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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Electronics and Telecommunications Research Institute
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Volume & Issues
Volume 31, Issue 6 - Dec 2009
Volume 31, Issue 5 - Oct 2009
Volume 31, Issue 4 - Aug 2009
Volume 31, Issue 3 - Jun 2009
Volume 31, Issue 2 - Apr 2009
Volume 31, Issue 1 - Feb 2009
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Ku-Band Power Amplifier MMIC Chipset with On-Chip Active Gate Bias Circuit
Noh, Youn-Sub ; Chang, Dong-Pil ; Yom, In-Bok ;
ETRI Journal, volume 31, issue 3, 2009, Pages 247~253
We propose a Ku-band driver and high-power amplifier monolithic microwave integrated circuits (MMICs) employing a compensating gate bias circuit using a commercial 0.5
GaAs pHEMT technology. The integrated gate bias circuit provides compensation for the threshold voltage and temperature variations as well as independence of the supply voltage variations. A fabricated two-stage Ku-band driver amplifier MMIC exhibits a typical output power of 30.5 dBm and power-added efficiency (PAE) of 37% over a 13.5 GHz to 15.0 GHz frequency band, while a fabricated three-stage Ku-band high-power amplifier MMIC exhibits a maximum saturated output power of 39.25 dBm (8.4 W) and PAE of 22.7% at 14.5 GHz.
Compact Multi-harmonic Suppression LTCC Bandpass Filter Using Parallel Short-Ended Coupled-Line Structure
Wang, Xu-Guang ; Yun, Young ; Kang, In-Ho ;
ETRI Journal, volume 31, issue 3, 2009, Pages 254~262
DOI : 10.4218/etrij.09.0108.0379
This paper presents a novel simple filter design method based on a parallel short-ended coupled-line structure with capacitive loading for size reduction and ultra-broad rejection of spurious passbands. In addition, the introduction of a cross-coupling capacitor into the miniaturized coupled-line can create a transmission zero at the second harmonic frequency for better frequency selectivity and attenuation level. The aperture compensation technique is also applied to achieve a strong coupling in the coupled-line section. The influence of using the connecting transmission line to cascade two identical one-stage filters is studied for the first time. Specifically, such a two-stage bandpass filter operating at 2.3 GHz with a fractional bandwidth of 10% was designed and realized with low-temperature co-fired ceramic technology for application in base stations that need high power handling capability. It achieved attenuation in excess of -40 dB up to
and low insertion loss of -1.2 dB with the size of 10 mm
2.2 mm. The measured and simulated results showed good agreement.
Soft Combination Schemes for Cooperative Spectrum Sensing in Cognitive Radio Networks
Shen, Bin ; Kwak, Kyung-Sup ;
ETRI Journal, volume 31, issue 3, 2009, Pages 263~270
This paper investigates linear soft combination schemes for cooperative spectrum sensing in cognitive radio networks. We 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 the received primary user signal energies of multiple cooperative secondary users in the network. However, to obtain the instantaneous measurement of these noise power levels and primary user signal energies with high accuracy is extremely challenging. It can even be infeasible in practical implementations under a low signal-to-noise ratio regime. We therefore propose reference data matrices to scavenge the indispensable information of primary user signal energies and noise power levels for setting the proposed combining weights adaptively by keeping records of the most recent spectrum observations. Analyses and simulation results demonstrate that the proposed linear soft combination schemes outperform the conventional maximal ratio combination and equal gain combination schemes and yield significant performance improvements in spectrum sensing.
Multiband Microstrip-Fed Right Angle Slot Antenna Design for Wireless Communication Systems
Rakluea, Paitoon ; Anantrasirichai, Noppin ; Janchitrapongvej, Kanok ; Wakabayashi, Toshio ;
ETRI Journal, volume 31, issue 3, 2009, Pages 271~281
This paper presents a novel multiband microstrip-fed right angle slot antenna design technique for multiple independent frequency bands. The new technique uses various slot sizes at various appropriate positions. We first propose a tri-band slot antenna consisting of three right angle slots. Then, a quad-band slot antenna is developed with four right angle slots which achieves slant
linear polarization, omnidirectional pattern coverage, good antenna gain, and acceptable impedance bandwidths over all the operating frequency range. Moreover, an open-circuited tuning stub is introduced to achieve good impedance matching. Both proposed antennas are designed on a ground plane of RT/duroid 5880 substrate with a thickness of 1.575 mm. The real measurable results show that the desired frequencies used in wireless communication systems, namely, WLAN and WiMax, are efficiently achieved.
Mean-Shift Object Tracking with Discrete and Real AdaBoost Techniques
Baskoro, Hendro ; Kim, Jun-Seong ; Kim, Chang-Su ;
ETRI Journal, volume 31, issue 3, 2009, Pages 282~291
An online mean-shift object tracking algorithm, which consists of a learning stage and an estimation stage, is proposed in this work. The learning stage selects the features for tracking, and the estimation stage composes a likelihood image and applies the mean shift algorithm to it to track an object. The tracking performance depends on the quality of the likelihood image. We propose two schemes to generate and integrate likelihood images: one based on the discrete AdaBoost (DAB) and the other based on the real AdaBoost (RAB). The DAB scheme uses tuned feature values, whereas RAB estimates class probabilities, to select the features and generate the likelihood images. Experiment results show that the proposed algorithm provides more accurate and reliable tracking results than the conventional mean shift tracking algorithms.
