We propose a subcarrier allocation scheme for orthogonal frequency division multiple access (OFDMA) system to provide efficient resource allocation mechanism among multiple users by considering traffic based priority to improve the total system bit error rate (BER) and throughput performances in the multipath fading channel. Since most subcarrier allocation schemes allocate subcarriers in better channel condition for users with different amount of traffic equally, total BER performance is degraded while users with less traffic are assigned with subcarriers in good channel gain. In the proposed scheme, by considering user traffic, better subcarriers are allocated for users with more transmit/receive packets. Our simulation results show that the proposed scheme can provide better system BER and throughput performances compared to the conventional scheme.
{"title":"OFDMA Subcarrier Allocation Scheme by Considering Traffic Based User's Priority","authors":"T. Hasegawa, Rui Zhou, I. Sasase, T. Shono","doi":"10.1109/CCE.2006.350822","DOIUrl":"https://doi.org/10.1109/CCE.2006.350822","url":null,"abstract":"We propose a subcarrier allocation scheme for orthogonal frequency division multiple access (OFDMA) system to provide efficient resource allocation mechanism among multiple users by considering traffic based priority to improve the total system bit error rate (BER) and throughput performances in the multipath fading channel. Since most subcarrier allocation schemes allocate subcarriers in better channel condition for users with different amount of traffic equally, total BER performance is degraded while users with less traffic are assigned with subcarriers in good channel gain. In the proposed scheme, by considering user traffic, better subcarriers are allocated for users with more transmit/receive packets. Our simulation results show that the proposed scheme can provide better system BER and throughput performances compared to the conventional scheme.","PeriodicalId":148533,"journal":{"name":"2006 First International Conference on Communications and Electronics","volume":"39 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":"123856749","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}
The paper presents the simulation in VPI of all-optical routing based on the pulse-position modulation header processing (PPM-HP) scheme in an ultrafast photonic packet switched core network. In this network, optical core router employing PPM-HP utilizes a dedicated multi-wavelength pulse-position routing table (MW-PPRT) which results in a significant reduction of the number of routing table entries thus reducing the header processing time compared to the existing sequential routing table looking-up schemes. The reduced routing table also offers embedding multiple transmitting modes (unicast, multicast and broadcast) in an optical layer and improves scalability of the core network where the number of core/edge nodes could be altered without changing the number of routing table entries. Details of simulation schematics and results of the router operating at 100 Gbit/s are presented.
{"title":"Simulation of All-Optical Routing Employing PPM-based Header Processing in Photonic Packet Switched Core Network","authors":"H. L. Minh, Zabih Ghassemlooy, W. P. Ng","doi":"10.1109/CCE.2006.350855","DOIUrl":"https://doi.org/10.1109/CCE.2006.350855","url":null,"abstract":"The paper presents the simulation in VPI of all-optical routing based on the pulse-position modulation header processing (PPM-HP) scheme in an ultrafast photonic packet switched core network. In this network, optical core router employing PPM-HP utilizes a dedicated multi-wavelength pulse-position routing table (MW-PPRT) which results in a significant reduction of the number of routing table entries thus reducing the header processing time compared to the existing sequential routing table looking-up schemes. The reduced routing table also offers embedding multiple transmitting modes (unicast, multicast and broadcast) in an optical layer and improves scalability of the core network where the number of core/edge nodes could be altered without changing the number of routing table entries. Details of simulation schematics and results of the router operating at 100 Gbit/s are presented.","PeriodicalId":148533,"journal":{"name":"2006 First International Conference on Communications and Electronics","volume":"78 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":"122631847","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}
Practical communication systems require coding rates to be compatible. This report presents a new method to design rate-compatible low-density parity-check (LDPC) codes. The method is based on linear transformation and different from the existing methods. Decomposing rows of the parity-check matrices can produce the parity-check matrices for lower rates. It can also maintain low error floors for the codes at all rates, and the codes can be decoded conveniently and efficiently. It can achieve high throughput in HARQ with FEC system.
