AT-DMB transmitter and the transmitter perform a pilot signal insertion for the transmission channel of the AL signal during OFDM modulation and then perform a delay procedure for applying the CDD scheme of the BL signal. Suggest an action.

4A illustrates an AT-DMB transmitter according to a first embodiment of the present invention.

Referring to FIG. 4A, the AT-DMB transmitter 400 includes an STBC unit 402, a pilot signal insertion unit 404, a delay unit 406, a sum unit 1 408, a sum unit 2 410, and hierarchical modulation. Part 1 and 2 (412a and b), RF modulator 1 and 2 (414a and b) and transmit antennas 1 and 2 (416a and b) are included.

When an input signal is received by the AT-DMB transmitter 400, the input signal is input to the adder 1 408 and the delay unit 406 connected to the path 2 located in the path 1. The delay unit 406 delays the input signal by a predetermined unit time, and then inputs it to the adder 2 410 located in the path 2.

Simultaneously with the operation, the AT-DMB transmitter 400 inputs the input signal to the STBC unit 420. Then, the STBC unit 420 performs STBC on the input signal, generates two STBC signals, and inputs the two STBC signals to the pilot signal insertion unit 404. Then, the pilot signal inserting unit 404 inserts a pilot signal for distinguishing a channel through which the AL signal is transmitted into each of the two STBC signals, and then adds the sum unit 1 410 and the sum unit 2 408. Print each one.

Then, the adder 1 410 inputs the combined signal generated by summing the signal input through the pilot signal inserter 404 and the input signal entering the path 1 to the hierarchical modulator 1 412a. do. Then, the hierarchical modulator 1 412a performs OFDM modulation on the sum signal together with the PRS, and inputs the signal on which the OFDM modulation is performed to the RF modulator 1 414a. Then, the RF modulator 1 414a performs RF modulation on the signal on which the OFDM modulation is performed, and then inputs the RF modulated signal to the transmit antenna 1 414b.

The adder 2 408 adds the sum signal generated by adding the signal input through the pilot signal inserter 404 and the delay signal input from the delay unit 406 to the hierarchical modulator 2 412b. Enter it. The hierarchical modulator 2 (412b) performs OFDM modulation on the sum signal together with the PRS, and then inputs the signal on which the OFDM modulation is performed to the RF modulator 2 (414b). Then, the RF modulator 2 414b performs RF modulation on the signal on which the OFDM modulation has been performed, and then inputs the RF modulated signal to the transmit antenna 2 414b. Thereafter, the transmit antenna 1 414a and the transmit antenna 2 414b broadcast the input signals, respectively.

4B illustrates an AT-DMB transmitter according to a second embodiment of the present invention.

Referring to FIG. 4B, the AT-DMB transmitter 420 includes the hierarchical modulator 422, the STBC unit 424, the OFMD modulators 1,2 (426a, b), the sum unit 1 428, and the delay unit 430. ), A summation unit 2 (432), RF modulators 1, 2 (434a, b) and transmit antennas 1, 2 (436a, b).

When the input signal is received, the AT-DMB transmitter 420 inputs the input signal to the hierarchical modulator 1 412a. Then, the hierarchical modulator 1 412a performs OFDM modulation on the input signal together with the PRS, and then inputs the input signal to the adder 1 428 and the delay unit 430, respectively.

At the same time, the AT-DMB transmitter 420 inputs the input signal to the STBC unit 424. Then, the STBC unit 424 STBCs the input signal, generates two STBC output signals, and inputs each of the OFDM modulators 1, 2 (426a, b). At this time, the pilot signal for the transmission channel of the AL signal to the STBC output signal is also input to each of the OFDM modulator 426a, b is OFDM modulated together with the STBC output signal. The signal output from the OFDM modulator 1 426a is input to the adder 1 428, and the signal output from the OFDM modulator 2 426b is input to the adder 2 432.

The adder 1 428 is configured to add the signal input from the hierarchical modulator 422 and the signal input from the OFDM modulator 1 426a to the RF modulator 1 434a. Enter it. Then, the RF modulator 1 (434a) RF modulates the summed signal and inputs the transmitted antenna 1 (436a).

