W. Colitti, K. Steenhaut, A. Nowé, E.E. Monreal, L. Tran
The number of IP based services concurrently transmitted over the Internet is incessantly increasing, causing IP layer QoS control mechanisms to be unable to satisfy the service level agreements (SLAs). Besides providing a huge amount of transmission capacity, optical networks should also cooperate with the IP layer in differentiating the provided grade of QoS according to the different traffic types requirements. The cooperation is facilitated by the development of generalized multi protocol label switching (GMPLS) in both optical and IP networking that is bringing the two domains close together. The result is an integrated network using a unique traffic engineering database (TED) and where a node has complete knowledge of both physical and logical topology. This paper proposes a multilayer QoS framework for such networks. The scheme differentiates traffic also when being transmitted over the optical layer. Three classes of service (CoSs) are defined and each one is served following a different routing policy, in order to provide different CoS with different grades of QoS. The simulation results show that without a significant penalization in terms of blocking probability, the QoS sensitive traffic undergoes a shorter delay and lower values of optical-electronic-optical (O-E-O) signal conversion.
{"title":"Multilayer QoS in integrated IP over Optical Networks","authors":"W. Colitti, K. Steenhaut, A. Nowé, E.E. Monreal, L. Tran","doi":"10.1109/CCE.2006.350849","DOIUrl":"https://doi.org/10.1109/CCE.2006.350849","url":null,"abstract":"The number of IP based services concurrently transmitted over the Internet is incessantly increasing, causing IP layer QoS control mechanisms to be unable to satisfy the service level agreements (SLAs). Besides providing a huge amount of transmission capacity, optical networks should also cooperate with the IP layer in differentiating the provided grade of QoS according to the different traffic types requirements. The cooperation is facilitated by the development of generalized multi protocol label switching (GMPLS) in both optical and IP networking that is bringing the two domains close together. The result is an integrated network using a unique traffic engineering database (TED) and where a node has complete knowledge of both physical and logical topology. This paper proposes a multilayer QoS framework for such networks. The scheme differentiates traffic also when being transmitted over the optical layer. Three classes of service (CoSs) are defined and each one is served following a different routing policy, in order to provide different CoS with different grades of QoS. The simulation results show that without a significant penalization in terms of blocking probability, the QoS sensitive traffic undergoes a shorter delay and lower values of optical-electronic-optical (O-E-O) signal conversion.","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":"121718256","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 presents the research and development process of an integrated multimedia conference system named "BK Meeting Anywhere-BKMA" and related issues. The system seamlessly integrate Internet multimedia and telephony network for both real-time and non real-time communications. One of the most important features of the system is the successfulness of utilizing popular low-cost hardware to form a complex, feature-rich and flexible communication systems. Several issues such as technology, software design and implementation, system integration, measurement, are to be discussed in the next sections.
{"title":"Research and Development of an integrated multimedia conferencing system","authors":"H. N. Chan","doi":"10.1109/CCE.2006.350890","DOIUrl":"https://doi.org/10.1109/CCE.2006.350890","url":null,"abstract":"This paper presents the research and development process of an integrated multimedia conference system named \"BK Meeting Anywhere-BKMA\" and related issues. The system seamlessly integrate Internet multimedia and telephony network for both real-time and non real-time communications. One of the most important features of the system is the successfulness of utilizing popular low-cost hardware to form a complex, feature-rich and flexible communication systems. Several issues such as technology, software design and implementation, system integration, measurement, are to be discussed in the next sections.","PeriodicalId":148533,"journal":{"name":"2006 First International Conference on Communications and Electronics","volume":"271 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":"123116955","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}
V. Y. Vu, A. Judson Braga, B. Huyart, X. Begaud, Nguyen Bich Huyen
The five-port wave correlator in microstrip technology consists of a ring with 5 arms and three diode power detectors. The ratio of two waves (radio frequency and local oscillator) is determined as a linear combination of the power levels measured at the five -port's outputs. The advantages of using five-port are its low-cost, its less sensibility to phase and amplitude imbalances and its operation in a wide frequency band. We present in this paper a system based on five-port wave correlators, which measure the detection of arrival (DOA) in azimuth and in elevation plan of radio frequency signals. The parallel receivers operating at 2.4 GHz consist of 8 five-ports and a planar antenna array of 8 quasi-Yagi antenna elements. The DOA is estimated by measuring the phase difference of the signals picked up by the elements in the array and by using the MUSIC (multiple signal classification) algorithm. The phase difference is determined using the five-port technique. The simulation and measurement results show that the signals are accurately estimated with one error of 2deg.
