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2008 International Symposium on Communications and Information Technologies最新文献

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Statistical Characteristic Measurements of Propagation in Durian Orchard for Sensor Network at 5.8 GHz 5.8 GHz传感器网络在榴莲果园传播的统计特性测量
2008 International Symposium on Communications and Information Technologies Pub Date : 2008-12-08 DOI: 10.1109/ISCIT.2008.4700246
K. Phaebua, R. Suwalak, C. Phongcharoenpanich, M. Krairiksh
{"title":"Statistical Characteristic Measurements of Propagation in Durian Orchard for Sensor Network at 5.8 GHz","authors":"K. Phaebua, R. Suwalak, C. Phongcharoenpanich, M. Krairiksh","doi":"10.1109/ISCIT.2008.4700246","DOIUrl":"https://doi.org/10.1109/ISCIT.2008.4700246","url":null,"abstract":"The statistical characteristic measurement results of wireless sensor network in durian orchard at 5.8 GHz are presented. The measurement results are performed to study the channel characteristic of the radio wave propagation in the durian orchard. The communication channel is connected from sensor node to communication node and between communication node. The transmitter is setup at the bole of a durian tree for one communication node, and the received power by spectrum analyzer is used for the other communication node. Moreover, the transmitter is setup on the branch of durian tree for the sensor node placed on a durian. The signal strength is measured by spectrum analyzer. The sampling time of two seconds is employed to collect the signal strength for histogram plot. The statistical models, such as the Rican distribution and normal distribution are employed to fit the measurement results. These results can be used to approximate the statistical channel characteristics to predict the bit error rate in the wireless sensor network systems in durian orchard at 5.8 GHz.","PeriodicalId":215340,"journal":{"name":"2008 International Symposium on Communications and Information Technologies","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133342366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Signal Contiguity Based Wideband Spectrum Sensing for Dynamic Spectrum Access Systems 基于信号连续的动态频谱接入系统宽带频谱感知
2008 International Symposium on Communications and Information Technologies Pub Date : 2008-12-08 DOI: 10.1109/ISCIT.2008.4700167
Bin Shen, Chengshi Zhao, Longyang Huang, Zheng Zhou, K. Kwak
{"title":"Signal Contiguity Based Wideband Spectrum Sensing for Dynamic Spectrum Access Systems","authors":"Bin Shen, Chengshi Zhao, Longyang Huang, Zheng Zhou, K. Kwak","doi":"10.1109/ISCIT.2008.4700167","DOIUrl":"https://doi.org/10.1109/ISCIT.2008.4700167","url":null,"abstract":"This paper investigates energy detection based wideband spectrum sensing for dynamic spectrum access (DSA) systems. The licensed frequency band of interest is resolved into a series of contiguous frequency bins via the FFT engine of the detector. By employing forward consecutive mean excision (FCME) algorithm and exploiting primary user (PU) signal's contiguity in frequency domain, computationally simple pre-processing of raw spectrum observation data and post-detection processing of decisions are proposed to perform frequency bin cluster based spectrum sensing. It is verified through simulations that these signal contiguity based sensing schemes can significantly increase the PU signal detection rate while at the same time maintaining the false-alarm rate sufficiently close to the desired constant one.","PeriodicalId":215340,"journal":{"name":"2008 International Symposium on Communications and Information Technologies","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115589176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Hybrid Controller for Inverted Pendulum System 倒立摆系统的混合控制器
2008 International Symposium on Communications and Information Technologies Pub Date : 2008-12-08 DOI: 10.1109/ISCIT.2008.4700219
S. Panya, T. Benjanarasuth, S. Nundrakwang, J. Ngamwiwit, N. Komine
{"title":"Hybrid Controller for Inverted Pendulum System","authors":"S. Panya, T. Benjanarasuth, S. Nundrakwang, J. Ngamwiwit, N. Komine","doi":"10.1109/ISCIT.2008.4700219","DOIUrl":"https://doi.org/10.1109/ISCIT.2008.4700219","url":null,"abstract":"In this paper, a hybrid controller designed for swinging up and stabilizing an inverted pendulum on cart system is presented. The controller composes of a PD controller and a sliding mode controller. The PD controller is implemented to control the position of the cart to swing up the pendulum from the natural pendent position to around the upright position, while the sliding mode controller is implemented to stabilize the inverted pendulum in the upright position. Root-locus method is applied to design the PD controller and LQR method is employed to design the sliding mode controller. The implementation results of the proposed hybrid controller are shown in this paper.","PeriodicalId":215340,"journal":{"name":"2008 International Symposium on Communications and Information Technologies","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115774907","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Energy Detection Based Spectrum Sensing for Cognitive Radios in Noise of Uncertain Power 不确定功率噪声下基于能量检测的认知无线电频谱感知
