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IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond最新文献

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Effect of slot size on TDMA performance in presence of per slot overhead 在每个时隙开销的情况下，时隙大小对TDMA性能的影响
IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.64041
M. Sarraf
{"title":"Effect of slot size on TDMA performance in presence of per slot overhead","authors":"M. Sarraf","doi":"10.1109/GLOCOM.1989.64041","DOIUrl":"https://doi.org/10.1109/GLOCOM.1989.64041","url":null,"abstract":"The problem of optimum slot size in the time division multiplexing (TDM) scheme in the presence of per slot overhead is addressed. Per slot overhead occurs in a variety of network structures. Messages are assumed to be of random length, so they may need to be segmented into several slots, and are assumed to be arriving according to a Poisson process. Optimum slot is derived as a function of input rate, message length distribution, overhead per slot, and number of stations. It is also shown how one will be penalized by deviating from this optimum slot size. Guidelines are provided on how to assign unequal slot sizes in cases where different stations have different traffic characteristics. It is shown that this is a cumbersome nonlinear optimization programming problem in general, which reduces to a Kuhn-Tucker optimization programming problem in light traffic situations.<<ETX>>","PeriodicalId":256305,"journal":{"name":"IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134082760","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
A spectrally sliced, single-mode, optical transmission system installed in the UK local loop network 一种安装在英国本地环路网络中的光谱切片单模光传输系统
IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.64164
A. Hunwicks, L. Bickers, P. Rogerson
{"title":"A spectrally sliced, single-mode, optical transmission system installed in the UK local loop network","authors":"A. Hunwicks, L. Bickers, P. Rogerson","doi":"10.1109/GLOCOM.1989.64164","DOIUrl":"https://doi.org/10.1109/GLOCOM.1989.64164","url":null,"abstract":"Described is a four-channel spectrally sliced transmission system installed in field trials in the UK local-loop network. Each channel supported a 2-Mb/s data stream and generated over a 3.5-km section of single-mode fiber. This enabled the connection of field-located 30-channel primary multiplexers to a digital switch located in the central office, making possible the provision of 120 POTS (plain old telephone systems) channels. Grating-based WDM (wavelength division multiplexing) components were used for both multiplexing and demultiplexing functions, enabling the system to operate with >4 dB of margin. An electrooptic primary multiplexer was linked to the public switched telephone network via the system, with no degradation being observed. It has also been shown that critical system components must be carefully specified to ensure that attenuation remains within the system limits over a range of conditions and that multilevel line codes must be considered unsuitable for future spectrally sliced system development.<<ETX>>","PeriodicalId":256305,"journal":{"name":"IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond","volume":"72 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114248528","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
Direct sequence spread spectrum parallel acquisition in a nonselective Rician fast fading channel 非选择性快速衰落信道中的直接序列扩频并行采集
IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.64221
E. Sourour, S.C. Gupta
{"title":"Direct sequence spread spectrum parallel acquisition in a nonselective Rician fast fading channel","authors":"E. Sourour, S.C. Gupta","doi":"10.1109/GLOCOM.1989.64221","DOIUrl":"https://doi.org/10.1109/GLOCOM.1989.64221","url":null,"abstract":"The authors investigate the performance of the direct sequence spread spectrum (DS-SS) parallel acquisition system, previously proposed by the authors (1989) for a nonselective Rician fading channel. The acquisition system utilizes a bank of parallel I-Q noncoherent matched filters for the search mode, and a coincidence detector for the verification mode. The probabilities of detection, false alarm, and missing are derived for the channel under consideration, from which the mean and variance of the acquisition time are evaluated as a measure of the system performance. It is shown that both the mean and variance decrease when the specular component is stronger. The variance decreases rapidly as the signal-to-noise ratio increases while the mean acquisition time reaches its minimum. It is also shown that the effect of the parameters of the fading process is very small.<<ETX>>","PeriodicalId":256305,"journal":{"name":"IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond","volume":"307 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114868545","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