{"title":"Generation of Rate-Compatible LDPC Codes Based on Linear Transformation","authors":"Ningxia Chen, Yongyu Chang, Dacheng Yang","doi":"10.1109/CCE.2006.350816","DOIUrl":"https://doi.org/10.1109/CCE.2006.350816","url":null,"abstract":"Practical communication systems require coding rates to be compatible. This report presents a new method to design rate-compatible low-density parity-check (LDPC) codes. The method is based on linear transformation and different from the existing methods. Decomposing rows of the parity-check matrices can produce the parity-check matrices for lower rates. It can also maintain low error floors for the codes at all rates, and the codes can be decoded conveniently and efficiently. It can achieve high throughput in HARQ with FEC system.","PeriodicalId":148533,"journal":{"name":"2006 First International Conference on Communications and Electronics","volume":"37 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":"129996343","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}
Network-on-chip is alternative paradigm to improve communication bandwidth compared to bus-based communication, and its performance largely depends on architecture of router. In this paper, multiplane virtual-channel router which has multiple crossbar switches and modified switch allocator is proposed to enhance the latency and throughput performance. Theoretically, we show this multiplane router has much better latency performance compare to single plane router. Also, we carry out the RTL simulation in order to show that the multiplane router with small number of virtual-channels offering smaller hardware complexity than single plane router with large number of virtual-channels.
{"title":"Multiplane Virtual Channel Router for Network-on-Chip Design","authors":"S. Noh, Vu-Duc Ngo, Hai-Ping Jao, Hae-Wook Choi","doi":"10.1109/CCE.2006.350796","DOIUrl":"https://doi.org/10.1109/CCE.2006.350796","url":null,"abstract":"Network-on-chip is alternative paradigm to improve communication bandwidth compared to bus-based communication, and its performance largely depends on architecture of router. In this paper, multiplane virtual-channel router which has multiple crossbar switches and modified switch allocator is proposed to enhance the latency and throughput performance. Theoretically, we show this multiplane router has much better latency performance compare to single plane router. Also, we carry out the RTL simulation in order to show that the multiplane router with small number of virtual-channels offering smaller hardware complexity than single plane router with large number of virtual-channels.","PeriodicalId":148533,"journal":{"name":"2006 First International Conference on Communications and Electronics","volume":"59 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":"117039499","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}
P. Pirinoli, A. Freni, P. De Vita, F. Vipiana, G. Vecchi
In this paper, we present an efficient, physics-based preconditioning scheme for fast method-of-moments (MoM) methods for the analysis of geometrically complex planar arrays. The preconditioner derives from the generation of a multi-resolution (MR) basis and, unlike other preconditioners, requires a low memory occupation and computational cost for its generation and application. This feature makes the proposed preconditioner suitable for its use with fast integral techniques, as FMM and AIM, that present low computational complexity.
{"title":"Efficient analysis of geometrically complex planar arrays","authors":"P. Pirinoli, A. Freni, P. De Vita, F. Vipiana, G. Vecchi","doi":"10.1109/CCE.2006.350868","DOIUrl":"https://doi.org/10.1109/CCE.2006.350868","url":null,"abstract":"In this paper, we present an efficient, physics-based preconditioning scheme for fast method-of-moments (MoM) methods for the analysis of geometrically complex planar arrays. The preconditioner derives from the generation of a multi-resolution (MR) basis and, unlike other preconditioners, requires a low memory occupation and computational cost for its generation and application. This feature makes the proposed preconditioner suitable for its use with fast integral techniques, as FMM and AIM, that present low computational complexity.","PeriodicalId":148533,"journal":{"name":"2006 First International Conference on Communications and Electronics","volume":"20 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":"121782906","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 a new scheme to support voice calls over a wireless multichannel MAC protocol (VMcMAC). We increase the voice capacity of wireless networks by reducing protocol overhead and interference between voice traffic and data traffic. Voice calls are allocated to specific reserved channels in a distributed TDMA fashion. Each voice node visits the voice channel with a fixed frequency and then transmits a voice frame without sending control messages. With this scheme, we exploit multichannel nature of 802.11 standards to significantly reduce the protocol overhead and avoid most of the interference between voice and data traffic. Our simulation results show a significant improvement in the voice capacity of wireless Ad-hoc networks.
