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IEEE International Conference on Communications, - Spanning the Universe.最新文献

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An analytical model for buffer and trunk sizing and severe congestion avoidance in LAPD frame-relay networks LAPD帧中继网络中缓冲和中继大小及严重拥塞避免的分析模型
IEEE International Conference on Communications, - Spanning the Universe. Pub Date : 1988-06-12 DOI: 10.1109/ICC.1988.13547
K. Rege, K.-J. Chen
{"title":"An analytical model for buffer and trunk sizing and severe congestion avoidance in LAPD frame-relay networks","authors":"K. Rege, K.-J. Chen","doi":"10.1109/ICC.1988.13547","DOIUrl":"https://doi.org/10.1109/ICC.1988.13547","url":null,"abstract":"An analytic model is presented to deal with sizing and managing sources so that the severity of congestion can be minimized. This model does not account for packet loss and the consequent retransmission. However, it computes distributions of the number of packets of each type in the trunk buffer and the corresponding memory requirements, which can be used to estimate the probability of packet loss for a given buffer size. The model uses closed queuing analysis with simple approximations to account for the constraints imposed by window flow control. Some results derived from the model are presented and compared with those obtained through simulation. The analytical model can deal with the buffer sizing problem for high-speed trunks which can carry thousands of virtual circuits. It is demonstrated that with proper system sizing and management, network resources can be efficiently utilized.<<ETX>>","PeriodicalId":191242,"journal":{"name":"IEEE International Conference on Communications, - Spanning the Universe.","volume":"157 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115912270","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
Taguchi methods to improve the development process 田口方法改进开发过程
IEEE International Conference on Communications, - Spanning the Universe. Pub Date : 1988-06-12 DOI: 10.1109/ICC.1988.13674
D. Clausing
{"title":"Taguchi methods to improve the development process","authors":"D. Clausing","doi":"10.1109/ICC.1988.13674","DOIUrl":"https://doi.org/10.1109/ICC.1988.13674","url":null,"abstract":"A description is given of the Taguchi methods, which compromise combinations of engineering, statistics, economics, and information theory that greatly improve product development. Product parameter design optimizes the nominal values of design parameters to keep performance near complete customer satisfaction despite variances of parts and environment. Tolerance design selects the basic precision level that minimizes total cost. Process parameter design optimizes process parameters to maximise the intrinsic stability of production. Online quality control periodically checks and adjusts production to maintain operating precision that minimizes total cost.<<ETX>>","PeriodicalId":191242,"journal":{"name":"IEEE International Conference on Communications, - Spanning the Universe.","volume":"287 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114707325","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: 14
Computer controlled hardware simulation of fading channel models 衰落信道模型的计算机控制硬件仿真
IEEE International Conference on Communications, - Spanning the Universe. Pub Date : 1988-06-12 DOI: 10.1109/ICC.1988.13826
R.N. Kolte, S. Kwatra, G. Stevens
{"title":"Computer controlled hardware simulation of fading channel models","authors":"R.N. Kolte, S. Kwatra, G. Stevens","doi":"10.1109/ICC.1988.13826","DOIUrl":"https://doi.org/10.1109/ICC.1988.13826","url":null,"abstract":"Several fading models, including the general fading model, the Rayleigh fading model, and the simple three-path fading model are simulated to study the effect of fading in radio communication links. These models are implemented in hardware using computer control. The effect of fading is demonstrated using speech as the test signal. For the Rayleigh fading model, it is found that, when the automatic gain control (AGC) of the receiver is off, the received signal fades as in real-life transmission. When the AGC is on, the effect of fading is not noticeable most of the times but the noise level goes up when fading occurs, as expected. When the fading is severe, it is found that AGC cannot totally compensate for the fading; this is also expected. Other models are tested in a similar manner and yield expected results.<<ETX>>","PeriodicalId":191242,"journal":{"name":"IEEE International Conference on Communications, - Spanning the Universe.","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114981085","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: 9