{"title":"Elevation/Azimuth Propagation Angle Measurements Using Five-Port Wave Correlators","authors":"V. Y. Vu, A. Judson Braga, B. Huyart, X. Begaud, Nguyen Bich Huyen","doi":"10.1109/CCE.2006.350870","DOIUrl":"https://doi.org/10.1109/CCE.2006.350870","url":null,"abstract":"The five-port wave correlator in microstrip technology consists of a ring with 5 arms and three diode power detectors. The ratio of two waves (radio frequency and local oscillator) is determined as a linear combination of the power levels measured at the five -port's outputs. The advantages of using five-port are its low-cost, its less sensibility to phase and amplitude imbalances and its operation in a wide frequency band. We present in this paper a system based on five-port wave correlators, which measure the detection of arrival (DOA) in azimuth and in elevation plan of radio frequency signals. The parallel receivers operating at 2.4 GHz consist of 8 five-ports and a planar antenna array of 8 quasi-Yagi antenna elements. The DOA is estimated by measuring the phase difference of the signals picked up by the elements in the array and by using the MUSIC (multiple signal classification) algorithm. The phase difference is determined using the five-port technique. The simulation and measurement results show that the signals are accurately estimated with one error of 2deg.","PeriodicalId":148533,"journal":{"name":"2006 First International Conference on Communications and Electronics","volume":"43 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":"132968278","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 far field RFID systems, tag collision resolution is significantly important for fast tag identification. In this paper, we propose an accurate tag estimation method and an effective tag anti-collision protocol. Performance evaluation that the proposed estimation and anti-collision algorithm consumes 10-15% less time slots than the binary tree protocol and DFSA. The proposed algorithm has the tolerance to inaccuracy of tag estimation.
{"title":"Identification of RFID Tags in Framed-Slotted ALOHA with Tag Estimation and Binary Splitting","authors":"Jongho Park, M. Chung, Tae-Jin Lee","doi":"10.1109/CCE.2006.350795","DOIUrl":"https://doi.org/10.1109/CCE.2006.350795","url":null,"abstract":"In far field RFID systems, tag collision resolution is significantly important for fast tag identification. In this paper, we propose an accurate tag estimation method and an effective tag anti-collision protocol. Performance evaluation that the proposed estimation and anti-collision algorithm consumes 10-15% less time slots than the binary tree protocol and DFSA. The proposed algorithm has the tolerance to inaccuracy of tag estimation.","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":"134246270","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}
Recent years have seen dramatic growth in the realtime traffic generated by the emergence of various real-time applications on the Internet, which typically use the non-congestion-controlled UDP protocol as their transport protocol. This increasing growth of the non-congestion-controlled real-time traffic can easily cause critical issue, congestion collapse, or even prevent the traffic of well mannered congestion-controlled TCP flows. To solve these problems, the datagram congestion control protocol (DCCP) has been proposed. In order to successfully deploy DCCP on the Internet, it is vital to ensure that DCCP is fully compatible with the existing dominant TCP flows. In this paper, we evaluate and propose an algorithm to improve the TCP fairness of DCCP flow control for bursty real-time applications. Through numerous simulation results, we show that our proposed algorithm improves the fairness between TCP and DCCP flows without negative effect on real-time characteristics.
{"title":"TCP Fairness Improvement of DCCP Flow Control for Bursty Real-Time Applications","authors":"Quoc Truong Tong, Hiroyuki Koga, Katuyoshi Jida, Yoshinori Sakai","doi":"10.1109/CCE.2006.350858","DOIUrl":"https://doi.org/10.1109/CCE.2006.350858","url":null,"abstract":"Recent years have seen dramatic growth in the realtime traffic generated by the emergence of various real-time applications on the Internet, which typically use the non-congestion-controlled UDP protocol as their transport protocol. This increasing growth of the non-congestion-controlled real-time traffic can easily cause critical issue, congestion collapse, or even prevent the traffic of well mannered congestion-controlled TCP flows. To solve these problems, the datagram congestion control protocol (DCCP) has been proposed. In order to successfully deploy DCCP on the Internet, it is vital to ensure that DCCP is fully compatible with the existing dominant TCP flows. In this paper, we evaluate and propose an algorithm to improve the TCP fairness of DCCP flow control for bursty real-time applications. Through numerous simulation results, we show that our proposed algorithm improves the fairness between TCP and DCCP flows without negative effect on real-time characteristics.","PeriodicalId":148533,"journal":{"name":"2006 First International Conference on Communications and Electronics","volume":"12 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":"134022798","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 signal processing for high density magnetic recording systems, it is important to combine a signal detection method and an error correction scheme. Error correcting codes for magnetic recording channels are required to be easily implemented and to have high code rates. High dimensional parity check codes with high code rates satisfy these requirements. We show the error correcting performance of the high dimensional parity check codes with high code rates when we apply them to PR channels. We also show that the integrated interleaving ECC technique is useful for a PR channel.
