Design and Implementation of DVB-T Receiver System for Digital TV

J. S. Choi et al.: Design and Implementation of DVB-T Receiver System for Digital TV 991 Design and Implementation of DVB-T Receiver System for Digi...
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J. S. Choi et al.: Design and Implementation of DVB-T Receiver System for Digital TV

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Design and Implementation of DVB-T Receiver System for Digital TV Jae Seung Choi, Member, IEEE, Joo Won Kim, Dong Seog Han , Jae Yeal Nam, Member, IEEE, Yeong Ho Ha, Senior Member, IEEE Abstract — This paper presents a DVB-T receiver system based on the OFDM modulation method, which has exhibited a good reception performance even with obstacles and a mobile reception. As such, an improved OFDM receiver is developed for a DVB-T system that also considers function expansion for further development. Experiments confirmed the performance of the proposed DVB-T receiver, plus a GUI and EPG are developed for the DTV user 1. Index Terms — DVB-T receiver system, OFDM, Digital TV, GUI, EPG.

I. INTRODUCTION Multipath conditions, resulting from intersymbol interferences between reflected signals due to mountains, buildings etc, are one of the main constraints in terrestrial broadcasting. Plus, diffraction and reflection are common in the VHF (Very High Frequency) and UHF (Ultra High Frequency) frequencies used for terrestrial broadcasting. Digital video broadcasting for terrestrial (DVB-T) [1] [2] is a European digital TV transmission specification that uses an orthogonal frequency division multiplexing (OFDM) technique [3], which is a kind of multi-carrier modulation technique that has proved useful under multipath conditions. This technique has also received attention in relation to digital multimedia broadcasting (DMB) services [4]. Several DVB-T systems for digital terrestrial TV have been proposed in recent years, such as the front-end module [5] [6], demodulator module [7], decoder module [8], and so on. However, the performance of these systems has only been evaluated as regards the hardware receiver system. Accordingly, this paper presents a built-in board system with improved OFDM, plus high function software, including a graphic user interface (GUI) and electronic program guide (EPG), thereby

1 Jae Seung Choi is with Digital Technology Research Center of Kyungpook National University, 240 College of Engineering BD. V, 1370 Sankyuk-dong, Buk-gu, Daegu 702-701, Korea (e-mail: [email protected]). Joo Won Kim is with LG Electronics, Inc. 642, Jinpyung-dong, Kumi-City, Kyoungsang Buk-do, 730-360, Korea (e-mail: [email protected]). Dong Seog Han is with the Department of Electronic Engineering of Kyungpook National University, 1370 Sankyuk-dong, Buk-gu, Daegu 702701, Korea (e-mail: [email protected]). Jae Yeal Nam is with the Department of Computer Engineering of Keimyung University, 1000 Shindang-dong, Dalseo-gu, Daegu 704-701, Korea (e-mail: [email protected]). Yeong Ho Ha is with the Department of Electronic Engineering of Kyungpook National University, 1370 Sankyuk-dong, Buk-gu, Daegu 702701, Korea (e-mail: [email protected]). This work was supported in part by the LG electronics Inc.

Contributed Paper Manuscript received July 9, 2004

providing an improved DVB-T receiver system that can be applied to a digital TV (DTV) system. In order to improve the reception performance, a front-end module is developed using a tuner and demodulator, and the final output resolution of the proposed system is supported up to a high definition (HD). If we apply the proposed system to a DTV system, we are able to reduce the cost of the products, and to allow for easy expansion. After manufacturing the DVB-T receiver system, the hardware performance is evaluated. Meanwhile, software, including a basic setting menu for a GUI and EPG, is developed for easy handling by the user. Section II of this paper describes the general structure of the OFDM system, while Section III introduces the proposed DVBT receiver system. Section IV presents the development results, and some final conclusions are given in Section V. II. STRUCTURE OF OFDM SYSTEM In contrast to a single carrier system, which only transmits with one carrier frequency, OFDM transmits data with N sub-carriers that are equally spaced across the whole bandwidth. Each signal constellation with a quadrature amplitude modulation (QAM) format is modulated with a subcarrier, and each constellation is called a sample. As a result, a sample signal is transmitted over N sample periods, called symbol periods, instead of the narrow bandwidth of a subcarrier. In addition to the long symbol period, a guard interval is also inserted at the beginning of the symbol by some of the last part of the transmitting symbol, referred to as a cyclic prefix, which enhances the system performance under multipath conditions. Although the narrow data bandwidth means that some data can be distorted by multipath narrowband fading, interleaving and error-correcting code techniques can be used to improve the performance. However, since an OFDM modulated waveform is very close to random noise, the waveform can be considered as random noise to other cochannel signals [9]. The transmitter architecture for DVB-T is shown in Fig. 1 [10]. One of the distinguishing features of DVB-T is that it supports hierarchical transmission according to channel conditions. For relatively good signal reception areas, a high data rate mode of DVB-T signals is transmitted, otherwise a low data rate mode is used. As such, there are two different encoding paths according to the data rate. Even among the normal modes, which do not support the hierarchical mode, there are also many options for controlling the data rate. In relation to the number of subcarriers, there are 2K and 8K transmission modes that have 1,704 and 6,816 sub-carriers, respectively. There are also 1/4, 1/8, 1/16, and 1/32 guard interval modes according to the delay of the maximum multipath.

