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IEEE Transactions on Communications

Issue 10 • October 1981

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Displaying Results 1 - 24 of 24
  • [Front cover and table of contents]

    Publication Year: 1981, Page(s): 0
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    Freely Available from IEEE
  • Guest Editors' Prologue

    Publication Year: 1981, Page(s):1413 - 1414
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    Freely Available from IEEE
  • Maintenance, Control, and Protection of Remote Electronics - An Overview

    Publication Year: 1981, Page(s):1415 - 1418
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    The various aspects of centralized maintenance, control, and protection of local exchange telecommunications systems are discussed. Issues of organization and planning, testing access and methods, protection switching, and computer system support are dealt with. Trends and their driving forces are also discussed. View full abstract»

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  • TDM Versus SDM Switching Arrays - Comparison

    Publication Year: 1981, Page(s):1455 - 1464
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (791 KB)

    In the first paper at the 9th ITC [8], PCM (TDM) switching arrays having up to six stages and up to about 100 000 terminations were investigated with regard to their standardized costs per termination as a function of the cost ratio "gate to memory-bit." In this context, the following were considered: the influence of the number and sequence of stages (T-stages,S-stages), the... View full abstract»

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  • Simulations of Convolutional Coding/Viterbi Decoding with Noncoherent CPFSK

    Publication Year: 1981, Page(s):1522 - 1526
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (494 KB)

    Simulation results are presented for the bit error rate performance of binary and quaternary noncoherent CPFSK when used in conjunction withK=7,R=1/2convolutional encoding and Viterbi decoding. Although coding does not appear to offer any significant advantage in the binary case, the results indicate that the quaternary CPFSK modulation with three-symbol demodulation is a goo... View full abstract»

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  • Comments on "Optimization of the Processing Gain of an M-ary Direct Sequence Spread Spectrum Communication System"

    Publication Year: 1981, Page(s):1548 - 1549
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (239 KB)

    First Page of the Article
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  • Author's reply

    Publication Year: 1981, Page(s): 1549
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (133 KB)

    First Page of the Article
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  • [Back cover]

    Publication Year: 1981, Page(s): 0
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    Freely Available from IEEE
  • Control and Supervision of Remote Line Units

    Publication Year: 1981, Page(s):1429 - 1433
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    The ITT 1210 Class 5 digital switching system has a distributed control architecture with inherent remote line switching capability. A unique common channel signaling scheme permits control and supervision of these remote units. Testing and maintenance capabilities are, in general, identical and equivalent to those available in the 1210 host office. The Technical Assistance Center provides an extr... View full abstract»

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  • Maintenance Capabilities of a Pair Gain System on Fiber

    Publication Year: 1981, Page(s):1442 - 1445
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    A Bell System nonstandard configuration of a pair gain system and a fiber optic system has demonstrated the usefulness of a remote maintenance plan. Combining two transmission systems in a way neither was originally designed for, this application required some special engineering to ensure the best possible service to customers. View full abstract»

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  • A Conditional Incremental-Runlength Code Based on Two-Dimensional Markov Model

    Publication Year: 1981, Page(s):1527 - 1532
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    The conditional runlength code is known to be optimum for the Markov source model, but it is complicated in implementation and not efficient for practical line-based transmission. To avoid these disadvantages, a conditional incremental-runlength coding algorithm based on the same model is investigated. The entropy of the incremental runs is shown to be less than that of the runs, but additional in... View full abstract»

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  • A Stripline-Implemented Baseband Signal Processor for Data and Clock Regeneration of PQM

    Publication Year: 1981, Page(s):1532 - 1537
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (600 KB)

    A baseband signal processor for 1 Gbit/s pulse quaternary modulation (PQM), a pulse modulation format, has been developed and tested. A coupled stripline network is implemented for signal formatting, along with a frequency/phase tracking pulse demultiplexer which reduces predetection bandwidth and interpulse interference. Measured BER performance is presented along with computer simulation predict... View full abstract»

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  • Blocking in a Shared Resource Environment

    Publication Year: 1981, Page(s):1474 - 1481
    Cited by:  Papers (581)  |  Patents (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    In recent years, considerable effort has focused on evaluating the blocking experienced by "customers" in contending for a commonly shared "resource." The customers and resource in question have typically been messages and storage space in message storage applications or data streams and bandwidth in data multiplexing applications. The model employed in these studies, a multidimensional generaliza... View full abstract»

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  • A Note on the Complexity of the Star-Star Concentrator Problem

    Publication Year: 1981, Page(s):1549 - 1552
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    The star-star concentrator problem (SSCP) arises in computer network design. The complexity of this problem is studied, and polynomially solvable and (strongly) NP-complete cases are presented. View full abstract»

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  • Loop Test System: A New Maintenance Feature for the Distributed Integrated Digital Network

    Publication Year: 1981, Page(s):1419 - 1428
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1104 KB)

