Electronics and Telecommunication Research Institute

Displaying 1-40 of 137 results

  • White Papers // Jun 2012

    Interference Management With Block Diagonalization for Macro/Femto Coexisting Networks

    A femtocell is a small cellular base station, typically designed for use in a home or small business. The random deployment of a femtocell has a critical effect on the performance of a macrocell network due to co-channel interference. Utilizing the advantage of a multiple-input multiple-output system, each Femto Base...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Jun 2012

    Analyzing the Economic Effect of Mobile Network Sharing in Korea

    As mobile markets in most developed countries are rapidly coming close to saturation, it is increasingly challenging to cover the cost of providing the network, as revenues are not growing. This has driven mobile operators, thus far mostly involved in facility-based competition, to turn their attention to network sharing. There...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Jun 2012

    Closed-Loop Transmit Diversity Techniques for Small Wireless Terminals and Their Performance Assessment in a Flat Fading Channel

    Closed-loop transmit diversity is considered an important technique for improving the link budget in the third generation and future wireless communication standards. This paper proposes several transmit diversity algorithms suitable for small wireless terminals and presents performance assessment in terms of average Signal-to-Noise Ratio (SNR) and outage improvement, convergence, and...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Jun 2012

    Scate: A Scalable Time and Energy Aware Actor Task Allocation Algorithm in Wireless Sensor and Actor Networks

    In many applications of Wireless Sensor Actor Networks (WSANs) that often run in harsh environments, the reduction of completion times of tasks is highly desired. The authors present a new time-aware, energy-aware, and starvation-free algorithm called Scate for assigning tasks to actors while satisfying the scalability and distribution requirements of...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Jun 2012

    Multimedia Service Discrimination Based on Fair Resource Allocation Using Bargaining Solutions

    The authors deal with a resource allocation problem for multimedia service discrimination in wireless networks. They assume that a service provider allocates network resources to users who can choose and access one of the discriminated services. To express the rational service selection of users, the utility function of users is...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Jun 2012

    Low-Cost, Low-Power, High-Capacity 3R OEO-Type Reach Extender for a Long-Reach TDMA-PON

    This paper proposes a low-cost, low-power, and high-capacity optical-electrical-optical-type reach extender that can provide 3R frame regeneration and remote management to increase the reach and split ratio with no change to a legacy time division multiple access passive optical network. To provide remote management, the extender gathers information regarding optical...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Jun 2012

    High-Frequency Modeling and Optimization of E/O Response and Reflection Characteristics of 40 Gb/s EML Module for Optical Transmitters

    A complete high-frequency small-signal circuit model of a 40 Gb/s butterfly electro-absorption modulator integrated laser module is presented for the first time to analyze and optimize its Electro-Optic (E/O) response and reflection characteristics. An agreement between measured and simulated results demonstrates the accuracy and validity of the procedures. By optimizing...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Jun 2012

    Modified RHKF Filter for Improved DR/GPS Navigation Against Uncertain Model Dynamics

    In this paper, an error compensation technique for a Dead Reckoning (DR) system using a magnetic compass module is proposed. The magnetic compass-based azimuth may include a bias that varies with location due to the surrounding magnetic sources. In this paper, the DR system is integrated with a Global Positioning...

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  • White Papers // Jun 2012

    High-Quality and Robust Reversible Data Hiding by Coefficient Shifting Algorithm

    This paper presents two reversible data hiding schemes based on the Coefficient Shifting (CS) algorithm. The first scheme uses the CS algorithm with a mean predictor in the spatial domain to provide a large payload while minimizing distortion. To guard against manipulations, the second scheme uses a robust version of...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Oct 2011

    Handover Ranging Power Adjustment Using Uplink Channel Information in IEEE 802.16e/m

    This paper proposes a handover ranging power adjustment scheme to improve handover performance. Incorrect ranging power can degrade handover performance due to the increased handover latency; therefore, the proposed scheme exploits the uplink channel information to adjust the uplink handover ranging power. Simulation results demonstrate that the proposed scheme reduces...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Dec 2010