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MPEG-2 Source coding &Multiplexing ProgramMUX Video Coder

Transport MUX 1

Audio Coder Data Coder

2 n

Splitter

MUX Adaptation Energy Dispersal

Outer Coder

Outer Interleaver

Inner Coder

MUX Adaptation Energy Dispersal

Outer Coder

Outer Interleaver

Inner Coder

Inner Interleaver

Mapper

Frame Adaptation

OF DM

Pilot & TPS Signals

Guard Interval Insertion

D/ A

To Aerial Front End

Terrestrial Channel Adapter

Fig. 1. Structure of DVB-T transmitter III. PROPOSED DVB-T RECEIVER SYSTEM A. Construction of hardware A block diagram of the proposed DVB-T receiver system is shown in Fig. 2. MEMORY I2C External Port RESET

I2C

TS

RF

Frontend

TS

CI Processor I/F

Terrestrial RF Signal Input

Front- end supply

SUPPLY External power input

FLASH I/ F EMI I/F SMI I/ F

PROCESSOR & DECODER

Inner power

VIDEO

R/ L

AV Filter Filter

CVBS YUV

Serial communication I/F

Module I/ F RESET

AUDIO

RS232 I2C JTAG FRONT I/ F DEBUG I/ F PANNEL I/F

MISC

RS232

JTAG FRONT I2C DEBUG PANNEL

1) Processor & decoder module The processor & decoder module consists of a microprocessor, MPEG II audio/video decoder, PAL/NTSC/SECAM digital encoder, DEMUX DVB/DES descrambler, I2C for controlling each system IC, DCU using a JTAG port for debugging, RS232 interface, and memory interface. This module decodes an MPEG II TS to an A/V signal, and supports various A/V outputs. Furthermore, the module includes a microprocessor and hardware system on chip (SoC)-type MPEG II decoder in the inner part of the chip, where the CPU is a microprocessor with a 32bit VL-RISC chip and maximum internal operation frequency of 81 MHz. The proposed DVB-T receiver system outputs a right/left signal as the audio signal and CVBS/YUV signal as the video signal. Plus, the final output resolution of the system is supported up to a high definition (HD). For the interchange of data between the DTV analog board and the digital board of the DVB-T receiver system, the proposed system uses serial communication (SC) that transmits the key-values from the remote controller received by the microcomputer of the DTV analog board to the digital board of the DVB-T receiver system. 2) Front-end module In order to improve the reception performance, a front-end module was developed using a tuner and demodulator. The tuner module can receive a terrestrial DTV signal from 470 MHz to 860 MHz, and generates a differential signal with a center frequency of 4.57 MHz and bandwidth of 7.6 MHz. The demodulator generates an MPEG II TS from the differential signal received by the tuner, and outputs an MPEG II TS stream to the processor & decoder module through the CI module. A block diagram of the proposed front-end module is shown in Fig. 3.

