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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Institute of Electronics and Information Engineers
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Journal DOI :
The Institute of Electronics Engineers of Korea
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Volume & Issues
Volume 51, Issue 12 - Dec 2014
Volume 51, Issue 11 - Nov 2014
Volume 51, Issue 10 - Oct 2014
Volume 51, Issue 9 - Sep 2014
Volume 51, Issue 8 - Aug 2014
Volume 51, Issue 7 - Jul 2014
Volume 51, Issue 6 - Jun 2014
Volume 51, Issue 5 - May 2014
Volume 51, Issue 4 - Apr 2014
Volume 51, Issue 3 - Mar 2014
Volume 51, Issue 2 - Feb 2014
Volume 51, Issue 1 - Jan 2014
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An Adaptive Joint Precoding for Multi-user MIMO Systems
Park, Ju Yong ; Hanif, Mohammad Abu ; Song, Sang Seob ; Lee, Moon Ho ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 12, 2014, Pages 3~11
DOI : 10.5573/ieie.2014.51.12.003
Multiple antennas can provide huge capacity gains when the transmitter knows the channel state information (CSI). Precoding is a technique that exploits CSI at the transmitter side. In this paper, an adaptive precoding scheme is proposed, called a hybrid multiple-input multiple-output (MIMO) precoding (HMP). HMP is a combination of linear and nonlinear precoding. The number of transmit antennas less than or equal to four is as same as the conventional antenna selection scheme. Therefore, the HMP scheme uses more than four transmit antennas. The good channel means that the channels must be selected to maximize the channel capacity among the given channels, and the rest channels are called bad channel. In HMP scheme, we use the nonlinear precoding in the good channels and the linear precoding in the bad channels. The well-known Tomlinson-Harashima precoding (THP) is considered as nonlinear precoding. The system throughput and MSE (minimum square error) are shown for the performance of HMP scheme compared to the conventional schemes which are BD (block diagonalization), antenna selection and THP.
Advanced Rake Receiver for Multiple Access M-ary Modulation UWB System in the IEEE Multipath Channel
An, Jinyoung ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 12, 2014, Pages 12~19
DOI : 10.5573/ieie.2014.51.12.012
In this paper, an advanced UWB (ultra wideband) Rake receiving technique based on the statistical distribution model is studied in the M-ary TH-PPM system with multiple access interference (MAI). In order to improve the performance of the Rake receiver, the stochastic model, which can flexibly express the behavior of MAI-plus-noise, is required and the Laplace distribution and the generalized normal Laplace (GNL) model applied by the curtosis matching method are considered. The performance of Rake receiver based on each probability distribution is evaluated in the IEEE multipath fading channel and compared to that of the conventional Rake receiver. The suggested approach shows a superior BER performance than that of conventional Rake receiver.
Performance Evaluation of Scheduling Algorithm for VoIP under Data Traffic in LTE Networks
Kim, Sung-Ju ; Lee, Jae Yong ; Kim, Byung Chul ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 12, 2014, Pages 20~29
DOI : 10.5573/ieie.2014.51.12.020
Recently, LTE is preparing to make a new leap forward LTE-A all over the world. As LTE privides high speed service, the role of mobile phones seems to change from voice to data service. According to Cisco, global mobile data traffic will increase nearly 11-fold between 2013 and 2018. Mobile video traffic will reach 75% by 2018 from 66% in 2013 in Korea. However, voice service is still the most important role of mobile phones. Thus, controllability of throughput and low BLER is indispensable for high-quality VoIP service among various type of traffic. Although the maximum AMR-WB, 23.85 Kbps is sufficient to a VoIP call, it is difficult for the LTE which can provide tens to hundreds of MB/s may not keep the certain level VoIP QoS especially in the cell-edge area. This paper proposes a new scheduling algorithm in order to improve VoIP performance after analyzing various scheduling algorithms. The proposal is the technology which applies more priority processing for VoIP than other applications in cell-edge area based on two-tier scheduling algorithm. The simulation result shows the improvement of VoIP performance in the view point of throughput and BLER.
