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Proceedings of ICCS '94最新文献

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Performance comparison between the MSBN and the GSM systems in a geo satellite environment MSBN与GSM系统在地球卫星环境下的性能比较
Proceedings of ICCS '94 Pub Date : 1994-11-14 DOI: 10.1109/ICCS.1994.474217
F. Delli Priscoli, F. Muratore
{"title":"Performance comparison between the MSBN and the GSM systems in a geo satellite environment","authors":"F. Delli Priscoli, F. Muratore","doi":"10.1109/ICCS.1994.474217","DOIUrl":"https://doi.org/10.1109/ICCS.1994.474217","url":null,"abstract":"One of the most presently debated issues in satellite communications concerns the performance comparison between time division multiple access (TDMA) and code division multiple access (CDMA) systems. Although, in the authors' view, a general answer to this problem can not be found, this paper presents performance comparisons of two systems utilizing the above-mentioned access techniques. In particular, the Mobile Satellite Business Network (MSBN), (a CDMA system currently being developed by the European Space Agency (ESA) ad hoc for satellite applications) and the full integrated extension to satellite systems of the Global System for Mobile Communication (GSM) (the well-known pan-European mobile cellular system) are compared by taking as reference payload the European Mobile Satellite (EMS) (a geostationary satellite to be launched in the near future). The performance comparisons are carried out in terms of link feasibility and number of available channels for the same quality requirements and emitted power levels, in the same propagation environments and for the same interference levels coming from adjacent satellites.<<ETX>>","PeriodicalId":158681,"journal":{"name":"Proceedings of ICCS '94","volume":"88 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131891907","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
Inter-networking security 网际网路安全
Proceedings of ICCS '94 Pub Date : 1994-11-14 DOI: 10.1109/ICCS.1994.474289
G.W. Wang
{"title":"Inter-networking security","authors":"G.W. Wang","doi":"10.1109/ICCS.1994.474289","DOIUrl":"https://doi.org/10.1109/ICCS.1994.474289","url":null,"abstract":"Inter-networking security in a multi-vendor heterogeneous network environment is a critical problem for IT professionals. This paper analyzes the security threats in a multi-vendor network environment and proposes a network security architecture for building a secure distributed network. It also discusses various information security packages including crypto-systems, network authentication, and security control software. The paper attempts to provide readers a systematic way for securing inter-network environment.<<ETX>>","PeriodicalId":158681,"journal":{"name":"Proceedings of ICCS '94","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128299270","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: 2
Analysis of electromagnetic scattering by a rotating rotor with flat blades 平叶片旋转转子的电磁散射分析
Proceedings of ICCS '94 Pub Date : 1994-11-14 DOI: 10.1109/ICCS.1994.474244
Young-Seek Sun, N. Myung
{"title":"Analysis of electromagnetic scattering by a rotating rotor with flat blades","authors":"Young-Seek Sun, N. Myung","doi":"10.1109/ICCS.1994.474244","DOIUrl":"https://doi.org/10.1109/ICCS.1994.474244","url":null,"abstract":"The problem of amplitude and frequency modulated waveforms of an electromagnetic wave due to the scattering by a slowly rotating rotor with metal plate(s) is investigated in this study. Equivalent current method (ECM) together with geometrical theory of diffraction (GTD) is used to analyze the modulated waveforms. The modulated waveforms depend on the orientation and dimension of the object, its rotation speed, and very strongly on the incident and scattering directions. Numerical results based on our ECM are presented and compared with those of Sikta's (1983) and physical optics (PO) solution.<<ETX>>","PeriodicalId":158681,"journal":{"name":"Proceedings of ICCS '94","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130539077","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: 7
Optimal bandwidth expansion for DS/SSMA communication over a multipath Rayleigh fading channel 多径瑞利衰落信道上DS/SSMA通信的最优带宽扩展
Proceedings of ICCS '94 Pub Date : 1994-11-14 DOI: 10.1109/ICCS.1994.474179
Sung Hyun Choi, S. Kim
