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Coding and modulation techniques for high speed data services by satellite 卫星高速数据业务的编码和调制技术
信息通信技术 Pub Date : 1997-09-09 DOI: 10.1109/ICICS.1997.647134
M. Rice, P. Gray, A. Barbulescu
{"title":"Coding and modulation techniques for high speed data services by satellite","authors":"M. Rice, P. Gray, A. Barbulescu","doi":"10.1109/ICICS.1997.647134","DOIUrl":"https://doi.org/10.1109/ICICS.1997.647134","url":null,"abstract":"Data traffic in satellite systems is likely to increase, similar to the trend in terrestrial systems. In particular, demand for high speed data services will increase. These new services require more power and bandwidth than is currently required for speech and low rate data/fax services. High order modulation schemes such as 8 PSK and 16 QAM, when combined with turbo coding provide a good solution in terms of both power and bandwidth efficiency. Moreover, the low operating signal to noise ratio (SNR) of such schemes increases their robustness to interference and distortion. Key issues such as delay, complexity and performance are discussed indicating that significant gains are possible for current and future high speed data services provided by satellite.","PeriodicalId":71361,"journal":{"name":"信息通信技术","volume":"7 1","pages":"435-438 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1997-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83086394","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: 11
Fast and accurate estimation of ATM quality of service parameters with applications to call admission control 快速准确估计ATM服务质量参数及其在呼叫接纳控制中的应用
信息通信技术 Pub Date : 1997-09-09 DOI: 10.1109/ICICS.1997.647118
Z. Fan, P. Mars
{"title":"Fast and accurate estimation of ATM quality of service parameters with applications to call admission control","authors":"Z. Fan, P. Mars","doi":"10.1109/ICICS.1997.647118","DOIUrl":"https://doi.org/10.1109/ICICS.1997.647118","url":null,"abstract":"We demonstrate how fast and accurate estimates of quality of service (QOS) parameters can be obtained for an ATM multiplexer queueing model fed by heterogeneous Markovian traffic sources. We achieve this by constructing a simple approximation of the buffer overflow probability: Pr(Q>B)/spl ap/De/sup -/spl theta/*B/, where /spl theta/* is the asymptotic decay rate of the tail of the distribution, and D is a prefactor obtained from the Bahadur-Rao theorem. Upper bounds on other QOS parameters, such as cell loss ratio, mean cell delay and cell delay variance, can all be derived from this estimate. It has been shown that this approximation is much more accurate than the pure effective bandwidth one Pr(Q>B)/spl ap/e/sup -/spl theta/*B/, which ignores the statistical multiplexing gain due to a large number of sources. One attraction of the proposed method is that the speed of computation of D and /spl theta/* is independent of the size of the system. Thus our analytical techniques can be implemented fast enough for real-time administration of admission control in ATM networks.","PeriodicalId":71361,"journal":{"name":"信息通信技术","volume":"19 1","pages":"351-356 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1997-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82406499","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
A user interface device for domestic hypermedia 用于国内超媒体的用户界面设备
信息通信技术 Pub Date : 1997-09-09 DOI: 10.1109/ICICS.1997.652280
H. Beadle, K. Ramli, A. Samouelian
{"title":"A user interface device for domestic hypermedia","authors":"H. Beadle, K. Ramli, A. Samouelian","doi":"10.1109/ICICS.1997.652280","DOIUrl":"https://doi.org/10.1109/ICICS.1997.652280","url":null,"abstract":"Traditional ways of interacting with hypermedia fail in a domestic setting because the user interaction devices typical of a desktop hypermedia system (mouse, keyboard, joystick, high resolution screen) are currently unavailable or are impractical in a domestic setting. We have investigated and prototyped an alternate interaction device based on a hand-held touchpad that we believe is practical in a domestic environment where people interact with hypermedia content for education and entertainment in a lounge room like setting. We have evaluated the usability level of the device in human trials and found that it performs better than keyboard-mouse combination, which is one of the most widely used interaction device today.","PeriodicalId":71361,"journal":{"name":"信息通信技术","volume":"82 5 1","pages":"1677-1681 vol.3"},"PeriodicalIF":0.0,"publicationDate":"1997-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89587083","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
A new estimation formula for minimum filter length of optimum FIR low-pass digital filters 提出了一种新的FIR低通数字滤波器最小滤波器长度估计公式
信息通信技术 Pub Date : 1997-09-09 DOI: 10.1109/ICICS.1997.652198
K. Ichige, K. Ueda, M. Iwaki, R. Ishii