    A Low-Complexity Planar Antenna Array for Wireless Communication Applications: Robust Source Localization in Impulsive Noise

    This paper proposes robust source localization methods for estimating the azimuth angle, elevation angle, velocity, and range using a low-complexity planar antenna array in impulsive non-Gaussian noise environments. The proposed robust source localization methods for wireless communication applications are based on nonlinear M-estimation provided from Huber and Hampel. Simulation results...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Dec 2010

    Statistical Analysis of a Subjective QoE Assessment for VVoIP Applications

    A successful deployment of multimedia applications over wireless environments entails improving the Quality of Service (QoS), not only from a technical point of view, but also considering the Quality of Experience (QoE) from the final user's perception. Although objective QoE measure models avoid the difficulties of subjective surveys, subjective QoE...

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  • White Papers // Dec 2010

    Measurement Scheme for One-Way Delay Variation With Detection and Removal of Clock Skew

    One-Way Delay Variation (OWDV) has become increasingly of interest to researchers as a way to evaluate network state and service quality, especially for real-time and streaming services such as Voice-over-Internet-Protocol (VoIP) and video. Many schemes for OWDV measurement require clock synchronization through the Global-Positioning System (GPS) or network time protocol....

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  • White Papers // Dec 2010

    Reducing Channel Capacity for Scalable Video Coding in a Distributed Network

    In recent years, the development of multimedia devices has meant that a wider multimedia streaming service can be supported, and there are now many ways in which TV channels can communicate with different terminals. Generally, scalable video streaming is known to provide more efficient channel capacity than simulcast video streaming....

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  • White Papers // Dec 2010

    Concentric Circle-Based Image Signature for Near-Duplicate Detection in Large Databases

    Many applications dealing with image management need a technique for removing duplicate images or for grouping related (near-duplicate) images in a database. This paper proposes a concentric circle-based image signature which makes it possible to detect near-duplicates rapidly and accurately. An image is partitioned by radius and angle levels from...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Dec 2010

    Rack-Level DC Power Solution for Volume Servers

    Rack-level DC power supply is the optimal technology for providing DC power to a volume server without any power infrastructure changes in an existing AC data center. In this paper, the authors propose a smartly controllable and monitorable DC rack power system. The proposed system improves power efficiency by changing...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Dec 2010

    Secure Face Authentication Framework in Open Networks

    In response to increased security concerns, biometrics is becoming more focused on overcoming or complementing conventional knowledge and possession-based authentication. However, biometric authentication requires special care since the loss of biometric data is irrecoverable. In this paper, the authors present a biometric authentication framework, where several novel techniques are applied...

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  • White Papers // Dec 2010

    Efficient Multiplexing Scheme of Stereoscopic Video Sequences for Digital Broadcasting Services

    This paper introduces a stereoscopic video broadcasting system that provides 3D visual service and has full backward compatibility with legacy Digital TeleVision (DTV) service in the same channel capacity. The proposed stereoscopic video broadcasting system in this paper is composed of both a hybrid codec and a multiplexer with a...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Dec 2010

    Chip Impedance Evaluation Method for UHF RFID Transponder ICs Over Absorbed Input Power

    Based on a de-embedding technique, a new method is proposed which is capable of evaluating chip impedance behavior over absorbed power in flip-chip bonded UHF radio frequency identification transponder ICs. For the de-embedding, four compact co-planar test fixtures, an equivalent circuit for the fixtures, and a parameter extraction procedure for...

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  • White Papers // Oct 2010

    OPRoS: A New Component-Based Robot Software Platform

    A component is a reusable and replaceable software module accessed through its interface. Component-based development is expected to shorten the development period, reduce maintenance costs, and improve program reusability and the interoperability of components. This paper proposes a new robot software component platform in order to support the entire process...

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  • White Papers // Oct 2010

    Hardware-Aware Rate Monotonic Scheduling Algorithm for Embedded Multimedia Systems

    Many embedded multimedia systems employ special hardware blocks to co-process with the main processor. Even though an efficient handling of such hardware blocks is critical on the overall performance of real-time multimedia systems, traditional real-time scheduling techniques cannot afford to guarantee a high quality of multimedia playbacks with neither delay...