Serial communication for DTV

TUNER_I2C

Fig. 2. Block diagram of proposed DVB-T receiver system The proposed DVB-T system amplifies the radio frequency (RF) signal received by the TV antenna, and reduces the noise. Thereafter, the system decodes it to an audio/video (A/V) signal and transmits it to an analog TV board. Essentially, the system consists of a front-end module, common interface (CI) module, processor & decoder module, and AV filter module, where the CI module is the common interface for a conditional access system (CAS), the processor & decoder module decodes an MPEG II transport stream (TS) [11]-[13] to an A/V signal, and the AV filter module filters the decoded A/V signal and converts the digital signal to an analog signal. In addition, the proposed system also includes a supply module that supplies power to the system, a memory module for saving the system data and programs, an RS232 module as the external interface, and a MISCellaneous (MISC) module as a diagnostic controller unit (DCU) port for debugging the system.

AGC

Tuner

Automatic Gain Control 2nd I/F Center frequency 4.57MHz with a bandwidth 7.6MHz

PULLUP, RC Filter & Voltage Follower

AGC XTAL POSITIVE

SingleDifferential Buffer

I2C

FE_CN2

Demodul ator

Buff er

TS

MPEG II Transport Stream

NEGATIVE

Seperate power LC Filter

Power, I2C, RESET A Terrestrial Digital TV signal 470MHz to 860MHz

FE_CN1

Fig. 3. Block diagram of proposed front-end module 3) Common Interface module The common interface (CI) module supports a reception limitation function for conditional access (CA), and supports the specifications of the PCMCIA (Personal Computer Memory Card International Association) interface. If no CA is used, the CA can be bypassed using an external resister, plus

J. S. Choi et al.: Design and Implementation of DVB-T Receiver System for Digital TV

the input and output signals of this module are an MPEG II TS. 4) AV filter module The AV filter module consists of an audio D/A & filter and video filter. When the processor and decoder module outputs a pulse code modulation (PCM) signal that is an audio signal, the audio D/A & filter converts the PCM signal to an analog signal via a D/A converter, then outputs a left and right signal as an audio signal. Meanwhile, when the processor and decoder module outputs a video signal, the video filter outputs a CVBS/YUV video signal.

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The developed system is compared with four other existing systems that use alternative modem chips from Conexant (A system), ST Microelectronics (B system), ATI (C system), and Zarlink (D system). Fig. 5 shows the configuration of the test equipment. A DVB-T modulator from Rohde & Schwarz is used as the transmitter with a 64-QAM constellation, 1/32 guard interval mode, code rate of 2/3, and bandwidth of 8 MHz. The data rate is 24.13 Mbps for this configuration. Plus, Eiden model 193F and HP 8592A are used to generate additive white Gaussian noise (AWGN) and for a signal analysis, respectively.

5) Supply module The supply module supplies the power from an analog TV board. After filtering, this module generates 2.5V, which is then supplied to the processor & decoder module using a regulator. This module consists of an external reset input, manual reset, and generating part that generates the reset signal to the whole DVB-T receiver system. 6) Memory module The memory module consists of a 256 kbit EEPROM that uses a I2C interface, 16 Mbit flash memory that uses an external memory interface (EMI), 64 Mbit system SDRAM that also uses an EMI, and 64 Mbit MPEG SDRAM that uses a shared memory interface (SMI).

(a) OFDM modulated signal generator

7) MISCellaneous (MISC) module The MISC module consists of an RS232 interface for the back panel interface, DCU interface using a JTAG port, front panel interface for debug display, and clock generator, where the input signals are an RS232 signal, JTAG signal, I2C signal, front panel signal, and clock signal of 27 MHz. B. Hardware Construction of DVB-T receiver The purpose of this research was to develop an optimum DVB-T receiver using off-the-shelf chips, such as an LSI Logic L64782 [14], Conexant Systems CX22700 [15], Motorola MC92314 [16], ST Microelectronics STV0360 [17], Zarlink MT352 [18], and ATI NXT6000 [19]. After an indepth study of the above chips, a suitable chip was selected and the developed DVB-T receiver is shown in Fig. 4.

