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Communication Technology Proceedings, 1996. ICCT'96., 1996 International Conference on

5-7 May 1996

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Displaying Results 1 - 25 of 128
  • Author index

    Publication Year: 1996
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    Freely Available from IEEE
  • On updating the singular value decomposition

    Publication Year: 1996, Page(s):675 - 678 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (389 KB)

    In this paper, a new technique for updating the SVD is described. It starts from the fact that the SVD can be reduced to a corresponding symmetric eigenvalue problem and utilizes an efficient eigensystem solver, called the GMRQI-JKL, to update the SVD. Based on the updating technique, a parallel and recursive total least squares algorithm (PRTLS) for solving a time variant TLS problem is proposed.... View full abstract»

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  • A supervisory control theoretical approach to congestion management

    Publication Year: 1996, Page(s):857 - 861 vol.2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (580 KB)

    This paper presents a supervisory control theoretical approach to congestion management in virtual circuit networks. The network behavior is considered as a dynamic discrete-event system (DES). Then, a synthesis algorithm is applied to derive a supervisor that restricts network operation to avoid congestion. In our approach, a colored Petri net (CP-net) is used to model a network, an equivalence r... View full abstract»

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  • Delay-throughput comparison of single and multi-channel slotted ALOHA networks

    Publication Year: 1996, Page(s):934 - 937 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    In networks where stations are equally likely to transmit to one another, simple slotted ALOHA is not an appropriate form of multiple access protocol as messages meant for different stations can collide in the common channel. In this paper the performance of a single channel slotted ALOHA network is compared to that of a CDMA ALOHA network where each station is assigned a different spreading code ... View full abstract»

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  • A novel hybrid CCMA/SSMA scheme

    Publication Year: 1996, Page(s):930 - 933 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    A novel hybrid collaborative coding multiple access/spread spectrum multiple access (CCMA/SSMA) coding scheme which is superior to the individual CCMA scheme or SSMA scheme in terms of information rate, number of users, decoding complexity and external interference rejection capability, is proposed. The new hybrid coding scheme provides a very flexible and powerful multiple access capability and a... View full abstract»

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  • Coherent demodulation of chaos shift keying

    Publication Year: 1996, Page(s):926 - 929 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    Stimulated by the fascinating chaotic synchronization principle proposed by Pecora and Carroll (1991) chaotic communications have recently aroused much interest in the area of secure communications because of the stochastic and complicated behavior of chaotic signals. In this paper, coherent demodulation of chaos shift keying (CSK) using Lorenz-based chaotic circuits is proposed. We prove the sync... View full abstract»

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  • Commercialization of PACS in the south-east Asia

    Publication Year: 1996, Page(s):849 - 852 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (268 KB)

    We first examine the existing wireless services in south-east Asia and present our view of suitable communications services for this region. The major technical parameters of the Personal Access Communications System (PACS) are reviewed. Suitable applications and the key benefits of deploying PACS in this region are identified. The PACS trial activities and industry support of the PACS from major ... View full abstract»

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  • A blind equalizer based on nonlinear dynamics neural networks

    Publication Year: 1996, Page(s):920 - 925 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    Based on nonlinear dynamics theory, this article presents an artificial neural network (ANN) blind equalizer associated with its nonlinear dynamic equation and its stability conditions. Simulation results indicate that this ANN blind equalizer has a very strong tolerance of and adaptation to the time-varying high speed channel. The bit rate of its equalized channel can be as high as 10 Gbps View full abstract»

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  • A new WDM random access control protocol in LAN

    Publication Year: 1996, Page(s):615 - 618 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    The lightwave network is introduced to exploit the huge optical bandwidth with concurrency among multiple-user transmissions in the network architectures and protocols. Receiver collision is a common problem in a single-hop WDM network with random access control protocols. This paper proposes an RRC protocol (reduced receiver collision) with waiting-queue and channel-usage table. It has been shown... View full abstract»

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  • Code phase assignment DS/CDMA communications for indoor wireless Rician multipath fading channels

    Publication Year: 1996, Page(s):1106 - 1109 vol.2
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    The technique of using a single basic signature sequence for the DS/CDMA system was investigated. All users have their sequences differing by cyclic phase shifts from a basic signature sequence. The technique is called code phase assignment (CPA). Yip and Ng (see IEEE/VTS 44th Vehicular Technology Conference, vol.3, p.1586, 1994), have shown that the CPA DS/CDMA technique yielded better performanc... View full abstract»

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  • CPCT performance analysis

    Publication Year: 1996, Page(s):879 - 883 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    The paper presents the China Digital Cordless Telecommunications (CDCT) system and its characteristics. We analyze its queuing model and focus on discussing the call setup time and the data distribution time. The key point related with the CDCT network performance is the time require for database inquiry and updating. The connection setup strategy of the air interface and the means of transmission... View full abstract»

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  • Personal Access Communications System in Taiwan

    Publication Year: 1996, Page(s):845 - 848 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    The Personal Access Communications System (PACS) has been selected as one of the most promising low-tier PCS systems by the Directorate General of Telecommunications (DGT) of Taiwan. This paper reports the status of the PACS development in Taiwan. The PACS trial plan and major R&D efforts as well as the environment of wireless services are described View full abstract»

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  • Performance analysis of an ATM cell multiplexer with MMPP input and a neural connection admission control approach

    Publication Year: 1996, Page(s):916 - 919 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    ATM will be used to implement the BISDN. Because the cells of individual calls are combined in a statistical fashion, congestion may occur at multiplexers and switches in ATM networks. Understanding the queueing behaviour and the cell loss performance of ATM networks is very important for switch design, buffer dimensioning, and developing congestion control strategies. We study the performance of ... View full abstract»