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  • White Papers // Oct 2010

    Content Protective Multi-Agent Platform for MsMu Service and Pattern-Based Content Management

    Recent research on mobile Internet protocol television and Digital Right Management (DRM) interconnections has focused on multimedia technologies designed to enhance content scalability and adaptive content distribution. However, due to the architectural and scalable limitations, recent systems are not flexible and securable with respect to their adaptive content distribution and...

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  • White Papers // Oct 2010

    A Novel Approach for Mining High-Utility Sequential Patterns in Sequence Databases

    Mining sequential patterns is an important research issue in data mining and knowledge discovery with broad applications. However, the existing sequential pattern mining approaches consider only binary frequency values of items in sequences and equal importance/significance values of distinct items. Therefore, they are not applicable to actually represent many real-world...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Oct 2010

    Virtual Reality Content-Based Training for Spray Painting Tasks in the Shipbuilding Industry

    Training is one of the representative application fields of virtual reality technology where users can have virtual experience in a training task and working environment. Widely used in the medical and military fields, virtual reality-based training systems are also useful in industrial fields, such as the aerospace industry, since they...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Oct 2010

    A Robust Mutual Authentication Protocol for Wireless Sensor Networks

    Authentication is an important service in Wireless Sensor Networks (WSNs) for an unattended environment. Recently, Das proposed a hash-based authentication protocol for WSNs, which provides more security against the masquerade, stolen-verifier, replay, and guessing attacks and avoids the threat which comes with having many logged-in users with the same login-id....

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Oct 2010

    Disguised-Face Discriminator for Embedded Systems

    In this paper, the authors introduce an improved Adaptive Boosting (AdaBoost) classifier and its application, a disguised-face discriminator that discriminates between bare and disguised faces. The proposed classifier is based on an AdaBoost learning algorithm and regression technique. In the process, the lookup table of AdaBoost learning is utilized. The...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Oct 2010

    Joint Channel Coding Based on Principal Component Analysis

    This paper proposes a new joint channel coding algorithm based on principal component analysis. A conventional joint channel coder using passive downmixing undergoes a reduction of both the Primary-to-Ambient energy Ratio (PAR) of the downmix signal and the panning gain ratio of the primary source. The proposed system preserves the...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Aug 2010

    On-Chip Bus Serialization Method for Low-Power Communications

    One of the critical issues in on-chip serial communications is increased power consumption. In general, serial communications tend to dissipate more energy than parallel communications due to bit multiplexing. This paper proposes a low-power bus serialization method. This encodes bus signals prior to serialization so that they are converted into...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Aug 2010

    Adaptive Cooperative Spectrum Sharing Based on Fairness and Total Profit in Cognitive Radio Networks

    A cooperative model is presented to enable sharing of the spectrum with secondary users. Compared with the optimal model and competitive model, the cooperative model could reach the maximum total profit for secondary users with better fairness. The cooperative model is built based on the Nash equilibrium. Then a conceding...

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  • White Papers // Aug 2010

    Channel Estimation and LDPC Code Puncturing Schemes Based on Incremental Pilots for OFDM

    In this paper, the authors propose a channel estimation algorithm based on incremental pilots. These are pilots additionally inserted after puncturing the modulated Orthogonal Frequency Division Multiplexing (OFDM) symbols to enhance channel estimation performance without lowering bandwidth efficiency. A low-density parity-check code puncturing scheme is also proposed to prevent the...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Aug 2010

    Design for a Dual-Frequency Antenna-in-Package

    For an Antenna-in-Package (AiP), via holes are used to connect the antenna ground and system ground. In this paper, a dual-frequency AiP with a U-slot embedded in the patch is proposed. By properly arranging three via holes under the non-radiating edge, an AiP with two resonant frequencies is realized. Then...

