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Design of a Reed-Solomon decoder using a digital signal processor (DSP) 基于数字信号处理器(DSP)的Reed-Solomon解码器设计
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175644
T. Todoroki, S. Miura
{"title":"Design of a Reed-Solomon decoder using a digital signal processor (DSP)","authors":"T. Todoroki, S. Miura","doi":"10.1109/ITS.1990.175644","DOIUrl":"https://doi.org/10.1109/ITS.1990.175644","url":null,"abstract":"The design of a Reed-Solomon (RS) decoder using two digital signal processors (DSP) is discussed. The RS code is a (255, 223) block code of 8-bit symbols which is capable of correcting up to 16 symbol errors. Any primitive polynomial of GF(2/sup 8/) and generator polynomial for a systematic code can be used. The algorithm used for computing the error-locator polynomial is an Euclid's algorithm. For high-speed decoding, finite field multiplication is carried out by using log and antilog tables in the DSP. A 275 kb/s maximum data transmission rate and 4000 bits for the decoding delay were obtained by using this decoder.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129218087","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
Fiber optic interferometry using auto-homodyne method 自差法光纤干涉测量
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175648
E.L. de Braga, K. Ennser, R. Farias, E. Conforti
{"title":"Fiber optic interferometry using auto-homodyne method","authors":"E.L. de Braga, K. Ennser, R. Farias, E. Conforti","doi":"10.1109/ITS.1990.175648","DOIUrl":"https://doi.org/10.1109/ITS.1990.175648","url":null,"abstract":"Measurements and calculations of interferometrically demodulated phase noise in HeNe lasers are reported. The spectrum of this phase noise closely related to the optical source spectrum. The results obtained show that the Mach-Zehnder interferometer is a good lab instrument for analyzing high-resolution spectra. Theoretical results on semiconductor lasers used in optical communication are also presented.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128667491","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
ATM based B-ISDN access signalling 基于ATM的B-ISDN接入信令
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175653
G. Fioretto, T. Demaria, L. Piovano
{"title":"ATM based B-ISDN access signalling","authors":"G. Fioretto, T. Demaria, L. Piovano","doi":"10.1109/ITS.1990.175653","DOIUrl":"https://doi.org/10.1109/ITS.1990.175653","url":null,"abstract":"A proposal for a preliminary signaling system, which handles ATM (asynchronous transfer mode) point-to-point connections between two users or between a user and a specialized node is discussed. A specialized node supports services which require centralized resources within the network, such as connectionless or multimedia services. An example of this preliminary signaling protocol, which has been implemented in CSELT, is presented, and in particular the signaling functions within the ATM node prototype are analyzed. Considerations for a long-term signaling system, which will have to handle a multiplicity of call configurations, transitions among them during the lifetime of a call, and reconfigurations of attribute values for a connection, are also presented.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128748540","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
Optimal planning of telecommunication networks with logical and physical aspects 电信网络的逻辑与物理优化规划
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175674
G. Mateus, H. Luna, L.C.M. Lage
{"title":"Optimal planning of telecommunication networks with logical and physical aspects","authors":"G. Mateus, H. Luna, L.C.M. Lage","doi":"10.1109/ITS.1990.175674","DOIUrl":"https://doi.org/10.1109/ITS.1990.175674","url":null,"abstract":"The authors introduce a nonlinear integer programming problem to optimize the planning of telecommunication networks, considering logical and physical aspects. The objective function takes into account the economies of scale associated with the modularity of resources, and the model considers the existing network, as well as reallocation of installed switching and transmission equipment. The main aspect considered is the optimization strategy, composed of logical and physical network design. Emphasis is placed on the use of the constant lambda to evaluate the number of additional channels to carry the overflow traffic; the alternative routing is previously defined, and the model permits one or ore first-choice routes and the network modularities. The function B properties are discussed and algorithms to treat the model are suggested.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115836872","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
Leaky bucket analysis for ATM networks ATM网络的漏桶分析
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175655
J. Monteiro, M. Gerla, L. Fratta
{"title":"Leaky bucket analysis for ATM networks","authors":"J. Monteiro, M. Gerla, L. Fratta","doi":"10.1109/ITS.1990.175655","DOIUrl":"https://doi.org/10.1109/ITS.1990.175655","url":null,"abstract":"The authors investigate input rate control in ATM (asynchronous transfer mode) networks. More specifically, they focus on the policing mechanisms, whose function is to assure that the sources abide by their initial specification. They study one such mechanism, the leaky bucket, and use the uniform arrival and service model, as well as simulation to study its effectiveness in bursty traffic. They show that leaky bucket is not adequate for deletion of abusive traffic cells, and therefore, they propose a marking scheme to delete cells only in the case of congestion. They also introduce the notion of reaction time in input rate control and show that the use of multiple leaky buckets in parallel offers an effective tradeoff between average rate enforcement and reaction to sudden bursts.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115866551","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: 6