{"title":"Optimal bandwidth expansion for DS/SSMA communication over a multipath Rayleigh fading channel","authors":"Sung Hyun Choi, S. Kim","doi":"10.1109/ICCS.1994.474179","DOIUrl":"https://doi.org/10.1109/ICCS.1994.474179","url":null,"abstract":"We consider a convolutionally coded asynchronous direct-sequence spread-spectrum multiple access (DS/SSMA) communication system employing an ideal RAKE receiver over a multipath Rayleigh fading channel. Both spread spectrum and channel coding have the effect of mitigating the multiuser interference and expanding the channel bandwidth. The optimum bandwidth expansion in maximizing the normalised throughput is investigated in connection with the number of users and the decoder complexity. The required channel bandwidth reduction via soft decision decoding is also examined.<<ETX>>","PeriodicalId":158681,"journal":{"name":"Proceedings of ICCS '94","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130693218","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: 2
Modelling and testing of symmetrical n-port planar power dividers 对称n口平面功率分配器的建模与测试
Proceedings of ICCS '94 Pub Date : 1994-11-14 DOI: 10.1109/ICCS.1994.474070
L. Tan, S. Yeo
{"title":"Modelling and testing of symmetrical n-port planar power dividers","authors":"L. Tan, S. Yeo","doi":"10.1109/ICCS.1994.474070","DOIUrl":"https://doi.org/10.1109/ICCS.1994.474070","url":null,"abstract":"Adopting a unified approach, the symmetrical microstrip ring coupler was analyzed using a first-order eigenmode method. Several prototypes, ranging from 2- to 8-ports, were subsequently developed to test the validity of the model. The design of an optimum broadband 4-port power divider was also undertaken, followed by a qualitative investigation into the effects of coupler dimension variations on its performance.<<ETX>>","PeriodicalId":158681,"journal":{"name":"Proceedings of ICCS '94","volume":"251 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132906991","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
Moments of the queue occupancy in an ATM multiplexer loaded with on/off sources 加载了开/关源的ATM多路复用器中队列占用的时刻
Proceedings of ICCS '94 Pub Date : 1994-11-14 DOI: 10.1109/ICCS.1994.474163
R. Slosiar
{"title":"Moments of the queue occupancy in an ATM multiplexer loaded with on/off sources","authors":"R. Slosiar","doi":"10.1109/ICCS.1994.474163","DOIUrl":"https://doi.org/10.1109/ICCS.1994.474163","url":null,"abstract":"Matrix-analytic techniques based on the discrete-time batch Markovian arrival process (D-BMAP) modeling have been applied to the analysis of ATM multiplexers under correlated input conditions. The former results yield the multiplexer system queue occupancy using the D-BMAP/D/1 queueing system, where the aggregate of a set of homogeneous on/off sources have been modeled as a single D-BMAP. The multiplexer performance is analyzed using the first two moments of the queue distribution, which have a direct impact on the cell end-to-end delay and its variation. We express the functional equation of an infinite-capacity queueing system loaded by a set of homogeneous on/off sources and derive the first two moments of the number of cells in the system. We highlight the relationships between the source parameters, the moments and the boundary probabilities involved.<<ETX>>","PeriodicalId":158681,"journal":{"name":"Proceedings of ICCS '94","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134381393","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: 2
A low delay speech coding system at 4.8 kb/s 4.8 kb/s的低延迟语音编码系统
Proceedings of ICCS '94 Pub Date : 1994-11-14 DOI: 10.1109/ICCS.1994.474279
Jian Zhang, Hong Shen Wang
{"title":"A low delay speech coding system at 4.8 kb/s","authors":"Jian Zhang, Hong Shen Wang","doi":"10.1109/ICCS.1994.474279","DOIUrl":"https://doi.org/10.1109/ICCS.1994.474279","url":null,"abstract":"Low-delay speech coding has drawn much attention because of its many potential applications. A lot of low delay speech coders have been proposed in the past few years. But almost all of them focus on the speech bit rate between 8 kb/s to 16 kb/s. The authors present a low delay speech coder operating at 4.8 kb/s which provides good speech quality with a coding delay only about 2.5 msec. This new low delay coder uses backward LPC analysis to remove the short-term correlation from speech and adopts a new approach to predict the long term prediction (LTP) coefficients based on a \"dual-decision\" scheme. At the excitation part, the authors exploit a new excitaton model which contains a sinusoid signal codebook and a stochastic codebook to excite the whole speech system. The synthesized speech of this coder has comparable quality to that of FS-1016 CELP coder while having a delay constraint more than an order of magnitude smaller than that of the FS-1016 coder.<<ETX>>","PeriodicalId":158681,"journal":{"name":"Proceedings of ICCS '94","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133650222","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