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  • White Papers // Aug 2010

    Broadband Stacked Patch Antenna With Low VSWR and Low Cross-Polarization

    A low cross-polarization broadband stacked patch antenna is proposed. By means of the stacked patch configuration and probe-fed strip feed technique, the VSWR 1.2:1 bandwidth of the patch antenna is enhanced to 22% from 804 MHz to 1,002 MHz, which outperforms the other available patch antennas (

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Aug 2010

    Scalable Path Computation Flooding Approach for PCE-Based Multi-Domain Networks

    In this paper, the authors assess the scalability of a Path Computation Flooding (PCF) approach to compute optimal end-to-end inter-domain paths in a path computation element-based multi-domain network. PCF yields a drastically reduced network blocking probability compared to a blind per-domain path computation but introduces significant network control overhead and...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Aug 2010

    Enhanced Block-Based Adaptive Loop Filter With Multiple Symmetric Structures for Video Coding

    In this paper, the authors present an Enhanced Block-based Adaptive Loop Filter (E-BALF) with multiple filter symmetric structures. The E-BALF adapts various filter symmetric structures in a rate-distortion optimization sense, reflecting the statistical properties of each image in a video sequence. Experimental results show that the proposed method achieves a...

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  • White Papers // Aug 2010

    Dynamic Collaborative Cloud Service Platform: Opportunities and Challenges

    This paper presents a model for a Dynamic Collaboration (DC) platform among Cloud Providers (CPs) that prevents adverse business impacts, cloud vendor lock-in and violation of service level agreements with consumers, and also offers collaborative cloud services to consumers. The authors consider two major challenges. The first challenge is to...

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  • White Papers // Aug 2010

    Design and Implementation of a Latency Efficient Encoder for LTE Systems

    The operation time of an encoder is one of the critical implementation issues for satisfying the timing requirements of Long Term Evolution (LTE) systems because the encoder is based on binary operations. In this paper, the authors propose a design and implementation of a latency efficient encoder for LTE systems....

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  • White Papers // Aug 2010

    Low-Cost High-Performance TDD Synchronizer for WiBro RF Repeater

    WiBro Radio Frequency (RF) repeater is used for solving the problem of partial shadow areas in the wireless communication field that uses Time-Division Duplexing (TDD) mode. In this paper, a method to efficiently generate TDD signals for WiBro RF repeater is proposed and its digital circuit is implemented. A TDD...

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  • White Papers // Jun 2010

    Non-Data-Aided Weighted Non-Coherent Receiver for IR-UWB PPM Signals

    This paper proposes an energy-detection-based Non-Data Aided Weighted Non-Coherent Receiver (NDA-WNCR) scheme for Impulse Radio Ultra-WideBand (IR-UWB) pulse-position modulated signals. Compared to the conventional WNCR, the optimal weights of the proposed NDA-WNCR are tremendously simplified as the maximum eigenvector of the IRUWB signal energy sample autocorrelation matrix. The NDAWNCR serves...

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  • White Papers // Jun 2010

    Multiband Meandered Monopole Antenna for Mobile Applications

    A multiband meandered monopole antenna is proposed for Digital Video Broadcasting Handheld (DVB-H), global positioning system, personal communications service, Wireless broadband (Wibro), and Wireless Local Area Network (WLAN) applications. The proposed antenna consists of a meandered line, a shorted length strip line, and a conductor strip between a meandered line...

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  • White Papers // Jun 2010

    Augmented Rotation-Based Transformation for Privacy-Preserving Data Clustering

    Multiple Rotation-Based Transformation (MRBT) was introduced recently for mitigating the Apriori-Knowledge Independent Component Analysis (AK-ICA) attack on Rotation-Based Transformation (RBT), which is used for privacy-preserving data clustering. MRBT is shown to mitigate the AK-ICA attack but at the expense of data utility by not enabling conventional clustering. In this paper,...

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  • White Papers // Jun 2009

    Multiband Microstrip-Fed Right Angle Slot Antenna Design for Wireless Communication Systems

    The steadily increasing popularity of Internet access and multimedia applications has driven a rapid development of wireless communication systems. It has been noted that a wireless communication device provides the ability to integrate multiband. Therefore, a multiband antenna is attractive in many commercial applications as it is designed to have...

