发布求助
文献互助 智能选刊 最新文献

IEEE International Conference on Communications, Including Supercomm Technical Sessions最新文献

筛选
英文 中文
Linking Yourdon and SDL to support telecommunication systems production 连接Yourdon和SDL以支持电信系统生产
IEEE International Conference on Communications, Including Supercomm Technical Sessions Pub Date : 1990-04-16 DOI: 10.1109/ICC.1990.117103
M. Morley, M. Tilley
{"title":"Linking Yourdon and SDL to support telecommunication systems production","authors":"M. Morley, M. Tilley","doi":"10.1109/ICC.1990.117103","DOIUrl":"https://doi.org/10.1109/ICC.1990.117103","url":null,"abstract":"It is noted that CASE (computer-aided software engineering) toolsets which can provide fully integrated support from models of the real world through to physical implementation are now beginning to emerge. However, these toolsets are largely restricted to date-dominated systems with simple control elements, and to cases where the final implementation will be on a DBMS (database management system). For developers who must deal with more complex control elements such as telecommunications systems, CASE toolsets have significant limitations. British Telecom is attempting to address some of the weaknesses by combining structured analysis notations with SDL (Specification and Description Language) task-level notations, and automatic source code production from the task level. The authors outline the causes for, this program and give the results from the early projects that have led to this approach.<<ETX>>","PeriodicalId":126008,"journal":{"name":"IEEE International Conference on Communications, Including Supercomm Technical Sessions","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132202059","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
Bandwidth-efficient trellis coded modulation schemes 带宽效率高的格子编码调制方案
IEEE International Conference on Communications, Including Supercomm Technical Sessions Pub Date : 1990-04-16 DOI: 10.1109/ICC.1990.117319
S. Ramseier
{"title":"Bandwidth-efficient trellis coded modulation schemes","authors":"S. Ramseier","doi":"10.1109/ICC.1990.117319","DOIUrl":"https://doi.org/10.1109/ICC.1990.117319","url":null,"abstract":"The author proposes a scheme that shapes the power density spectrum of the transmitted signal to reduce its bandwidth. The encoder is modeled as a finite-state machine consisting of a shift register and a mapper. A pulse-shaping filter generates time-limited or Nyquist pulses. The whole system is optimized with respect to bandwidth and power efficiency, where average-power and peak-power criteria are considered. The author presents the achievable data rates of systems with quaternary input symbols and an out-of-band power of -20 dB for the various mappers and pulse-shaping filters considered. It can be seen that bandlimited pulses allow roughly a doubling of the data rate with respect to time-limited pulses. The bandwidth gain that can be reached with proper coding is remarkable. The drawback is the increased receiver complexity needed to resolve the intersymbol interference.<<ETX>>","PeriodicalId":126008,"journal":{"name":"IEEE International Conference on Communications, Including Supercomm Technical Sessions","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130434553","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
Transport network evolution strategies for ATM based B-ISDN 基于ATM的B-ISDN传输网络演进策略
IEEE International Conference on Communications, Including Supercomm Technical Sessions Pub Date : 1990-04-16 DOI: 10.1109/ICC.1990.117310
P. Probst, S. Rao
{"title":"Transport network evolution strategies for ATM based B-ISDN","authors":"P. Probst, S. Rao","doi":"10.1109/ICC.1990.117310","DOIUrl":"https://doi.org/10.1109/ICC.1990.117310","url":null,"abstract":"The capabilities of existing transport networks and of synchronous digital hierarchy systems are discussed. The evolution of these networks toward the target broadband integrated services digital network based on asynchronous transfer mode implies new ATM-based transmission standards. This point is highlighted through the possible introduction strategies. Specifically, the introduction strategy that starts with the CCITT G.702 series and SDH and proceeds toward an optimized ATM transmission network is discussed, and the major advantages and disadvantages of each choice are outlined.<<ETX>>","PeriodicalId":126008,"journal":{"name":"IEEE International Conference on Communications, Including Supercomm Technical Sessions","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131250408","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
Open systems protocol testing techniques 开放系统协议测试技术
IEEE International Conference on Communications, Including Supercomm Technical Sessions Pub Date : 1990-04-16 DOI: 10.1109/ICC.1990.117295
K. Rasmussen
