Electronics and Telecommunication Research Institute

Displaying 1-40 of 106 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...

    Provided By Electronics and Telecommunication Research Institute

  • 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...

    Provided By Electronics and Telecommunication Research Institute

  • 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....

    Provided By Electronics and Telecommunication Research Institute

  • 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...

    Provided By Electronics and Telecommunication Research Institute

  • 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....

    Provided By Electronics and Telecommunication Research Institute

  • 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...

    Provided By Electronics and Telecommunication Research Institute

  • 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...

    Provided By Electronics and Telecommunication Research Institute

  • 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...

    Provided By Electronics and Telecommunication Research Institute

  • 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...

    Provided By Electronics and Telecommunication Research Institute

  • 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...

    Provided By Electronics and Telecommunication Research Institute

  • 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...

    Provided By Electronics and Telecommunication Research Institute

  • 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...

    Provided By Electronics and Telecommunication Research Institute

  • 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...

    Provided By Electronics and Telecommunication Research Institute

  • 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...

    Provided By Electronics and Telecommunication Research Institute

  • 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....

    Provided By Electronics and Telecommunication Research Institute

  • 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...

    Provided By Electronics and Telecommunication Research Institute

  • 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...

    Provided By Electronics and Telecommunication Research Institute

  • 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,...

    Provided By Electronics and Telecommunication Research Institute

  • 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...

    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...

    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

    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...

    Provided By Electronics and Telecommunication Research Institute

  • 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...

    Provided By Electronics and Telecommunication Research Institute

  • 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...

    Provided By Electronics and Telecommunication Research Institute

  • 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,...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Jun 2010

    Random Point Blinding Methods for Koblitz Curve Cryptosystem

    While the Elliptic Curve Cryptosystem (ECC) is getting more popular in securing numerous systems, implementations without consideration for side-channel attacks are susceptible to critical information leakage. This paper proposes new power attack countermeasures for ECC over Koblitz curves. Based on some special properties of Koblitz curves, the proposed methods randomize...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Jun 2010

    Temperature-Adaptive Back-Bias Voltage Generator for an RCAT Pseudo SRAM

    In order to guarantee the proper operation of a Recessed Channel Array Transistor (RCAT) pseudo SRAM, the back-bias voltage must be changed in response to changes in temperature. Due to cell drivability and leakage current, the obtainable back-bias range also changes with temperature. This paper presents a pseudo SRAM for...

    Provided By Electronics and Telecommunication Research Institute

  • 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...

    Provided By Electronics and Telecommunication Research Institute

  • 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...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Apr 2010

    Flush Optimizations to Guarantee Less Transient Traffic in Ethernet Ring Protection

    Ethernet Ring Protection (ERP) technology, which is defined in ITU-T Recommendation G.8032, has been developed to provide carrier grade recovery for Ethernet ring networks. However, the Filtering DataBase (FDB) flush method adopted in the current ERP standard has the drawback of introducing a large amount of transient traffic overshoot caused...

    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...

    Provided By Electronics and Telecommunication Research Institute

  • 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...

    Provided By Electronics and Telecommunication Research Institute

  • 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...

    Provided By Electronics and Telecommunication Research Institute

  • 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...

    Provided By Electronics and Telecommunication Research Institute

  • 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...

    Provided By Electronics and Telecommunication Research Institute

  • 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...

    Provided By Electronics and Telecommunication Research Institute

  • 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...

    Provided By Electronics and Telecommunication Research Institute

  • 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...

    Provided By Electronics and Telecommunication Research Institute

  • 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...

    Provided By Electronics and Telecommunication Research Institute

  • 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...

    Provided By Electronics and Telecommunication Research Institute

  • 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,...

    Provided By Electronics and Telecommunication Research Institute

  • 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...

    Provided By Electronics and Telecommunication Research Institute

  • 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,...

