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Multiservice on-board switching for mobile satellite communications 移动卫星通信的多业务机载交换
IEEE International Conference on Communications, - Spanning the Universe. Pub Date : 1988-06-12 DOI: 10.1109/ICC.1988.13620
L. Bella
{"title":"Multiservice on-board switching for mobile satellite communications","authors":"L. Bella","doi":"10.1109/ICC.1988.13620","DOIUrl":"https://doi.org/10.1109/ICC.1988.13620","url":null,"abstract":"Future satellites for mobile communications will be required to interface ground ISDN (integrated services digital network) and to provide services and performances comparable with those offered by cellular radio networks. Onboard processing is a key technique to satisfy these requirements and can provide efficient integration with fixed satellite services. The European Space Agency (ESA) has started the development of a laboratory prototype of the baseband elements of a mobile satellite system, including the onboard processor and the mobile terminals. The prototype will handle several services (voice, circuit, and packet data) and will be compatible not only with laboratory testing, but also with in-field experiments through double-hops via existing transparent satellite. The network requirements and system architecture aspects are reviewed, the relevant access and synchronization techniques are outlined, and the processor structure and operation are described.<<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":"116038120","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
Digital on-board multicarrier demodulator for mobile satellite communications 用于移动卫星通信的数字机载多载波解调器
IEEE International Conference on Communications, - Spanning the Universe. Pub Date : 1988-06-12 DOI: 10.1109/ICC.1988.13619
T. Alberty, G. Bjornstrom, H. Eyssele, H. Gockler, V. Hespelt
{"title":"Digital on-board multicarrier demodulator for mobile satellite communications","authors":"T. Alberty, G. Bjornstrom, H. Eyssele, H. Gockler, V. Hespelt","doi":"10.1109/ICC.1988.13619","DOIUrl":"https://doi.org/10.1109/ICC.1988.13619","url":null,"abstract":"The development of an electrical demonstration model of a 32-channel on-board multicarrier demodulator for the return up-link of a (land) mobile satellite communication system is described. Continuous-mode coded speech and data as well as data packets are transmitted at a rate of 9.6 kb/s using filtered QPSK modulation. The implementation is fully digital. The design and obtained performance of the demultiplexer, based on the highly modular and computationally efficient hierarchical multistage method, and the subsequent demodulator are described. Good demodulator acquisition and tracking performance are obtained by the use of parameter estimation techniques and sophisticated frequency, phase and timing control loops.<<ETX>>","PeriodicalId":191242,"journal":{"name":"IEEE International Conference on Communications, - Spanning the Universe.","volume":"23 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":"116140364","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
ISDN: providing customer business solutions ISDN:为客户提供业务解决方案
IEEE International Conference on Communications, - Spanning the Universe. Pub Date : 1988-06-12 DOI: 10.1109/ICC.1988.13787
R. H. Montgomery
{"title":"ISDN: providing customer business solutions","authors":"R. H. Montgomery","doi":"10.1109/ICC.1988.13787","DOIUrl":"https://doi.org/10.1109/ICC.1988.13787","url":null,"abstract":"Bell Canada's approach using ISDN (integrated-services digital network standards) to the development of commercial services for the business market is described from a marketing perspective Bell Canada's service architecture, customer benefits, and services are also described.<<ETX>>","PeriodicalId":191242,"journal":{"name":"IEEE International Conference on Communications, - Spanning the Universe.","volume":"463 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":"122790566","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
Problems and algorithms for the introduction of the variable origin in a TST/SS-TDMA system 在TST/SS-TDMA系统中引入变量原点的问题和算法
IEEE International Conference on Communications, - Spanning the Universe. Pub Date : 1988-06-12 DOI: 10.1109/ICC.1988.13667
M. Annoni, F. Settimo, G. Ventimiglia