Implementation of video codec with programmable parallel DSP 用可编程并行DSP实现视频编解码器
IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.64093
M. Nomura, J. Suzuki, S. Ono
{"title":"Implementation of video codec with programmable parallel DSP","authors":"M. Nomura, J. Suzuki, S. Ono","doi":"10.1109/GLOCOM.1989.64093","DOIUrl":"https://doi.org/10.1109/GLOCOM.1989.64093","url":null,"abstract":"The implementation of a video codec with a programmable parallel digital signal processor (DSP) is described. The advantages of DSP implementation over dedicated VLSI implementation are discussed. System design concepts and the architecture for a multicomputer-type DSP system called NOVI are reviewed. This system has been developed as a prototype for program development and performance evaluation of parallel processing systems. Intraframe DCT (discrete cosine transform) codec is implemented by NOVI as an example of a transform-type video codec. The processing speed of the implemented codec is examined. This codec can process 9 frames/s (one frame consists of a 256*240 pixel image) using 34 PEs (processing elements): 16 PEs for the coder, 16 PEs for the decoder, and 2 PEs for the video I/O. Packet assembly and multiplexing are also performed by the codec.<<ETX>>","PeriodicalId":256305,"journal":{"name":"IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117127134","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
Real-Time Mentat programming language and architecture 实时心智编程语言和体系结构
IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.63956
A. Grimshaw, A. Silberman, J.W.-S. Liu
{"title":"Real-Time Mentat programming language and architecture","authors":"A. Grimshaw, A. Silberman, J.W.-S. Liu","doi":"10.1109/GLOCOM.1989.63956","DOIUrl":"https://doi.org/10.1109/GLOCOM.1989.63956","url":null,"abstract":"Real-time Mentat, a programming environment designed to simplify the task of programming real-time applications in distributed and parallel environments, is described. It is based on the same data-driven computation model and object-oriented programming paradigm as Mentat. It provides an easy-to-use mechanism to exploit parallelism, language constructs for the expression and enforcement of timing constraints, and run-time support for scheduling and exciting real-time programs. The Real-time Mentat programming language is an extended C++. The extensions are added to facilitate automatic detection of data flow and generation of data flow graphs, to express the timing constraints of individual granules of computation, and to provide scheduling directives for the runtime system. A high-level view of the Real-time Mentat system architecture and programming language constructs is provided.<<ETX>>","PeriodicalId":256305,"journal":{"name":"IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115761257","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: 22
Subjective performance evaluation of the RPE-LTP codec for the pan-European cellular digital mobile radio system 泛欧蜂窝数字移动无线电系统RPE-LTP编解码器的主观性能评价
IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.64123
A. Coleman, N. Gleiss, J. Sotscheck, P. Usai, H. Scheuermann
{"title":"Subjective performance evaluation of the RPE-LTP codec for the pan-European cellular digital mobile radio system","authors":"A. Coleman, N. Gleiss, J. Sotscheck, P. Usai, H. Scheuermann","doi":"10.1109/GLOCOM.1989.64123","DOIUrl":"https://doi.org/10.1109/GLOCOM.1989.64123","url":null,"abstract":"The planned pan-European cellular digital mobile radio (DMR) system will use a regular pulse excitation with long-term predictor (RPE-LTP), 13 kb/s codec. Four phases of experimentation were planned: (1) national preselection tests; (2) European selection tests; (3) optimization tests; and (4) verification and characterization tests with simulated burst-error patterns. The subjective listening tests adopted are described, and an outline of the performance of the RPE-LTP codec with other parts of the digital network is given. Some general guidance is also given on its performance with nonvoice services which include information and DTMF tones.<<ETX>>","PeriodicalId":256305,"journal":{"name":"IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116279685","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: 12
Mobile teletext reception using signal processing in frequency domain 基于频域信号处理的移动文本接收
IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.64007
A. Tsuzuku, Y. Ishikawa