The adder 2 432 adds the delayed signal inputted through the delay unit 430 and the signal inputted from the OFDM modulator 2 426b to the RF modulator 2 434b. Enter it. Then, the RF modulator 2 (434b) RF-modulates the sum signal and inputs the transmitted antenna 2 (436b).

5 is an operation flowchart of an AT-DMB transmitter according to an embodiment of the present invention.

Referring to FIG. 5, in step 500, the AT-DMB transmitter receives an input signal and proceeds to steps 510a and b. In step 510a, the AT-DMB transmitter generates a BL signal using the CDD method with respect to the input signal, and then proceeds to step 515. In step 510b, the AT-DMB transmitter generates an AL signal using the STBC method with respect to the input signal, and then proceeds to step 515.

In step 515, the AT-DMB transmitter transmits signals output through steps 510a and b through two corresponding transmission antennas.

At this time, in the first embodiment of the present invention, the input signal itself and the delay signal generated by delaying the input signal to the delay unit for a predetermined unit time are added to each of the path 1 and the path 2 as a part of the BL signal. Is entered as At the same time, STBC is performed on the input signal to generate two STBC signals, and then a pilot signal for distinguishing a channel through which an AL signal is transmitted is inserted. Thereafter, each of the STBC signals into which the pilot signal is inserted is input to a summer located in each of the path 1 and the path 2. Subsequently, a summer located in each of the path 1 and the path 2 adds the input AL signal and the BL signal described above, and inputs the summed signal to the connected transmit antenna by OFDM and RF modulation.

Meanwhile, in the second embodiment of the present invention, after the OFDM signal is modulated with the input signal, the modulated OFDM signal itself and a delay signal for delaying the modulated ODM signal by a predetermined unit time are generated as BL signals, and then the path is generated. Enter the summers located in 1 and 2 respectively. Then, the BL signal for each path generated through the above process is generated as an AL signal of the corresponding path by generating the STBC signal generated using the STBC method, respectively, and is input to the summer located in each of the path 1 and the path 2. .

At the same time, STBC is performed on the input signal to generate two STBC signals, and then a pilot signal for distinguishing a channel through which an AL signal is transmitted is inserted. Thereafter, OFDM modulation is performed on the STBC signal into which the pilot signal is inserted, and each of the signals on which the OFDM modulation is performed is input to an adder located in each of the path 1 and the path 2 as an AL signal. Subsequently, a summer located in each of the path 1 and the path 2 adds the input AL signal and the aforementioned BL signal, and RF-modulates the summed signal to the connected transmission antenna.

Accordingly, the AT-DMB receiver according to the embodiment of the present invention decodes only the AL signal based on the information on the received BL signal to extract the AL signal transmitted with the BL signal to the general AT-DMB receiver. And a channel estimator for estimating the channel through which the AL signal is transmitted.

6A and 6B are schematic diagrams of an AT-DMB receiver according to an exemplary embodiment of the present invention.

6A and 6B, the AT-DMB receiver 600 includes an RF tuner 602, a frame synchronizer 606, a time synchronizer 608, an analog digital converter (ADC) 604, Down converter (610), Digitally Controlled Oscillator (DCO) 612, Automatic Gain Controller (AGC) 614, Fast Fourier transform (616), Frequency Synchronizer (618), Clock / Reset (clock / reset) control unit 620, equalizer 622, DQPSK demodulator 624, time deinterleaver 626, 634, STBC decoder 628, channel estimator 630 Low pass demodulator 632, Viterbi decoder 636, descramblers 638 and 646, turbo decoder 644, audio decoder 640, convolutional deinterleaver (Convolutional deinterleaver) & Reed-Solomon decoder (624a, b). Since the remaining configurations except for the STBC decoder 628 and the channel estimator 630 among the detailed configurations of the AT-DMB receiver 600 are the same as those of a general AT-DMB receiver, the detailed description thereof will be provided herein. Will be omitted.