Fig. 4. Developed DVB-T receiver

(b) Noise generator and spectrum analyzer Fig. 5. Configuration of test equipment C. Software construction A convenient and simple GUI interface was developed that can implement all the operations in the proposed system using remote control buttons. The proposed GUI consists of a basic setting menu and electronic program guide (EPG). Fig. 6 shows the structure of the software proposed in this research. As shown in Fig. 6, the proposed entire system consists of various tasks: 1) a tuner task for controlling the hardware tuner, 2) section filtering task for gathering the requisite data after filtering the stream received from the tuner, 3) database manager task for managing such gathered data, 4) NVM control task for recoding the main data in a nonvolatile random access memory (NVRam), 5) keyboard task for receiving the remote control input from a user, 6) user interface (USIF) task for displaying the GUI display screen, 7) segment display task

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for controlling the 7-segment output, and 8) teletext task for processing and displaying the teletext data. ARRAY OF CAPTURED SECTION DATA

SECTION DATA_ PACKETS DATA FLOW CONTROL FLOW MAILBO X SEMAPHOR E CIRCULA R BUFFER

ARRAY OF REMOTE KEY SCANCODE 1K

1

DATA BASE MANAGER (prior 7)

KEYBOARD PROCESS (prior 5)

SIGNAL

SI GN A

L

SECTON FILTERING (prior 9)

SIGNAL REMOTE KEYBOARD (PRIOR Symbol 5)

USIF (prior 8)

NVM (prior 3)

LINK handler ISR (6)

teletext (prior 10)

TUNER PROCESS (prior 5)

7-SEGMENT DISPLAY (prior 8)

Fig. 6. Structure of software 1) OSD construction To develop OSD cords, this paper proposes the concept of object oriented programming (OOP), where elements, such as boxes, text, and figures, that make up the display screen are divided as objects. As such, OSD cords are developed to construct the form of the menu based on compounding such objects. Plus, the proposed OSD cords can be re-used for the easy construction of various and complicated GUIs. Fig. 7 shows a display screen constructed using objects.

latter is the same as the OSD construction method mentioned above, while the former is shown in Fig. 8. In Fig. 8, the collection of EPG information and DB construction operation proceed in the following order: 1) A target service for extracting the EPG information is selected for the current receiving channel using a link in the Prog_Infor_Struct that maintains a service list. 2) After the target service is selected, a section filter task is used to transmit this information and request extraction of the event information table (EIT) information from the corresponding service. When the EIT information for the corresponding service is extracted, this is relayed by a message-type filter task, which is then recoded by the buffer using pointers and saved. 3) The requisite information is extracted by identifying the appropriate EIT section saved in the buffer using the pointers from the original message. The extracted information is then inserted in the pre-prepared structure and connected to the linked list when the writing is completed. Since the linked list header and length information is registered in the corresponding service information in the Prog_Info_Struct, approaching another task is also possible. 4) The time and data table (TDT) information is also periodically renewed and can be extracted using a section filter task. 5) The operation results are delivered in a message form in this process. 6) The TDT information is analyzed based on referring to the message information, plus the current time information is also renewed in this process. 7) An arrangement operation is performed at regular intervals to maintain the consistency of the EPG information, thereby removing the program information for a previous time or wrong information.

Frame_1 Programe Store Channel Lock on Audio

Frame_1

1

4

Programe Channel Lock on

1. WTK_CreateFrame()

Audio 3. WTK_InsertMenuToFrame()

Menu

Channel Lock on Audio 5. WTK_DeleteFrame()

2. WTK_CreateMenu()

Fig. 7. Screen construction using objects 2) Construction of Electronic Program Guide The proposed electronic program guide (EPG) shows detailed information on the programs broadcast on each channel, including the program being currently broadcast and the next program to be broadcast, displayed at the top of the screen. To display such detailed information, the proposed EPG mainly performs 2 kinds of operation: 1) an operation that constructs a database (DB) after collecting the requisite information from the received stream and 2) an operation that displays information on the screen using the constructed DB, where the

2

Section Filter Task

Program e Store

R Ex eq ue t ra s cti t on

Store

4. WTK_ShowFrame()

Extract section

Parse EIT section

e dat U p in f o G EP

8

3

e et pl m o r om f In n C o cti t ra 5 x E Request n io Ext ra ct

Ext ra

EPG info CleanUp EPG info

Menu

Request extractionof EIT section

Service Info List

Get Target fo Service In

In fo ctio rm 6 nC om p le te

Update Consistency

Request extractionof TDT section

Parse TDT section

Updat e TDT info

7

Last TDT info

EPG Info Gather Task

Fig. 8. Data flow for gathering EPG information and DB Construction IV. DEVELOPMENT RESULTS A. Development of DVB-T software A convenient and simple GUI interface that implements all the operations in the proposed system using remote control buttons was developed, consisting of a basic setting menu and