Cross-layer Design and its Performance Evaluation of Joint Routing and Scheduling for Maximizing Network Capacity of Wireless Mesh Networks
Min, Seokhong ; Kim, Byungchul ; Lee, Jaeyong ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 12, 2014, Pages 30~45
DOI : 10.5573/ieie.2014.51.12.030
Recently, multimedia application users who demand for ubiquitous computing environment are rapidly increasing, and wireless mesh network is receiving attention as a cost-effective key technology for next generation wireless networking. When multiple flows are transmitting data at the same time in the network, routing for path selection of each flow and link resource allocation for data transmission of each flow are one of the key factors that influence to the effectiveness of the network directly. In this paper, we consider problems for path discovery and resource allocation of links at the same time and we propose an algorithm based on mathematical modeling using a technique for cross-layer optimization design in STDMA-based wireless mesh networks that can enhance transfer performance for each flow. We show by performance analysis that the proposed algorithm can enhance the throughput performance by maximally utilizing given bandwidth resources when the number of flows increase in multi-hop wireless mesh networks.
Performance Analysis of High-Speed Transmission Line for Terabit Per Second Switch Fabric Interface
Choi, Chang-Ho ; Kim, Whan-Woo ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 12, 2014, Pages 46~55
DOI : 10.5573/ieie.2014.51.12.046
PCB design technology for high-speed transmission line has been developed continuously. Adapting to the high capacity of the communication system, switch fabric interface used for backplane is being standardized to accommodate more than 10Gbps serial interface. In this paper, various computer simulations are performed to compare the performance of each transmission line per length according to PCB material, and also to analyze the effect from via stub length and crosstalk, for the purpose of applying 11.5Gbps serial interface as a switch fabric interface in tera-bit switching system. As a result of the simulation, important design issues, such as PCB material of each board supporting 8dB improvement in transmission loss using low loss PCB, maximum available stub length on transmission line via, whether or not to apply the backdrill process to the via, and the clearance of the differential pair between transmission lines, are determined. The most efficient system architecture which could be applied 11.5Gbps serial interface in all switch fabric interfaces is defined from the simulation results.
Measurement and Analysis of Gate Finger Number Dependence of Input Resistance for Sub-micron MOSFETs
Ahn, Jahyun ; Lee, Seonghearn ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 12, 2014, Pages 59~65
DOI : 10.5573/ieie.2014.51.12.059
Two input resistances converted from
-parameter of MOSFETs with various gate finger numbers Nf were measured in low frequency region. The 1/Nf dependent input resistance from
-parameter exhibits much lower values than that from
-parameter in the range of
. This 1/Nf dependence was theoretically verified by using Nf dependent nonlinear equation derived from a MOSFET equivalent circuit.
A Reconfigurable Analog Front-end Integrated Circuit for Medical Ultrasound Imaging Systems
Cha, Hyouk-Kyu ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 12, 2014, Pages 66~71
DOI : 10.5573/ieie.2014.51.12.066
This paper presents an analog front-end integrated circuit (IC) for medical ultrasound imaging systems using standard
CMOS process. The proposed front-end circuit includes the transmit part which consists of 15-V high-voltage pulser operating at 2.6 MHz, and the receive part which consists of switch and a low-power low-noise preamplifier. Depending on the operation mode, the output driver in the transmit pulser can be reconfigured as the switch in the receive path and thus the area of the overall front-end IC is reduced by over 70% in comparison to previous work. The designed single-channel front-end prototype consumes less than
of core area and can be utilized as a key building block in highly-integrated multi-array ultrasound medical imaging systems.
TLC NAND-type Flash Memory Built-in Self Test
Kim, Jin-Wan ; Chang, Hoon ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 12, 2014, Pages 72~82
DOI : 10.5573/ieie.2014.51.12.072
Recently, the size of semiconductor industry market is constantly growing, due to the increase in diffusion of smart-phone, tablet PC and SSD(Solid State Drive). Also, it is expected that the demand for TLC NAND-type flash memory would gradually increase, with the recent release of TLC NAND-type flash memory in the SSD market. There have been a lot of studies on SLC NAND flash memory, but no research on TLC NAND flash memory has been conducted, yet. Also, a test of NAND-type flash memory is depending on a high-priced external equipment. Therefore, this study aims to suggest a structure for an autonomous test with no high-priced external test device by modifying the existing SLC NAND flash memory and MLC NAND flash memory test algorithms and patterns and applying them to TLC NAND flash memory.
