IEEE International Conference on Communications, World Prosperity Through Communications,

11-14 June 1989

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  • IEEE International Conference on Communications. BOSTONICC/89. World Prosperity Through Communications (Cat. No.89CH2655-9)

    Publication Year: 1989
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    Freely Available from IEEE
  • Immediate recognition of signals in simultaneous transmission of voice and high speed data

    Publication Year: 1989, Page(s):966 - 970 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (382 KB)

    An approach to immediate and accurate discrimination between speech and baseband data signals for achieving effective transmission of baseband data during silences in a telephone conversation, is described. The method is based on the use of control words delimiting each signal to be multiplexed. Guidelines for choosing such control words are provided and suitable techniques for solving any transpa... View full abstract»

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  • Design of robust adaptive equalizers for digital radio systems

    Publication Year: 1989, Page(s):1037 - 1042 vol.2
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (519 KB)

    The issue of adaptive equalizer behavior during the events of carrier synchronism loss in digital microwave radio systems is addressed. It is shown that, in the case of a QPSK system, conventional algorithms are very sensitive to carrier synchronism loss, and that a simple modification considerably improves their stability. Next, a 64-QAM system is considered, and the conventional zero-forcing alg... View full abstract»

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  • Memory administration data model for the integrated services digital network (ISDN)

    Publication Year: 1989, Page(s):54 - 57 vol.1
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    Methods to minimize the complexity caused by the number of different switch suppliers that provide a variety of nonstandard integrated services digital network (ISDN) subscription parameters are proposed. A methodology is presented for using database concepts to represent customer subscription data and the messages that pass between a memory administration operations system and the ISDN switch to ... View full abstract»

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  • An expert system approach for maintenance support of EWSD switches

    Publication Year: 1989, Page(s):1433 - 1437 vol.3
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    In January 1987, the University of Karlsruhe and Siemens started a joint research project on expert system application for supporting digital switch maintenance. Major results of the first project phase are summarized. Maintenance phases supported by an expert system are defined. Expert system technology is used to help technicians to handle alarms of the Siemens digital switching system EWSD corr... View full abstract»

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  • ISDN operations objectives and their implementation for loop maintenance

    Publication Year: 1989, Page(s):48 - 53 vol.1
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    A set of goals for integrated services digital network (ISDN) operations support and their rationale are described, and specific implementations of these goals to support basic rate interface (BRI) services and equipment are presented. Most of the goals described are also applicable to primary rate interface (PRI). Goals to guide the development of operations systems (OSs) for ISDN are to support ... View full abstract»

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  • An expert system for the management of the Italian public packet-switched network

    Publication Year: 1989, Page(s):1428 - 1432 vol.3
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    The authors present a prototype network management system designed to monitor and control the Italian public packet-switched network (Itapac). This system, called the Itapac Assistance System (IAS), was designed to ease and improve the actions carried out by the network operators. The heart of IAS is an expert system which implements the network management knowledge provided by the experts and use... View full abstract»

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  • Controlled carrier operation in a memory based echo cancelling data set

    Publication Year: 1989, Page(s):254 - 260 vol.1
    Cited by:  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    The author describes three methods used to achieve controlled carrier with different echo-canceling techniques and introduces a technique used in a memory-based echo canceler. Packetizing the data, special data patterns, and transversal filter structure are discussed as ways of implementing controlled carrier in echo cancelers. A block diagram of controlled carrier implementation in a memory-based... View full abstract»

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  • Operations support for ISDN protocol maintenance

    Publication Year: 1989, Page(s):43 - 47 vol.1
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    Some of Ameritech's experience with early integrated services digital network (ISDN) trials and the associated protocol analysis problems are discussed. Some possible test set and systems solutions that address these needs are also discussed. The requirements for a portable test set to support preservice testing and maintenance of ISDN lines are given, and the need to develop some method of gettin... View full abstract»