{"title":"A new scheme to support voice call over wireless multi-channel MAC protocol","authors":"T. Trung, Jeonghoon Mo","doi":"10.1109/CCE.2006.350834","DOIUrl":"https://doi.org/10.1109/CCE.2006.350834","url":null,"abstract":"This paper presents a new scheme to support voice calls over a wireless multichannel MAC protocol (VMcMAC). We increase the voice capacity of wireless networks by reducing protocol overhead and interference between voice traffic and data traffic. Voice calls are allocated to specific reserved channels in a distributed TDMA fashion. Each voice node visits the voice channel with a fixed frequency and then transmits a voice frame without sending control messages. With this scheme, we exploit multichannel nature of 802.11 standards to significantly reduce the protocol overhead and avoid most of the interference between voice and data traffic. Our simulation results show a significant improvement in the voice capacity of wireless Ad-hoc networks.","PeriodicalId":148533,"journal":{"name":"2006 First International Conference on Communications and Electronics","volume":"47 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":"122977997","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}
Tuan Phung-Duc, H. Masuyama, S. Kasahara, Y. Takahashi
This paper considers the performance of burst segmentation with upper-layer retransmission for optical burst switched (OBS) networks. Focusing on an output wavelength of an OBS node, we model the system as a single-server queueing system without waiting room. An existing burst in transmission is segmented upon other burst arrival, and the segmented part of the burst is retransmitted after a later time. We derive the wavelength utilization and mean output burst size by a continuous-time Markov chain. Numerical examples show that a small retransmission interval achieves high wavelength utilization but the resulting output burst is small.
{"title":"Burst Segmentation with Upper-Layer Retransmission and Its Effect on Wavelength Utilization for Optical Burst Switched Networks","authors":"Tuan Phung-Duc, H. Masuyama, S. Kasahara, Y. Takahashi","doi":"10.1109/CCE.2006.350840","DOIUrl":"https://doi.org/10.1109/CCE.2006.350840","url":null,"abstract":"This paper considers the performance of burst segmentation with upper-layer retransmission for optical burst switched (OBS) networks. Focusing on an output wavelength of an OBS node, we model the system as a single-server queueing system without waiting room. An existing burst in transmission is segmented upon other burst arrival, and the segmented part of the burst is retransmitted after a later time. We derive the wavelength utilization and mean output burst size by a continuous-time Markov chain. Numerical examples show that a small retransmission interval achieves high wavelength utilization but the resulting output burst is small.","PeriodicalId":148533,"journal":{"name":"2006 First International Conference on Communications and Electronics","volume":"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":"127023134","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}
Mun-Kyo Lee, Jung‐Dong Park, D. An, Bok-Hyung Lee, Sungchan Kim, B. Lim, Sang-Jin Lee, Y. Chae, Wan-Joo Kim, Yong-Hoh Kim, J. Rhee
In this paper, we report our recent research works on the W-band waveguide-to-CPW transitions for various MIMIC applications. For this, the transitions operating in a frequency range of 85 ~ 100 GHz are designed, fabricated and characterized. The designed waveguide-to-CPW transition is optimized to achieve low loss by using an EM field solver of HFSS. From the measurement, an insertion of -2.2 dB and a return loss of -23.86 dB, respectively, were obtained at 94 GHz. The average insertion loss of waveguide-to-CPW back-to-back transition is -2.5 dB in a frequency range of 85 ~ 100 GHz.