A Fully Integrated Ku-band CMOS VCO with Wide Frequency Tuning
Kim, Young Gi ; Hwang, Jae Yeon ; Yoon, Jong Deok ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 12, 2014, Pages 83~89
DOI : 10.5573/ieie.2014.51.12.083
A ku-band complementary cross-coupled differential voltage controlled oscillator is designed, measured and fabricated using
CMOS technology. A 2.4GHz of very wide frequency tuning at oscillating frequency of 14.5GHz is achieved with presented circuit topology and MOS varactors. Measurement results show -1.66dBm output power with 18mA DC current drive from 3.3V power supply. When 5V is applied, the output power is increased to 0.84dBm with 47mA DC current. -74.5dBc/Hz phase noise at 100kHz offset is measured. The die area is
A VHF/UHF-Band Variable Gain Low Noise Amplifier for Mobile TV Tuners
Nam, Ilku ; Lee, Ockgoo ; Kwon, Kuduck ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 12, 2014, Pages 90~95
DOI : 10.5573/ieie.2014.51.12.090
This paper presents a VHF/UHF-band variable gain low noise amplifier for multi-standard mobile TV tuners. A proposed VHF-band variable gain amplifier is composed of a resistive shunt-feedback low noise amplifier to remove external matching components, a single-to-differential amplifier with input PMOS transcoductors to improve low frequency noise performance, a variable shunt-feedback resistor and an attenuator to control variable gain range. A proposed UHF-band variable gain amplifier consists of a narrowband low noise amplifier with capacitive tuning to improve noise performance and interference rejection performance, a single-to-differential with gm gain control and an attenuator to adjust gain control range. The proposed VHF-band and UHF-band variable gain amplifier were designed in a
RF CMOS technology and draws 22 mA and 17 mA from a 1.8 V supply voltage, respectively. The designed VHF-band and UHF-band variable gain amplifier show a voltage gain of 27 dB and 27 dB, a noise figure of 1.6-1.7 dB and 1.3-1.7 dB, OIP3 of 13.5 dBm and 16 dBm, respectively.
Packet Scheduling Algorithm for QoS Enhancement in WBAN
Kim, JiWon ; Kim, Jinhyuk ; Choi, SangBang ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 12, 2014, Pages 99~108
DOI : 10.5573/ieie.2014.51.12.099
WBAN(Wireless Body Area Network) is network to support medical and non-medical services. It is susceptible to loss and delay of data. WBAN is required to satisfy many kinds of demands such as a variety of data rate and a data priority for providing various service. In this paper scheduling algorithm, considering a data priority and transmission delay time, is proposed to improve service quality of WBAN. The proposed algorithm operates by allocating a channel to a flow with longer transmission delay. When a packet, in a queue of herb, is left within a certain period, the packet is assigned a channel and transmitted according to a data priority. Through the comparison with other existing scheduling algorithms, it is confirmed that QoS is improved due to higher arrival probability of medical data and less delay time in the proposed algorithm.
Patient Respiratory Motion Tracking Using Visual Coded Markers
Wijenayake, Udaya ; Park, Soon-Yong ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 12, 2014, Pages 111~122
DOI : 10.5573/ieie.2014.51.12.111
As radiotherapy has become one of the widely used techniques in cancer treatment, accurate tracking of patient`s respiratory motion is considered to be more important in treatment planning and dose calculations. Inaccurate motion tracking can cause severe issues such as errors in target/normal tissue delineation and increasing the volume of healthy tissues exposed to high doses. Different methods have been introduced to estimate the respiratory motion, but most of them require some electronic devices or expensive materials. As an inexpensive and easy to use alternative to the previous methods, we propose a new 3D respiratory motion tracking method by using stereo vision techniques of detecting and decoding visual coded markers.