The AT-DMB receiver 600 receives an AT-DMB signal obtained by adding a BL signal and an AL signal through a receiving antenna. In this case, the AT-DMB signal also includes a pilot signal for distinguishing a channel through which the AL signal is transmitted. Then, the AT-DMB signal is demodulated after passing through the components up to the equalizer 622 and input to the channel estimator 630 and the STBC decoder 628, respectively. The channel estimator 630 obtains a pilot signal from the demodulated signal input from the equalizer 622 to estimate a channel through which the AL signal is transmitted, and inputs information on the pilot signal to the STBC decoder 628. do.

The STBC decoder 628 receives information on the BL signal included in the AT-DMB signal from the DQPSK demodulator 624.

The AT-DMB signal according to an embodiment of the present invention includes a pilot signal for distinguishing a channel through which the AL signal is transmitted in a combination of a BL signal and an AL signal. Therefore, the STBC decoder 628 uses the information on the pilot signal input from the equalizer 622 and the information on the BL signal obtained from the DQPSK demodulator 624 to determine the BL signal from the AT-DMB signal. The pilot signal is removed, the AL signal is obtained, and then transmitted to the LP demodulator 632.

7 is a flowchart illustrating operations of an AT-DMB receiver according to an exemplary embodiment of the present invention.

Referring to FIG. 7, in step 700, the AT-DMB receiver receives an AT-DMB signal and proceeds to step 705. In step 705, the AT-DMB receiver acquires information on the BL signal. In step 710, the AT-DMB receiver acquires information on a pilot signal for identifying a channel on which an AL signal is transmitted from the channel estimator, and then proceeds to step 715. . In step 715, the AT-DMB receiver restores the AL signal by removing the BL signal and the pilot signal from the AT-DMB signal using the information on the BL signal and the information on the pilot signal.

8 is a graph showing the effect according to an embodiment of the present invention.

Referring to FIG. 8, when the general AT-DMB signal, that is, the AL signal and the BL signal have the same BER value as the T-DMB signal, has a high SNR value. On the other hand, according to an embodiment of the present invention, it can be seen that the SNR value of the AT-DMB signal, that is, the AL signal and the BL signal, is significantly lower than the general AT-DMB signal.

That is, according to an embodiment of the present invention, the BL signal is transmitted using the CDD method, the AL signal is transmitted using the STBC method, and transmitted through different channels, thereby reducing service coverage compared to the existing T-DMB signal. This reduces the disadvantages, and the service coverage that can receive a high quality signal, which is an advantage of AT-DMB, is increased.

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 to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

Claims (28)