Butterworth Window for Power Spectral Density Estimation
Yoon, Tae-Hyun ; Joo, Eon-Kyeong ;
ETRI Journal, volume 31, issue 3, 2009, Pages 292~297
The power spectral density of a signal can be estimated most accurately by using a window with a narrow bandwidth and large sidelobe attenuation. Conventional windows generally control these characteristics by only one parameter, so there is a trade-off problem: if the bandwidth is reduced, the sidelobe attenuation is also reduced. To overcome this problem, we propose using a Butterworth window with two control parameters for power spectral density estimation and analyze its characteristics. Simulation results demonstrate that the sidelobe attenuation and the 3 dB bandwidth can be controlled independently. Thus, the trade-off problem between resolution and spectral leakage in the estimated power spectral density can be overcome.
Improved Modification of the Closed-Loop-Controlled AC-AC Resonant Converter for Induction Heating
Dhandapani, Kirubakaran ; Sathi, Rama Reddy ;
ETRI Journal, volume 31, issue 3, 2009, Pages 298~303
A single-switch parallel resonant converter for induction heating is implemented. The circuit consists of an input LC-filter, a bridge rectifier, and a controlled power switch. The switch operates in soft commutation mode and serves as a high frequency generator. The output power is controlled via the switching frequency. A steady state analysis of the converter operation is presented. A closed-loop circuit model is also presented, and the experimental results are compared with the simulation results.
Perceived Subjective Features of Software Components: Consumer Behavior in a Software Component Market
Lee, Jang-Hyuk ; Hong, Se-Joon ; Sawng, Yeong-Wha ; Kim, Ju-Seong ;
ETRI Journal, volume 31, issue 3, 2009, Pages 304~314
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 the most important source of the slow progress. Considering that the underlying processes behind component-based software reuse are strikingly similar to commercial software marketing, this paper attempts to identify the aspects of software components that consumers value and to establish relationships between the identified aspects and consumer behavior in the software component market. More specifically, this paper focuses on the perceived subjective features of software components. This study was conducted in a web-based artificial market environment called "SofTrade."
Aperture-Miniaturized Antenna Loaded with Split Ring Resonator Array
Oh, Soon-Soo ; Park, Wook-Ki ; Kang, Suk-Youb ; Park, Hyo-Dal ;
ETRI Journal, volume 31, issue 3, 2009, Pages 315~317
In this letter, a novel antenna with a miniaturized aperture is proposed. The substrate including a split-ring resonator array is inserted into a size-reduced open-ended waveguide. For a low return loss and high radiation efficiency, the ring arrangement is optimized, and a stepped transition using H-plane discontinuity is proposed. The proposed antenna achieves a 70% aperture reduction compared to a conventional standard waveguide antenna of WR-187 (47.6 mm
22.2 mm). The return loss drops significantly at three frequencies, and a reasonable gain is achieved. The aperture-miniaturized antenna can be used in many antenna applications such as near-field measurement.
Switchable Printed Yagi-Uda Antenna with Pattern Reconfiguration
Baik, Jung-Woo ; Pyo, Seong-Min ; Lee, Tae-Hak ; Kim, Young-Sik ;
ETRI Journal, volume 31, issue 3, 2009, Pages 318~320
A switchable Yagi-Uda antenna prototype with radiation pattern reconfiguration is presented in this letter. 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 desired signals or away from interfering signals in opposite directions. The measured 10 dB impedance bandwidth and gain are 210 MHz (7%) and 8.02 dBi at 3 GHz, respectively. Details of the antenna design and its performance are described and empirically analyzed.
Wideband Capon Beamforming for a Planar Phased Radar Array with Antenna Switching
Lee, Moon-Sik ;
ETRI Journal, volume 31, issue 3, 2009, Pages 321~323
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.
Microstrip Coupled-Line Lowpass Filter with Wide Stopband for RF/Wireless Systems
Velidi, Vamsi Krishna ; Mandal, Mrinal Kanti ; Sanyal, Subrata ;
ETRI Journal, volume 31, issue 3, 2009, Pages 324~326
We 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 of the filter without any additional components or cascaded units. A prototype lowpass filter with a 3 dB cutoff frequency of 0.428 GHz and a 15 dB stopband extended up to 4.77 GHz is fabricated to validate the theoretical predictions.
One-to-All Broadcasting in Petersen-Torus Networks for SLA and MLA Models
Seo, Jung-Hyun ; Lee, Hyeong-Ok ;
ETRI Journal, volume 31, issue 3, 2009, Pages 327~329
In a network, broadcasting is the dissemination of a message from a source node holding a message to all the remaining nodes through a call. This letter proposes a one-to-all broadcasting algorithm in the Petersen-torus network PT(n, n) for the single-link-available and multiple-link-available models. A PT(n, n) is a regular network whose degree is 4 and number of nodes is
, where the Petersen graph is set as a basic module, and the basic module is connected in the form of a torus. A broadcasting algorithm is developed using a divide-and-conquer technique, and the time complexity of the proposed algorithm approximates n+4, the diameter of PT(n, n), which is the lower bound of the time complexity of broadcasting.