{"title":"Problems and algorithms for the introduction of the variable origin in a TST/SS-TDMA system","authors":"M. Annoni, F. Settimo, G. Ventimiglia","doi":"10.1109/ICC.1988.13667","DOIUrl":"https://doi.org/10.1109/ICC.1988.13667","url":null,"abstract":"The authors present a system solution (feasibility analysis and algorithm implementation) for a time-division multiaccess (TDMA) satellite system with onboard time-space-time (TST) switching stages. The procedures for the variable origin rearrangement, i.e., the dynamic management of both position and capacity of the bursts along a TDMA frame, are detailed. Special attention is devoted to arranging procedures according to a parallel processing architecture so as to shorten the rearrangement duration.<<ETX>>","PeriodicalId":191242,"journal":{"name":"IEEE International Conference on Communications, - Spanning the Universe.","volume":"1 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":"122792253","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
Microwave interference due to building reflections and orientation of city blocks 由建筑物反射和城市街区方向引起的微波干扰
IEEE International Conference on Communications, - Spanning the Universe. Pub Date : 1988-06-12 DOI: 10.1109/ICC.1988.13716
A.R. Noerpel, A. Ranade
{"title":"Microwave interference due to building reflections and orientation of city blocks","authors":"A.R. Noerpel, A. Ranade","doi":"10.1109/ICC.1988.13716","DOIUrl":"https://doi.org/10.1109/ICC.1988.13716","url":null,"abstract":"The interference due to reflections from city structures in terrestrial microwave communications links is examined. The authors demonstrate that the reflected and diffracted energy from such surfaces shows dependence on the orientation of major streets and can vary 25 to 45 dB. A comparison between the scattered energy from a detailed city model composed of buildings and that from a simpler model composed of city blocks shows that salient specular patterns are very similar. A simple method is proposed to identify potentially strong reflections into a point-to-point radio link, a method which will improve frequency coordination procedures.<<ETX>>","PeriodicalId":191242,"journal":{"name":"IEEE International Conference on Communications, - Spanning the Universe.","volume":"22 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":"122839135","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
Ultra fast-fiber-optic networks using all-optical processing 使用全光处理的超快速光纤网络
IEEE International Conference on Communications, - Spanning the Universe. Pub Date : 1988-06-12 DOI: 10.1109/ICC.1988.13797
P. Prucnal
{"title":"Ultra fast-fiber-optic networks using all-optical processing","authors":"P. Prucnal","doi":"10.1109/ICC.1988.13797","DOIUrl":"https://doi.org/10.1109/ICC.1988.13797","url":null,"abstract":"The use of optical signal processing and novel optical architectures in networks is discussed. Examples of three experimental all-optical passive star networks are presented: asynchronous code-division multiple-access (spread-spectrum), fixed-assignment (TDMA) time-division multiple-access (at 500 Mb/s) and a 12.5-Gb/s all-optical, self-routing, strictly nonblocking photonic switch. The feasibility of future photonic networks is also discussed. To reduce the bandwidth requirements of the receiver, it is necessary to perform the data regeneration process optically, using, for example, bistability or four-wave mixing. In CDMA, optical threshold detection of the autocorrelation peak is required, and in TDMA, optical coincidence of the delayed clock and the data is needed.<<ETX>>","PeriodicalId":191242,"journal":{"name":"IEEE International Conference on Communications, - Spanning the Universe.","volume":"62 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":"128531735","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 feedback adaptive variable rate meteor burst communication system 一种反馈自适应变速率流星突发通信系统
IEEE International Conference on Communications, - Spanning the Universe. Pub Date : 1988-06-12 DOI: 10.1109/ICC.1988.13603
S.S.L. Chang
{"title":"A feedback adaptive variable rate meteor burst communication system","authors":"S.S.L. Chang","doi":"10.1109/ICC.1988.13603","DOIUrl":"https://doi.org/10.1109/ICC.1988.13603","url":null,"abstract":"Meteor burst communication (MBC) channels are known for their intermittent nature and large variations of received signal power. For optimum utilization of such channels, a feedback adaptive variable rate (FAVR) system is proposed in which the transmitted bit rate is proportional to channel transmittance (or received signal power). Based on well accepted channel models for low-density meteor bursts, the expected improvement in throughput is significant: approximately five times that of constant-bit-rate systems, and ten times that of constant-bit-rate systems with ARQ (automatic-repeat request). The system adapts automatically to give optimum throughput for both high- and low-density bursts. Considering the occasional presence of high density bursts, the improvement of throughput over a constant rate system is even higher. Two other advantages are: (i) it requires minimum waiting time among MBC systems, and (ii) the transmitted bits can be readily formulated into packets with only minimal loss of the throughput rate. Thus the FAVR-MBC systems can be readily incorporated into any existing communication network.<<ETX>>","PeriodicalId":191242,"journal":{"name":"IEEE International Conference on Communications, - Spanning the Universe.","volume":"37 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":"129888260","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
