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1994 IEEE GLOBECOM. Communications: The Global Bridge最新文献

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Phase noise insensitive orthogonal M-ary polarization state modulation (OMPSM) system in optical intersatellite link 星间光链路中相位噪声不敏感正交m偏振态调制系统
1994 IEEE GLOBECOM. Communications: The Global Bridge Pub Date : 1994-11-28 DOI: 10.1109/GLOCOM.1994.512844
K. Tsukamoto, T. Kuri, S. Komaki, N. Morinaga
{"title":"Phase noise insensitive orthogonal M-ary polarization state modulation (OMPSM) system in optical intersatellite link","authors":"K. Tsukamoto, T. Kuri, S. Komaki, N. Morinaga","doi":"10.1109/GLOCOM.1994.512844","DOIUrl":"https://doi.org/10.1109/GLOCOM.1994.512844","url":null,"abstract":"Coherent optical communication system is expected to be a strong candidate for future ISL applications under the seriously power limited condition, because of its advantage of obtaining near-quantum-limited performance. This paper proposes an orthogonal M-ary polarization state modulation (OMPSM)/heterodyne detection system, which can perfectly remove the phase noise of a laser and attain a sensitivity improvement with the increase of the symbol level M in the presence of any phase noise. The fundamental principle of the proposed system is shown, and the receiver performance is investigated and compared to an orthogonal M-ary FSK system, theoretically. The results show that in the presence of large phase noise, OMPSM system can improve the sensitivity by more than 2.2 dB with less transmission bandwidth than OMFSK.","PeriodicalId":323626,"journal":{"name":"1994 IEEE GLOBECOM. Communications: The Global Bridge","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133954540","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
Recovering guaranteed performance service connections from single and multiple faults 从单个和多个故障中恢复有保证性能的业务连接
1994 IEEE GLOBECOM. Communications: The Global Bridge Pub Date : 1994-11-28 DOI: 10.1109/GLOCOM.1994.513400
A. Banerjea, C. Parris, Domenico Ferrari
{"title":"Recovering guaranteed performance service connections from single and multiple faults","authors":"A. Banerjea, C. Parris, Domenico Ferrari","doi":"10.1109/GLOCOM.1994.513400","DOIUrl":"https://doi.org/10.1109/GLOCOM.1994.513400","url":null,"abstract":"Fault recovery techniques must be reexamined in the light of the new guaranteed performance services that high-speed packet/cell switched networks will support. We investigate the rerouting of guaranteed performance service connections on the occurrence of link faults, focussing on the aspects of route selection and establishment in the network. In a previous investigation, we explored some components of rerouting in the presence of single link faults in the network. In this paper we study the behavior of our techniques in the presence of multiple link faults in the network. We also examine the technique of retries to improve the success of rerouting. Our schemes are simulated on a cross-section of network workloads, and compared using several performance criteria. We use our results to develop a new delayed retry technique, which performs well for all our performance criteria.","PeriodicalId":323626,"journal":{"name":"1994 IEEE GLOBECOM. Communications: The Global Bridge","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131550119","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: 49
Classification and spectral extrapolation based packet reconstruction for low-delay speech coding 基于分类和频谱外推的低延迟语音编码分组重构
1994 IEEE GLOBECOM. Communications: The Global Bridge Pub Date : 1994-11-28 DOI: 10.1109/GLOCOM.1994.512714
A. Husain, V. Cuperman
{"title":"Classification and spectral extrapolation based packet reconstruction for low-delay speech coding","authors":"A. Husain, V. Cuperman","doi":"10.1109/GLOCOM.1994.512714","DOIUrl":"https://doi.org/10.1109/GLOCOM.1994.512714","url":null,"abstract":"A common aspect of speech transmission through packetized networks is the need to consider discarded (missing) packets as a result of error detection or network overload. The missing packets and the possible mistracking that results in the speech decoder lead to significant quality degradation. In this paper, we examine recovery techniques based on speech classification and spectral extrapolation. The recovery system extrapolates independently the excitation signal and the short-term synthesis filter using an extrapolation strategy based on speech classification (voiced, unvoiced, transition, silence). The extrapolation of the short-term filter uses a least-squares fading memory polynomial filter applied to reflection coefficients. Objective and subjective quality evaluations of the recovery system applied to the LD-CELP G.728 standard for random and burst frame erasures are presented. The results indicate that the system is robust up to a frame erasure rate of 10%. Very little degradation in quality was observed at erasure rates up to 3% for random frame erasures.","PeriodicalId":323626,"journal":{"name":"1994 IEEE GLOBECOM. Communications: The Global Bridge","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131220329","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