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  • Performance modeling of multi-layered OSI communication architectures

    Publication Year: 1989, Page(s):651 - 657 vol.2
    Cited by:  Papers (7)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (720 KB)

    A generic queueing network model is formulated for an analytical performance evaluation of communications networks which are layered according to the OSI reference model. The proposed model, based directly on the generic specifications of the reference model, may be used to quantitatively evaluate end-to-end mean performance measures taking into account multiple layers of protocol, a multitude of ... View full abstract»

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  • An application of statistically based temporal reasoning to an expert system performing central office hardware fault diagnosis and isolation

    Publication Year: 1989, Page(s):1423 - 1427 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    A method for the utilization of statistically based temporal reasoning is examined. An expert system used for the diagnosis of central office telephone switching systems is used as the application environment. Further, a discussion of the different classes of problems that such approaches can effectively address is presented. Problems involving the hardware maintenance of any system may fall withi... View full abstract»

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  • Improved data predistortion using intersymbol interpolation

    Publication Year: 1989, Page(s):286 - 291 vol.1
    Cited by:  Papers (4)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    An efficient data predistortion technique is presented to compensate for transmitter high-power amplifier (HPA) nonlinearities in digital microwave radio systems employing quadrature amplitude modulation (QAM) signal formats. The proposed technique makes use of a specific transmitter pulse shaping that leads to discrete signal levels at time instants spaced by half a symbol interval. The predistor... View full abstract»

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  • A new configuration for jointly adaptive cancellation of echo and ISI in voiceband data transmission systems

    Publication Year: 1989, Page(s):249 - 253 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    The authors develop a model in which echo and intersymbol interference (ISI) can be eliminated simultaneously. The features of the proposed model include: (1) low-complexity echo cancellation with faster convergence than the traditional configuration, the number of multiplications and tap coefficients required being between 25% and 37.5% and 16.7% and 25%, respectively, of those of the traditional... View full abstract»

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  • Subcarrier multiplexed lightwave networks for broadband distribution

    Publication Year: 1989, Page(s):982 - 986 vol.2
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    Two approaches are analyzed for building low-cost subscriber distribution networks which serve many subscribers from a single transmitter and feeder. In a completely passive optical network, it is shown that 16 to 32 subscribers can be served from a single feeder. In a second approach using optical amplifiers, it is shown that several stages of amplification can be used, and that 16 to 32 subscrib... View full abstract»

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  • A personal computer prototype to support ISDN service negotiations

    Publication Year: 1989, Page(s):38 - 42 vol.1
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    Experience with a prototype service negotiation system for the integrated services digital network (ISDN) is presented. A commercially available database management system and high-level application language (dBASE III PLUS Version 1.1) were used as the platform on which to build the system. The user-system dialogue chosen for the prototype is a combination of menus and fill-in forms. The prototyp... View full abstract»

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  • Performance analysis of a LAN/WAN bridging architecture

    Publication Year: 1989, Page(s):646 - 650 vol.2
    Cited by:  Papers (2)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    A performance analysis of a virtual-circuit-based wide-area network (WAN) that performs local-area-network (LAN) bridging is presented. This type of WAN is suitable for LAN bridging because the conversion of functions between the LAN protocol and the WAN protocol can be simplified by assigning a virtual circuit to each bridge-to-bridge (edge-to-edge) connection. With this architecture, routing is ... View full abstract»

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  • QFD: a method for guaranteeing communication of the customer voice through the whole product development cycle

    Publication Year: 1989, Page(s):1329 - 1333 vol.3
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    The authors briefly describes the program that HP's (Hewlett-Packard's) Corporate Quality Department is putting in place to promote the use of QFD (quality function deployment) in new product development. Capsule accounts are given of several HP projects that have used elements of QFD. Lessons learned about the accelerating factors and the pitfalls in implementing QFD are presented View full abstract»

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  • MICE: a facility maintenance expert system

