KR101537557B1 - Transmitter of DRM broadcasting system - Google Patents

Abstract

The present invention relates to a transmitting apparatus for a DRM broadcasting system capable of increasing bandwidth for data transmission and providing various additional services and advanced audio services, A data division unit for outputting data on one channel according to the judgment, or dividing the data into two channels and outputting data; A first MSC for multiplexing audio data and binary data input from the data division unit to generate a first MSC signal and generating a first subcarrier; A second MSC for multiplexing audio data and binary data input from the data division unit to generate a second MSC signal and generating a second subcarrier; And a DRM signal generator for multiplexing the first and second MSC signals, the first and second subcarriers, performing OFDM modulation, and outputting a DRM signal.

Description

Technical Field [0001] The present invention relates to a transmitter of a DRM broadcasting system,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a transmission apparatus of a DRM broadcasting system, and more particularly, to a transmission apparatus of a DRM broadcasting system capable of increasing bandwidth for data transmission and providing various additional services and advanced audio services.

Generally, digital radio broadcasting has advantages in that it can provide various data services such as text messages, slide shows, traffic information, and journals in addition to high-quality stereo audio services, as compared with voice-oriented analog radio broadcasts.

In addition, digital radio broadcasts can significantly reduce transmission power when providing the same range of services, and are preparing for digital conversion of analog radio broadcasts in many countries.

The DRM (Digital Radio Mondiale) Plus system based on Orthogonal Frequency Division Multiplexing (OFDM) is a digital radio standard for Band I to II band (47 MHz to 174 MHz) and supports data rates up to 185 kbps at a bandwidth of 100 kHz. Thus, many countries are considering DRM Plus as a digital radio broadcast to replace analogue FM broadcasts.

The DRM Plus system provides data services as well as audio services. Examples of the additional data provided through the data service include still images, moving pictures, graphics, and the like. Examples of multimedia services that can be provided by transmitting such additional data include travel and traffic information providing services, (Program Associated Data) service such as displaying weather forecasts and traffic information in combination with electronic maps, independent information independent of programs such as Web site broadcasting and GPS for DAB Services, and video transmission services.

The DRM Plus system can provide various data services such as text and slide show while providing stereo audio quality of FM radio grade. It also has many advantages such as long distance transmission and low power consumption of the transmitter have.

However, the existing DRM Plus system has a bandwidth of 100 kHz, and there is a problem that a new frequency should be allocated when converting analog FM of FM band to digital.

In addition, the conventional DRM PLUS system has a throughput of up to 185 kbps, which is lower than that of a relatively different digital radio broadcasting system, for example, a DAB (Digital Audio Broadcasting) system or an HD radio system.

Therefore, it is limited in providing various services and advanced audio services due to limited throughput.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a transmitting apparatus for a DRM broadcasting system capable of providing a variety of additional services and advanced audio services by increasing bandwidth for data transmission .

According to an aspect of the present invention, there is provided a transmitting apparatus for a DRM broadcasting system, the apparatus comprising: a data output unit for outputting data in one channel according to a determination of whether a bandwidth of input data is equal to or greater than a preset bandwidth; And outputting the data; A first MSC for multiplexing audio data and binary data input from the data division unit to generate a first MSC signal and generating a first subcarrier; A second MSC for multiplexing audio data and binary data input from the data division unit to generate a second MSC signal and generating a second subcarrier; And a DRM signal generator for multiplexing the first and second MSC signals, the first and second subcarriers, performing OFDM modulation, and outputting a DRM signal.

In this case, if the bandwidth of the input data is smaller than the set bandwidth, the data division unit outputs all data to the first MSC unit. If the bandwidth of the input data is equal to or greater than the preset bandwidth, And outputting the data to the first MSC unit, and outputting the data having the set bandwidth or more to the second MSC unit.

The set bandwidth is 100 KHz, and the bandwidth of data input to the second MSC unit is 150 KHz or less.

The first subcarrier may be allocated in a range of -106 to 106, and the second subcarrier may be allocated in a range of -168 to -107 and 107 to 168. [

Meanwhile, a transmitting apparatus of a DRM broadcasting system of the present invention includes a FAC unit for pre-coding FAC information, for spreading and encoding the FAC information, and for outputting FAC signals; And an SDC unit for precoding the SDC information and for outputting an SDC signal by energy spreading and encoding, wherein the DRM signal generator outputs the FAC signal and the SDC signal to the first and second MSC signals, Multiplex with the second subcarrier, OFDM-modulate, and output the DRM signal.

In this case, each of the first and second MSC units encodes the audio data, precodes the binary data, multiplexes the encoded audio data and precoded binary data, and multiplexes and multiplexes the multiplexed data. Encoded, and cell interleaved to generate the first and second MSC signals.

