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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal DOI :
Electronics and Telecommunications Research Institute
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Volume & Issues
Volume 36, Issue 6 - Dec 2014
Volume 36, Issue 5 - Oct 2014
Volume 36, Issue 4 - Aug 2014
Volume 36, Issue 3 - Jun 2014
Volume 36, Issue 2 - Apr 2014
Volume 36, Issue 1 - Feb 2014
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Improving the Reception Performance of Legacy T-DMB/DAB Receivers in a Single-Frequency Network with Delay Diversity
Baek, Myung-Sun ; Lee, Yong-Hoon ; Hur, Namho ; Kim, Kyung-Seok ; Lee, Yong-Tae ;
ETRI Journal, volume 36, issue 2, 2014, Pages 188~196
DOI : 10.4218/etrij.14.2113.0045
This paper describes a simple delay diversity technique for terrestrial digital multimedia broadcasting (T-DMB) and digital audio broadcasting in a single-frequency network (SFN). For the diversity technique, a delay diversity scheme is adopted. In the delay diversity scheme, a non-delayed signal is transmitted in the first antenna, and delayed versions of the signal are transmitted in each additional antenna. For an SFN environment with multiple transmitters, delay diversity can be executed by controlling the emission times of the transmitters. This SFN delay diversity scheme does not require any hardware changes in either the transmitter or receiver, and perfect backward compatibility can be acquired. To evaluate the performance improvement, laboratory tests are executed with various types of commercial T-DMB receivers as well as a measurement receiver. The improvement in the bit error rate performance is evaluated using a measurement receiver, and an improvement of the threshold of visibility value is evaluated for commercial receivers. Test results show that the T-DMB system can obtain diversity gain using the described technique.
Dynamic Resource Allocation and Scheduling for Cloud-Based Virtual Content Delivery Networks
Um, Tai-Won ; Lee, Hyunwoo ; Ryu, Won ; Choi, Jun Kyun ;
ETRI Journal, volume 36, issue 2, 2014, Pages 197~205
DOI : 10.4218/etrij.14.2113.0085
This paper proposes a novel framework for virtual content delivery networks (CDNs) based on cloud computing. The proposed framework aims to provide multimedia content delivery services customized for content providers by sharing virtual machines (VMs) in the Infrastructure-as-a-Service cloud, while fulfilling the service level agreement. Furthermore, it supports elastic virtual CDN services, which enables the capabilities of VMs to be scaled to encompass the dynamically changing resource demand of the aggregated virtual CDN services. For this, we provide the system architecture and relevant operations for the virtual CDNs and evaluate the performance based on a simulation.
16-QAM OFDM-Based W-Band Polarization-Division Duplex Communication System with Multi-gigabit Performance
Kim, Kwang Seon ; Kim, Bong-Su ; Kang, Min-Soo ; Byun, Woo-Jin ; Park, Hyung Chul ;
ETRI Journal, volume 36, issue 2, 2014, Pages 206~213
DOI : 10.4218/etrij.14.2113.0083
This paper presents a novel 90 GHz band 16-quadrature amplitude modulation (16-QAM) orthogonal frequency-division multiplexing (OFDM) communication system. The system can deliver 6 Gbps through six channels with a bandwidth of 3 GHz. Each channel occupies 500 MHz and delivers 1 Gbps using 16-QAM OFDM. To implement the system, a low-noise amplifier and an RF up/down conversion fourth-harmonically pumped mixer are implemented using a
gallium arsenide pseudomorphic high-electron-mobility transistor process. A polarization-division duplex architecture is used for full-duplex communication. In a digital modem, OFDM with 256-point fast Fourier transform and (255, 239) Reed-Solomon forward error correction codecs are used. The modem can compensate for a carrier-frequency offset of up to 50 ppm and a symbol rate offset of up to 1 ppm. Experiment results show that the system can achieve a bit error rate of
at a signal-to-noise ratio of about 19.8 dB.