2008 International Symposium on Communications and Information Technologies Pub Date : 2008-12-08 DOI: 10.1109/ISCIT.2008.4700269
B. Shent, Longyang Huang, Chengshi Zhao, Zheng Zhou, K. Kwak
{"title":"Energy Detection Based Spectrum Sensing for Cognitive Radios in Noise of Uncertain Power","authors":"B. Shent, Longyang Huang, Chengshi Zhao, Zheng Zhou, K. Kwak","doi":"10.1109/ISCIT.2008.4700269","DOIUrl":"https://doi.org/10.1109/ISCIT.2008.4700269","url":null,"abstract":"Energy detection based spectrum sensing has been proposed and studied widely for primary user (PU) signal detection in the literature. With the help of multiple secondary users (SU) in the cognitive radio network, various cooperative sensing schemes are investigated to enhance the energy detection performance. However, the impacts of noise power fluctuating effects on the detection performance in multipath fading and user cooperative sensing scenarios are seldom evaluated in relevant literature. In this paper, a modified version of the classic energy detection model is presented, where the noise power uncertainty (U) is introduced into threshold setting. With a reasonable approximate derivation, we provide accurate predictions of SNRwall constraints imposed by U in Rayleigh fading environments. In addition, by employing a simple hard decision fusion rule, the collaborative gain in spectrum sensing performance is also quantified with respect to U. Our analysis and numerical results confirm that collaboration can significantly improve the spectrum sensing performance in a noise power fluctuating environment.","PeriodicalId":215340,"journal":{"name":"2008 International Symposium on Communications and Information Technologies","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115435150","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 77
Asynchronous High-Speed Combination Logic Circuitry using LTPS-TFT and BST for LCD Panel 基于LTPS-TFT和BST的LCD面板异步高速组合逻辑电路
2008 International Symposium on Communications and Information Technologies Pub Date : 2008-12-08 DOI: 10.1109/ISCIT.2008.4700179
T. Sato, Y. Suzuki, Y. Suga
{"title":"Asynchronous High-Speed Combination Logic Circuitry using LTPS-TFT and BST for LCD Panel","authors":"T. Sato, Y. Suzuki, Y. Suga","doi":"10.1109/ISCIT.2008.4700179","DOIUrl":"https://doi.org/10.1109/ISCIT.2008.4700179","url":null,"abstract":"In this paper, an asynchronous high-speed logic circuitry using low temperature poly silicon-thin film transistor (LTPS-TFT) and the bootstrapped technology (BST) for liquid crystal display (LCD) is proposed. The proposed logic circuit operates at high frequency region owing to the deep non-saturation operation by using the bootstrapped technology. To confirm some characteristics of the proposed circuit, an inverter and a NAND gate circuits are simulated. As the results, the power delay products are about 1/3 times less value than that of the conventional circuit under the conditions of +10 V power supply voltage and 0.5 pF load capacitor.","PeriodicalId":215340,"journal":{"name":"2008 International Symposium on Communications and Information Technologies","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122144055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
FPGA Implementation of Winny Packets Detection for Mobile Computing 移动计算Winny数据包检测的FPGA实现
2008 International Symposium on Communications and Information Technologies Pub Date : 2008-12-08 DOI: 10.1109/ISCIT.2008.4700183
T. Sato, S. Imaruoka, M. Fukase
{"title":"FPGA Implementation of Winny Packets Detection for Mobile Computing","authors":"T. Sato, S. Imaruoka, M. Fukase","doi":"10.1109/ISCIT.2008.4700183","DOIUrl":"https://doi.org/10.1109/ISCIT.2008.4700183","url":null,"abstract":"IPS is crucial for Internet community. Especially, it is true for mobile computing due to its diversity. Since IPS has been developed in the form of software, it has problems of CPU resources, processing speed, and failure risk due to interference with applications. Thus, they cannot be installed in mobile platforms. In order to overcome the shortcoming of software IPS, we have so far exploited a hardware-and host-based IPS or H-HIPS. We focus in this paper the implementation of Winny packets detection unit in H-HIPS considering its importance. Although Winny is a useful file exchanging software, it is also a cause of information leakage. This is serious in view of especially corporation, government, and academic. Firstly, we exploit a detection algorithm. Then, it is implemented in FPGA. This is compared with regular software IPS. Although FPGA is slower than PC used in running IPS, it is 300 times higher.","PeriodicalId":215340,"journal":{"name":"2008 International Symposium on Communications and Information Technologies","volume":"141 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116407305","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Derivative State Constrained Optimal H2 Controller for Torsional Vibration with Constant Disturbance 常扰动扭转振动的导数状态约束最优H2控制器
2008 International Symposium on Communications and Information Technologies Pub Date : 2008-12-08 DOI: 10.1109/ISCIT.2008.4700240
N. Komine, R. Nakmura, S. Tomiyama, X. Dittaphong
