Jeonghong Park, Dongin Park, Seungki Cho, Jihong Lee, Yunho Ko, Youngwoo Park
In this paper, we propose a 3D shape restoration system which measures height and surface of transparent ITO glass to compensate for focal length and incidence angle of laser beam to femtosecond laser micromachining. The proposed system is composed of line laser, high resolution camera, linear motion guide synchronized to image capturing and control station. To optimize positions of components, we define sensitivity index that represents the effect between measurement error and the position of a camera and line laser. The results of the proposed system are verified by comparing with the results of SPM (scanning probe microscope) and prove the usefulness of the system.
{"title":"Optimal Design and Implementation of 3D Shape Restoration System for Femtosecond Laser Micromachining","authors":"Jeonghong Park, Dongin Park, Seungki Cho, Jihong Lee, Yunho Ko, Youngwoo Park","doi":"10.1109/CCE.2006.350825","DOIUrl":"https://doi.org/10.1109/CCE.2006.350825","url":null,"abstract":"In this paper, we propose a 3D shape restoration system which measures height and surface of transparent ITO glass to compensate for focal length and incidence angle of laser beam to femtosecond laser micromachining. The proposed system is composed of line laser, high resolution camera, linear motion guide synchronized to image capturing and control station. To optimize positions of components, we define sensitivity index that represents the effect between measurement error and the position of a camera and line laser. The results of the proposed system are verified by comparing with the results of SPM (scanning probe microscope) and prove the usefulness of the system.","PeriodicalId":148533,"journal":{"name":"2006 First International Conference on Communications and Electronics","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130655957","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}
This paper proposes a new interference cancellation scheme for multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) systems in the presence of intersymbol interference (ISI). The proposed interference cancellation scheme uses the estimated channel coefficients and the channel state information (CSI) to reproduce the interference components, then iteratively cancel them from the received signals. The so-called remodulation technique is also included in this scheme to enhance the interference cancellation performance. To illustrate the proposed method, we assume that the MIMO-OFDM system does not use a guard interval (spectral efficiency factor eta = 1). Simulation results show that the performance of system in terms of the symbol error ratio (SER) is significantly improved by applying one iteration of the proposed canceller. After two iterations, the SER is slightly better than the results obtained if the guard interval (GI) length is sufficient (eta = 0.87).
{"title":"Interference Cancellation for MIMO-OFDM Systems in the case of Insufficient Guard Interval Length","authors":"V. D. Nguyen","doi":"10.1109/CCE.2006.350817","DOIUrl":"https://doi.org/10.1109/CCE.2006.350817","url":null,"abstract":"This paper proposes a new interference cancellation scheme for multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) systems in the presence of intersymbol interference (ISI). The proposed interference cancellation scheme uses the estimated channel coefficients and the channel state information (CSI) to reproduce the interference components, then iteratively cancel them from the received signals. The so-called remodulation technique is also included in this scheme to enhance the interference cancellation performance. To illustrate the proposed method, we assume that the MIMO-OFDM system does not use a guard interval (spectral efficiency factor eta = 1). Simulation results show that the performance of system in terms of the symbol error ratio (SER) is significantly improved by applying one iteration of the proposed canceller. After two iterations, the SER is slightly better than the results obtained if the guard interval (GI) length is sufficient (eta = 0.87).","PeriodicalId":148533,"journal":{"name":"2006 First International Conference on Communications and Electronics","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114199187","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}
In a highly noisy environment, bone-conducted speech seems to be more advantageous than normal noisy speech because of its stability against surrounding noise. The sound quality of bone-conducted speech, however, is very low and restoring bone-conducted speech is a challenging new topic in speech signal processing field. In this paper, we propose a restoration model based on linear prediction (LP). To evaluate the ability of the LP-based model to improve the voice quality, we compared it with existing models using one subjective and three objective measurements. The experiments showed that the LP-based model yields restored signals that are better for both human hearing and for the front-ends of automatic speech recognition systems. As the restoration ability of the LP-based model depended on a few parameters related to the LP coefficients of air-conducted speech, we applied a multi-layer perceptron neural network to blindly predict them with reasonable results.