J. S. Choi et al.: Design and Implementation of DVB-T Receiver System for Digital TV

EPG. The basic setting menu was manufactured for European terrestrial DTV and includes 11 types of menu: 1) Auto Program, 2) Manual Program, 3) Store Program, 4) System Information, 5) Channel Lock, 6) Lock On/Off, 7) Set Password, 8) Audio Language, 9) Subtitles, 10) Datacasting, and 11) CI Information. 1) Auto Program The auto program in Fig. 9 automatically searches for analog and digital channels through the entire frequency bandwidth, and removes existing channel and program information. Thereafter, the new channel and program information is recoded to EEPROM.

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only viewed occasionally. The menu consists of a lock display, information display for channel and broadcasting services, and skip on/off function. As such, the store program can select certain desired channels from the searched channel and program information, and construct a database for up to 20 channels and 200 programs. Changes to this database are sent to the EEPROM. This menu shows simple information on the service list (program list), such as a channel lock, the local channel number, service name, UHF channel number, and skip flags.

Fig. 11. Store program

Fig. 9. Auto program This program allocates a bandwidth of 8 MHz for each channel, then searches for all the channels from RF channel CH21(474 MHz) to RF channel CH69 (858 MHz) in the order of the RF numbers. The auto program consists of a progress bar, text icon, message box for password, and message box.

4) Channel Lock Fig. 12 shows a channel lock. A channel lock is used when the user wants to limit the viewing of certain channels. As such, a user will be unable to view a locked channel unless a password is entered. If a specific program is locked, the form of lock is displayed in the cell and the program cannot be selected.

2) Manual Program The manual program in Fig. 10 manually searches for the desired RF channels from CH21(474 MHz) to CH69(474 MHz), then renews the channel and program information. To use this program, the user presses the up/down key on a remote control to search for a desired channel.

Fig. 12. Channel lock

Fig. 10. Manual Program 3) Store Program In the store program shown in Fig. 11, the user confirms the setting conditions by viewing the lists of recoded channel information. Moreover, the user can view brief information on each channel and determine to skip certain channels that are

5) Other basic setting menus in GUI The system information displays a version of the DTV operation program and receiving sensitivity of the signal. The Lock On/Off controls the on/off function of the lock. If this program is off, all programs can be viewed without regard to the setting value of the channel lock. Meanwhile, a user must input the correct password to turn-off a lock setting. The set password can be used to renew the password for the lock function. The audio language sets the desired basic languages in multi audio broadcasting, and selects one language from among English, Welsh and Gaelic. Subtitles determines whether or not the user sees caption broadcasting, and can be

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set to the same 3 languages as the audio language setting. Datacasting decides whether or not the user sees subtitles or teletext. CI Information reveals the condition of the module connected to the PCMCIA interface. 6) EPG implementation An EPG function was also developed that shows detailed information on programs to be broadcast on each channel to improve the interface between the DTV and the user. The construction of the EPG menu, as seen in Fig. 13, shows details of the program being currently broadcasting and the next program to be broadcast for each channel at the top of the display screen. As such, the EPG displays the program name, broadcasting time, genre, detailed description, and program list so that the user can decide to extract certain programs or view all programs. Moreover, the user can immediately change the display screen to view detailed information on a particular channel.

(a) Captured picture at 0.1 dB below minimum required C/N

(b) Captured picture at 0.2 dB below minimum required C/N Fig. 14. Displayed picture according to C/N Fig. 13. Menu structure of EPG

B. Development of DVB-T OFDM receiver To develop an optimal OFDM receiver for the DVB-T receiver system, the performance of the proposed system was compared with 4 other systems, all of which are end products, and the measured minimum required carrier-to-noise ratio (C/N) for each system is shown in Table I. The minimum required C/N was set at the lowest C/N providing error-free pictures in the display terminal for two minutes. In addition, the maximum carrier frequency offset to be compensated was decided at the minimum required C/N by changing the transmitting carrier frequency. Fig. 14 shows the captured pictures at 0.1 and 0.2 dB below the minimum required C/N.

