IEEE Communications Magazine

Issue 2 • Feb. 1989

Filter Results

Displaying Results 1 - 6 of 6
  • New directions in signaling for broadband ISDN

    Publication Year: 1989, Page(s):6 - 14
    Cited by:  Papers (37)  |  Patents (20)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (993 KB)

    User networks signaling is considered. The evolution of signaling protocols is outlined, analyzing the forces producing changes in the past. Emerging broadband switching technologies and services are discussed, emphasizing capabilities that might be required. A conceptual model for representing integrated-services digital network (ISDN) calls is presented as the basis for structuring a more flexib... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Spectral shaping and digital synthesis of an M-ary time series

    Publication Year: 1989, Page(s):15 - 24
    Cited by:  Papers (6)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (915 KB)

    The use of pulse shaping to control transmitted spectral density precisely is examined. A digital filter architecture is described that not only mitigates the traditional problems of lengthy development intervals and cost manufacturing methods, but offers the additional features of intrinsically coding high-speed binary (M=2) data into M-ary symbols while ensuring highly reproducible, baud-normali... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Bandwidth utilization of a large local area network

    Publication Year: 1989, Page(s):25 - 30
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (612 KB)

    DECnet Area 2, a local area network (LAN) that is part of Digital Equipment's worldwide Easynet, is described. It is comprised of several baseband Ethernet segments connected by local Ethernet repeaters and standard LAN Bridge 100 devices, which extend a LAN. Measurements carried out to determine whether the capacity of the Ethernet had been reached or exceeded are discussed. The measurements show... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • VSAT network economics: a comparative analysis

    Publication Year: 1989, Page(s):31 - 35
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (371 KB)

    The economics of virtual circuit services offered through very small aperture terminal (VSAT) networks are examined and compared with terrestrial alternatives. It is shown that VSAT networks are cost-competitive with terrestrial networks at around $300 per month per VSAT. For HUB costs in the range of $100000 the VSAT network can be cost-competitive for networks as small as 100 VSATs. Networks sma... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A multiple digital modulator

    Publication Year: 1989, Page(s):36 - 45
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1015 KB)

    A highly versatile modulator that uses digital signal processing methods is described. The scheme can realize most known modulations exhibiting diverse forms of signal spectrum and eye diagram, and it can realize a given modulation with extreme precision. A single modulator unit can be host to many forms of modulation, i.e. many forms of signal constellations and spectral shapes. The technique als... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Enhancing speech degrated by additive noise or interfering speakers

    Publication Year: 1989, Page(s):46 - 52
    Cited by:  Papers (20)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (701 KB)

    The author examines some of the ways that speech signals, subjected to certain degradations (e.g. additive noise, interfering speakers, bandlimiting, single-channel data), can be processed to increase the likelihood of being correctly understood. He concentrates on applications that involve monaural listening. He treats spectral and time-domain subtraction techniques, methods involving fundamental... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.

Aims & Scope

IEEE Communications Magazine, considered by most to be their most important member benefit, provides timely information on all aspects of communications: monthly feature articles describe technology, systems, services, market trends, development methods, regulatory and policy issues, and significant global events.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Tarek S. El-Bawab
Jackson State University