High speed circuit technology for multi-gigabit/sec optical communication systems 多千兆/秒光通信系统的高速电路技术
IEEE International Conference on Communications, - Spanning the Universe. Pub Date : 1988-06-12 DOI: 10.1109/ICC.1988.13582
W. Way, J. Gimlett, K. Runge, D. Millicker, R.J. Standley, J. Young, N. Cheung
{"title":"High speed circuit technology for multi-gigabit/sec optical communication systems","authors":"W. Way, J. Gimlett, K. Runge, D. Millicker, R.J. Standley, J. Young, N. Cheung","doi":"10.1109/ICC.1988.13582","DOIUrl":"https://doi.org/10.1109/ICC.1988.13582","url":null,"abstract":"The authors discuss the design tradeoffs and experimental results for several multigigabit-per-second regenerator circuit components. To illustrate the roles of these circuits in optical communications, they describe the system integration of some of these components into a prototype 2.4 Gb/s regenerator. The performance of the regenerator was measured in conjunction with a 1300 nm high-speed laser diode and an InGaAs avalanche photodiode. The regenerator circuits are expected to find applications in high-speed direct-detection systems for broadband ISDN (integrated services digital network).<<ETX>>","PeriodicalId":191242,"journal":{"name":"IEEE International Conference on Communications, - Spanning the Universe.","volume":"61 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":"130299996","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
Soft decision decoding of block codes using received signal envelopes in fading channels 在衰落信道中利用接收信号包络实现分组码的软判决译码
IEEE International Conference on Communications, - Spanning the Universe. Pub Date : 1988-06-12 DOI: 10.1109/ICC.1988.13662
Tadashi Matsumoto
{"title":"Soft decision decoding of block codes using received signal envelopes in fading channels","authors":"Tadashi Matsumoto","doi":"10.1109/ICC.1988.13662","DOIUrl":"https://doi.org/10.1109/ICC.1988.13662","url":null,"abstract":"The word-error-rate (WER) performance of noncoherent FSK (frequency-shift keying) with soft-decision decoding of block codes using D. Chase's (1972) second algorithm is investigated in a Rayleigh fading channel. The received signal envelope is sampled and used as channel measurement information. The theoretical upper and lower bounds of the WER are derived assuming independent Rayleigh envelope samples in a received block. The effects of bit interleaving on the WER performance when fading envelope variation is slow compared with the bit rate are investigated through computer simulations. The theoretical analysis was supported by laboratory experiments.<<ETX>>","PeriodicalId":191242,"journal":{"name":"IEEE International Conference on Communications, - Spanning the Universe.","volume":"15 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":"123190527","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
Performance of convolutional codes with diversity under worst case partial-band noise jamming 部分频带噪声干扰下具有分集的卷积码的性能
IEEE International Conference on Communications, - Spanning the Universe. Pub Date : 1988-06-12 DOI: 10.1109/ICC.1988.13779
K. Cheun, W. Stark
{"title":"Performance of convolutional codes with diversity under worst case partial-band noise jamming","authors":"K. Cheun, W. Stark","doi":"10.1109/ICC.1988.13779","DOIUrl":"https://doi.org/10.1109/ICC.1988.13779","url":null,"abstract":"The performance of convolutional codes with diversity are analyzed under worst-case partial-band jamming. Various receiver structures and decoders that do not use any form of side information are considered and their performances are compared using Chernoff bounds. The performance of systems considered in the literature that use perfect side information are given for comparison purposes. It is shown that good robust soft metrics perform very close to square-law-combining metrics with perfect side information. The self-normalized metric performed especially well, with performance almost identical to that of the square-law-combining metric with perfect side information.<<ETX>>","PeriodicalId":191242,"journal":{"name":"IEEE International Conference on Communications, - Spanning the Universe.","volume":"23 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":"121512217","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
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