Receiver model Minimum C/N Carrier frequency tracking range [kHz]

TABLE I C/N TEST RESULTS Implement A B ed system 16.4 16.3 16.6 dB dB dB

C

D

16.4 dB

16.5 dB

-290 ~270

-490 ~75

-130 ~150

-225 ~285

-290 ~280

Most of the tested systems showed similar C/N performances, yet the frequency tracking performances were very different from system to system. The proposed system, system A, and system B exhibited a relatively excellent carrier tracking performance. Meanwhile, although the total tracking frequency range for system C was similar to those for systems A and B, system C leaned towards a negative frequency, whereas system D had a small tracking range. However, all the tested systems can be commercialized, because the accuracy of the current tuner systems is less than ±100 kHz. The system proposed in this study exhibited a similar performance to systems A, B, C, and D, all of which were end products. This was because the proposed system was not neatly integrated in a PCB board. Since the tuner and baseband modem were interfaced with jumping wires, there may have been a performance degradation due to electromagnetic interference (EMI), as shown in Fig. 4. Thus, it was not a problem related to the receiver chip performance. Therefore, the proposed system is expected to produce an excellent performance with a superior carrier frequency acquisition performance when integrated in a PCB board. Furthermore, since most of the tested DVB-T chips showed very similar performances, the performance is highly dependent on the r.f. circuit technology.

J. S. Choi et al.: Design and Implementation of DVB-T Receiver System for Digital TV

C. Hardware development of DVB-T receiver system Fig. 15 shows the proposed DVB-T receiver system, while Fig. 16 shows a DTV system using the proposed DVB-T receiver system, which is applied as a built-in board. The proposed system amplifies the RF signal received by the TV antenna and reduces the noise, then decodes the signal into an audio/video signal and transmits it to an analog TV board. The system consists of a front-end, CI, processor & decoder, AV filter, supply, memory, and MISC. To implement the proposed DVB-T receiver system, the hardware design was realized based on the OFDM method, then the performance of the proposed system was confirmed through a basic function and performance evaluation.

Fig. 15. DVB-T receiver system

Fig. 16. DTV system with DVB-T receiver V. RESULTS OFDM is a kind of multi-carrier modulation technique that has proved useful under multipath conditions. Thus, to develop an optimal OFDM receiver system for a DTV receiver system, a DVB-T receiver system was developed that can be applied to a DTV system as a built-in board. In order to improve the reception performance, the proposed front-end module is developed using a tuner and demodulator, and the final output resolution of the proposed system is supported up to a high definition (HD). If we apply the proposed system to a DTV system, we are able to reduce the cost of the products, and to allow for easy expansion. The hardware was tested after manufacturing the proposed DVB-T receiver system. Plus, software was developed to

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create basic setting menus for a user friendly GUI and EPG. Moreover, since the developed system can be applied to various DTV sets, it is believed that the present research results will be useful for introducing the proposed DVB-T receiver system to the European market.

REFERENCES [1] European Telecommunication Standard ETS 300 468, “Digital Video Broadcasting (DVB); Specification for Service Information (SI) in DVB systems”, January 1997. [2] ETR(ETSI Technical Report), "Digital broadcasting systems for television, sound and data services; Allocation of Service Information (SI) codes for Digital Video Broadcasting(DVB) systems", ETR 162, October 1995. [3] J. A. C. Bingham, “Multicarrier modulation for data transmission: an idea whose time has come,” IEEE Commun. Mag., vol. 28, pp. 5-14, May 1990. [4] H. Sari, G. Karam, I. Jeanclaude, “Transmission techniques for digital terrestrial TV broadcasting,” IEEE Commun. Mag., vol. 33, pp. 100-109, Feb. 1995. [5] Rainer Makowitz et al., “A Single-Chip DVB-T Receiver”, IEEE Trans. Consumer Electronics, Vol. 44, No. 3, August 1998. [6] Mark Dawkins et al., “A Single-Chip Tuner for DVB-T”, IEEE Journal of Solid-State Circuits, Vol. 38, No. 8, August, 2003. [7] S. Anikhindi et al., “A Commercial DVB-T Demodulator Chipset”, International Broadcasting Convention, Conference Publication No. 447, IEE, September 1999. [8] Rainer Makowitz et al., “DVB-T Decoder ICs”, IEEE Trans. Consumer Electronics, Vol. 43, No. 3, August 1997. [9] W. Y. Zou, Yiyan Wu, “COFDM: an overview,” IEEE Trans. Broadcasting, vol. 41, pp. 1-8, Mar. 1995. [10] European Telecommunication Standard ETS 300 744, “Digital broadcasting systems for television, sound and data services; Framing structure, channel coding and modulation for digital terrestrial television,” May 1996. [11] ISO/IEC 13818-2: “International Standard MPEG-2 Video”. [12] ISO/IEC 13818-3, “International Standard MPEG-2 Audio”. [13]ISO/IEC 13818-7, “International Standard MPEG-2 Advanced Audio Coding (AAC)”. [14] Datasheet : L64782 DVB-T OFDM Demodulator, LSI Logic. [15] Datasheet : CX22700 Single-chip Solution for DVB-T Systems, Conexant Systems. [16] Datasheet : MC92314 DVB-T Single Chip Demodulator Application Note, Motorola. [17] Datasheet: STV0360 COFDM demodulator IC with A/D converter, ST Microelectronics. [18] Datasheet: Zarlink MT352 COFDM demodulator, Zarlink Semiconductor. [19] Datasheet: ATI NXT6000 DVB-T Receiver, ATI.