Design issues in the development of a national fiber-optic transmission network 国家光纤传输网络建设中的设计问题
IEEE International Conference on Communications, - Spanning the Universe. Pub Date : 1988-06-12 DOI: 10.1109/ICC.1988.13533
Allan Almlie, S. Dyer, D. Habibi, R. Hanke, J. Thielen
{"title":"Design issues in the development of a national fiber-optic transmission network","authors":"Allan Almlie, S. Dyer, D. Habibi, R. Hanke, J. Thielen","doi":"10.1109/ICC.1988.13533","DOIUrl":"https://doi.org/10.1109/ICC.1988.13533","url":null,"abstract":"Development of the first US national fiber-optic transmission network, during a period marked by the rapid and technology-intensive introduction of single-mode cable and high-capacity optical transmission equipment is discussed. The authors examine some of the important design issues addressed during the development phase including baseband treatment, surveillance system homogeneity, capacity upgrade capability, network survivability, and flexibility for future growth.<<ETX>>","PeriodicalId":191242,"journal":{"name":"IEEE International Conference on Communications, - Spanning the Universe.","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117171534","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
DSP type demodulator for both asymmetric and symmetric modulations 用于非对称和对称调制的DSP型解调器
IEEE International Conference on Communications, - Spanning the Universe. Pub Date : 1988-06-12 DOI: 10.1109/ICC.1988.13702
H. Koike, M. Hagiwara, M. Nakagawa
{"title":"DSP type demodulator for both asymmetric and symmetric modulations","authors":"H. Koike, M. Hagiwara, M. Nakagawa","doi":"10.1109/ICC.1988.13702","DOIUrl":"https://doi.org/10.1109/ICC.1988.13702","url":null,"abstract":"The authors modify a digital signal processing (DSP) type digital phase-locked loop (DPLL) with high performance named tan-DPLL (for tangent-type DPLL) to an adaptive version which can extend a noise threshold about 8 dB. Using the adaptive tan-DPLL combined with a phase partition method, they propose a DSP-type demodulator for both asymmetric and symmetric modulations. It is shown by computer simulation that the performance of the proposed demodulator agrees well with the theory.<<ETX>>","PeriodicalId":191242,"journal":{"name":"IEEE International Conference on Communications, - Spanning the Universe.","volume":"420 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117342056","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
256 QAM 400 Mb/s microwave radio system with DSP fading countermeasures 256qam 400mb /s微波无线电系统与DSP衰落对抗
IEEE International Conference on Communications, - Spanning the Universe. Pub Date : 1988-06-12 DOI: 10.1109/ICC.1988.13772
H. Matsue, T. Shirato, K. Watanabe
{"title":"256 QAM 400 Mb/s microwave radio system with DSP fading countermeasures","authors":"H. Matsue, T. Shirato, K. Watanabe","doi":"10.1109/ICC.1988.13772","DOIUrl":"https://doi.org/10.1109/ICC.1988.13772","url":null,"abstract":"A 256 QAM 400 Mb/s system and repeater configuration, using fading countermeasures with digital signal processing (DSP) technologies, is described. A one-chip transversal filter is developed. This large-scale integration chip is used as a fully digital transversal equalizer and a cross-polarization interference canceller offering compactness, low power consumption, and no tuning. An advanced control method called the shift-bit select and the maximum level error method are introduced to improve control response, acquisition and steady performance. The field test confirms good performance of the fading countermeasures with DSP technologies.<<ETX>>","PeriodicalId":191242,"journal":{"name":"IEEE International Conference on Communications, - Spanning the Universe.","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116380074","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: 10
Preliminary results on routing in hybrid link systems 混合链路系统路由研究的初步结果
IEEE International Conference on Communications, - Spanning the Universe. Pub Date : 1988-06-12 DOI: 10.1109/ICC.1988.13804
H. Okazaki, M. Schwartz