{"title":"A Study on an LP-based Model for Restoring Bone-conducted Speech","authors":"T. Vu, M. Unoki, M. Akagi","doi":"10.1109/CCE.2006.350802","DOIUrl":"https://doi.org/10.1109/CCE.2006.350802","url":null,"abstract":"In a highly noisy environment, bone-conducted speech seems to be more advantageous than normal noisy speech because of its stability against surrounding noise. The sound quality of bone-conducted speech, however, is very low and restoring bone-conducted speech is a challenging new topic in speech signal processing field. In this paper, we propose a restoration model based on linear prediction (LP). To evaluate the ability of the LP-based model to improve the voice quality, we compared it with existing models using one subjective and three objective measurements. The experiments showed that the LP-based model yields restored signals that are better for both human hearing and for the front-ends of automatic speech recognition systems. As the restoration ability of the LP-based model depended on a few parameters related to the LP coefficients of air-conducted speech, we applied a multi-layer perceptron neural network to blindly predict them with reasonable results.","PeriodicalId":148533,"journal":{"name":"2006 First International Conference on Communications and Electronics","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130548539","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}
Multiple input multiple output-orthogonal frequency division multiplexing (MIMO-OFDM) systems can provide significant space diversity and combat multi-path fading, thus attracting increasing attention for the design of future broadband wireless communication systems. One enhancement technique commonly used in such systems is adaptive modulation and coding (AMC) for link adaptation. With AMC, the modulation and coding scheme (MCS) is adaptively selected based on channel quality indication (CQI). In this paper, we give a comprehensive analysis of mapping between signal to interference plus noise ratio (SINR) fed beck by the mobile station and MCS to be used to transmit dada, while taking into account hybrid ARQ (HARQ) operation. Then we apply such mapping criteria to MIMO-OFDM systems and develop a systematic algorithm for MCS selection to maximize the system throughput. The performance of the proposed approach is evaluated by extensive system level simulation. Results indicate that compared to traditional MCS selection schemes significant system throughput gain can be achieved by this method.
{"title":"Analysis of Modulation and Coding Scheme Selection in MIMO-OFDM Systems","authors":"Shiming Liu, Xing Zhang, Wenbo Wang","doi":"10.1109/CCE.2006.350807","DOIUrl":"https://doi.org/10.1109/CCE.2006.350807","url":null,"abstract":"Multiple input multiple output-orthogonal frequency division multiplexing (MIMO-OFDM) systems can provide significant space diversity and combat multi-path fading, thus attracting increasing attention for the design of future broadband wireless communication systems. One enhancement technique commonly used in such systems is adaptive modulation and coding (AMC) for link adaptation. With AMC, the modulation and coding scheme (MCS) is adaptively selected based on channel quality indication (CQI). In this paper, we give a comprehensive analysis of mapping between signal to interference plus noise ratio (SINR) fed beck by the mobile station and MCS to be used to transmit dada, while taking into account hybrid ARQ (HARQ) operation. Then we apply such mapping criteria to MIMO-OFDM systems and develop a systematic algorithm for MCS selection to maximize the system throughput. The performance of the proposed approach is evaluated by extensive system level simulation. Results indicate that compared to traditional MCS selection schemes significant system throughput gain can be achieved by this method.","PeriodicalId":148533,"journal":{"name":"2006 First International Conference on Communications and Electronics","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125947573","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}
Adaptive middleware enables modifying the behavior of a distributed application after the application is developed in response to some changes in functional requirements or operating conditions. Several projects proposed adaptive middleware architectures for common-services of distributed applications. However adaptive middleware is still an ongoing research to enable reuse and separation of concern in each specific application-domain and domain-specific middleware services should also be widely available. In this paper, we present a novel adaptive middleware architecture for distributed applications, which allows adapting quality of service in both application-specific and application-neutral level.
{"title":"An Application-aware Adaptive Middleware Architecture for Distributed Multimedia Systems","authors":"Vũ Hoàng Duy Hiếu, Hoang Dang Hai","doi":"10.1109/CCE.2006.350837","DOIUrl":"https://doi.org/10.1109/CCE.2006.350837","url":null,"abstract":"Adaptive middleware enables modifying the behavior of a distributed application after the application is developed in response to some changes in functional requirements or operating conditions. Several projects proposed adaptive middleware architectures for common-services of distributed applications. However adaptive middleware is still an ongoing research to enable reuse and separation of concern in each specific application-domain and domain-specific middleware services should also be widely available. In this paper, we present a novel adaptive middleware architecture for distributed applications, which allows adapting quality of service in both application-specific and application-neutral level.","PeriodicalId":148533,"journal":{"name":"2006 First International Conference on Communications and Electronics","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129637547","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}
We propose a novel optical frequency-shift-keying (FSK) modulator with polarization-reversed structure. Using the three-branch waveguide interferometer, one optical side-band generated by RF modulation signal is enhanced but the optical carrier and the other optical side-band are suppressed at the same time. The enhanced optical side-band can be switched by the binary data-signal, therefore the optical FSK signal is generated.