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Jae Seung Choi received the B. S. degree in Electronics Engineering from Chosun University, Gwangju, Korea, in 1989. And the M. S. and Ph. D. degrees in Information and Communication Engineering from Osaka City University, Osaka, Japan, in 1995 and 1999, respectively. From 2000 to 2001, he was a researcher with AVC Company of Matsushita Electric Industrial Co., Ltd., Osaka, Japan. Since 2002 he has been a project reader with Digital Technology Research Center of Kyungpook National University. His research interests are in the areas of DTV, speech signal and image processing. Joo Won Kim received the B.S. degree in Electronics from Kyung-book National University, Daegu, Korea, in 1986 the M.S. degree in Electronics from POSTECH, Pohang, Korea, in 1996. He is a member of the chief research engineer at the LG electronics, Kumi, Korea. His current research interests are in the areas of digital television system and embedded software. Dong Seog Han was born in Daegu, Korea on February 10, 1966. He received his B.S. degree from Kyungpook National University, Daegu, Korea, in 1987, his M.S. and Ph.D. degrees in Electrical Engineering from the Korea Advanced Institute of Science and Technology (KAIST), Daejon, Korea, in 1987 and 1993, respectively. From October 1987 to August 1996, he was with Samsung Electronics, Co., Ltd., where he developed the transmission systems for QAM HDTV and Grand Alliance HDTV receivers. Since September 1996, he joined the faculty of the School of Electronic and Electrical Engineering at Kyungpook National University, Daegu, Korea. His main research interests are digital communications, detection theory and digital signal processing.

Jae Yeal Nam received the B.S. and M.S. degrees in Electronics Engineering from Kyungpook National University, Taegu, Korea, in 1983 and 1985, respectively. And the Ph.D. degree in Electrical Engineering from University of Texas at Arlington in 1991. From 1985 to 1995, he was a senior member of research staff in the Video Communications Section of the Electronics and Telecommunications Research Institute (ETRI), Daejeon, Korea. He was taking part in the research of DTV/HDTV transmission codecs. Since 1995, he has been with the Keimyung University where he is currently associate professor in the Department of Computer Engineering. His research interests are in the areas of image and video compression and retrieval. Yeong Ho Ha received the B. S. and M. S. degrees in Electronic Engineering from Kyungpook National University, Taegu, Korea, in 1976 and 1978, respectively, and Ph. D. degree in Electrical and Computer Engineering from the University of Texas at Austin, Texas, 1985. In March 1986, he joined the Department of Electronic Engineering of Kyungpook National University, as an assistant professor, and is currently a professor. He served as TPC chair, member, and organizing committee chair of several IEEE, SPIE, and IS&T conferences including IEEE International Conference on Intelligent Signal Processing and Communication Systems(1994) and IEEE International Conference on Multimedia and Expo(ICME 2000). He is now chairman of IEEE Taegu section, vice president of the Institute of Electronics Engineering of Korea(IEEK), and president of Korea Society for Imaging Science and Technology(KSIST). He is a senior member of IEEE, and a member of Pattern Recognition Society and Society for IS&T. His main research interests are in color image processing, computer vision, and digital signal and image processing.

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