{"title":"Open systems protocol testing techniques","authors":"K. Rasmussen","doi":"10.1109/ICC.1990.117295","DOIUrl":"https://doi.org/10.1109/ICC.1990.117295","url":null,"abstract":"The author discusses the steps involved in testing data communications systems, with emphasis on OSI protocols and the various testing methods defined by standards. Particular attention is given to three stages of protocol testing: conformance testing, interoperability testing, and real effects testing. Emphasis is placed on conformance testing, since the focus of standards activity in testing is on this stage. The author also highlights specific areas which have product impact, some of which are not immediately obvious.<<ETX>>","PeriodicalId":126008,"journal":{"name":"IEEE International Conference on Communications, Including Supercomm Technical Sessions","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129248694","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
Analysis of signal-to-noise ratio distributions and bit error rates for equal gain diversity systems on generalized fading channels 广义衰落信道等增益分集系统的信噪比分布和误码率分析
IEEE International Conference on Communications, Including Supercomm Technical Sessions Pub Date : 1990-04-16 DOI: 10.1109/ICC.1990.117313
N. Beaulieu, A. Abu-Dayya
{"title":"Analysis of signal-to-noise ratio distributions and bit error rates for equal gain diversity systems on generalized fading channels","authors":"N. Beaulieu, A. Abu-Dayya","doi":"10.1109/ICC.1990.117313","DOIUrl":"https://doi.org/10.1109/ICC.1990.117313","url":null,"abstract":"An infinite series for the complementary probability distribution function of the signal-to-noise ratio at the output of L-branch equal-gain diversity combiners in Nakagami fading channels is derived. The bit error rate for a matched-filter receiver is analyzed for the combiner and different fading parameters. Both coherent phase-shift keying and differential coherent phase-shift keying are considered. The effects of gain unbalance between branches on the probability distribution of the SNR and on the bit error rates are investigated. Bit-error-rate results are also obtained for coherent and noncoherent reception of frequency-shift keying. The effects of gain unbalances on FSK modulations are also investigated. It is shown that, even with -20 dB (k=0.01) gain unbalance between the branches of a dual combiner, there is still a considerable improvement over the nondiversity instance for the generalized fading model (m=1).<<ETX>>","PeriodicalId":126008,"journal":{"name":"IEEE International Conference on Communications, Including Supercomm Technical Sessions","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121471552","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
Fading characteristics of a geographically fixed, normally line of sight, 450 MHz radio channel in the Southeastern United States 美国东南部一个地理上固定的、通常视线的450兆赫无线电频道的衰落特性
IEEE International Conference on Communications, Including Supercomm Technical Sessions Pub Date : 1990-04-16 DOI: 10.1109/ICC.1990.117256
G.N. Patterson
{"title":"Fading characteristics of a geographically fixed, normally line of sight, 450 MHz radio channel in the Southeastern United States","authors":"G.N. Patterson","doi":"10.1109/ICC.1990.117256","DOIUrl":"https://doi.org/10.1109/ICC.1990.117256","url":null,"abstract":"Described are the fading characteristics of a normally line-of-sight, fixed-station 450 MHz radio path, which can be typical of paths encountered in a basic exchange telecommunications radio (BETR) system in the southeastern United States. The fading parameters of the radio channel examined are slope and attenuation, the characteristics of which are expressed with density functions and cumulative distributions of data gathered over a 5 and a 1/2 month period. The knowledge derived from these measurements should permit more accurate radio system engineering and aid in determining BETR system requirements for this region of the country. One application of this information will be to determine the optimum fade margins for the design of BETR installations. This will allow the greatest possible range of service without degrading system availability, a consequence of excessive fade margins. The slope information is useful in predicting the bit error rate performance of 450 MHz digital radio systems in determination of the need for adaptive equalization.<<ETX>>","PeriodicalId":126008,"journal":{"name":"IEEE International Conference on Communications, Including Supercomm Technical Sessions","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126483316","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
Transform coding of high quality digital audio at low bit rates-algorithms and implementation 低比特率下高质量数字音频的转换编码算法与实现
IEEE International Conference on Communications, Including Supercomm Technical Sessions Pub Date : 1990-04-16 DOI: 10.1109/ICC.1990.117211
K. Brandenburg, H. Gerhser, D. Seitzer, T. Sporer