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  • White Papers // Jun 2009

    Perceived Subjective Features of Software Components: Consumer Behavior in a Software Component Market

    Component-based software reuse has been generally regarded as a promising approach to improving software productivity and quality within software development. However, progress in component-based software reuse has been slower than expected. Much of the software reuse literature points to the lack of software components that can maximize users' benefits as...

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  • White Papers // Jun 2009

    Switchable Printed Yagi-Uda Antenna With Pattern Reconfiguration

    A switchable Yagi-Uda antenna prototype with radiation pattern reconfiguration is presented in this paper. The proposed reconfigurable antenna is based on the concept of switching between the reflector and director of a Yagi-Uda antenna using a radio frequency PIN diode. As a result, the minimum/maximum radiation can be steered towards...

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  • White Papers // Jun 2009

    Wideband Capon Beamforming for a Planar Phased Radar Array With Antenna Switching

    A wideband beamforming algorithm for estimating the azimuth angle, elevation angle, velocity, and range using a planar phased radar array with antenna switching is proposed. It uses the time-variant steering vector model. Simulation results illustrating the performance of the proposed beamformer are presented. Recently, there has been great interest in...

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  • White Papers // Jun 2009

    Microstrip Coupled-Line Lowpass Filter With Wide Stopband for RF/Wireless Systems

    The authors present the design of a compact microstrip lowpass filter with a wide stopband which is up to ten times the cutoff frequency. The filter is based on a coupled-line configuration and shunt open stubs. The open stubs create additional transmission zeros, which are used to extend the stopband...

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  • White Papers // Jun 2009

    One-to-All Broadcasting in Petersen-Torus Networks for SLA and MLA Models

    In a network, broadcasting is the dissemination of a message from the originating node holding the message to all the rest of nodes through a call, that is, successful data transmission between nodes. Broadcasting algorithms can be divided into two types: one-to-all broadcasting, in which a message is transmitted from...

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  • White Papers // Jun 2009

    One-to-All Broadcasting of Even Networks for One-Port and All-Port Models

    Broadcasting is one of the most important communication primitives used in multiprocessor networks. In this paper, the authors describe that the broadcasting algorithm proposed by Madabhushi and others is incorrect. They introduce efficient one-to-all broadcasting schemes of even networks for one-port and all-port models. The broadcasting time of the one-port...

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  • White Papers // Jun 2009

    Balancing MPEG Transcoding With Storage in Multiple-Quality Video-on-Demand Services

    To match the requirements of heterogeneous mobile devices, video objects may be transcoded, which requires considerable CPU resources. Alternatively, multiple versions of the same video may be stored on servers, but this requires a lot of disk space. The authors formulate the trade-off between the versions that are stored on...

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  • White Papers // Apr 2009

    Mapping and Scheduling for Circuit-Switched Network-on-Chip Architecture

    Network-on-Chip (NoC) architecture provides a high-performance communication infrastructure for system on-chip designs. Circuit-switched networks guarantee transmission latency and throughput; hence, they are suitable for NoC architecture with real-time traffic. In this paper, the authors propose an efficient integrated scheme which automatically maps application tasks onto NoC tiles, establishes communication circuits,...

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  • White Papers // Apr 2009

    Estimation-Based Load-Balancing With Admission Control for Cluster Web Servers

    The growth of the World Wide Web and web-based applications is creating demand for high performance web servers to offer better throughput and shorter user-perceived latency. This demand leads to widely used cluster-based web servers in the Internet infrastructure. Load balancing algorithms play an important role in boosting the performance...

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  • White Papers // Apr 2009

    Application of ANFIS Power Control for Downlink CDMA-Based LMDS Systems

    Rain attenuation and intercell interference are two crucial factors in the performance of broadband wireless access networks such as Local Multipoint Distribution Systems (LMDS) operating at frequencies above 20 GHz. Power control can enhance the performance of downlink CDMA-based LMDS systems by reducing intercell interference under clear sky conditions; however,...