A Fully-Integrated Penta-Band Tx Reconfigurable Power Amplifier with SOI CMOS Switches for Mobile Handset Applications
Kim, Unha ; Kang, Sungyoon ; Kim, Junghyun ; Kwon, Youngwoo ;
ETRI Journal, volume 36, issue 2, 2014, Pages 214~223
DOI : 10.4218/etrij.14.2113.0046
A fully-integrated penta-band reconfigurable power amplifier (PA) is developed for handset Tx applications. The output structure of the proposed PA is composed of the fixed output matching network, power and frequency reconfigurable networks, and post-PA distribution switches. In this work, a new reconfiguration technique is proposed for a specific band requiring power and frequency reconfiguration simultaneously. The design parameters for the proposed reconfiguration are newly derived and applied to the PA. To reduce the module size, the switches of reconfigurable output networks and post-PA switches are integrated into a single IC using a
silicon-on-insulator CMOS process, and a compact size of
is thus achieved. The fabricated W-CDMA PA module shows adjacent channel leakage ratios better than -39 dBc up to the rated linear power and power-added efficiencies of higher than around 38% at the maximum linear output power over all the bands. Efficiency degradation is limited to 2.5% to 3% compared to the single-band reference PA.
Sensorial Information Extraction and Mapping to Generate Temperature Sensory Effects
Kim, Sang-Kyun ; Yang, Seung-Jun ; Ahn, Chung Hyun ; Joo, Yong Soo ;
ETRI Journal, volume 36, issue 2, 2014, Pages 224~231
DOI : 10.4218/etrij.14.2113.0065
In this paper, a method to extract temperature effect information using the color temperatures of video scenes with mapping to temperature effects is proposed to author temperature effects of multiple sensorial media content automatically. An authoring tool to apply the proposed method is also introduced. The temperature effects generated by the proposed method are evaluated by a subjective test to measure the level of satisfaction. The mean opinion score results show that most of the test video sequences receive an average of approximately four points (in a five-point scale), indicating that test video sequences (with the temperature effects generated by the proposed method) enhance levels of satisfaction.
Digital Holographic Display System with Large Screen Based on Viewing Window Movement for 3D Video Service
Park, Minsik ; Chae, Byung Gyu ; Kim, Hyun-Eui ; Hahn, Joonku ; Kim, Hwi ; Park, Cheong Hee ; Moon, Kyungae ; Kim, Jinwoong ;
ETRI Journal, volume 36, issue 2, 2014, Pages 232~241
DOI : 10.4218/etrij.14.2113.0086
A holographic display system with a 22-inch LCD panel is developed to provide a wide viewing angle and large holographic 3D image. It is realized by steering a narrow viewing window resulting from a very large pixel pitch compared to the wave length of the laser light. Point light sources and a lens array make it possible to arbitrarily control the position of the viewing window for a moving observer. The holographic display provides both eyes of the observer with a holographic 3D image using two vertically placed LCD panels and a beam splitter to support the holographic stereogram.
Post-processing of 3D Video Extension of H.264/AVC for a Quality Enhancement of Synthesized View Sequences
Bang, Gun ; Hur, Namho ; Lee, Seong-Whan ;
ETRI Journal, volume 36, issue 2, 2014, Pages 242~252
DOI : 10.4218/etrij.14.2113.0082
Since July of 2012, the 3D video extension of H.264/AVC has been under development to support the multi-view video plus depth format. In 3D video applications such as multi-view and free-view point applications, synthesized views are generated using coded texture video and coded depth video. Such synthesized views can be distorted by quantization noise and inaccuracy of 3D wrapping positions, thus it is important to improve their quality where possible. To achieve this, the relationship among the depth video, texture video, and synthesized view is investigated herein. Based on this investigation, an edge noise suppression filtering process to preserve the edges of the depth video and a method based on a total variation approach to maximum a posteriori probability estimates for reducing the quantization noise of the coded texture video. The experiment results show that the proposed methods improve the peak signal-to-noise ratio and visual quality of a synthesized view compared to a synthesized view without post processing methods.