The DRM signal generator may include a transmission frame multiplexer for multiplexing the first and second MSC signals, the first and second subcarriers, and outputting a transmission frame; And a broadcast signal generator for receiving the transmission frame, performing OFDM modulation, and outputting the DRM signal.

According to the present invention, two MSCs are provided to divide and transmit data corresponding to a certain bandwidth or more, thereby increasing the bandwidth of data that can be transmitted in comparison with the conventional method.

Thus, various additional services and advanced audio services can be provided through the extended data bandwidth.

1 is a block diagram illustrating a transmitting apparatus of a DRM broadcasting system according to an embodiment of the present invention.
2 is a table showing OFDM parameters in a transmitting apparatus of a conventional DRM broadcasting system.
3 is a table showing OFDM parameters in a transmitting apparatus of a DRM broadcasting system 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 so that those skilled in the art can easily carry out the present invention. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. Further, terms to be described below are terms defined in consideration of functions in the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification. Meanwhile, it should be understood that the DRM broadcasting system named in the description of the present invention represents a DRM plus system.

1 is a block diagram illustrating a transmitting apparatus of a DRM broadcasting system according to an embodiment of the present invention.

Referring to FIG. 1, a DRM broadcasting system according to an embodiment of the present invention includes a first MSC 100, a second MSC 200, a data divider 300, a Fast Access Channel (FAC) ) Unit 400, an SDC (Service Description Channel) unit 500, and a DRM signal generation unit 600.

The first MSC unit 100 multiplexes input audio data and binary data to generate a first MSC signal MSC1 and the second MSC unit 100 multiplexes input audio data and binary data, To generate a second MSC signal MSC2.

When the bandwidth of the input data is less than 100 kHz, the data divider 300 provides all the input data to the first MSC unit 100. When the bandwidth of the input data is greater than 100 kHz, Data to the first MSC unit 100 and data of the remaining bandwidth to the second MSC unit 200.

Therefore, when the bandwidth of input data is 100 kHz or more, the data division unit 300 provides the data having a bandwidth of 100 kHz or more to the second MSC unit 200.

In this case, subcarriers of -106 to 106 are allocated to the first MSC unit 100, and subcarriers of -168 to -107 and 107 to 168 are allocated to the second MSC unit 200.

The first MSC unit 100 includes a source coder 110, a pre-coder 120, a multiplexer 130, an energy spreader 140, a channel encoder 150, a cell interleaver 140, ) 160 and an oscillator 170. The oscillator 170 may be an oscillator.

Accordingly, the audio data input to the first MSC unit 100 is encoded by the source encoder 110, and the binary data input to the first MSC unit 100 is pre-coded (Pre-Coded).

The encoded audio data and the precoded binary data are multiplexed by the multiplexer 130, energy is diffused through the energy spreader 140, encoded through the channel encoder 150, and transmitted by the cell interleaver 160 Cell interleaved and finally outputted as a first MSC signal MSC1, and the oscillator 170 generates and outputs a first subcarrier SC1 for the first MSC signal MSC1. In this case, the first subcarrier SC1 may be -106 to 106.

Similarly, the second MSC unit 200 includes a source encoder 210, a precoder 220, a multiplexer 230, an energy spreader 240, a channel encoder 250, a cell interleaver 260 and an oscillator 270).

Accordingly, the audio data input to the second MSC unit 200 is encoded by the source encoder 210, and the binary data input to the second MSC unit 200 is pre- (Pre-Coded).

The encoded audio data and precoded binary data are multiplexed by the multiplexer 230, energy is diffused through the energy spreader 240, encoded through the channel encoder 250, and transmitted by the cell interleaver 260 Cell interleaved and finally outputted as a second MSC signal MSC2, and the oscillator 270 generates and outputs a second subcarrier SC2 for the second MSC signal MSC2. At this time, the second subcarrier SC2 may be -168 to -107 and 107 to 168. [

The FAC unit 400 transmits information ("FAC information") such as channel bandwidth for fast scanning of the receiver. The SDC unit 500 receives information ('SDC information') such as decoding and multiplexing configuration information of the MSC, ).

At this time, the FAC unit 400 includes a precoder 410, an energy spreader 420, and a channel encoder 430.

Accordingly, the FAC information is precoded by the precoder 410, is energy-diffused by the energy spreader 420, then encoded by the channel encoder 430, and finally output as the FAC signal FAC.

Similarly, the SDC unit 500 includes a precoder 510, an energy spreader 520, and a channel encoder 530.

Therefore, the SDC information is precoded by the precoder 510, is energy-diffused by the energy spreader 420, then encoded by the channel encoder 530, and finally output as the SDC signal SDC.

The DRM signal generator 600 multiplexes the first and second MSC signals and the first and second subcarriers, OFDM-modulates the multiplexed signals, and outputs a DRM signal.

At this time, in outputting the DRM signal, the DRM signal generator 600 adds the FAC signal (FAC) and the SDC signal (SDC), multiplexes the OFDM signal, and outputs the DRM signal.