Driver Assistance System By the Image Based Behavior Pattern Recognition
Kim, Sangwon ; Kim, Jungkyu ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 12, 2014, Pages 123~129
DOI : 10.5573/ieie.2014.51.12.123
In accordance with the development of various convergence devices, cameras are being used in many types of the systems such as security system, driver assistance device and so on, and a lot of people are exposed to these system. Therefore the system should be able to recognize the human behavior and support some useful functions with the information that is obtained from detected human behavior. In this paper we use a machine learning approach based on 2D image and propose the human behavior pattern recognition methods. The proposed methods can provide valuable information to support some useful function to user based on the recognized human behavior. First proposed one is "phone call behavior" recognition. If a camera of the black box, which is focused on driver in a car, recognize phone call pose, it can give a warning to driver for safe driving. The second one is "looking ahead" recognition for driving safety where we propose the decision rule and method to decide whether the driver is looking ahead or not. This paper also shows usefulness of proposed recognition methods with some experiment results in real time.
Video Deblurring using Camera Motion Estimation and Patch-wise Deconvolution
Jeong, Woojin ; Park, Jin Wook ; Lee, Jong Min ; Song, Tae Eun ; Choi, Wonju ; Moon, Young Shik ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 12, 2014, Pages 130~139
DOI : 10.5573/ieie.2014.51.12.130
Undesired camera shaking can make a blur effect, which causes a degradation of video quality. We propose an efficient method of removing the blur effects on video captured from a single camera. The proposed method has a sequential process that is applied to each frame. The first stage is to estimate the camera motion for each frame. In order to estimate the camera motion, we compute the optical flow using 3 consecutive frames. Then a patch-wise image deconvolution is applied. During the deconvolution, edge prediction is used to improve the quality of image deconvolution. After patch-wise image deconvolution, deblurred patches are integrated into an image to produce a deblurred frame. The above process is performed for each frame. The experimental result shows that the proposed method removes the blur effect efficiently.
Image Enhancement using Intensity Deviation of Boundary Regions
Hwang, Jae-Min ; Kwon, Oh-Seol ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 12, 2014, Pages 140~149
DOI : 10.5573/ieie.2014.51.12.140
Image enhancement has become an important area of study with the recent development of hi-fidelity devices, such as UHD displays. While conventional methods are able to enhance the image contrast and detail, this sometimes results in contrast reversion in boundary region. Therefore, this paper proposes the use of multi-layers and intensity deviation in boundary areas to enhance the perceived image quality. First, the image contrast of individual blocks is enhanced using multi-layers with different sizes. After calculating the block boundaries, weights are then determined based on the intensity deviation and used to enhance the image detail. Experiments with several test images confirm that the proposed algorithm is superior that image contrast and detail to conventional methods.
Fast Non-integer Motion Estimation for HEVC Encoder
Han, Woo-Jin ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 12, 2014, Pages 150~159
DOI : 10.5573/ieie.2014.51.12.150
The latest video coding standard, HEVC can improve the coding efficiency significantly compared with the H.264/AVC. However the HEVC encoder requires much larger computational complexities. The longer 8-tap interpolation filter of the HEVC which is used in a non-integer motion estimation is one of the reasons and this paper aims to reduce the computational complexities. First of all, three shorter-tap interpolation filters for a motion estimation process are tested rather than the use of a standard interpolation filter. In addition, the fast searching strategies to reduce the number of comparisons for choosing the best non-integer motion vector are proposed. Finally, the interpolation process is selectively applied according to the searching strategy. By combining all of the techniques, the experimental results show that the encoding times can be reduced by 13.6%, 18.5% and 21.1% with the coding efficiency penalties of 0.7%, 1.5% and 2.5%, respectively. For the full-HD video sequences, the coding efficiency penalties are reduced to 0.4%, 1.1% and 1.6% at the same level of the encoding time savings, which shows the effectiveness of the proposed schemes for the high resolution video sequences.