Visual-Attention-Aware Progressive RoI Trick Mode Streaming in Interactive Panoramic Video Service
Seok, Joo Myoung ; Lee, Yonghun ;
ETRI Journal, volume 36, issue 2, 2014, Pages 253~263
DOI : 10.4218/etrij.14.2113.0012
In the near future, traditional narrow and fixed viewpoint video services will be replaced by high-quality panorama video services. This paper proposes a visual-attention-aware progressive region of interest (RoI) trick mode streaming service (VA-PRTS) that prioritizes video data to transmit according to the visual attention and transmits prioritized video data progressively. VA-PRTS enables the receiver to speed up the time to display without degrading the perceptual quality. For the proposed VA-PRTS, this paper defines a cutoff visual attention metric algorithm to determine the quality of the encoded video slice based on the capability of visual attention and the progressive streaming method based on the priority of RoI video data. Compared to conventional methods, VA-PRTS increases the bitrate saving by over 57% and decreases the interactive delay by over 66%, while maintaining a level of perceptual video quality. The experiment results show that the proposed VA-PRTS improves the quality of the viewer experience for interactive panoramic video streaming services. The development results show that the VA-PRTS has highly practical real-field feasibility.
Repetitive Delivery Scheme for Left and Right Views in Service-Compatible 3D Video Service
Yun, Kugjin ; Cheong, Won-Sik ; Lee, Jinyoung ; Kim, Kyuheon ; Lee, Gwangsoon ; Hur, Namho ;
ETRI Journal, volume 36, issue 2, 2014, Pages 264~270
DOI : 10.4218/etrij.14.2113.0043
This paper introduces a novel repetitive delivery scheme for the left and right views in service-compatible (SC) 3D video that provides full backward compatibility to a legacy DTV system while retaining HD 3D visual quality without additional bandwidth or a codec over the legacy broadcasting channel. The proposed SC delivery scheme transmits individual view sequences of a 3D video in interlaced form, that is, a left-view sequence of a 3DTV program to be used repeatedly is transmitted first and stored locally, and the right-view sequence of the 3D program is then transmitted. This paper specifically describes the signaling, synchronization, and storage format methods used to validate the proposed SC delivery scheme. The experiment results show that the proposed SC delivery scheme can be effectively applied for an SC 3DTV service without degrading the DTV quality using only legacy DTV platforms.
Synchronous 2D/3D Switching System for Service-Compatible 3DTV Broadcasting
Kim, Sangjin ; Jeon, Taehyun ;
ETRI Journal, volume 36, issue 2, 2014, Pages 271~279
DOI : 10.4218/etrij.14.2113.0035
This paper proposes a new broadcasting system for the service-compatible 3DTV in which the 3D service can coexist with the conventional digital TV broadcast. In the proposed system, the commercial 3DTV service can be implemented via the existing DTV channel without utilizing the dedicated 3DTV system. This 2D/3D system interworks with the conventional system and can switch to 2D or 3D service according to the broadcast programming and schedule. The system also provides a mechanism that can prevent the synchronization mismatch between left and right video streams and between the stream and the associated signaling in the 2D/3D transition periods. The picture quality measurements are carried out based on the ITU-R recommended test to check the level of quality of service provided by the proposed scheme. The conformity tests are also performed with the conventional channel and the receiver for the DTV system to confirm the feasibility of the proposed one for the commercial service.
Optimal Power Control in Cooperative Relay Networks Based on a Differential Game
Xu, Haitao ; Zhou, Xianwei ;
ETRI Journal, volume 36, issue 2, 2014, Pages 280~285
DOI : 10.4218/etrij.14.0113.0434
In this paper, the optimal power control problem in a cooperative relay network is investigated and a new power control scheme is proposed based on a non-cooperative differential game. Optimal power allocated to each node for a relay is formulated using the Nash equilibrium in this paper, considering both the throughput and energy efficiency together. It is proved that the non-cooperative differential game algorithm is applicable and the optimal power level can be achieved.