{"title":"Preliminary results on routing in hybrid link systems","authors":"H. Okazaki, M. Schwartz","doi":"10.1109/ICC.1988.13804","DOIUrl":"https://doi.org/10.1109/ICC.1988.13804","url":null,"abstract":"Routing problems in integrated networks composed of hybrid-link systems are described. Circuit- and packet-switched traffic, both voice and data, share the network resources using a movable boundary scheme. The problem is to determine how two different kinds of traffic should be routed in a single network. It appears impossible to develop the optimum algorithm which finds the global optimum routes. This is because the objective function adopted, a weighted sum of blocking probability and time delay, is not convex with respect to the flows. Hence, a simple algorithm which can find a good solution is proposed. Using the algorithm, case studies have been carried out to check whether voice and data take the same paths, or whether they have their own set of paths. The numerical results indicate that voice and data should take the same paths to realize tolerable performance of blocking probability and time delay.<<ETX>>","PeriodicalId":191242,"journal":{"name":"IEEE International Conference on Communications, - Spanning the Universe.","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116486505","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
On error probability for CPM with Viterbi detection in interference and Gaussian noise 干扰和高斯噪声下Viterbi检测CPM的误差概率
IEEE International Conference on Communications, - Spanning the Universe. Pub Date : 1988-06-12 DOI: 10.1109/ICC.1988.13657
Arne Svensson
{"title":"On error probability for CPM with Viterbi detection in interference and Gaussian noise","authors":"Arne Svensson","doi":"10.1109/ICC.1988.13657","DOIUrl":"https://doi.org/10.1109/ICC.1988.13657","url":null,"abstract":"An upper bound on the symbol error probability is given for a Viterbi detector for continuous phase modulation (CPM), when the desired signal is received in multiple interfering signals and white Gaussian noise. Coherent detection and perfect timing in the detector are assumed. It is found that the smoothed binary and all quaternary modulations sustain much larger interference power in adjacent channel interference than minimum-shift keying does. In cochannel interference, on the other hand, the difference in error performance between the schemes is relatively small.<<ETX>>","PeriodicalId":191242,"journal":{"name":"IEEE International Conference on Communications, - Spanning the Universe.","volume":"213 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120880134","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
An improved discrete time model for the analysis of Delta Sigma modulators with bandlimited Gaussian inputs 一种用于分析带带宽限制高斯输入的σ调制器的改进离散时间模型
IEEE International Conference on Communications, - Spanning the Universe. Pub Date : 1988-06-12 DOI: 10.1109/ICC.1988.13643
J. Stonick, S. Ardalan
{"title":"An improved discrete time model for the analysis of Delta Sigma modulators with bandlimited Gaussian inputs","authors":"J. Stonick, S. Ardalan","doi":"10.1109/ICC.1988.13643","DOIUrl":"https://doi.org/10.1109/ICC.1988.13643","url":null,"abstract":"A second-order Delta Sigma modulator is analyzed using linearized gains to model the nonlinearities associated both with the comparator and with the saturation of the integrators. A set of nine equations in nine unknowns is derived for this model. Simulations results are presented that show that saturation of the integrators can actually increase the SNR.<<ETX>>","PeriodicalId":191242,"journal":{"name":"IEEE International Conference on Communications, - Spanning the Universe.","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125740925","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
Improved carrier acquisition in 64 QAM systems 改进了64 QAM系统的载波采集
IEEE International Conference on Communications, - Spanning the Universe. Pub Date : 1988-06-12 DOI: 10.1109/ICC.1988.13712
H. Sari, S. Moridi
{"title":"Improved carrier acquisition in 64 QAM systems","authors":"H. Sari, S. Moridi","doi":"10.1109/ICC.1988.13712","DOIUrl":"https://doi.org/10.1109/ICC.1988.13712","url":null,"abstract":"Several phase and frequency detectors (PFDs) are presented for improved carrier acquisition in 64 QAM (quadrature amplitude modulation) systems. Some of them are based on rectangular signal representation and are direct extension to 64 QAM of the PFDs previously proposed by the authors for 16 QAM systems. The others are new and use a phase detector based on polar-coordinate representation of the demodulated complex signal. A 34 Mb/s laboratory breadboard was used to evaluate the performance of each detector. The best performance was obtained with the PFDs derived from the polar phase detector. As compared with the original phase detector, these PFDs led to a five- or sixfold increase of the loop acquisition range.<<ETX>>","PeriodicalId":191242,"journal":{"name":"IEEE International Conference on Communications, - Spanning the Universe.","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128568317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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