On the "personalization" of PCS 论个人电脑的“个性化”
1994 IEEE GLOBECOM. Communications: The Global Bridge Pub Date : 1994-11-28 DOI: 10.1109/GLOCOM.1994.512688
C. Bedingfield
{"title":"On the \"personalization\" of PCS","authors":"C. Bedingfield","doi":"10.1109/GLOCOM.1994.512688","DOIUrl":"https://doi.org/10.1109/GLOCOM.1994.512688","url":null,"abstract":"With a few recent exceptions, telecommunication services have historically provided connections between terminals rather than between persons. Recent technical developments have introduced the capability to utilize these terminal connections so as to provide logical connections between users. This possibility introduces a new set of telecommunications challenges. This paper explores these challenges, lists some necessary global capabilities, and offers a few sample solutions.","PeriodicalId":323626,"journal":{"name":"1994 IEEE GLOBECOM. Communications: The Global Bridge","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131934932","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
SONET/SDH pointer processor implementations SONET/SDH指针处理器实现
1994 IEEE GLOBECOM. Communications: The Global Bridge Pub Date : 1994-11-28 DOI: 10.1109/GLOCOM.1994.513599
M. Klein, R. Urbansky
{"title":"SONET/SDH pointer processor implementations","authors":"M. Klein, R. Urbansky","doi":"10.1109/GLOCOM.1994.513599","DOIUrl":"https://doi.org/10.1109/GLOCOM.1994.513599","url":null,"abstract":"SONET/SDH is replacing PDH because it offers additional features and reduced equipment cost. As the actual introduction of SDH equipment commences, interworking problems due to deficiencies in the context of network synchronization and timing are becoming apparent. This is due to deficiencies in pointer processor implementations which result in severe compatibility problems where interworking with client networks (like the PSTN) is required. It is shown, that by improving the pointer processor design-with a negligible impact on its cost-PDH-like transmission characteristics (jitter, wander) can be achieved resulting in a cheaper network solution with better performance.","PeriodicalId":323626,"journal":{"name":"1994 IEEE GLOBECOM. Communications: The Global Bridge","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128882912","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
Spread frequency shift keying-a low cost approach to spread spectrum 扩频移键-一种低成本的扩频方法
1994 IEEE GLOBECOM. Communications: The Global Bridge Pub Date : 1994-11-28 DOI: 10.1109/GLOCOM.1994.513169
T. Schaub
{"title":"Spread frequency shift keying-a low cost approach to spread spectrum","authors":"T. Schaub","doi":"10.1109/GLOCOM.1994.513169","DOIUrl":"https://doi.org/10.1109/GLOCOM.1994.513169","url":null,"abstract":"A binary modulation and demodulation technique is presented which is particularly suited for channels with non white interferers and/or for channels with different attenuations at the two signalling frequencies. Because spread frequency shift keying is mainly based on classical FSK modem technology it can be easily implemented and it is well suited for low cost applications. The improvement in performance compared to FSK can be up to 15 dB depending on the characteristics of the channel.","PeriodicalId":323626,"journal":{"name":"1994 IEEE GLOBECOM. Communications: The Global Bridge","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134499665","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 distributed network management system 分布式网络管理系统
1994 IEEE GLOBECOM. Communications: The Global Bridge Pub Date : 1994-11-28 DOI: 10.1109/GLOCOM.1994.513579
Kwang-Hui Lee
{"title":"A distributed network management system","authors":"Kwang-Hui Lee","doi":"10.1109/GLOCOM.1994.513579","DOIUrl":"https://doi.org/10.1109/GLOCOM.1994.513579","url":null,"abstract":"This paper presents a distributed network management system which provides a means to manage communication network for distributed systems. For efficient network management, the multi-level domain approach has been used. Management function (Configuration, Fault, Performance management) is distributed in each management domain. The management system was composed of several elements. Some of those were previously implemented in the project of the single level multi-domain network management system. The integration of different networks which have different network management schemes can also be achieved with the distributed network management system. The object-oriented distributed database was chosen for management information base (MIB). We finished the design of the system and are in the middle of it implementation in the environment of distributed campus network (CNUNet).","PeriodicalId":323626,"journal":{"name":"1994 IEEE GLOBECOM. Communications: The Global Bridge","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115329477","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: 13