Stopband-Extended and Size-Miniaturized Low-Pass Filter with Three Transmission Zeros
Li, Lin ; Bao, Jia ; Du, Jing-Jing ; Wang, Yaming ;
ETRI Journal, volume 36, issue 2, 2014, Pages 286~292
DOI : 10.4218/etrij.14.0113.0430
This paper presents a compact structure composed of an upper high-impedance transmission line, a middle extended parallel coupled line, and a pair of inter-coupled symmetrical stepped impedance stubs. Detailed investigation into this structure based on an equivalent circuit analysis reveals that this proposed structure exhibits a quasi-elliptic low-pass filtering response with three transmission zeros. Moreover, the positions of the three transmission zeros can be tuned and reallocated flexibly by choosing the proper circuit parameters. Finally, the design concept is validated through the design, fabrication, and measurement of two exemplary low-pass filters (LPFs) with one single unit and two cascaded asymmetric units. The measured results agree well with the simulated results. In addition, in the range of
, the fabricated quasi-elliptic LPFs experimentally demonstrate a very wide upper-stopband of 20 dB using a compact size of only
is the guided wavelength of a
transmission line at the central frequency.
A New Multi-site Test for System-on-Chip Using Multi-site Star Test Architecture
Han, Dongkwan ; Lee, Yong ; Kang, Sungho ;
ETRI Journal, volume 36, issue 2, 2014, Pages 293~300
DOI : 10.4218/etrij.14.0113.0469
As the system-on-chip (SoC) design becomes more complex, the test costs are increasing. One of the main obstacles of a test cost reduction is the limited number of test channels of the ATE while the number of pins in the design increases. To overcome this problem, a new test architecture using a channel sharing compliant with IEEE Standard 1149.1 and 1500 is proposed. It can significantly reduce the pin count for testing a SoC design. The test input data is transmitted using a test access mechanism composed of only input pins. A single test data output pin is used to measure the sink values. The experimental results show that the proposed architecture not only increases the number of sites to be tested simultaneously, but also reduces the test time. In addition, the yield loss owing to the proven contact problems can be reduced. Using the new architecture, it is possible to achieve a large test time and cost reduction for complex SoC designs with negligible design and test overheads.
Dynamic Self-Repair Architectures for Defective Through-silicon Vias
Yang, Joon-Sung ; Han, Tae Hee ; Kobla, Darshan ; Ju, Edward L. ;
ETRI Journal, volume 36, issue 2, 2014, Pages 301~308
DOI : 10.4218/etrij.14.0113.0578
Three-dimensional integration technology results in area savings, platform power savings, and an increase in performance. Through-silicon via (TSV) assembly and manufacturing processes can potentially introduce defects. This may result in increases in manufacturing and test costs and will cause a yield problem. To improve the yield, spare TSVs can be included to repair defective TSVs. This paper proposes a new built-in self-test feature to identify defective TSV channels. For defective TSVs, this paper also introduces dynamic self-repair architectures using code-based and hardware-mapping based repair.
A Compact UWB and Bluetooth Slot Antenna for MIMO/Diversity Applications
Gao, Peng ; He, Shuang ;
ETRI Journal, volume 36, issue 2, 2014, Pages 309~312
DOI : 10.4218/etrij.14.0213.0270
A novel compact pattern diversity slot antenna for ultra-wideband (UWB) and Bluetooth applications is presented. This antenna consists of two modified coplanar waveguides that feed staircase-shaped radiating elements, wherein two different fork-like stubs are placed at the
axis. The measured results show that this proposed antenna operates from 2.3 GHz to 12.5 GHz, covering Bluetooth, WLAN, WiMAX, and UWB. The performance of radiation patterns and the corresponding envelope correlation coefficient prove this antenna is suitable for MIMO/diversity systems. Also, the antenna's compact size makes it a good candidate for portable devices.
Transmission Power Control for IEEE 802.15.6 Body Area Networks
Gao, Weidong ; Jiao, Bingli ; Yang, Guiliang ; Hu, Wei ; Liu, Jingwen ;
ETRI Journal, volume 36, issue 2, 2014, Pages 313~316
DOI : 10.4218/etrij.14.0213.0220
Energy consumption is an important issue in body area networks (BANs). In this letter, we propose an energy efficient transmission power control scheme for IEEE 802.15.6 BANs, which can improve energy efficiency by adaptively adjusting the transmit power in an on-demand way to adapt to varying channel environments. Simulations are performed to evaluate the performance, and it is shown that the proposed power control scheme outperforms traditional ones in terms of energy efficiency without significant reliability degradation.