{"title":"Applications of Integrated Interleaving BC scheme and High Dimensional Parity Codes with High Code Rates to PR Channels","authors":"H. Kamabe, T. Kado","doi":"10.1109/CCE.2006.350808","DOIUrl":"https://doi.org/10.1109/CCE.2006.350808","url":null,"abstract":"In signal processing for high density magnetic recording systems, it is important to combine a signal detection method and an error correction scheme. Error correcting codes for magnetic recording channels are required to be easily implemented and to have high code rates. High dimensional parity check codes with high code rates satisfy these requirements. We show the error correcting performance of the high dimensional parity check codes with high code rates when we apply them to PR channels. We also show that the integrated interleaving ECC technique is useful for a PR channel.","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":"131070215","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}
Jin Xiu-feng, Bi Guangguo, Xiao Haiyong, Zhang Peng
Compared with coherent detection, the price of not requiring channel state information (CSI) in a noncoherent UWB receiver is an increase of about 3 dB in the required SNR. In order to overcome the gap, a differential encoding and decoding scheme for multiband UWB systems is proposed in this paper. The proposed scheme employs the parallel concatenation of two differential diagonal space-frequency encoders at the transmitter and performs a simple soft decision iterative decoding at the receiver. Simulation results show that the proposed scheme can outperform the conventional differential and coherent detection at high SNR with few number of iterations.
{"title":"Iterative Decoding of Differential coded Multiband-OFDM UWB Communication Systems","authors":"Jin Xiu-feng, Bi Guangguo, Xiao Haiyong, Zhang Peng","doi":"10.1109/CCE.2006.350818","DOIUrl":"https://doi.org/10.1109/CCE.2006.350818","url":null,"abstract":"Compared with coherent detection, the price of not requiring channel state information (CSI) in a noncoherent UWB receiver is an increase of about 3 dB in the required SNR. In order to overcome the gap, a differential encoding and decoding scheme for multiband UWB systems is proposed in this paper. The proposed scheme employs the parallel concatenation of two differential diagonal space-frequency encoders at the transmitter and performs a simple soft decision iterative decoding at the receiver. Simulation results show that the proposed scheme can outperform the conventional differential and coherent detection at high SNR with few number of iterations.","PeriodicalId":148533,"journal":{"name":"2006 First International Conference on Communications and Electronics","volume":"128 10 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":"117172161","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}
A new chip design era in the coming nano-scale, so called network on chip (NoC), has been introduced based on the demand of the intensive use and seamless integration of many heterogeneous semiconductor intellectual property (IP) blocks in the form of embedded and distributed processors, memories, DSPs, and interfaces. The NoC design, with its own characteristics, very strictly requires the satisfaction of several physical constraints such as the network latency, the used area as well as the power consumption of design. In this paper, we introduce the queuing theory based and power model based of the router in order to analyzes the throughput, size and energy consumption of heterogeneous network on chip architectures. This article also presents the method to automatically map IPs onto the given architectures to obtain the maximum throughput while keep the minimum energy consumption. Some realizations of H.264 decoder on regular NoC architectures such as 2D mesh and fat-tree are simulated. The results show that the network throughput is maximized with the optimized mapping scheme. The energy dissipation consequently calculated and shown that it is very much saved compared to that of random mapping.