{"title":"Proposal for Optical FSK Modulator Utilizing Polarization-Reversed Structure","authors":"H. V. Pham, H. Murata, Y. Okamura","doi":"10.1109/CCE.2006.350877","DOIUrl":"https://doi.org/10.1109/CCE.2006.350877","url":null,"abstract":"We propose a novel optical frequency-shift-keying (FSK) modulator with polarization-reversed structure. Using the three-branch waveguide interferometer, one optical side-band generated by RF modulation signal is enhanced but the optical carrier and the other optical side-band are suppressed at the same time. The enhanced optical side-band can be switched by the binary data-signal, therefore the optical FSK signal is generated.","PeriodicalId":148533,"journal":{"name":"2006 First International Conference on Communications and Electronics","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129675566","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}
Radio over fiber (RoF) techniques have been long recognized as the promising solution for indoor networking at millimeter-wave bands. We discuss the possible deployment scenarios of a RoF network for indoor environment. In this paper, we try to find the answer to the question as to which medium access control (MAC) protocol is suitable for an RoF network. To substantiate our claims, performance analysis of two popular MAC protocols employing RoF EEE 802.11 representing the distributed control protocol family and ETSI HiperLAN/2 representing the centralized family - is presented. We show that RoF techniques can be applied to both protocols. We also show that the centralized control protocol is an appropriate candidate for RoF networks. This study is expected to contribute to the speedy deployment of RoF for indoor network deployment.
{"title":"On the MAC protocols for Radio over Fiber indoor networks","authors":"B. Dang, R. V. Prasad, I. Niemegeers","doi":"10.1109/CCE.2006.350850","DOIUrl":"https://doi.org/10.1109/CCE.2006.350850","url":null,"abstract":"Radio over fiber (RoF) techniques have been long recognized as the promising solution for indoor networking at millimeter-wave bands. We discuss the possible deployment scenarios of a RoF network for indoor environment. In this paper, we try to find the answer to the question as to which medium access control (MAC) protocol is suitable for an RoF network. To substantiate our claims, performance analysis of two popular MAC protocols employing RoF EEE 802.11 representing the distributed control protocol family and ETSI HiperLAN/2 representing the centralized family - is presented. We show that RoF techniques can be applied to both protocols. We also show that the centralized control protocol is an appropriate candidate for RoF networks. This study is expected to contribute to the speedy deployment of RoF for indoor network deployment.","PeriodicalId":148533,"journal":{"name":"2006 First International Conference on Communications and Electronics","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121668529","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}
Pub Date : 2006-10-01DOI: 10.1504/ijsnet.2007.014365
Thinh P. Q. Nguyen, Dong Nguyen, Huaping Liu, D. Tran
This paper proposes a stochastic framework for detecting anomalies or gathering interesting events in a noisy environment using a sensor network consisting of binary sensors. A binary sensor is an extremely coarse sensor, capable of measuring data to only 1-bit accuracy. Our proposed stochastic framework employs a large number of cheap binary sensors operating in a noisy environment, yet collaboratively they are able to obtain accurate measurements. The main contributions of this paper are: (a) The theoretical accuracy analysis of the proposed stochastic binary sensor network, (b) an adaptive data collection framework based on the current measurements in order to reduce the energy consumption, and (c) a novel coding scheme for energy-efficient routing. To quantify the performance of our proposed stochastic approach, we present the simulation results of two stochastic binary sensor networks for anomaly detection using our proposed coding scheme and adaptive data gathering framework. For many scenarios, our proposed framework can reduce the energy consumption over the traditional approach by an order of magnitude.