{"title":"W-band Waveguide-to-Coplanar Waveguide Transition for 94 GHz MIMIC applications","authors":"Mun-Kyo Lee, Jung‐Dong Park, D. An, Bok-Hyung Lee, Sungchan Kim, B. Lim, Sang-Jin Lee, Y. Chae, Wan-Joo Kim, Yong-Hoh Kim, J. Rhee","doi":"10.1109/CCE.2006.350880","DOIUrl":"https://doi.org/10.1109/CCE.2006.350880","url":null,"abstract":"In this paper, we report our recent research works on the W-band waveguide-to-CPW transitions for various MIMIC applications. For this, the transitions operating in a frequency range of 85 ~ 100 GHz are designed, fabricated and characterized. The designed waveguide-to-CPW transition is optimized to achieve low loss by using an EM field solver of HFSS. From the measurement, an insertion of -2.2 dB and a return loss of -23.86 dB, respectively, were obtained at 94 GHz. The average insertion loss of waveguide-to-CPW back-to-back transition is -2.5 dB in a frequency range of 85 ~ 100 GHz.","PeriodicalId":148533,"journal":{"name":"2006 First International Conference on Communications and Electronics","volume":"48 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":"131742544","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}
B. Eom, Changho Han, H. Kim, M. Yum, Ji-Hun Yang, C. Park, K. Chun
Carbon nanotubes (CNTs) is one of the most attractive materials for field emission tip. Because of its low threshold voltage and high current density. In this article we introduce a new simple process to fabricate self-aligned carbon nanotubes for field emission tip with simple process. We can make the less than 200nm diameter hole with our one mask like process by which carbon nanotubes will be self-aligned with the gate layer. And then carbon nanotubes will be catalytically grown in PECVD chamber.
{"title":"Self-Aligned Carbon Nanotubes for Field Emission Tip with Simple Process","authors":"B. Eom, Changho Han, H. Kim, M. Yum, Ji-Hun Yang, C. Park, K. Chun","doi":"10.1109/CCE.2006.350878","DOIUrl":"https://doi.org/10.1109/CCE.2006.350878","url":null,"abstract":"Carbon nanotubes (CNTs) is one of the most attractive materials for field emission tip. Because of its low threshold voltage and high current density. In this article we introduce a new simple process to fabricate self-aligned carbon nanotubes for field emission tip with simple process. We can make the less than 200nm diameter hole with our one mask like process by which carbon nanotubes will be self-aligned with the gate layer. And then carbon nanotubes will be catalytically grown in PECVD chamber.","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":"133117615","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 this paper, we present a soft computing model for tax fraud detection in small firms and businesses. Inputs to the model are periodical finance reports and related information about market and inspection firms, and outputs are an inference of the tax fraud status. First, after using fuzzy inferences, the system determines a close business class to which the inspected firms belong. Next, training by statistical data from the business class, neural network (NN) is used to determine the fraud status of the inspected firm. Training data for the NN is periodical finance reports, market information of the business class and fraud history of the inspected firms. Finally, we describe initial evaluations and our future works.
{"title":"Application of Soft Computing to Tax Fraud Detection in Small Businesses","authors":"C. Thang, P. Q. Toan, E. Cooper, K. Kamei","doi":"10.1109/CCE.2006.350887","DOIUrl":"https://doi.org/10.1109/CCE.2006.350887","url":null,"abstract":"In this paper, we present a soft computing model for tax fraud detection in small firms and businesses. Inputs to the model are periodical finance reports and related information about market and inspection firms, and outputs are an inference of the tax fraud status. First, after using fuzzy inferences, the system determines a close business class to which the inspected firms belong. Next, training by statistical data from the business class, neural network (NN) is used to determine the fraud status of the inspected firm. Training data for the NN is periodical finance reports, market information of the business class and fraud history of the inspected firms. Finally, we describe initial evaluations and our future works.","PeriodicalId":148533,"journal":{"name":"2006 First International Conference on Communications and Electronics","volume":"73 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":"131048041","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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