{"title":"Derivative State Constrained Optimal H2 Controller for Torsional Vibration with Constant Disturbance","authors":"N. Komine, R. Nakmura, S. Tomiyama, X. Dittaphong","doi":"10.1109/ISCIT.2008.4700240","DOIUrl":"https://doi.org/10.1109/ISCIT.2008.4700240","url":null,"abstract":"It is shown that the derivative state constrained optimal H2 integral problems can be reduced to the standard optimal H2 control problem. In this paper, the derivative state constrained optimal H2 integral controller is presented based on the optimal H2 control problem with a prescribed degree of stability to control under damped responses of the linear systems. And the experimental results show that the proposed method is also effectiveness to reduce the damping for the torsional vibration based on two-inertia system.","PeriodicalId":215340,"journal":{"name":"2008 International Symposium on Communications and Information Technologies","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132651367","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Robust Multiuser Downlink Beamforming with Per Antenna Power Constraints using Worst-Case Performance Optimization 基于最坏情况性能优化的单天线功率约束下鲁棒多用户下行波束形成
2008 International Symposium on Communications and Information Technologies Pub Date : 2008-12-08 DOI: 10.1109/ISCIT.2008.4700144
V. Sharma, S. Lambotharan
{"title":"Robust Multiuser Downlink Beamforming with Per Antenna Power Constraints using Worst-Case Performance Optimization","authors":"V. Sharma, S. Lambotharan","doi":"10.1109/ISCIT.2008.4700144","DOIUrl":"https://doi.org/10.1109/ISCIT.2008.4700144","url":null,"abstract":"We propose a robust solution to the problem of multiuser downlink beamforming with constraints on per antenna power and quality of services (QoS). We assume only the erroneous channel state information (CSI) is available at the transmitter, which may arise due to quantization, feedback delay, feedback error, etc., and solve this problem within the framework of worst-case performance optimization. Simulations results confirm that the worst-case based robust solution outperforms the existing non-robust solutions and satisfies the QoS constraints with probability one while the non-robust scheme satisfies the QoS only with an outage probability of 0.5.","PeriodicalId":215340,"journal":{"name":"2008 International Symposium on Communications and Information Technologies","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116664979","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
A New Similarity Measure for Content-Based Image Retrieval Using the Multidimensional Generalization of the Wald-Wolfowitz Runs Test 基于Wald-Wolfowitz运行测试多维泛化的基于内容的图像检索相似度度量
2008 International Symposium on Communications and Information Technologies Pub Date : 2008-12-08 DOI: 10.1109/ISCIT.2008.4700159
T. Leauhatong, K. Hamamoto, K. Atsuta, S. Kondo
{"title":"A New Similarity Measure for Content-Based Image Retrieval Using the Multidimensional Generalization of the Wald-Wolfowitz Runs Test","authors":"T. Leauhatong, K. Hamamoto, K. Atsuta, S. Kondo","doi":"10.1109/ISCIT.2008.4700159","DOIUrl":"https://doi.org/10.1109/ISCIT.2008.4700159","url":null,"abstract":"This paper proposes a new similarity measure for the content-based image retrieval (CBIR) systems. The similarity measure is based on the multidimensional generalization of the Wald-Wolfowitz (MWW) runs test and the k-means clustering algorithm. The performance comparisons between the proposed method and the current CBIR method based on MWW runs test were performed, and it can be seen that the proposed methods outperform the current method in the sense that the proposed method provides higher performance than the current method for the same computational time.","PeriodicalId":215340,"journal":{"name":"2008 International Symposium on Communications and Information Technologies","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131530801","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Blind Channel Identification Using Interpolation 利用插值法进行盲信道识别
2008 International Symposium on Communications and Information Technologies Pub Date : 2008-12-08 DOI: 10.1109/ISCIT.2008.4700274
H. Murakam
{"title":"Blind Channel Identification Using Interpolation","authors":"H. Murakam","doi":"10.1109/ISCIT.2008.4700274","DOIUrl":"https://doi.org/10.1109/ISCIT.2008.4700274","url":null,"abstract":"In most of digital communication systems, low-pass filters are placed at a transmitter to confine the transmitting waveform to an allocated bandwidth and at a receiver to improve signal-to-noise power ratio. Consequently, if the received waveform is sampled with sufficiently fast rate, the resulting discrete-time signal is band-limited and exhibits a smooth waveform. The proposed method exploits this smooth property for estimating the channel impulse response, via an interpolation formula. One block of transmission is sufficient to estimate the channel, making the method suitable for mobile communication environment, in which the channel characteristic changes in a relatively short time span. No knowledge of input statistics or the autocorrelation of the received signals is required.","PeriodicalId":215340,"journal":{"name":"2008 International Symposium on Communications and Information Technologies","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128372604","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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