Spread-slotted ALOHA throughput in nonuniform traffic situation for LEO satellite communication systems 低轨道卫星通信系统非均匀通信量情况下的扩展槽ALOHA吞吐量
Proceedings of ICCS '94 Pub Date : 1994-11-14 DOI: 10.1109/ICCS.1994.474191
A. Jamalipour, M. Katayama, T. Yamazato, A. Ogawa
{"title":"Spread-slotted ALOHA throughput in nonuniform traffic situation for LEO satellite communication systems","authors":"A. Jamalipour, M. Katayama, T. Yamazato, A. Ogawa","doi":"10.1109/ICCS.1994.474191","DOIUrl":"https://doi.org/10.1109/ICCS.1994.474191","url":null,"abstract":"An analytical framework to study the nonuniformity in geographical distribution of the traffic load in low Earth-orbital satellite communication systems is presented. In these systems, because of their small coverage area compared with conventional geostationary satellites, the nonuniformity of the traffic affects the performance of the system considerably. The throughput characteristics of a system with direct-sequence packet spread-slotted ALOHA multiple-access technique are evaluated and it is shown that that the traffic nonuniformity makes the characteristics of the system significantly different from the results of the uniform traffic case and that the performance of each user varies according to the location. Moreover, the interference from the users of adjacent satellites is shown to be one of the main factors that limits the performance of system.<<ETX>>","PeriodicalId":158681,"journal":{"name":"Proceedings of ICCS '94","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132297099","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
Performance evaluation of BPSK receiver in the presence of intersymbol interference and slowly fading channels 码间干扰和慢衰落信道下BPSK接收机性能评价
Proceedings of ICCS '94 Pub Date : 1994-11-14 DOI: 10.1109/ICCS.1994.474147
T.M. Nguyen, R. Kumar, H. Yeh
{"title":"Performance evaluation of BPSK receiver in the presence of intersymbol interference and slowly fading channels","authors":"T.M. Nguyen, R. Kumar, H. Yeh","doi":"10.1109/ICCS.1994.474147","DOIUrl":"https://doi.org/10.1109/ICCS.1994.474147","url":null,"abstract":"This paper analyzes the performance of BPSK in the presence of intersymbol interference (ISI), slowly fading channel and additive white gaussian noise (AWGN). Only coherent detection of BPSK signal is considered. It is shown that the bit error rate (BER) performance in the presence of ISI, slowly fading channel and AWGN can be calculated by using series expression for the characteristic function of the sufficient statistic. Furthermore, it is also shown that the BER performance can be approximated using numerical quadrature of a Laplace inversion integral along a contour in the complex plane passing through a saddlepoint of the integrand.<<ETX>>","PeriodicalId":158681,"journal":{"name":"Proceedings of ICCS '94","volume":"451 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132055402","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
Design of adaptive mesh routing chip 自适应网格路由芯片的设计
Proceedings of ICCS '94 Pub Date : 1994-11-14 DOI: 10.1109/ICCS.1994.474248
Jun-Woo Kang
{"title":"Design of adaptive mesh routing chip","authors":"Jun-Woo Kang","doi":"10.1109/ICCS.1994.474248","DOIUrl":"https://doi.org/10.1109/ICCS.1994.474248","url":null,"abstract":"Design of an adaptive router chip with minimum possible delay is described. The designed router is for message passing between computers which are connected in 2D mesh topology. The implemented algorithm is the negative-first adaptive wormhole routing algorithm which is deadlock free, livelock free, minimal, and maximally adaptive. The functional blocks of the router and asynchronous interfaces between routers were verified with VHDL modeling and simulation. Future enhancements for dynamic fault handling features are discussed.<<ETX>>","PeriodicalId":158681,"journal":{"name":"Proceedings of ICCS '94","volume":"199 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132362458","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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