{"title":"A new estimation formula for minimum filter length of optimum FIR low-pass digital filters","authors":"K. Ichige, K. Ueda, M. Iwaki, R. Ishii","doi":"10.1109/ICICS.1997.652198","DOIUrl":"https://doi.org/10.1109/ICICS.1997.652198","url":null,"abstract":"This paper presents an accurate estimation formula for the minimum filter length of optimum (the minimax criterion based) FIR low-pass digital filters when ripples in passband and those in stopband are identical. Two estimation formulae have been already proposed, but they have some problems which lead to wrong estimation. Discussing the problems based on both experimental results and theoretical considerations, we propose a new estimation formula. The accuracy of the proposed formula, is evaluated for some design examples and compared with that of the conventional formulae.","PeriodicalId":71361,"journal":{"name":"信息通信技术","volume":"10 1","pages":"1303-1307 vol.3"},"PeriodicalIF":0.0,"publicationDate":"1997-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87135429","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
Open architecture of accessing Internet and its content providers for the Web InfoShop Node Web InfoShop节点访问Internet及其内容提供者的开放式架构
信息通信技术 Pub Date : 1997-09-09 DOI: 10.1109/ICICS.1997.647075
Yong-Hoon Kim, Chang-Woo Yoon, Mi-Jung Yang, Dae-Ung Kim
{"title":"Open architecture of accessing Internet and its content providers for the Web InfoShop Node","authors":"Yong-Hoon Kim, Chang-Woo Yoon, Mi-Jung Yang, Dae-Ung Kim","doi":"10.1109/ICICS.1997.647075","DOIUrl":"https://doi.org/10.1109/ICICS.1997.647075","url":null,"abstract":"In order to use Internet services, the user should subscribe to an Internet service provider and content provider (CP). This procedure requires a monthly fixed sum of money for using the Internet and CP; this is a barrier to suppress the growth of Internet users. To promote high quality commercial Internet services, we must simplify the users' subscribing procedures and charging system. We designed and implemented the Web InfoShop Node (WiN) System. The WiN system has an open architecture for accessing the Internet and CP resources. The users of the WiN system can access the Internet and CP resources without a regular subscribing procedure. Additionally the WiN system can provide various services such as authentication resolution, billing agency and filtering of resources. In this paper, we describe the system configuration, the services provided, and the communication protocols of the WiN system.","PeriodicalId":71361,"journal":{"name":"信息通信技术","volume":"18 1","pages":"143-147 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1997-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88773880","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
Loosely coupled multimedia database management system 松耦合多媒体数据库管理系统
信息通信技术 Pub Date : 1997-09-09 DOI: 10.1109/ICICS.1997.647168
B. Paliwal, H. Diwakar, J. Jhala
{"title":"Loosely coupled multimedia database management system","authors":"B. Paliwal, H. Diwakar, J. Jhala","doi":"10.1109/ICICS.1997.647168","DOIUrl":"https://doi.org/10.1109/ICICS.1997.647168","url":null,"abstract":"Few commercially available RDBMSs provide multimedia support. Of the few which do, there is no standard way by means of which multimedia objects are supported. We have tried to use ODBC support for creating an application which supports multimedia objects loosely coupled to any RDBMS which may or may not support multi-media objects. The multi-media objects are stored on a file system distributed over the network and the application developed handles issues like concurrency, integrity and recovery. This loosely coupled approach allows the independent existence of the RDBMS, solves the problem of storage of large amounts of multimedia data by providing a file system that is distributed across nodes of a network.","PeriodicalId":71361,"journal":{"name":"信息通信技术","volume":"59 1","pages":"593-595 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1997-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87420694","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
Equivalent bandwidth of VBR video traffic VBR视频流量的等效带宽
信息通信技术 Pub Date : 1997-09-09 DOI: 10.1109/ICICS.1997.652268
Qian Wang, C.K. Liu, K. Li
{"title":"Equivalent bandwidth of VBR video traffic","authors":"Qian Wang, C.K. Liu, K. Li","doi":"10.1109/ICICS.1997.652268","DOIUrl":"https://doi.org/10.1109/ICICS.1997.652268","url":null,"abstract":"The B-ISDN is designed to support various classes of traffic. Traffic with wide range of bandwidth, delay, loss requirements are expected to be carried by the network and match the expected grade of service (GoS). The inherent problems of large bandwidth, bursty and real-time requirements of variable bit rate (VBR) have attracted attentions of researchers in the past. We propose an equivalent bandwidth estimation algorithm for VBR video traffic. Our approach combines the statistical attributes, GoS requirements and network resources parameters to provide an integrated measure. This algorithm is computational simple, accurate and robust.","PeriodicalId":71361,"journal":{"name":"信息通信技术","volume":"42 1","pages":"1618-1622 vol.3"},"PeriodicalIF":0.0,"publicationDate":"1997-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89856005","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