In the method for transmitting a next-generation terrestrial digital multimedia broadcasting signal in a communication system,
Generating an input signal as a first signal included in the next generation terrestrial digital multimedia broadcasting signal using a first transmission method;
Generating a second signal included in the next generation terrestrial digital multimedia broadcasting signal using a second transmission method;
And transmitting the first signal and the second signal using two transmitting antennas.
The method of claim 1,
The next generation terrestrial digital multimedia broadcasting signal transmission method includes a pilot signal for distinguishing a channel through which the second signal is transmitted.
The method of claim 1,
The first transmission scheme represents a Cyclic Delay Diversity (CDD) scheme for transmitting the input signal and a delay signal generated by delaying the input signal by a predetermined unit time using different antennas.
The second transmission scheme represents an STBC scheme in which two STBC signals generated by performing space time block coding (STBC) on the input signal are transmitted using the different antennas, respectively. Digital multimedia broadcasting signal transmission method.
The method of claim 1,
The process of generating the first signal,
And generating a delay signal delaying the input signal by a predetermined unit time.
5. The method of claim 4,
The process of generating the second signal,
Generating two STBC signals by performing space time block coding (STBC) on the input signal;
And inserting a pilot signal for distinguishing a transmission channel through which the second signal is transmitted into the two STBC signals.
The method of claim 5,
The process of transmitting the first signal and the second signal using two transmitting antennas,
Generating a first summation signal by summing the input signal and a first STBC signal which is one of the two STBC signals;
Generating a first modulated signal by performing orthogonal frequency-division multiplexing (OFDM) modulation and radio frequency (RF) modulation on the first summed signal;
And transmitting the first modulated signal through a first transmit antenna which is one of the two transmit antennas.
The method according to claim 6,
Generating a second summed signal by summing the delay signal and a second STBC signal which is one of the two STBC signals;
Next-generation terrestrial waves, comprising: generating a second modulated signal by OFDM modulating and RF modulating the second summed signal; and transmitting the second modulated signal through a second transmit antenna, which is one of the two transmit antennas. Digital multimedia broadcasting signal transmission method.
The method of claim 1,
Generating the first signal,
Generating an OFDM signal by performing orthogonal frequency division multiplexing (OFDM) on the input signal;
And generating an OFDM delay signal delaying the OFDM signal by a predetermined unit time.
9. The method of claim 8,
The process of generating the second signal,
Transmitting two STBC signals by performing Space Time Block Coding (STBC) on the input signal;
Inserting a pilot signal for a transmission channel of the second signal into the two STBC signals, OFDM modulating each of the two STBC signals into which the pilot signal is inserted, and a first OFDM modulated signal into which the pilot is inserted, and the pilot And a method for generating the inserted second OFDM signal.
10. The method of claim 9,
The process of transmitting the first signal and the second signal using two transmitting antennas,
Generating a first summed signal by summing the OFDM signal and the first OFDM modulated signal inserted with the pilot;
Generating a first modulated signal by performing radio frequency (RF) modulation on the first sum signal;
And transmitting the first modulated signal through a first transmit antenna which is one of the two transmit antennas.
The method of claim 10,
The process of transmitting the first signal and the second signal using two transmitting antennas,
Generating a second summed signal by summing the OFDM delay signal and the second OFDM modulated signal inserted with the pilot;
Generating a second modulated signal by radio frequency (RF) modulating the second sum signal;
And transmitting the second modulated signal through a second transmit antenna which is one of the two transmit antennas.
In the method for receiving a next-generation terrestrial digital multimedia broadcasting signal in a communication system,
Receiving the next generation terrestrial digital multimedia broadcasting signal;
Acquiring information about a first signal included in the next generation terrestrial digital multimedia broadcasting signal;
Obtaining information about a pilot signal of a channel on which a second signal included in the next generation terrestrial digital multimedia broadcasting signal is transmitted;
And recovering the second signal from the next-generation terrestrial digital multimedia broadcasting signal using the information on the first signal and the information on the pilot signal.
The method of claim 12,
The next generation terrestrial digital multimedia broadcasting signal,
And a first signal and a second signal generated by using a first transmission method and a second transmission method, respectively.
The method of claim 12,
The first transmission scheme represents a cyclic delay diversity (CDD) scheme for transmitting the input signal and a delay signal generated by delaying the input signal by a predetermined unit time using different antennas.
The second transmission scheme represents an STBC scheme in which two STBC signals generated by performing space time block coding (STBC) on the input signal are respectively transmitted using the different antennas. Terrestrial digital multimedia broadcasting signal reception method.
An apparatus for transmitting a next generation terrestrial digital multimedia broadcasting signal in a communication system,
A first signal generator for generating an input signal as a first signal included in the next generation terrestrial digital multimedia broadcasting signal using a first transmission method;