Analysis of a digital modem for continuous-phase CDMA terrestrial mobile radio communications over the 60 GHz channel 60 GHz信道上用于连续相位CDMA地面移动无线电通信的数字调制解调器分析
1994 IEEE GLOBECOM. Communications: The Global Bridge Pub Date : 1994-11-28 DOI: 10.1109/GLOCOM.1994.512808
F. Giannetti, M. Luise, R. Reggiannini
{"title":"Analysis of a digital modem for continuous-phase CDMA terrestrial mobile radio communications over the 60 GHz channel","authors":"F. Giannetti, M. Luise, R. Reggiannini","doi":"10.1109/GLOCOM.1994.512808","DOIUrl":"https://doi.org/10.1109/GLOCOM.1994.512808","url":null,"abstract":"This paper reports on the structure and the performance of a band-limited spread-spectrum transmission system employing generalized MSK modulated signals together with asynchronous code-division multiple access. The system is intended for use in short-range terrestrial mobile radio links, particularly intervehicle or vehicle-to-infrastructure communications. The system performance over a 60 GHz short-range mobile radio channel model is analyzed assuming the average bit error rate (BER) as a figure of merit. The BER sensitivity to a number of relevant link parameters, such as the distance between transmit and receive antennas and the receiver speed is investigated. Also, the impact of code tracking errors and of differential encoding/detection of the code chips on the overall performance is discussed.","PeriodicalId":323626,"journal":{"name":"1994 IEEE GLOBECOM. Communications: The Global Bridge","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115514765","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
Performance evaluation of ATM/TDMA conversion protocol by using MMPP arrival model 基于MMPP到达模型的ATM/TDMA转换协议性能评价
1994 IEEE GLOBECOM. Communications: The Global Bridge Pub Date : 1994-11-28 DOI: 10.1109/GLOCOM.1994.513000
A. Ohta, K. Okada, H. Mizuno
{"title":"Performance evaluation of ATM/TDMA conversion protocol by using MMPP arrival model","authors":"A. Ohta, K. Okada, H. Mizuno","doi":"10.1109/GLOCOM.1994.513000","DOIUrl":"https://doi.org/10.1109/GLOCOM.1994.513000","url":null,"abstract":"In order to realize nationwide broadband ISDN (B-ISDN) systems immediately and economically, the application of satellite time division multiple access (TDMA) systems to B-ISDN is being studied. Asynchronous transfer mode (ATM) makes it possible for the terrestrial B-ISDN, to offer multimedia services with various transmission speeds and qualities using a simple network structure. However, conversion between ATM and TDMA causes cell delay variation (CDV); one of the most important transmission problems in ATM systems. To compensate the CDV generated on satellite links, we have proposed ATM/TDMA conversion protocols. We clarify a design method of the cell number counting protocol (CNCP) and the CDV compensation performance of the CNCP by using a Markov modulated Poisson process (MMPP) model. The analytical results show that the CDV can be compensated by optimizing the system parameters of the CNCP.","PeriodicalId":323626,"journal":{"name":"1994 IEEE GLOBECOM. Communications: The Global Bridge","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115568046","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
DS/CDMA coherent detection system with a suppressed pilot channel 带抑制导频信道的DS/CDMA相干检测系统
1994 IEEE GLOBECOM. Communications: The Global Bridge Pub Date : 1994-11-28 DOI: 10.1109/GLOCOM.1994.513150
S. Abeta, S. Sampei, N. Morinaga
{"title":"DS/CDMA coherent detection system with a suppressed pilot channel","authors":"S. Abeta, S. Sampei, N. Morinaga","doi":"10.1109/GLOCOM.1994.513150","DOIUrl":"https://doi.org/10.1109/GLOCOM.1994.513150","url":null,"abstract":"This paper proposes a DS/CDMA coherent detection system using a suppressed pilot channel to achieve coherent RAKE diversity combining for up-link land mobile communication systems. At the receiver we apply a chip timing recovery scheme based on block demodulation and maximum likelihood estimation, and measure the complex delay profile. Proposed adaptive RAKE diversity performance in the case of QPSK is evaluated by computer simulation. As a result, the BER performance of the proposed system is superior to that of the conventional systems.","PeriodicalId":323626,"journal":{"name":"1994 IEEE GLOBECOM. Communications: The Global Bridge","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124247381","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: 21
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