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  • White Papers // Apr 2009

    Blind Adaptive Multiuser Detection for the MC-CDMA Systems Using Orthogonalized Subspace Tracking

    In this paper, the authors study the performance of subspace-based multiuser detection techniques for Multi-Carrier Code-Division Multiple Access (MC-CDMA) systems. They propose an improvement in the PASTd algorithm by cascading it with the classical Gram-Schmidt procedure to orthonormalize the eigenvectors after their sequential extraction. The tracking of signal subspace using...

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  • White Papers // Apr 2009

    InP-Based Polarization-Insensitive Planar Waveguide Concave Grating Demultiplexer With Flattened Spectral Response

    InP-based planar waveguide 48-channel concave grating demultiplexers with a channel spacing of 0.8 nm (100 GHz) are described and demonstrated. Polarization insensitivity and flattened spectral response are successfully achieved by the introduction of a polarization compensator and a two-focus grating, respectively. The fabricated device shows a polarization-dependent wavelength shift of...

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  • White Papers // Apr 2009

    Channel Enlargement of PON System Using Nonreciprocal Multiplexing Filter Based on CWDM

    The authors propose a nonreciprocal filter based on Coarse Wavelength Division Multiplexing (CWDM) that reduces the upstream channel insertion loss in a Passive Optical Network (PON). They also propose a method to increase the number of channels/Optical Network Units (ONUs) in PON systems using the proposed filter to reduce the...

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  • White Papers // Feb 2009

    Strategic Differentiation of Internationalization in the Mobile Telecommunications Industry: Case Studies

    The authors present a unified explanation of the internationalization strategies of major Mobile Network Operators (MNOs). They have developed a framework that analyzes the strategies of major international MNOs in terms of the relationship between their degree of involvement in international business operations and the degree of equity participation. The...

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  • White Papers // Feb 2009

    OFDMA-Based Reliable Multicast MAC Protocol for Wireless Ad-Hoc Networks

    Compared with unicast, multicast over wireless ad-hoc networks do not support reliability due to their inability to exchange Request-To-Send/Clear-To-Send (RTS/CTS) and ACK packets with multiple recipients. Although several Media Access Control (MAC) layer protocols have been proposed to provide reliable multicast, these introduce additional overhead, which degrades system performance. A...

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  • White Papers // Feb 2009

    Optimal Buffer Allocation in Tandem Queues With Communication Blocking

    In this paper, the authors consider an m-node tandem queue (queues in series) with a Poisson arrival process and either deterministic or non-overlapping service times. With the assumption that each node has a finite buffer except for the first node, they show the non-increasing convex property of stationary waiting time...

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  • White Papers // Feb 2009

    Competitive Resource Sharing Based on Game Theory in Cooperative Relay Networks

    This paper considers the problem of resource sharing among a relay and multiple user nodes in cooperative transmission networks. The authors formulate this problem as a sellers' market competition and use a non-cooperative game to jointly consider the benefits of the relay and the users. They also develop a distributed...

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  • White Papers // Feb 2009

    Bidirectional Artificial Neural Networks for Mobile-Phone Fraud Detection

    The authors propose a system for mobile-phone fraud detection based on a bidirectional Artificial Neural Network (bi-ANN). The key advantage of such a system is the ability to detect fraud not only by offline processing of Call Detail Records (CDR), but also in real time. The core of the system...

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  • White Papers // Dec 2008

    Design Evaluation System With Visualization and Interaction of Mobile Devices Based on Virtual Reality Prototypes

    In this paper, the authors present a design evaluation system with visualization and interaction of mobile devices using virtual-reality-based prototypes which can be used to easily change design parameters and simulate embedded software. To evaluate and predict affective-engineering based design preferences for mobile devices under a virtual environment, they have...

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  • White Papers // Oct 2009

    Dictionary Attack on Functional Transform-Based Cancelable Fingerprint Templates

    Recently, Ratha and others proposed a cancelable biometrics scheme which transforms an original fingerprint template into a new one using a noninvertible transformation. However, the authors show that the original template is recovered by a dictionary attack if two transformed templates originating from it are revealed. In their attack, they...

