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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of information and communication convergence engineering
Journal Basic Information
Journal DOI :
The Korean Institute of Information and Commucation Engineering
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Volume & Issues
Volume 4, Issue 4 - Dec 2006
Volume 4, Issue 3 - Sep 2006
Volume 4, Issue 2 - Jun 2006
Volume 4, Issue 1 - Mar 2006
Selecting the target year
The Solution of Insufficiency of Radio Frequency Spectrum in Republic of Kazakhstan
Abishev Olzhas ; Jo Dong-Kwan ; Chung Joong-Soo ;
Journal of information and communication convergence engineering, volume 4, issue 2, 2006, Pages 53~57
The objective of this paper is to propose a system by means of which the utilization of radio frequency. spectrum may be improved from the state of extreme inefficiency at the present time in Kazakhstan to a state of efficiency and equilibrium in the future.
Design of MTLMS Based Decision Feedback Equalizer
Choi Yun-Seok ; Park Hyung-Kun ;
Journal of information and communication convergence engineering, volume 4, issue 2, 2006, Pages 58~61
A key issue toward mobile multimedia communications is to create technologies for broadband signal transmission that can support high quality services. Such a broadband mobile communications system should be able to overcome severe distortion caused by timevarying multi-path fading channel, while providing high spectral efficiency and low power consumption. For these reasons, an adaptive suboptimum decision feedback equalizer (DFE) for the single-carrier shortburst transmissions system is considered as one of the feasible solutions. For the performance improvement of the system with the short-burst format including the short training sequence, in this paper, the multiple-training least mean square (MTLMS) based DFE scheme with soft decision feedback is proposed and its performance is investigated in mobile wireless channels throughout computer simulation.
A Study on Application Boundary of Wireless LAN's Communication for Space Variation
Cha Jin-Man ; Kang Min-Soo ; Park Yeoun-Sik ;
Journal of information and communication convergence engineering, volume 4, issue 2, 2006, Pages 62~66
The objective of this thesis is to measure the limit of the real space where wireless Local Area Network (LAN) is used, and to apply this result as reference to set up a real Wireless LAN environment. The organized circumference was composed of Wireless LAN based on IEEE 802.11b of the American standard, and the examination is carried out on the campus. On the real condition of office environment and open space, the ratio of available distance to a signal at each distance was measured and this result was studied as data to embody wireless LAN on the campus. The measurement under an indoor environment was executed under circumstance having two walls and open space, however, was executed respectively under three circumstances: Where no obstacle, where one wall exists, and where two or more walls exist.
Remote Vital Signal Monitoring System Based on Wireless Sensor Network Using Ad-Hoc Routing
Walia Gaurav ; Lee Young-Dong ; Chung Wan-Young ;
Journal of information and communication convergence engineering, volume 4, issue 2, 2006, Pages 67~70
A distributed healthcare monitoring system prototype for clinical and trauma patients was developed, using wireless sensor network node. The proposed system aimed to measure various vital physiological health parameters like ECG and body temperature of patients and elderly persons, and transfer his/her health status wirelessly in Ad-hoc network to remote base station which was connected to doctor's PDA/PC or to a hospital's main Server using wireless sensor node. The system also aims to save the cost of healthcare facility for patients and the operating power of the system because sensor network is deployed widely and the distance from sensor to base station was shorter than in general centralized system. The wireless data communication will follow IEEE 802.15.4 frequency communication with ad-hoc routing thus enabling every motes attached to patients, to form a wireless data network to send data to base-station, providing mobility and convenience to the users in home environment.
A Study on CSMA/CA for IEEE 802.11 WLAN Environment
Moon Il-Young ; Cho Sung-Joon ;
Journal of information and communication convergence engineering, volume 4, issue 2, 2006, Pages 71~74
A basic access method about IEEE 802.11 MAC layer protocol using IEEE 802.11 wireless LANs is the DCF thatis based on the CSMA/CA. But, cause of IEEE 802.11 MAC layer uses original backoff algorithm (exponential backoff method), when collision occurred, the size of contention windows increases the double size Also, a time of packet transmission delay increases and efficienty is decreased by original backoff scheme. In this paper, we have analyzed TCP packet transmission time of IEEE 802.11 MAC DCF protocol for wireless LANs a proposed enhanced backoff algorithm. It is considered the transmission time of transmission control protocol (TCP) packet on the orthogonal frequency division multiplexing (OFDM) in additive white gaussian noise (A WGN) and Rician fading channel. From the results, a proposed enhanced backoff algorithm produces a better performance improvement than an original backoff in wireless LAN environment. Also, in OFDM/quadrature phase shift keying channel (QPSK), we can achieve that the transmission time in wireless channel decreases as the TCP packet size increases and based on the data collected, we can infer the correlation between packet size and the transmission time, allowing for an inference of the optimal packet size in the TCP layer.