A neural network controller for a high-speed packet switch 高速分组交换机的神经网络控制器
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175654
M.M. Ali, H. T. Nguyen
{"title":"A neural network controller for a high-speed packet switch","authors":"M.M. Ali, H. T. Nguyen","doi":"10.1109/ITS.1990.175654","DOIUrl":"https://doi.org/10.1109/ITS.1990.175654","url":null,"abstract":"A neural network implementation of an input access scheme in a high-speed packet switch for broadband ISDN (integrated services digital network) is presented. In this switch, each input maintains a separate queue for each of the outputs, thus n/sup 2/ input queues in a (n*n) switch. Using synchronous operation, at most one packet per input and output will be transferred in any slot. A neural network maximizing the throughput of this switch is determined, and the energy function, its optimized parameters, and the connection matrix are given. Comparison of simulations with analytically derived upper and lower bounds shows close to optimal throughput. It is shown that this neural network may be implemented with existing technology for medium switch sizes.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"123 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117322322","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: 5
Parallel protocol implementations for high speed networks 高速网络的并行协议实现
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175609
M. Zitterbart
{"title":"Parallel protocol implementations for high speed networks","authors":"M. Zitterbart","doi":"10.1109/ITS.1990.175609","DOIUrl":"https://doi.org/10.1109/ITS.1990.175609","url":null,"abstract":"The development of high speed networks with data rates of 100 Mbit/s and more as well as the design of advanced applications imposes new requirements on the performance of network nodes. The author describes an approach to overcome the upcoming processing bottlenecks of communication protocols. The approach is based on the use of multiprocessor architectures. Several parallel concepts inside network nodes such as pipeline and array constructs are outlined, and different memory concepts are suggested. Performance measurements of protocol implementations on transputer networks following the proposed parallel concepts indicate very promising performance results.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115412721","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
Optimal multi-h phase codes for full response continuous phase signaling 全响应连续相位信号的最佳多相码
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175657
J. Fonseka
{"title":"Optimal multi-h phase codes for full response continuous phase signaling","authors":"J. Fonseka","doi":"10.1109/ITS.1990.175657","DOIUrl":"https://doi.org/10.1109/ITS.1990.175657","url":null,"abstract":"Multi-h full response CPM (continuous-phase modulated) signals are analyzed at preselected numbers of states in contrast to the standard method of analyzing them at preselected numbers of modulation indices. Optimal multi-h phase codes which produce the highest minimum Euclidean distance are presented according to the number of states. Three orders of multi-h signaling are considered in the optimal code search. Numerical results are presented for binary CPFSK (continuous-phase frequency shift keying) and binary 1RC (1 raised cosine) signals at number of states from four through 12.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125600474","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
Adaptive error control based on type-I hybrid-ARQ protocols 基于i型混合arq协议的自适应误差控制
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175593
M. Rice, S. Wicker
{"title":"Adaptive error control based on type-I hybrid-ARQ protocols","authors":"M. Rice, S. Wicker","doi":"10.1109/ITS.1990.175593","DOIUrl":"https://doi.org/10.1109/ITS.1990.175593","url":null,"abstract":"An adaptive error control technique based on the use of type-I hybrid-ARQ protocols is presented. Nonstationary channels are modeled as finite-state Markov chains. The system counts the number of retransmission requests during an observation interval called a frame and, together with knowledge of the code in use and a set of thresholds, estimates the state of the channel. The code which maximizes throughput while maintaining a minimum level of reliability is chosen for use in the next frame. The optimal code for each state is determined a priori by varying both the rate and the number of errors corrected by a family of fixed-length codes. The procedure is demonstrated using Reed-Solomon codes.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"437 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126121017","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: 6
Computer random simulation on multipath fading 多径衰落的计算机随机模拟
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175599
Z. Yerong
{"title":"Computer random simulation on multipath fading","authors":"Z. Yerong","doi":"10.1109/ITS.1990.175599","DOIUrl":"https://doi.org/10.1109/ITS.1990.175599","url":null,"abstract":"A method is presented in which a computer is used to randomly simulate the statistical distributions of frequency selective fading. Relationships between the in-band frequency correlation coefficient and antenna height, the ground reflection coefficient, and the frequency bandwidth are randomly simulated. Using this method, frequency selective fading was randomly simulated over the Pacem 2 experimental path (a distance of 100 km, operating in the 11.123 GHz to 11.187 GHz range) from Bouffry to Viabon for the total fading period of 1985.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122314653","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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