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  • White Papers // Oct 2009

    An Ethernet Ring Protection Method to Minimize Transient Traffic by Selective FDB Advertisement

    The authors introduce an improved Ethernet ring protection method, selective Filtering DataBase (FDB) advertisement, to minimize traffic overshoot in the event of a failure or recovery. On the protection switching event, the proposed method makes all ring nodes perform an FDB flush except the FDB entries associated with their client...

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  • White Papers // Aug 2009

    Novel Equalization On-Channel Repeater With Feedback Interference Canceller in Terrestrial Digital Multimedia Broadcasting System

    In this paper, the authors propose a novel equalization On-Channel Repeater (OCR) with a feedback interference canceller (FIC) to relay terrestrial digital multimedia broadcasting signals in single frequency networks. The proposed OCR not only has high output power by cancelling the feedback signals caused by insufficient antenna isolation through the...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Aug 2009

    Design and Development of T-DMB Multichannel Audio Service System Based on Spatial Audio Coding

    In this paper, a Terrestrial Digital Multimedia Broadcasting (T-DMB) multichannel audio broadcasting system based on spatial audio coding is presented. The proposed system provides realistic multichannel audio service via T-DMB with a small increase of data rate as well as backward compatibility with the conventional stereo-based T-DMB player. To reduce...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Aug 2009

    Design and Performance Analysis of Emulator for Standard Conformance Test of Active RFID

    An active Radio Frequency IDentification (RFID) system has the advantages of a long identification distance and a good identification rate, overcoming passive RFID drawbacks. Therefore, interest in the development of active RFID systems has been gradually increasing in areas of harbor logistics and national defense. However, some identification failures between...

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  • White Papers // Aug 2009

    Security Flaws in Authentication Protocols With Anonymity for Wireless Environments

    The emerging wireless networks require the design of new authentication protocols due to their dynamic nature and vulnerable-to-attack structure. Recently, Wu and others proposed a wireless authentication protocol which is claimed to be an improvement of the authentication protocol proposed by Lee and others which provides user anonymity. In this...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Aug 2009

    Wirelessly Synchronized One-Way Ranging Algorithm With Active Mobile Nodes

    In this paper, the authors propose a one-way ranging algorithm that is based on wireless synchronization with measured timestamps and clock frequency offsets. In their proposed algorithm, an active mobile node initiates a ranging procedure by transmitting a ranging frame, and the anchor nodes report their timestamps for the received...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Aug 2009

    A Weighted Scheduling Mechanism to Reduce Multicast Packet Loss in IPTV Service Over EPON

    In this paper, an Ordered Successive Interference Cancellation (OSIC) scheme is applied for Multiple-Input Multiple-Output (MIMO) detection in Ultra-WideBand (UWB) communication systems. The error rate expression of an OSIC receiver on a log-normal multipath fading channel is theoretically derived in a closed form solution. Its bit error rate performance is...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Aug 2009

    Design of Balanced Dual-Band Bandpass Filter With Self-Feedback Structure

    The rapid development of wireless communication is creating extraordinary demand for dual-band Radio Frequency (RF) front-end solutions. Various dual-band filters have recently been proposed. The transmission zeros are introduced in the middle of a wide bandpass filter to enforce the emergence of two separate passbands. Also, some dualband filters and...

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  • White Papers // Jun 2009

    Soft Combination Schemes for Cooperative Spectrum Sensing in Cognitive Radio Networks

    This paper investigates linear soft combination schemes for cooperative spectrum sensing in cognitive radio networks. The authors propose two weight-setting strategies under different basic optimality criteria to improve the overall sensing performance in the network. The corresponding optimal weights are derived, which are determined by the noise power levels and...

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  • White Papers // Dec 2008

    Simulation Models for Investigation of Multiuser Scheduling in MIMO Broadcast Channels

    Spatial correlation is a result of insufficient antenna spacing among multiple antenna elements, while temporal correlation is caused by Doppler spread. This paper compares the effect of spatial and temporal correlation in order to investigate the performance of multiuser scheduling algorithms in Multiple-Input Multiple-Output (MIMO) broadcast channels. This comparison includes...