{"title":"Mobile teletext reception using signal processing in frequency domain","authors":"A. Tsuzuku, Y. Ishikawa","doi":"10.1109/GLOCOM.1989.64007","DOIUrl":"https://doi.org/10.1109/GLOCOM.1989.64007","url":null,"abstract":"An experimental study of mobile teletext reception is described. Teletext in Japan is a broadband signal with 5.73 Mb/s; therefore, multipath interference is a serious problem in mobile reception, and it is impossible to obtain the teletext correctly by conventional methods. A multipath reduction technique using signal processing in the frequency domain is developed. In this technique, an original chirp signal is used for reference to identify radio propagation paths. In field trials, the delay profile is precisely obtained, and the bit error rate can be reduced. the error correction capability is also tested in a computer simulation. The proposed method was found to improve the error rate when the signal-to-noise ratio was greater than 20 dB.<<ETX>>","PeriodicalId":256305,"journal":{"name":"IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115004178","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
Voice packet communication system for private networks 专网语音分组通信系统
IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.64263
K. Saito, H. Fujiya, H. Kohmura, S. Kanno
{"title":"Voice packet communication system for private networks","authors":"K. Saito, H. Fujiya, H. Kohmura, S. Kanno","doi":"10.1109/GLOCOM.1989.64263","DOIUrl":"https://doi.org/10.1109/GLOCOM.1989.64263","url":null,"abstract":"The authors describe the design methodologies and system configuration for a voice packet communication system (voice PAD) which is installed on a high-speed packet switching system for multimedia communications. The voice PAD is experimentally fabricated for voice communications in the packet multiplexing mode between PABXs via digital leased lines. Speech quality during network overload is protected from serious degradation by embedded ADPCM (adaptive differential pulse code modulation) speech coding and by most-significant bits (MSB) and least-significant bits (LSB) packet interleaving. This interleaving reduces the processing load on the switching system processors required to drop LSB speech sample packets following traffic congestion. The techniques presented are based on a fixed-length packet format and are well suited to asynchronous transfer mode environments.<<ETX>>","PeriodicalId":256305,"journal":{"name":"IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond","volume":"144 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122980934","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
SONET equipment availability requirements SONET设备可用性要求
IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.64201
B. Lewin
{"title":"SONET equipment availability requirements","authors":"B. Lewin","doi":"10.1109/GLOCOM.1989.64201","DOIUrl":"https://doi.org/10.1109/GLOCOM.1989.64201","url":null,"abstract":"The author discusses channel availability criteria for synchronous optical network (SONET) network elements. He considers the existing short-haul, interoffice channel availability requirements that apply to the current asynchronous network, discusses how these requirements apply to the synchronous network, and translates the requirements to channels transmitted through SONET network elements. The SONET network elements must have minimum availability requirements to enable the SONET network to meet end-to-end availability performance. Individual terminal and regenerator availability criteria are proposed.<<ETX>>","PeriodicalId":256305,"journal":{"name":"IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond","volume":"22 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123699176","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 hand-shake protocol for spread spectrum multiple access networks 扩频多址网络的握手协议
IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.63983
M. Hsiao, S. Jiang
{"title":"A hand-shake protocol for spread spectrum multiple access networks","authors":"M. Hsiao, S. Jiang","doi":"10.1109/GLOCOM.1989.63983","DOIUrl":"https://doi.org/10.1109/GLOCOM.1989.63983","url":null,"abstract":"A receiver-based protocol for spread-spectrum multiple-access networks is proposed and analyzed. This scheme is based on a handshake procedure before any formal transmission of data packets. The protocol is collision-free during data transmission and can limit the number of simultaneous transmissions. The system is modeled as a two-dimensional Markov chain from which the throughput can be determined. Numerical results are presented and compared with those for other protocols. With a minislotted channel, the handshaking time is reasonably short, and it is shown that the performance can be significantly improved when the average packet length is not too small. Moreover, very high throughput can still be maintained, even when the offered traffic is high. The proposed protocol can be applied in multipoint to point situations as well as in multihop radio networks with a central station in each hop.<<ETX>>","PeriodicalId":256305,"journal":{"name":"IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122847501","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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