{"title":"Transform coding of high quality digital audio at low bit rates-algorithms and implementation","authors":"K. Brandenburg, H. Gerhser, D. Seitzer, T. Sporer","doi":"10.1109/ICC.1990.117211","DOIUrl":"https://doi.org/10.1109/ICC.1990.117211","url":null,"abstract":"Low-bit-rate coding schemes for coding high-quality digital audio at bit rates of 64 to 128 kbit/s per channel are described. LC-ATC (low-complexity adaptive transform coding) and OCF (optimum coding in the frequency domain) both use transform coding to get high redundancy removal and high adaptation to the perceptual requirements. OCF uses entropy coding of the spectral values for increased coding efficiency and flexibility of the coder. Real-time implementations using the DSP32(C) and DSP 56000 digital signal processors are presented for both algorithms. Results using listening tests and noise-to-mask ratio are given: CE quality can be achieved at 2 bit/sample. At 64 kbit/s, the quality at 15 kHz bandwidth is still higher than today's FM radio.<<ETX>>","PeriodicalId":126008,"journal":{"name":"IEEE International Conference on Communications, Including Supercomm Technical Sessions","volume":"312 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121172126","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: 4
Flexible asynchronous transfer mode networks utilizing virtual paths 灵活的异步传输模式网络利用虚拟路径
IEEE International Conference on Communications, Including Supercomm Technical Sessions Pub Date : 1990-04-16 DOI: 10.1109/ICC.1990.117192
K. Sato, I. Tokizawa
{"title":"Flexible asynchronous transfer mode networks utilizing virtual paths","authors":"K. Sato, I. Tokizawa","doi":"10.1109/ICC.1990.117192","DOIUrl":"https://doi.org/10.1109/ICC.1990.117192","url":null,"abstract":"The effect of virtual paths in ATM (asynchronous transfer mode) networks is investigated. The virtual path concept has been proposed as the key technique in enhancing network performance. The impact of the virtual path scheme on transport network architecture and systems is demonstrated in comparison to the digital path scheme in STM-based networks. One of the outstanding virtual path benefits, increased network flexibility, is highlighted. It is shown that dynamic network reconfiguration capability is effectively provided with the virtual path scheme. Some analytical results on the adaptive virtual path bandwidth control effects for multimedia traffic are provided.<<ETX>>","PeriodicalId":126008,"journal":{"name":"IEEE International Conference on Communications, Including Supercomm Technical Sessions","volume":"366 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122847144","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: 67
Requirements and prospects for multiservice business networks 多业务业务网络的需求与展望
IEEE International Conference on Communications, Including Supercomm Technical Sessions Pub Date : 1990-04-16 DOI: 10.1109/ICC.1990.117306
G. Freschi, D. Roffinella, C. Trinchero
{"title":"Requirements and prospects for multiservice business networks","authors":"G. Freschi, D. Roffinella, C. Trinchero","doi":"10.1109/ICC.1990.117306","DOIUrl":"https://doi.org/10.1109/ICC.1990.117306","url":null,"abstract":"The authors address new architectural concepts for organizing heterogeneous network components into a system framework. Reference scenarios foreseeable in the following decade are given, with the interaction of market trends and technical achievements taken into account. After a requirements analysis, a multiservice business network architecture suitable for early deployment and with the possibility of evolving into a future broadband integrated services digital network is proposed. This architecture, besides exploiting the capabilities of distributed switching, typical of metropolitan area network technology, avoids capacity limitations caused by the use of single-level shared-medium topologies.<<ETX>>","PeriodicalId":126008,"journal":{"name":"IEEE International Conference on Communications, Including Supercomm Technical Sessions","volume":"112 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131439110","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
Adaptive signalling in distributed self-organizing mobile packet radio networks 分布式自组织移动分组无线网络中的自适应信令
IEEE International Conference on Communications, Including Supercomm Technical Sessions Pub Date : 1990-04-16 DOI: 10.1109/ICC.1990.117265
L. C. Pond, V. Li
{"title":"Adaptive signalling in distributed self-organizing mobile packet radio networks","authors":"L. C. Pond, V. Li","doi":"10.1109/ICC.1990.117265","DOIUrl":"https://doi.org/10.1109/ICC.1990.117265","url":null,"abstract":"Adaptive signaling policies are developed that increase the utilization of the signaling channel without the requisite decrease in the data channel capacity. The increased responsiveness of a packet radio network obtained using the adaptive signaling policies is examined as an example. Improved network responsiveness was obtained for those networks where the signaling channel cycle length must be set to accommodate the maximum number of users but in typical deployments fewer than the maximum may actually participate. The effectiveness of these policies at increasing responsiveness without a corresponding decrease in data capacity is demonstrated numerically.<<ETX>>","PeriodicalId":126008,"journal":{"name":"IEEE International Conference on Communications, Including Supercomm Technical Sessions","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131600248","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
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信