Balanced RF Duplexer with Low Interference Using Hybrid BAW Resonators for LTE Application
Shin, Jea-Shik ; Song, Insang ; Kim, Chul-Soo ; Lee, Moon-Chul ; Son, Sang Uk ; Kim, Duck-Hwan ; Park, Ho-Soo ; Hwang, Sungwoo ; Rieh, Jae-Sung ;
ETRI Journal, volume 36, issue 2, 2014, Pages 317~320
DOI : 10.4218/etrij.14.0213.0219
A balanced RF duplexer with low interference in an extremely narrow bandgap is proposed. The Long-Term Evolution band-7 duplexer should be designed to prevent the co-existence problem with the WiFi band, whose fractional bandgap corresponds to only 0.7%. By implementing a hybrid bulk acoustic wave (BAW) structure, the temperature coefficient of frequency (TCF) value of the duplexer is successfully reduced and the suppressed interference for the narrow bandgap is performed. To achieve an RF duplexer with balanced Rx output topology, we also propose a novel balanced BAW Rx topology and RF circuit block. The novel balanced Rx filter is designed with both lattice- and ladder-type configurations to ensure excellent attenuation. The RF circuit block, which is located between the antenna and the Rx filter, is developed to simultaneously function as a balance-tounbalance transformer and a phase shift network. The size of the fabricated duplexer is as small as
. The maximum insertion loss of the duplexer is as low as 2.4 dB in the Tx band, and the minimum attenuation in the WiFi band is as high as 36.8 dB. The TCF value is considerably lowered to
Robust Two-Phase Clock Oxide TFT Shift Register over Threshold Voltage Variation and Clock Coupling Noises
Nam, Hyoungsik ; Song, Eunji ;
ETRI Journal, volume 36, issue 2, 2014, Pages 321~324
DOI : 10.4218/etrij.14.0213.0228
This letter describes a two-phase clock oxide thin-film transistor shift register that executes a robust operation over a wide threshold voltage range and clock coupling noises. The proposed circuit employs an additional Q generation block to avoid the clock coupling noise effects. A SMART-SPICE simulation shows that the stable shift register operation is established for the clock coupling noises and the threshold voltage variation from -4 V to 5 V at a line time of
. The magnitude of coupling noises on the Q(15) node and Qb(15) node of the 15th stage is respectively -12.6 dB and -26.1 dB at 100 kHz in the proposed circuit, compared to 6.8 dB and 10.9 dB in a conventional one. In addition, the estimated power consumption is 1.74 mW for the proposed 16-stage shift registers at
, compared to 11.5 mW for the conventional circuits.
A Modified Reversible Data Hiding in Encrypted Images Using Random Diffusion and Accurate Prediction
Li, Ming ; Xiao, Di ; Peng, Zhongxian ; Nan, Hai ;
ETRI Journal, volume 36, issue 2, 2014, Pages 325~328
DOI : 10.4218/etrij.14.0213.0449
A modified version of Zhang's reversible data hiding method in encrypted images is proposed in this letter. To make full use of spatial correlation in natural images, the former idea of block division is thoroughly abandoned, whereas the random diffusion strategy is used. Additionally, the fluctuation measurement of pixels containing embedded data is improved by accurate prediction. The experiment results reveal that our proposed method is superior to both Zhang's method and the later improved version proposed by Hong and others.
Estimation of Physical Layer Scrambling Code Sequence of DVB-S2
Wu, Hao ; Xie, Hui ; Huang, Zhi-Tao ; Zhou, Yi-Yu ;
ETRI Journal, volume 36, issue 2, 2014, Pages 329~332
DOI : 10.4218/etrij.14.0213.0444
In this letter, the problem of estimating the physical layer (PL) scrambling code sequence of DVB-S2 is studied. We present the first ever scheme to estimate the scrambling sequence. The scheme is based on hypothesis testing. By analyzing the PL scrambling process, we construct a new sequence equivalent to the scrambling sequence. We then use hypothesis testing to estimate the new sequence. The threshold for the hypothesis testing is also discussed. The experiment results show that the performance of our estimation scheme can work even under high BER.