The generation of waveform fluctuation for the enhancement of the quality of sustained vowels 波形波动的产生是为了提高持续元音的质量
信息通信技术 Pub Date : 1997-09-09 DOI: 10.1109/ICICS.1997.652130
N. Aoki, T. Ifukube
{"title":"The generation of waveform fluctuation for the enhancement of the quality of sustained vowels","authors":"N. Aoki, T. Ifukube","doi":"10.1109/ICICS.1997.652130","DOIUrl":"https://doi.org/10.1109/ICICS.1997.652130","url":null,"abstract":"It is indicated that the pitch-synchronous subtle waveform fluctuations of sustained vowels are the acoustic cue for the naturalness in case the sustained vowels do not include fundamental frequency fluctuations. From the viewpoint of speech synthesis, it is expected that the more naturally sounding sustained vowels can be synthesized by incorporating the appropriately modeled waveform fluctuations. In this study, the waveform fluctuations of the inverse-filtered normal sustained vowels were analyzed with the aim of high quality speech synthesis. The series of the analyses suggested that the waveform fluctuations could be modeled by the same rule for all speech samples obtained from ten male subjects. In addition, the psychoacoustic experiments confirmed the validity of the method which generates the completely artificial waveform fluctuations for the remarkable enhancement of the quality of sustained vowels.","PeriodicalId":71361,"journal":{"name":"信息通信技术","volume":"21 1","pages":"998-1002 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1997-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90201517","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
A new multiuser detector for CDMA signals over frequency-selective fading channels with narrowband interference 一种用于窄带干扰下频率选择性衰落信道CDMA信号的新型多用户检测器
信息通信技术 Pub Date : 1997-09-09 DOI: 10.1109/ICICS.1997.652099
S. Buzzi, M. Lops, A. Ragozini
{"title":"A new multiuser detector for CDMA signals over frequency-selective fading channels with narrowband interference","authors":"S. Buzzi, M. Lops, A. Ragozini","doi":"10.1109/ICICS.1997.652099","DOIUrl":"https://doi.org/10.1109/ICICS.1997.652099","url":null,"abstract":"In this paper we derive a new suboptimum multiuser receiver for CDMA signals in the presence of frequency-selective fading and narrowband interference. The proposed detector, which can be interpreted as a generalization of the decorrelating detector, achieves interference cancellation by projecting the received signal onto the orthogonal complement of the subspace spanned by the narrowband and multiaccess interference. As to the performance, we consider the case of Rayleigh-fading channel, showing that the new receiver largely outperforms the conventional decorrelating detector, especially in the presence of strong narrowband interferers, at the price of a little additional loss as no narrowband interference is active.","PeriodicalId":71361,"journal":{"name":"信息通信技术","volume":"119 6 1","pages":"849-853 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1997-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90247347","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
Performance of multichannel CSMA networks 多通道CSMA网络的性能
信息通信技术 Pub Date : 1997-09-09 DOI: 10.1109/ICICS.1997.652140
F. Lo, T. Ng, T. I. Yuk
{"title":"Performance of multichannel CSMA networks","authors":"F. Lo, T. Ng, T. I. Yuk","doi":"10.1109/ICICS.1997.652140","DOIUrl":"https://doi.org/10.1109/ICICS.1997.652140","url":null,"abstract":"Channel sense multiple access with collision detection (CSMA/CD) is a very simple and efficient way of allowing many stations to transmit messages to a central server down a shared channel. In wireless networks, however, collision detection is difficult to implement, and in such cases CSMA alone may have to be used. It is shown that a multichannel CSMA network can be almost as efficient in utilizing the bandwidth available to the network as an equivalent single channel CSMA/CD network. Furthermore, multichannel CSMA networks provide better throughput and delay performance than equivalent single channel CSMA systems, even when the message generation probability and the number of stations in the network are varied.","PeriodicalId":71361,"journal":{"name":"信息通信技术","volume":"2 1","pages":"1045-1049 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1997-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82170084","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: 9
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