Development of Automatized Quantitative Analysis Method in CT Images Evaluation using AAPM Phantom
Noh, Sung Sun ; Um, Hyo Sik ; Kim, Ho Chul ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 12, 2014, Pages 163~173
DOI : 10.5573/ieie.2014.51.12.163
When evaluating the spatial resolution images and evaluation of low contrast resolution using CT standard phantom, and might present a automated quantitative evaluation method for minimizing errors by subjective judgment of the evaluator be, and try to evaluate the usefulness. 120kVp and 250mAs, 10mm collimation, SFOV(scan field of view) of 25cm or more than, exposure conditions DFOV(display field of view) of 25cm, and were evaluated the 24 passing images and 20 failing images taken using a standard reconstruction algorithm by using the Nuclear Associates, Inc. AAPM CT Performance Phantom(Model 76-410). Quantitative evaluation of low contrast resolution and spatial resolution was using an evaluation program that was self-developed using the company Mathwork Matlab(Ver. 7.6. (R2008a)) software. In this study, the results were evaluated using the evaluation program that was self-developed in the evaluation of images using CT standard phantom, it was possible to evaluate an objective numerical qualitative evaluation item. First, if the contrast resolution, if EI is 0.50, 0.51, 0.52, 0.53, as a result of evaluating quantitatively the results were evaluated qualitatively match. Second, if CNR is -0.0018~-0.0010, as a result of evaluating quantitatively the results were evaluated qualitatively match. Third, if the spatial resolution, as a result of using a image segmentation technique, and automatically extract the contour boundary of the hole, as a result of evaluating quantitatively the results were evaluated qualitatively match.
Study on The Planning and Operation of Training Education in Radiologic Science for Reduced x-ray Exposure
Kil, Jong-Won ; Park, Jung-Ho ; Kim, Yong-Gwon ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 12, 2014, Pages 174~179
DOI : 10.5573/ieie.2014.51.12.174
In this study, we measure the radiation dose for every experiments performed during the training education in radiologic science and estimate the radiation dose to each participant in the training education to propose a safe curriculum including operation of the training education. In this paper, we optimized the three parameters and the results show the dramatically reduced radiation dose to each participant. The proposed arrangement of the subjects and operation of the training education will be very helpful to reorganize the curriculum and the subject operation and will protect the students from the radiation dose.
The Research to Correct Overestimation in TOF-MRA for Severity of Cerebrovascular Stenosis
Han, Yong Su ; Kim, Ho Chul ; Lee, Dong Young ; Lee, Su Cheol ; Ha, Seung Han ; Kim, Min Gi ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 12, 2014, Pages 180~188
DOI : 10.5573/ieie.2014.51.12.180
It is very important accurate diagnosis and quick treatment in cerebrovascular disease, i.e. stenosis or occlusion that could be caused by risk factors such as poor dietary habits, insufficient exercise, and obesity. Time-of-flight magnetic resonance angiography (TOF-MRA), it is well known as diagnostic method without using contrast agent for cerebrovascular disease, is the most representative and reliable technique. Nevertheless, it still has measurement errors (also known as overestimation) for length of stenosis and area of occlusion in celebral infarction that is built by accumulation and rupture of plaques generated by hemodynamic turbulence. The purpose of this study is to show clinical trial feasibility for 3D-SPACE T2, which is improved by using signal attenuation effects of fluid velocity, in diagnosis of cerebrovascular disease. To model angiostenosis, strictures of different proportions (40%, 50%, 60%, and 70%) and virtual blood stream (normal saline) of different velocities (0.19 ml/sec, 1.5 ml/sec, 2.1 ml/sec, and 2.6 ml/sec) by using dialysis were made. Cross-examinations were performed for 3D-SPACE T2 and TOF-MRA (16 times each). The accuracy of measurement for length of stenosis was compared in all experimental conditions. 3D-SPACE 2T has superiority in terms of accuracy for measurements of the length of stenosis, compared with TOF-MRA. Also, it is robust in fast blood stream and large stenosis than TOF-MRA. 3D-SPACE 2T will be promising technique to increase diagnosis accuracy in narrow complex lesions as like two cerebral small vessels with stenosis, created by hemodynamic turbulence.