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  • White Papers // Dec 2008

    Orbit Determination Accuracy Improvement for Geostationary Satellite With Single Station Antenna Tracking Data

    An operational Orbit Determination (OD) and prediction system for the geostationary Communication, Ocean, and Meteorological Satellite (COMS) mission requires accurate satellite positioning knowledge to accomplish image navigation registration on the ground. Ranging and tracking data from a single ground station is used for COMS OD in normal operation. However, the...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Dec 2008

    Efficient LDPC-Based, Threaded Layered Space-Time-Frequency System With Iterative Receiver

    The authors present a Low-Density Parity-Check (LDPC)-based, threaded layered space-time-frequency system with emphasis on the iterative receiver design. First, the Unbiased Minimum Mean-Squared-Error Iterative-Tree-Search (U-MMSE-ITS) detector, which is known to be one of the most efficient Multi-Input Multi-Output (MIMO) detectors available, is improved by augmentation of the partial-length paths and...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Dec 2008

    High Security FeRAM-Based EPC C1G2 UHF (860 MHz-960 MHz) Passive RFID Tag Chip

    The Metal-Ferroelectric-Metal (MFM) capacitor in the Ferroelectric Random Access Memory (FeRAM) embedded RFID chip is used in both the memory cell region and the peripheral analog and digital circuit area for capacitance parameter control. The capacitance value of the MFM capacitor is about 30 times larger than that of conventional...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Dec 2008

    A Two-Stage Radix-4 Viterbi Decoder for Multiband OFDM UWB Systems

    This paper presents a power efficient 64-state Viterbi Decoder (VD) employing a two-stage radix-4 add compare-select architecture. A class of VD architectures is implemented, and their hardware complexity, maximum operating speed, and power consumption are compared. Implementation results show that the proposed VD architecture is suitable for Multi-Band Orthogonal Frequency-Division...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Dec 2008

    Semijoin-Based Spatial Join Processing in Multiple Sensor Networks

    This paper presents an energy-efficient spatial join algorithm for multiple sensor networks employing a spatial semijoin strategy. For optimization of the algorithm, the authors propose a GR-tree index and a grid-ID-based spatial approximation method, which are unique to sensor networks. The GR-tree is a distributed spatial index over the sensor...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Dec 2008

    One-to-All Broadcasting of Odd Networks for One-Port and All-Port Models

    Odd networks were introduced in the context of graph theory. However, their potential as fault-tolerant multiprocessor networks has been shown. Broadcasting is one of the most important communication primitives used in multiprocessor networks. In this paper, the authors introduce efficient one-to-all broadcasting schemes of odd networks for one-port and all-port...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Dec 2008

    Effective Multiplexing Method for Conditional Access System in Terrestrial DMB

    This paper proposes a Conditional Access System (CAS) suitable for use in Terrestrial Digital Multimedia Broadcasting (T-DMB), based on an effective multiplexing method to provide encrypted T-DMB services. Specifically, the proposed multiplexing method for a CAS is designed to reduce the additional bit rate while assuring easy access to the...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Dec 2008

    Model Adaptation Using Discriminative Noise Adaptive Training Approach for New Environments

    A conventional environment adaptation for robust speech recognition is usually conducted using transform-based techniques. Here, the authors present a discriminative adaptation strategy based on a multi-condition-trained model, and propose a new method to provide universal application to a new environment using the environment's specific conditions. Experimental results show that a...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Dec 2008

    Mitigating the ICA Attack Against Rotation-Based Transformation for Privacy Preserving Clustering

    The Rotation-Based Transformation (RBT) for privacy preserving data mining is vulnerable to the Independent Component Analysis (ICA) attack. This paper introduces a modified multiple-rotation-based transformation technique for special mining applications, mitigating the ICA attack while maintaining the advantages of the RBT. While it is important for data owners to publish...

    Provided By Electronics and Telecommunication Research Institute