Low-Complexity Maximum-Likelihood Decoder for VBLAST-STBC Scheme Using Non-square OSTBC Code Rate 3/4
Pham Van-Su ; Le Minh-Tuan ; Mai Linh ; Yoon Gi-Wan ;
Journal of information and communication convergence engineering, volume 4, issue 2, 2006, Pages 75~78
This work presents a low complexity maximum-likelihood decoder for signal detection in VBLAST-STBC system, which employs non-square O-STBC code rate 3/4. Stacking received symbols from different symbol duration and applying QR decomposition result in the special format of upper triangular matrix R so that the proposed decoder is able to provide not only ML-like BER performance but also very low computational load. The low computational load and ML-like BER performance properties of the proposed decoder are verified by computer simulations.
Reduced Complexity Schnorr-Euchner Sphere Decoders in MIMO Applications
Le Minh-Tuan ; Pham Van-Su ; Mai Linh ; Yoon Gi-Wan ;
Journal of information and communication convergence engineering, volume 4, issue 2, 2006, Pages 79~83
We present two techniques based on lookup tables to reduce complexity of the well-known Schnorr-Euchner (SE) sphere decoder (SD) without introducing performance degradation. By the aid of lookup tables, the computational loads caused by the SE enumeration and decision feedback are reduced at the cost of higher storage capacity. Simulation results are provided to verify performance and complexity of the proposed decoders.
Spatial Distribution of Localized Charge Carriers in SONOS Memory Cells
Kim Byung-Cheul ;
Journal of information and communication convergence engineering, volume 4, issue 2, 2006, Pages 84~87
Lateral distributions of locally injected electrons and holes in an oxide-nitride-oxide (ONO) dielectric stack of two different silicon-oxide-nitride-oxide-silicon (SONOS) memory cells are evaluated by single-junction charge pumping technique. Spatial distribution of electrons injected by channel hot electron (CHE) for programming is limited to length of the ONO region in a locally ONO stacked cell, while is spread widely along with channel in a fully ONO stacked cell. Hot-holes generated by band-to-band tunneling for erasing are trapped into the oxide as well as the ONO stack in the locally ONO stacked cell.
A New Planar Spiral Inductor with Multi-layered Bragg Reflector for Si-Based RFIC's
Mai Linh ; Lee Jae-Young ; Le Minh-Tuan ; Pham Van-Su ; Yoon Gi-Wan ;
Journal of information and communication convergence engineering, volume 4, issue 2, 2006, Pages 88~91
In this paper, a novel physical structure for planar spiral inductors is proposed. The spiral inductors were designed and fabricated on multi-layered substrate Bragg-reflector/silicon (BR/Si) wafer. The impacts of multi-layered structure substrate and pattern on characteristics of inductor were studied. Experimental results show that the inductor embedded on Bragg reflector/silicon substrate can achieve the best improvement. At 0.4-1.6 GHz, the Bragg reflector seems to significantly increase the S11-parameter of the inductor.
Remote Water Quality Warning System Using Water Fleas
Park Se-Hyun ; Kim Eung-Soo ; Park Se-Hoon ;
Journal of information and communication convergence engineering, volume 4, issue 2, 2006, Pages 92~96
Hardware for monitoring the water quality using water fleas is developed. Water flea is a frequently used biological sensor for monitoring the water quality. Water fleas quickly respond to the incoming toxic water by changing their activity when they are exposed. By measuring the activity of water fleas, the incoming toxic water is instantly detected. So far the measurement of activity of water fleas has been done with a system equipped with both a light source of LED and a light detector of photo transistor. Water flea itself is, however, sensitive to light resulting in incorrect response and the system has two inconvenient separate parts of the light source and the detector. This paper suggests a system using a CCD camera instead of a light source and a detector. The suggested system processes the image data from the CCD camera in real time without any delay. The developed system becomes a part of the remote water monitoring embedded system.