One-to-All Broadcasting of Even Networks for One-Port and All-Port Models
Kim, Jong-Seok ; Lee, Hyeong-Ok ; Kim, Sung-Won ;
ETRI Journal, volume 31, issue 3, 2009, Pages 330~332
Broadcasting is one of the most important communication primitives used in multiprocessor networks. In this letter, we demonstrate that the broadcasting algorithm proposed by Madabhushi and others is incorrect. We introduce efficient one-to-all broadcasting schemes of even networks for one-port and all-port models. The broadcasting time of the one-port model is 2d-3 and that of the all-port model is d-1. The total time steps taken by the proposed algorithms are optimal.
Balancing MPEG Transcoding with Storage in Multiple-Quality Video-on-Demand Services
Song, Min-Seok ; Sim, Jeong-Seop ; Go, Jae-Doo ; Lee, Bum-Sun ; Park, Soo-Jun ;
ETRI Journal, volume 31, issue 3, 2009, Pages 333~335
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. We formulate the trade-off between the versions that are stored on disk and the need for transcoding. We propose an optimal solution to this formulation based on dynamic programming. Experiments show that our scheme allows up to 68% more clients to be admitted than conventional schemes when a reasonable amount of storage is available.
Complexity Reduction Method for BSAC Decoder
Jeong, Gyu-Hyeok ; Ahn, Yeong-Uk ; Lee, In-Sung ;
ETRI Journal, volume 31, issue 3, 2009, Pages 336~338
This letter proposes a complexity reduction method to speed up the noiseless decoding of a bit-sliced arithmetic coding (BSAC) decoder. This scheme fully utilizes the group of consecutive arithmetic-coded symbols known as the decoding band and the significance tree structure sorted in order of significance at every decoding band. With the same audio quality, the proposed method reduces the number of calculations that are performed during the noiseless decoding in BSAC to about 22% of the amount of calculations with the conventional full-search method.
A Novel BIRA Method with High Repair Efficiency and Small Hardware Overhead
Yang, Myung-Hoon ; Cho, Hyung-Jun ; Jeong, Woo-Sik ; Kang, Sung-Ho ;
ETRI Journal, volume 31, issue 3, 2009, Pages 339~341
Built-in redundancy analysis (BIRA) is widely used to enhance the yield of embedded memories. In this letter, a new BIRA method for both high repair efficiency and small hardware overhead is presented. The proposed method performs redundancy analysis operations using the spare mapping registers with a covered fault list. Experimental results demonstrate the superiority of the proposed method compared to previous works.
Epitaxial Layer Design for High Performance GaAs pHEMT SPDT MMIC Switches
Oh, Jung-Hun ; Mun, Jae-Kyoung ; Rhee, Jin-Koo ; Kim, Sam-Dong ;
ETRI Journal, volume 31, issue 3, 2009, Pages 342~344
From a hydrodynamic device simulation for the pseudomorphic high electron mobility transistors (pHEMTs), we observe an increase of maximum extrinsic transconductance and a decrease of source-drain capacitances. This gives rise to an enhancement of the switching speed and isolation characteristics as the upper-to-lower planar-doping ratios (UTLPDR) increase. On the basis of simulation results, we fabricate single-pole-double-throw transmitter/receiver monolithic microwave integrated circuit (MMIC) switches with the pHEMTs of two different UTLPDRs (4:1 and 1:2). The MMIC switch with a 4:1 UTLPDR shows about 2.9 dB higher isolation and approximately 2.5 times faster switching speed than those with a 1:2 UTLPDR.
Noncentral F-Distribution for an M-ary Phase Shift Keying Wedge-Shaped Region
Kim, Jung-Su ; Chong, Jong-Wha ;
ETRI Journal, volume 31, issue 3, 2009, Pages 345~347
This letter presents an alternative analytical expression for computing the probability of an M-ary phase shift keying (MPSK) wedge-shaped region in an additive white Gaussian noise channel. The expression is represented by the cumulative distribution function of known noncentral F-distribution. Computer simulation results demonstrate the validity of our analytical expression for the exact computation of the symbol error probability of an MPSK system with phase error.
Improved Coded Mark Inversion for the Passive Radio Frequency Transmission System of the Electronic Time Fuze
Xiong, Dong ; Zeng, Xiaoping ; Zhao, Xiaogang ;
ETRI Journal, volume 31, issue 3, 2009, Pages 348~350
To fit the limited volume and power consumption of the passive radio frequency transmission system of the electronic time fuze, an improved coded mark inversion (CMI) is proposed in this letter. From the performance analysis, the energy transmission efficiency of this encoding method is at least 50% higher than that of CMI and NRZ. Finally, the experiment results show that by adopting this improved CMI, the change of DC voltage through magnetic coupling is lower than 0.2 V when the accuracy of data transmission is above 99.5%.