{"title":"Realizing Network on Chip Design of H.264 Decoder Based on Throughput Aware Mapping","authors":"Vu-Duc Ngo, H. Nguyen, Hae-Wook Choi","doi":"10.1109/CCE.2006.350797","DOIUrl":"https://doi.org/10.1109/CCE.2006.350797","url":null,"abstract":"A new chip design era in the coming nano-scale, so called network on chip (NoC), has been introduced based on the demand of the intensive use and seamless integration of many heterogeneous semiconductor intellectual property (IP) blocks in the form of embedded and distributed processors, memories, DSPs, and interfaces. The NoC design, with its own characteristics, very strictly requires the satisfaction of several physical constraints such as the network latency, the used area as well as the power consumption of design. In this paper, we introduce the queuing theory based and power model based of the router in order to analyzes the throughput, size and energy consumption of heterogeneous network on chip architectures. This article also presents the method to automatically map IPs onto the given architectures to obtain the maximum throughput while keep the minimum energy consumption. Some realizations of H.264 decoder on regular NoC architectures such as 2D mesh and fat-tree are simulated. The results show that the network throughput is maximized with the optimized mapping scheme. The energy dissipation consequently calculated and shown that it is very much saved compared to that of random mapping.","PeriodicalId":148533,"journal":{"name":"2006 First International Conference on Communications and Electronics","volume":"31 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":"116252160","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}
Dao Nguyen Dung, K. Sakaguchi, S. Suyama, R. Nagareda, J. Takada, H. Suzuki, K. Araki, S. Arata, K. Kaiga, S. Manabe, T. Yamaguchi, K. Miwa
A 4 times 4 MIMO fading simulator (MIMO-FS) was constructed for the development of MIMO products. This MIMO-FS consists of multi-port up/down converters for 2.4/5.2GHz bands and baseband reconfigurable digital signal processors which allows the implementation of various MIMO channel models. In this paper, extended IEEE802.11n channel model including antenna characteristics and its hardware implementation are given as well as the system evaluation results.
{"title":"Implementation and Evaluation of 4×4 MIMO Fading Simulator Considering Antenna Characteristics","authors":"Dao Nguyen Dung, K. Sakaguchi, S. Suyama, R. Nagareda, J. Takada, H. Suzuki, K. Araki, S. Arata, K. Kaiga, S. Manabe, T. Yamaguchi, K. Miwa","doi":"10.1109/CCE.2006.350872","DOIUrl":"https://doi.org/10.1109/CCE.2006.350872","url":null,"abstract":"A 4 times 4 MIMO fading simulator (MIMO-FS) was constructed for the development of MIMO products. This MIMO-FS consists of multi-port up/down converters for 2.4/5.2GHz bands and baseband reconfigurable digital signal processors which allows the implementation of various MIMO channel models. In this paper, extended IEEE802.11n channel model including antenna characteristics and its hardware implementation are given as well as the system evaluation results.","PeriodicalId":148533,"journal":{"name":"2006 First International Conference on Communications and Electronics","volume":"11 5 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":"123871239","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 studies the problem of finding an optimal subcarrier and power allocation for downlink communication in the orthogonal frequency division multiplexing (OFDM) wireless systems. With the constraints on the power consumption and transmission rates for users, the problem of maximizing total throughput is mathematically formulated. The developed mathematical model is so general as to include almost of existing ones in which the original problems have been usually divided into smaller and tractable ones to make a practical application of some simple greedy algorithms. In this study, developed is the subgradient dual optimization method for the problem. Extensive experiments with realistic data show that in a reasonable time the subgradient method converges to the stable point, almost feasible to the original problem. We proved that the subgradient method is applicable to the dynamic resource allocation, by showing that environmental changes at a stable state need much lesser additional iterations to converge.
{"title":"Subgradient Approach for Resource Management in Multiuser OFDM Systems","authors":"Yong-joo Chung, C. Paik, Hu-gon Kim","doi":"10.1109/CCE.2006.350829","DOIUrl":"https://doi.org/10.1109/CCE.2006.350829","url":null,"abstract":"This paper studies the problem of finding an optimal subcarrier and power allocation for downlink communication in the orthogonal frequency division multiplexing (OFDM) wireless systems. With the constraints on the power consumption and transmission rates for users, the problem of maximizing total throughput is mathematically formulated. The developed mathematical model is so general as to include almost of existing ones in which the original problems have been usually divided into smaller and tractable ones to make a practical application of some simple greedy algorithms. In this study, developed is the subgradient dual optimization method for the problem. Extensive experiments with realistic data show that in a reasonable time the subgradient method converges to the stable point, almost feasible to the original problem. We proved that the subgradient method is applicable to the dynamic resource allocation, by showing that environmental changes at a stable state need much lesser additional iterations to converge.","PeriodicalId":148533,"journal":{"name":"2006 First International Conference on Communications and Electronics","volume":"108 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":"131581212","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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