    Provided By Electronics and Telecommunication Research Institute

  • 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...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Apr 2010

    Performance Analysis of Dynamic Spectrum Allocation in Heterogeneous Wireless Networks

    Increasing convergence among heterogeneous radio networks is expected to be a key feature of future ubiquitous services. The convergence of radio networks in combination with Dynamic Spectrum Allocation (DSA) could be a beneficial means to solve the growing demand for radio spectrum. DSA might enhance the spectrum utilization of involved...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Apr 2010

    Analysis of Consumers' Choices and Time-Consumption Behaviors for Various Broadcasting and Telecommunication Convergence Services

    In this paper, the authors analyzed consumers' choices of various broadcasting and telecommunication convergence services and time consumption for chosen services by using survey data. A multivariate probit model was used to model consumers' choices of various broadcasting and telecommunication convergence services, and an ordered probit model was used to...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Apr 2010

    Polarization-Diversity Cross-Shaped Patch Antenna for Satellite-DMB Systems

    A small reconfigurable patch antenna is proposed to achieve polarization diversity for digital multimedia broadcasting systems at 2.6 GHz. To obtain polarization diversity, a pair of on-slit PIN diodes is inserted in each diagonal of a cross-shaped patch. Thus, four PIN-diodes on these slits are utilized to change the connection...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Apr 2010

    High System Performance With Plasmonic Waveguides and Functional Devices

    The application of photonics in computing and information processing has been discussed over the past several decades. Impacted current computing systems consist of intra- and inter-chip interconnections that rely upon the flow of photons, thereby solving the communication problem between logic devices. In addition, photonics can also reduce the total...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Apr 2010

    Ultra-small Form-Factor Helix on Pad-Type Stage-Bypass WCDMA Tx Power Amplifier Using a Chip-Stacking Technique and a Multilayer Substrate

    A fully integrated small form-factor HBT Power Amplifier (PA) was developed for UMTS Tx applications. For practical use, the PA was implemented with a well configured bottom dimension, and a CMOS control IC was added to enable/disable the HBT PA. By using helix-on-pad integrated passive device output matching, a chip-stacking...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Apr 2010

    A New Architecture of Matched Filter for Chirp Spread Spectrum in IEEE 802.15.4a

    The authors propose a new matched filter architecture for chirp spread spectrum in IEEE 802.15.4a. By using relations among the four subchirps, the proposed architecture comprises four subfilters utilizing only a set of coefficients matched to the first subchirp. The four subfilters share adders and registers, and as a result,...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Apr 2010

    Rayleigh-Quotient and Iterative-Threshold-Test-Based Blind TOA Estimation for IR-UWB Systems

    This paper proposes a non-coherent blind Time-Of-Arrival (TOA) estimation scheme for impulse radio ultra-wideband systems. The TOA estimation is performed in two consecutive phases: the Rayleigh-quotient theorem-based Coarse-Signal Acquisition (CSA) and the iterative-threshold-test-based Fine Time Estimation (FTE). The proposed scheme serves in a blind manner without demanding any a priori...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Feb 2010

    A Low-Complexity 128-Point Mixed-Radix FFT Processor for MB-OFDM UWB Systems

    Ultra-WideBand (UWB) systems supporting various data rates from tens of Mb/s to hundreds of Mb/s are very suitable for application to short range wireless communications because they can share the frequency band with existing narrowband systems. One of the candidate schemes for the high-speed UWB PHYsical layer (PHY) is a...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Feb 2010

    Novel UWB Transceiver for WBAN Networks: A Study on AWGN Channels

    A novel Ultra-WideBand (UWB) transceiver structure is presented to be used in Wireless Body Area Networks (WBANs). In the proposed structure, a data channel and a control channel are combined into a single transmission signal. In the signal, a modulation method mixing pulse position modulation and pulse amplitude modulation is...

    Provided By Electronics and Telecommunication Research Institute

  • White Papers // Feb 2010

    Game Traffic Classification Using Statistical Characteristics at the Transport Layer

    The pervasive game environments have activated explosive growth of the Internet over recent decades. Thus, understanding Internet traffic characteristics and precise classification have become important issues in network management, resource provisioning, and game application development. Naturally, much attention has been given to analyzing and modeling game traffic. Little research, however,...

    Provided By Electronics and Telecommunication Research Institute