The DRM signal generator 600 includes a transmission frame multiplexer 610 and a broadcast signal generator 620.

The transmission frame multiplexing unit 610 multiplexes the first MSC signal MSC1 and the first subcarrier SC1 output from the first MSC unit 100 and the second MSC signal MSC2 output from the second MSC unit 200, Multiplexes the MSC signal MSC2 and the second subcarrier SC2, and outputs a transmission frame.

At this time, the transmission frame multiplexer 610 outputs the transmission frame by adding the FAC signal (FAC) and the SDC signal (SDC) in outputting the transmission frame.

The broadcast signal generator 620 receives a transmission frame, modulates the OFDM signal, and outputs a DRM signal.

FIG. 2 is a table showing FODM parameters in a transmitting apparatus of a conventional DRM broadcasting system, and FIG. 3 is a table showing OFDM parameters in a transmitting apparatus of a DRM broadcasting system according to an embodiment of the present invention.

2 and 3, the bandwidth of the transmitting apparatus of the conventional DRM broadcasting system is 100 kHz and the number of subcarriers (Nsc) is in the range of -106 to 106. However, in the embodiment of the present invention The bandwidth of the transmission apparatus of the DRM broadcasting system according to the present invention is 150 kHz and the number of subcarriers Nsc is 337 having a range of -168 to 168. Therefore, It can be confirmed that both the bandwidth and the number of subcarriers Nsc are increased in the transmitting apparatus.

According to the present invention, two MSCs are provided to divide and transmit data corresponding to a certain bandwidth or more, thereby increasing the bandwidth of data that can be transmitted in comparison with the conventional method.

Thus, various additional services and advanced audio services can be provided through the extended data bandwidth.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. Various modifications, alterations, and changes may be made without departing from the scope of the present invention.

Therefore, the embodiments described in the present invention and the accompanying drawings are intended to illustrate rather than limit the technical spirit of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments and accompanying drawings . The scope of protection of the present invention should be construed according to the claims, and all technical ideas within the scope of equivalents should be interpreted as being included in the scope of the present invention.

100: first MSC 200: second MSC
110, 210: Source coder 120, 220, 410, 510:
130, and 230, a multiplexer 140, 240, 420, and 520,
150, 250, 430, 530: Channel encoder 160, 260: Cell interleaver
170, 270: Oscillator 300: Data division unit
400: FAC unit 500: SDC unit
600: DRM signal generator 610: Transmission frame multiplexer
620: Broadcast signal generator

Claims (9)

A data division unit for outputting data in one channel or dividing the data into two channels according to a determination as to whether a bandwidth of input data is equal to or greater than a set bandwidth, and outputting data;
A first MSC for multiplexing audio data and binary data input from the data division unit to generate a first MSC signal and generating a first subcarrier;
A second MSC for multiplexing audio data and binary data input from the data division unit to generate a second MSC signal and generating a second subcarrier; And
And a DRM signal generator for multiplexing the first and second MSC signals, the first and second subcarriers, performing OFDM modulation, and outputting a DRM signal,
Wherein the data division unit outputs all data to the first MSC unit when the bandwidth of the input data is smaller than the set bandwidth, and if the bandwidth of the input data is equal to or greater than the set bandwidth, And outputs data of a bandwidth exceeding a predetermined bandwidth to the second MSC unit.
delete The method according to claim 1,
Wherein the first subcarrier is allocated in a range of -106 to 106, and the second subcarrier is allocated in a range of -168 to 168.
The method according to claim 1,
A FAC unit for pre-coding FAC information, for spreading and encoding the FAC information, and for outputting an FAC signal; And
An SDC unit for precoding SDC information, spreading and encoding energy, and outputting an SDC signal;
Further comprising: a receiving unit that receives the DRM signal from the DRM server;
5. The method of claim 4,
Wherein the DRM signal generator multiplexes the FAC signal and the SDC signal together with the first and second MSC signals, the first and second subcarriers, OFDM-modulates the DRC signal, and outputs the DRM signal. Transmitting apparatus.
The method according to claim 1,
Each of the first and second MSC units encodes the audio data, precodes the binary data, multiplexes the encoded audio data and precoded binary data, and performs energy spreading and encoding of the multiplexed data And cell interleaving to generate the first and second MSC signals.
The method according to claim 1,
The DRM signal generator includes a transmission frame multiplexer for multiplexing the first and second MSC signals, the first and second subcarriers, and outputting a transmission frame; And
And a broadcast signal generator for receiving the transmission frame, performing OFDM modulation on the transmission frame, and outputting the DRM signal.
The method according to claim 1,
Wherein the set bandwidth is 100 KHz.
The method according to claim 1,
And a bandwidth of data input to the second MSC unit is 150 KHz or less.

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