{"title":"Stochastic Binary Sensor Networks for Noisy Environments","authors":"Thinh P. Q. Nguyen, Dong Nguyen, Huaping Liu, D. Tran","doi":"10.1504/ijsnet.2007.014365","DOIUrl":"https://doi.org/10.1504/ijsnet.2007.014365","url":null,"abstract":"This paper proposes a stochastic framework for detecting anomalies or gathering interesting events in a noisy environment using a sensor network consisting of binary sensors. A binary sensor is an extremely coarse sensor, capable of measuring data to only 1-bit accuracy. Our proposed stochastic framework employs a large number of cheap binary sensors operating in a noisy environment, yet collaboratively they are able to obtain accurate measurements. The main contributions of this paper are: (a) The theoretical accuracy analysis of the proposed stochastic binary sensor network, (b) an adaptive data collection framework based on the current measurements in order to reduce the energy consumption, and (c) a novel coding scheme for energy-efficient routing. To quantify the performance of our proposed stochastic approach, we present the simulation results of two stochastic binary sensor networks for anomaly detection using our proposed coding scheme and adaptive data gathering framework. For many scenarios, our proposed framework can reduce the energy consumption over the traditional approach by an order of magnitude.","PeriodicalId":148533,"journal":{"name":"2006 First International Conference on Communications and Electronics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130698078","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}
Fairness of competing TCP flows is an integral and indispensable part of transport protocol design for next generation high bandwidth-delay-product networks. However, a clear definition and through analysis of fairness is still unavailable. In this paper, we argue why and show how starting time can have a significant impact on the fairness of competing high speed TCP flows. Taking starting time as a metric, promising high speed proposals such as highspeed TCP and scalable TCP are investigated in detail by extensive simulation analysis. It is shown in the paper that, under certain conditions on the starting time, scalable TCP can starve other competing flows, either they are highspeed TCP (inter-protocol) or they are scalable TCP (intra-protocol). By detail analytical and statistical analysis, explanation and computation of characteristic parameters are also provided.
{"title":"Benchmarking High Speed TCP Fairness: Why and How Starting Time Matters","authors":"Trinh Anh Tuan","doi":"10.1109/CCE.2006.350839","DOIUrl":"https://doi.org/10.1109/CCE.2006.350839","url":null,"abstract":"Fairness of competing TCP flows is an integral and indispensable part of transport protocol design for next generation high bandwidth-delay-product networks. However, a clear definition and through analysis of fairness is still unavailable. In this paper, we argue why and show how starting time can have a significant impact on the fairness of competing high speed TCP flows. Taking starting time as a metric, promising high speed proposals such as highspeed TCP and scalable TCP are investigated in detail by extensive simulation analysis. It is shown in the paper that, under certain conditions on the starting time, scalable TCP can starve other competing flows, either they are highspeed TCP (inter-protocol) or they are scalable TCP (intra-protocol). By detail analytical and statistical analysis, explanation and computation of characteristic parameters are also provided.","PeriodicalId":148533,"journal":{"name":"2006 First International Conference on Communications and Electronics","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128112774","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}
Bit-interleaved coded modulation with iterative decoding (BICM-ID) and orthogonal frequency-division multiplexing (OFDM) have recently been considered separately to improve the error performance and/or spectral efficiency of communication systems disturbed by impulsive noise. Given the advantages of these two techniques, this paper proposes a novel combination of them in one system. The key feature of the proposed system, termed BI-COFDM-ID, is the iterative processing at the receiver where information exchange is carried out between the OFDM demodulator and the channel decoder. Results show that BI-COFDM-ID outperforms all the previously-proposed techniques at high signal-to-noise ratio (SNR) region and therefore it is attractive for applications that require high spectral efficiency and low bit error rate (BER).
{"title":"An Iterative Receiver for Bit-Interleaved Coded OFDM in Impulsive Noise","authors":"T. Q. Bui, H. Nguyen","doi":"10.1109/CCE.2006.350806","DOIUrl":"https://doi.org/10.1109/CCE.2006.350806","url":null,"abstract":"Bit-interleaved coded modulation with iterative decoding (BICM-ID) and orthogonal frequency-division multiplexing (OFDM) have recently been considered separately to improve the error performance and/or spectral efficiency of communication systems disturbed by impulsive noise. Given the advantages of these two techniques, this paper proposes a novel combination of them in one system. The key feature of the proposed system, termed BI-COFDM-ID, is the iterative processing at the receiver where information exchange is carried out between the OFDM demodulator and the channel decoder. Results show that BI-COFDM-ID outperforms all the previously-proposed techniques at high signal-to-noise ratio (SNR) region and therefore it is attractive for applications that require high spectral efficiency and low bit error rate (BER).","PeriodicalId":148533,"journal":{"name":"2006 First International Conference on Communications and Electronics","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114588505","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}
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