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  • A new hybrid random/token access protocol for high speed LANs

    Publication Year: 1996, Page(s):611 - 614 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    A new hybrid system implemented on a dual unidirectional bus is described. By utilizing the implicit positional ordering of stations on a unidirectional bus, the proposed system switches between the random access mode (essentially CSMA/CD) and the implicit token passing mode without unnecessary delay. Therefore, unlike other hybrid systems such as Buzz-net and Z-net the proposed MAC does not show ... View full abstract»

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  • A reduced state Viterbi algorithm for multiuser detection in DS/CDMA systems

    Publication Year: 1996, Page(s):1102 - 1105 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    Code division multiple access (CDMA) has attracted considerable attention in digital cellular mobile and personal communications. We propose a novel multiuser detector based on the reduced state Viterbi algorithm. It partitions the total K users into G groups according to their power strengths and interference levels, which reduces the computational complexity per binary decision from O(2K-1<... View full abstract»

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  • Analysis of a slotted access channel with average cycle method

    Publication Year: 1996, Page(s):1080 - 1083 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    Random access techniques in the packet broadcasting environment are a very important research topic. A broadcast channel is a radio packet communication channel, and the relative distances between the users and the receiver can vary greatly. Thus, packets from different transmitters arrive at the receiver with substantially different power levels. These phenomena give rise to a capture effect at t... View full abstract»

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  • Network 3-dimensional analysis for communication system

    Publication Year: 1996, Page(s):706 - 709 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (152 KB)

    Studying artificial networks is one of the most basic problems in artificial communication systems. It is important for saving time in computer operations. Instead of 2-D analysis, we can simplify the problem. Much less time is needed to solve this problem on computers by 3-D matrices View full abstract»

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  • Multimedia and multiparty control: the intelligent network solution

    Publication Year: 1996, Page(s):875 - 878 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (412 KB)

    New telecommunication architectures must support advanced multimedia and multiparty services. Our work is based on the extension of the intelligent network control to support an advanced videoconference service. In order to cope with the increasing complexity of telecommunication services it becomes necessary to define basic components within these services. These components can be regarded as the... View full abstract»

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  • Sojourn time analysis for constant-bit-rate services in the ATM DQDB MAN

    Publication Year: 1996, Page(s):638 - 642 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    The sojourn time of the constant-bit-rate (CBR) services in the ATM DQDB MAN is studied. The ATM DQDB MAN transfers any kind of services in an unified manner with CBR services obtaining the higher priority level and the variable-bit-rate (VBR) services obtaining the lower priority level. The results display that the delay performance of the CBR services is satisfactory in the ATM DQDB MAN if the n... View full abstract»

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  • Blind equalization and its application to the PACS system

    Publication Year: 1996, Page(s):841 - 844 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    High speed data transmission has become an important issue in mobile wireless communications. However, multipath propagation in wireless channels causes dispersion of the transmitted signals. We present a strategy to equalize the short burst without using a training sequence. This method is suitable for low-overhead TDMA systems such as PACS whose frame is very short. Different kinds of blind equa... View full abstract»

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  • The study of an ATM switching architecture controlled by neural network

    Publication Year: 1996, Page(s):913 - 915 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (168 KB)

    This paper points out the disadvantages of Banyan communication network switching realized by using usual bidirectional associative memories (BAM) neural network, and presents a method for realizing Banyan communication network switching by using adaptive and asymmetric BAM, i.e. AABAM neural network. The empirical results have shown that the new architecture is more adaptive to many arbitrary inp... View full abstract»

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  • Broadband network system toward the 21th century

    Publication Year: 1996, Page(s):973 - 976 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    Broadband communications have a great impact on network architecture. ATM is becoming a key technology for networking infrastructure of a whole range of communications from legacy telephone networks to broadband integrated services digital network (B-ISDN). This paper describes Hitachi's view of network systems architecture toward the 21th century. Based on this concept, we introduce our network t... View full abstract»

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  • An improved algorithm for generating sum of disjoint products

    Publication Year: 1996, Page(s):719 - 722 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    Both the ALR (Abraham-Locks revised) and ALW minimizing algorithms are efficient systematic procedures for obtaining nearly minimal SDP system reliability formulas for coherent source-to-terminal networks. These two procedures differ only in the manner in which the minimal paths of the system are ordered, but are the same in all other respects. This paper presents an improved algorithm, based on A... View full abstract»

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  • Motion estimation in DCT domain

    Publication Year: 1996, Page(s):670 - 674 vol.2
    Cited by:  Papers (2)  |  Patents (23)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    In this paper, a new block matching criterion is proposed for motion estimation in video coding. The new criterion is based on a comparison between the discrete cosine transform (DCT) coefficients of two blocks to be matched. Since the spectrum of DCT statistically concentrates on the neighborhood of the dc component and the number of non-zero coefficients is quite small, only few coefficients nee... View full abstract»

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  • CDMA communication system with trellis coding and orthogonal signaling

    Publication Year: 1996, Page(s):1098 - 1101 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (220 KB)

    We discuss the application of trellis coding in a (direct sequence spread spectrum) CDMA system where orthogonal signaling is used. Our approach is to construct the trellis codes over the set of biorthogonal sequences. A general analysis is presented. We compared the analysis with computer simulation. The results show that the trellis coded CDMA system outperforms the corresponding uncoded DS/SSMA... View full abstract»

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