    Publication Year: 1989, Page(s):1418 - 1422 vol.3
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    The authors describe the metropolitan inter-office carrier expert (MICE), an expert system that pinpoints the cause of chronic digital carrier failures. Since different carrier equipment types are monitored by different operations systems, which are viewed by separate maintenance centers, carrier alarms caused by a single problem appear unrelated and are redundantly pursued. The authors discovered... View full abstract»

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  • Scheduling in SS/TDMA systems with intersatellite links

    Publication Year: 1989, Page(s):515 - 519 vol.1
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    An approach is presented for the optimal time slot assignment problem of a general satellite-switched time-division-multiple-access (SS/TDMA) satellite system interconnected through intersatellite links. An arbitrary number of satellites in the network, arbitrary interconnection through the intersatellite links, and arbitrary ISL propagation delay are considered. In addition, each satellite may co... View full abstract»

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  • Application of generalized parallel delta networks to a hybrid broadband switch

    Publication Year: 1989, Page(s):123 - 127 vol.1
    Cited by:  Papers (3)  |  Patents (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    The authors describe a broadband switch architecture that is able to offer both the asynchronous and the circuit emulation transfer modes (ATM and CEM) for nonisochronous and isochronous services, respectively. The switch is based on the generalized parallel delta network (GPDN) and operates according to the cut-through technique. The rearrangeability and the self-routing properties of GPDNs ensur... View full abstract»

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  • Performance of M-algorithm MLSE equalizers in frequency-selective fading mobile radio channels

    Publication Year: 1989, Page(s):281 - 285 vol.1
    Cited by:  Papers (13)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    The performance loss of an adaptive M-algorithm maximum likelihood sequence estimation (MLSE) equalizer system is presented for frequency-selective fading mobile ratio channels, assuming a two-ray and a six-ray multipath fading model. The use of a computer simulation of a time division multiple access (TDMA) digital mobile radio link demonstrates that the M-algorithm can be subst... View full abstract»

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  • Vector quantization using image adaptive codebook

    Publication Year: 1989, Page(s):1350 - 1354 vol.3
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    The authors present vector quantization using image adaptive codebook (VQIAC), an image adaptive vector-quantization technique where the codebook generated from the input image is encoded by using variable-length transform coding (VLTC). It is shown experimentally that VQIAC-VLTC is competitive with both vector quantization using a universal codebook and the conventional VLTC operating on the orig... View full abstract»

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  • Performance of meteor burst communication using variable data rates

    Publication Year: 1989, Page(s):1119 - 1123 vol.2
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    The performance of a meteor-burst (MB) communication system is analyzed. The message to be transmitted consists of a number of packets, and the data rate is varied as a function of the channel state in order to maintain an approximately constant bit error rate (BER). The message is assumed to be repeated an indefinite number of times. The quantity of interest is the probability that the message wi... View full abstract»

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  • Adaptive recursive LK transversal algorithms for data echo cancellation applications

    Publication Year: 1989, Page(s):244 - 248 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    A family of adaptive transversal algorithms for data echo cancellation applications in full-duplex data transmissions is described. This family of algorithms (RLK algorithms) is a generalization of the classical recursive least square (RLS) algorithm, where K=1. The convergence behavior of the RLK algorithms is analyzed, and it displays a strong dependence on the noise statistics. For cer... View full abstract»

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  • Detection of modem type and bit rate of FSK voiceband and data signals

    Publication Year: 1989, Page(s):1101 - 1105 vol.2
    Cited by:  Papers (3)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    A classification scheme to detect the modem type (e.g., 202, V.23, 103, and V.21) and bit rate (e.g., 1800, 1200, 600, 300, and 75 b/s) of frequency-shift-keyed (FSK) voice band data signals is presented. The discrimination technique is based upon simple second-order statistical parameters of the instantaneous frequency of the input signal. Good performance of the discriminator is obtained even in... View full abstract»

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