    The introduction of the digital Class 5 switch offers unique solutions to the requirements of growth and demands for improved service. For example, remote subscriber switches (RSS's) and subscriber carrier terminals (SCT's) can now be located near subscribers and digitally connected to the Class 5 switch via T1 repeatered lines or radio links. The result is shorter subscriber loops, improved trans... View full abstract»

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  • Optimal Digital Switching Introduction Into the Local Network

    Publication Year: 1981, Page(s):1446 - 1454
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (984 KB)

    This paper describes a local network evolution model for digital switching introduction and the associated algorithm used to determine a feasible optimal network evolution policy. Such a policy is defined by the type, location, and time of placement of digital switches and remote concentrators as well as the homing pattern, i.e., the assignment of concentrators to digital switches. In addition, th... View full abstract»

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  • Adaptive Equalization Via Fast Quantized-State Methods

    Publication Year: 1981, Page(s):1492 - 1501
    Cited by:  Papers (11)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (944 KB)

    In adaptive equalization, there is a tradeoff between convergence rate of the equalizer tap coefficients, the computational speed for each adjustment, the implementation complexity, and algorithm robustness. Parameter update schemes called quantized state (QS) schemes, and fast versions of these schemes termed fast quantized state (FQS) schemes developed within a related context, are here applied ... View full abstract»

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  • Gray Code Generation for MPSK Signals

    Publication Year: 1981, Page(s):1519 - 1522
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    Presented here are techniques for generating desired gray codes with properties different from those of the standard binary reflected gray code. For communications using phase shift-keyed (PSK) signals with different significances for different phases, it is desirable to have such codes with different bit error probabilities. For some applications, it is important to have codes with arbitrary cros... View full abstract»

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  • 90 Mbit/s Digital Performance of Canada's 14/12 GHz ANIK C Earth Stations

    Publication Year: 1981, Page(s):1502 - 1513
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1296 KB)

    The design and performance aspects of Canada's first commercial 14/12 GHz ANIK C earth stations are reviewed, with particular reference to the satellite link degradations of the 90 Mbit/s digital message service. Following design considerations based on computer simulations, extensive test data are presented with respect to BER, jitter, and other performance characteristics of the loop closed via.... View full abstract»

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  • Local-Area Subnetworks: A Performance Comparison

    Publication Year: 1981, Page(s):1465 - 1473
    Cited by:  Papers (251)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (912 KB)

    This paper provides a comparative evaluation of the performance of ring and bus systems constituting subnetworks of local-area networks. Performance is measured in terms of the delaythroughput characteristics. Systems investigated include token-controlled and slotted rings as well as random-access buses (CSMA with collision detection) and ordered-access buses. The investigation is based on analyti... View full abstract»

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  • Intermodulation Effects in the Transmission of Voice-Activated SCPC/FM Carriers Through a Nonlinear Repeater

    Publication Year: 1981, Page(s):1537 - 1547
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (816 KB)

    When several voice-activated SCPC/FM carriers are transmitted through a nonlinear satellite repeater, a large number of intermodulation products appear at the output. An analysis of the baseband effect of these products is presented, taking into account the random on-off pattern followed by each carrier, the random nature of the level of each modulating speech signal, and a precise definition of t... View full abstract»

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  • Subscriber Line Testing for Digital Switching Offices

    Publication Year: 1981, Page(s):1434 - 1441
    Cited by:  Papers (2)  |  Patents (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (832 KB)

    This paper presents an overview of subscriber line testing as provided in Northern Telecom's Digital World®family of host and remote digital switching systems. Capabilities provided in Digital World satisfy the major telco needs related to subscriber line testing. The various products incorporate interfaces to external test systems as well as internal line test facilities. A new su... View full abstract»

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  • Forward Error Correction for an ARQ Scheme

    Publication Year: 1981, Page(s):1514 - 1519
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (576 KB)

    This paper examines the use of BCH error-correcting codes in improving the performance of a stop-and-wait automatic repeat-request (ARQ) scheme over random error and Rayleigh fading channels. Two models are analyzed. The first model considers the effect of forward error correction on the mean wasted time per message. The second model assumes a Poisson arrival process for the messages and examines ... View full abstract»

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  • Communication Network Availability Predictions Based on Measurement Data

    Publication Year: 1981, Page(s):1482 - 1491
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1056 KB)

    Published data describing the probability distributions of data communication system reliability parameters such as availability are very sparse. This paper describes a set of data collected in order to model communication line availability by monitoring operational communication systems. Probability distribution functions for single line availabilities and for the durations of failures are given.... View full abstract»

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Aims & Scope

IEEE Transactions on Communications focuses on all telecommunications including telephone, telegraphy, facsimile, and point-to-point television by electromagnetic propagation.

 

 

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Naofal Al-Dhahir
University of Texas at Dallas