Design and Fabrication of HgI2 Sensor for Phosphor Screen based flat panel X-ray Detector
Park, Ji Koon ; Jung, Bong Jae ; Choi, Il Hong ; Noh, Si Cheol ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 12, 2014, Pages 189~194
DOI : 10.5573/ieie.2014.51.12.189
In this study, from a new x-ray detector that combines a columnar CsI:Na scintillation layer with a photosensitive mercuric iodide layer was investigated. In this structure, X-rays are converted into visible light on a thick CsI:Na layer, which is then converted to electric charges in a thin
bottom layer. The thin coplanar mercuric iodide films as a photosensitive converter requiring only a few tens of volts of bias, associated with a thick columnar coating of phosphor layer, were simulated and designed. The results of this research suggest that the new coplanar x-ray detector with a hybrid-type structure can resolve the following problems: high voltage from the a-Se, and low conversion efficiency from the indirect conversion method. The results of this research suggest that the new CsI:Na/
x-ray detector with a double-layer type structure can resolve the following problems: high voltage from the direct conversion method, and low conversion efficiency from the indirect conversion method.
Calculation Method of Transient Potential Rises of Horizontal Ground Electrodes Depending on Injection Point of the Ground Current
Ahn, Chang-Hwan ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 12, 2014, Pages 197~203
DOI : 10.5573/ieie.2014.51.12.197
When the lightning current is injected to the ground system of information and communication facilities, analysis of the transient potential rise in the ground system is one of main factors to effectively design the ground system. The performance of grounding systems is normally estimated with the grounding impedance and the transient potential rise which represents the electrical characteristics of the grounding system. The method for calculating the grounding impedance depending on the injection point of the lightning current was proposed. The delta-gap source model was proposed to calculate the grounding impedance in the case that the lightning current is injected to the center of the horizontal ground electrode. A new program which is possible to apply the frequency-dependent soil parameters using the Debye model was developed, because a commercial program for analyzing the performance of the grounding system can not apply to the frequency-dependent soil parameters. The experiment was carried out to confirm the availability of the simulation results with the same condition. Finally, the transient potential rises of a horizontal ground electrode depending on the lightning current waveforms were analyzed by using the results of the grounding impedance which is associated with the frequency-dependent soil parameters.
Resource Adaptive QoS Management for Q-MOTP in MPLS Network
Choi, Won-Keun ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 12, 2014, Pages 204~209
DOI : 10.5573/ieie.2014.51.12.204
This paper has described a QoS mechanism and management for multimedia object transport protocol. Resource manager reports the system resource information to the QoS manager. Based on the combination of two informations, the more effective QoS management can be achieved by organic combination between them on the protocol time domain. Therefore, it is possible for QoS manager to decide call admission control quickly and detect and react the performance fluctuations in protocol time domain.
Applying a Two-channel Video Streaming Technology Front and Rear Vehicle Wireless Video Monitoring System
Na, HeeSu ; Won, YoungJin ; Yoon, JungGeun ; Lee, SangMin ; Ahn, MyeongIl ; Kim, DongHyun ; Moon, JongHoon ;
Journal of the Institute of Electronics and Information Engineers, volume 51, issue 12, 2014, Pages 210~216
DOI : 10.5573/ieie.2014.51.12.210
In this paper, it was proposed to develop front and rear image monitoring system for vehicle that help a driver to cope with urgent situation about a dangerous element. When parking a vehicle, the risk factors to be formed by the dead zone can be resolved by using anterior and posterior cameras of the vehicle. In embedded system environment, a SoC(System on Chip) and two high-resolution CMOS (Complementary metal-oxide-semiconductor) image sensors were used to transfer two high-resolution image data through he TCP/ IP-based network. To transfer image data through he TCP/ IP-based network, the images received by two cameras were compressed by using H.264 and they were transmitted with wireless method(Wi-Fi) by using real-time transport protocol (Real-time Transport Protocol). Transmission loss, transmission delay and transmission limit were solved in wireless (Wi-Fi) environment and the bit-rate of two image data compressed by H.264 was adjusted. And the system for the optimal transmission in wireless (Wi-Fi) environment was materialized and experimented.