A second signal generator for generating the input signal as a second signal included in the next generation terrestrial digital multimedia broadcasting signal using a second transmission method;
And a transmission unit for transmitting the first signal and the second signal using two transmission antennas.
16. The method of claim 15,
The next generation terrestrial digital multimedia broadcasting signal transmission device includes a pilot signal for distinguishing a channel through which the second signal is transmitted.
16. The method of claim 15,
The first transmission scheme represents a Cyclic Delay Diversity (CDD) scheme for transmitting the input signal and a delay signal generated by delaying the input signal by a predetermined unit time using different antennas.
The second transmission scheme represents an STBC scheme in which two STBC signals generated by performing space time block coding (STBC) on the input signal are transmitted using the different antennas, respectively. Digital multimedia broadcasting signal transmission device.
The method of claim 15,
The first signal generator,
And a next generation terrestrial digital multimedia broadcasting signal transmitting apparatus generating a delayed signal delaying the input signal by a predetermined unit time.
19. The method of claim 18,
The second signal generator,
An STBC unit generating space signal block coding (STBC) into two STBC signals by performing space time block coding (STBC), and a pilot signal for distinguishing a transmission channel through which the second signal is transmitted to the two STBC signals Next-generation terrestrial digital multimedia broadcasting signal transmitting apparatus comprising a pilot signal inserting unit for inserting a.
20. The method of claim 19,
The transmitting unit,
A resuming unit configured to add the input signal and a first STBC signal, which is one of the two STBC signals, to generate a first summation signal;
An OFDM modulator for generating a first OFDM signal by performing orthogonal frequency-division multiplexing (OFDM) modulation on the first summed signal;
An RF modulator for generating a first modulated signal by modulating the first OFDM modulated signal by radio frequency (RF);
And a first transmission antenna which is one of the two transmission antennas for transmitting the first modulated signal.
21. The method of claim 20,
The transmitting unit,
A second adder which adds the delay signal and a second STBC signal which is one of the two STBC signals to generate a second sum signal;
An OFDM modulator for OFDM modulating the second sum signal to generate a second OFDM signal;
An RF modulator for RF modulating the second OFDM signal to generate a second modulated signal;
And a second transmission antenna which is one of the two transmission antennas for transmitting the second modulated signal.
16. The method of claim 15,
The first signal generator,
An OFDM modulator for generating orthogonal frequency-division multiplexing (OFDM) to generate a first OFDM signal;
And a delay unit for generating an OFDM delay signal delaying the OFDM signal by a predetermined unit time.
The method of claim 22,
The second signal generator,
An STBC unit generating two STBC signals by performing space time block coding (STBC) on the input signal;
A pilot signal insertion unit inserting pilot signals for the transmission channel of the second signal into the two STBC signals;
Next-generation terrestrial digital multimedia broadcasting signal including an OFDM modulator for OFDM-modulating each of the two STBC signals inserted with the pilot signal to generate the pilot-inserted first OFDM modulated signal and the pilot-inserted second OFDM modulated signal. Transmitting device.
24. The method of claim 23,
The transmitting unit,
A first adder which adds the OFDM signal and the first OFDM-modulated signal into which the pilot is inserted to generate a first summed signal;
A first RF modulator for generating a first modulated signal by modulating the first aggregated signal by radio frequency (RF);
And a first transmission antenna which is one of the two transmission antennas for transmitting the first modulated signal.
25. The method of claim 24,
The transmitting unit,
A second adder which adds the OFDM delay signal and the second OFDM-modulated signal into which the pilot is inserted and generates a second summed signal;
An RF modulator for generating a second modulated signal by performing radio frequency (RF) modulation on the second sum signal;
And a second transmission antenna which is one of the two transmission antennas for transmitting the second modulated signal.
An apparatus for receiving a next generation terrestrial digital multimedia broadcasting signal in a communication system,
A receiver for receiving a next generation terrestrial digital multimedia broadcasting signal;
Acquires information on a first signal included in the next generation terrestrial digital multimedia broadcasting signal, obtains information on a pilot signal of a channel on which a second signal included in the next generation terrestrial digital multimedia broadcasting signal is transmitted, and receives the first signal And a reconstruction unit for restoring the second signal from the next generation terrestrial digital multimedia broadcasting signal using information on the signal and the information on the pilot signal.
The method of claim 26,
The next generation terrestrial digital multimedia broadcasting signal,
A next generation terrestrial digital multimedia broadcasting signal receiving device comprising the first signal and the second signal generated by using a first transmission method and a second transmission method, respectively.
The method of claim 26,
The first transmission scheme represents a cyclic delay diversity (CDD) scheme for transmitting the input signal and a delay signal generated by delaying the input signal by a predetermined unit time using different antennas.
The second transmission scheme represents an STBC scheme in which two STBC signals generated by performing space time block coding (STBC) on the input signal are respectively transmitted using the different antennas. Terrestrial digital multimedia broadcasting signal receiving device.

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