By Topic

Selected Areas in Communications, IEEE Journal on

Issue 2 • Date March 1985

Filter Results

Displaying Results 1 - 19 of 19
  • [Back cover]

    Publication Year: 1985 , Page(s): 0
    Save to Project icon | Request Permissions | PDF file iconPDF (386 KB)  
    Freely Available from IEEE
  • [Front cover and table of contents]

    Publication Year: 1985 , Page(s): 0
    Save to Project icon | Request Permissions | PDF file iconPDF (346 KB)  
    Freely Available from IEEE
  • Foreword: Wide-Band Local Access

    Publication Year: 1985 , Page(s): 253 - 254
    Save to Project icon | Request Permissions | PDF file iconPDF (234 KB)  
    Freely Available from IEEE
  • Characterization of Cable TV Networks as the Transmission Media for Data

    Publication Year: 1985 , Page(s): 255 - 265
    Cited by:  Papers (5)  |  Patents (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1058 KB)  

    Two-way cable television (CATV) networks have been developed over a period of a dozen years or so with the express purpose of serving as the transmission medium for a variety of duplex data communications services for home and business. Unfortunately, many CATV engineers have only a rudimentary understanding of encoded transmission theory and practice, and almost no experience with the terminology and techniques developed for efficient data transmission. On the other hand, the designers of modems and the developers of protocols tend to have a rather naive view of the transmission characteristics of a CATV network. This paper is presented as a tutorial for telecommunications engineers and designers who need to know more about the technological characteristics of CATV networks. View full abstract»

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

    Publication Year: 1985 , Page(s): 345 - 346
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (288 KB)  

    First Page of the Article
    View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A High Performance LSI Digital Signal Processor for Communication

    Publication Year: 1985 , Page(s): 347 - 356
    Cited by:  Papers (5)  |  Patents (11)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1670 KB)  

    This paper describes a newly developed CMOS LSI DSP (FDSP3). It has a powerful multiplier, which operates at a rate of 10 M-operations/s, almost twice as fast as the fastest existing LSI DSP's. Some key techniques to attain these high performance characteristics of the DSP are described. Suitable memory capacities of the RAM and ROM were analyzed as a function of the operational capability of the DSP. These were reflected in the design of the FDSP3. To assist in the development of the program, support tools have been developed. A Pascal based cross compiler and an on-line debugging tool are described in some detail. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Microprocessor for Speech Recognition

    Publication Year: 1985 , Page(s): 369 - 376
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (878 KB)  

    A new single-chip microprocessor for speech recognition, the SRP, has been developed, utilizing a multiprocessor architecture and a pipelined structure. It can recognize up to 340 isolated words or 40 connected words in real time. The SRP contains a vector distance calculator, a DP-equation calculator, and an I/O controller operating in a pipelined manner. Algorithm variations and operation parameters are user programmable, and the total size of the SRP program for a typical speech recognition system is about 700 words. The device has been fabricated with n-channel Si-gate E/D MOS technology with 2.5 μm design rules and employs 7296 three-transistor dynamic RAM cells for a total of more than 40 000 transistors. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Architecture Design of a High-Quality Speech Synthesizer Based on the Multipulse LPC Technique

    Publication Year: 1985 , Page(s): 377 - 383
    Cited by:  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (668 KB)  

    This paper describes an architectural design of a high-quality speech synthesizer based on the multipulse linear predictive coding technique. The algorithms implemented in the design are derived. The main features of the synthesizer are a multiprocessor architecture, real time operation, \mu-/A -law coded PCM output, flexible system interface, relative ease of programming, high quality of synthesized speech, and variable bit rates. The synthesizer is highly testable as most of the internal resources can be addressed externally through a parallel system-controller port and a set of instructions. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Introduction of Wide-Band Communications in the Telecommunications Network

    Publication Year: 1985 , Page(s): 286 - 291
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (632 KB)  

    An increasing demand for digital wide-band business communications has been emerging as a new driving force in the evolution of the telecommunication network. In parallel with this demand, new transmission, multiplexing, and switching technologies are becoming available to support the implementation of attractive end-to-end wide-band services. This paper looks at the application opportunities of wide-band technologies in the telecommunication network for both near and longer term use, and discusses key implementation and evolution issues. The paper also defines a wide-band channel structure plan as a basis for wide-band ISDN standardization. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Distributed Switching for Data Transmission over Two-Way CATV

    Publication Year: 1985 , Page(s): 323 - 329
    Cited by:  Papers (5)  |  Patents (11)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (624 KB)  

    Most of tile present approaches to two-way interactive CATV focus on the centralized approach, in which all traffic must travel to the CATV head end. In this paper, we present a distributed approach, in which intelligent store-and-forward packet switches are to be installed at various locations on the cable. The analysis emphasizes three main criteria: the maximum traffic flow on the cable, the throughput of each switch, and the average message delay. Two possible schemes are compared. In one, the switches appear on the main trunk only. In the second, switches are used at branch locations as well. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Optoelectronic Switching in Digital Networks

    Publication Year: 1985 , Page(s): 336 - 344
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (976 KB)  

    The use of optoelectric switching matrices in digital networks is examined. The possibility of large very compact arrays is demonstrated. Design considerations are discussed for a switching node for broad-band digital signals at rates of 100 and 500 Mbits/s, with 100 inputs and 103outputs. A novel feature of optoelectronic switching is that power consumption tends to scale approximately linearly with array dimension, leading to potential advantages over electronic alternatives in large dimension high-rate switching matrices. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • On the Design of a High-Performance LSI Circuit Digital Signal Processor for Communication

    Publication Year: 1985 , Page(s): 357 - 368
    Cited by:  Papers (1)  |  Patents (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1000 KB)  

    This paper describes the design of a highly efficient CMOS LSI circuit digital signal processor (FDSP3). To realize an operating cycle rate of 10 MHz and a throughput rate of 0.6 μs per second-order filter section, considerable care has been paid to the design of software structures and hardware circuitry. Basic program routines and some application examples are also shown. These examples illustrate the high efficiency of the developed DSP device. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Design and Architecture of the High-Speed Digital Data Transmission System in NTT

    Publication Year: 1985 , Page(s): 292 - 299
    Cited by:  Papers (7)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (784 KB)  

    Demand for high-speed wide-band telecommunication services is rapidly growing due to the remarkable progress in office, factory, and laboratory automation. These services are expected to be first introduced in leased circuits and then extended, to high-speed switched services. This paper presents the users' demands for such high-speed services and the NTT design concepts for the high-speed digital data transmission system (HDDTS) in NTT to provide such high-speed leased circuit service. The ISDN user-network interface is adopted. The basic high-speed pointto-point transmission service started in October 1984, and enhanced leased circuit service involving multiplexed interfaces and muitipoint circuits will be introduced in the fall of 1985. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The Future Impact of GaAs Digital IC's

    Publication Year: 1985 , Page(s): 384 - 393
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (888 KB)  

    A review of digital GaAs IC technology and an assessment of its future impact on gigabit signal processing is presented. High-speed signal processing and computers will require MSI-complexity interface circuits capable of 1-10 GHz clock frequencies and LSI-complexity digital circuits operating in the 0.2-5 GHz range at tens of microwatts per gate. A wide range of applications exists for frequency counters, multiplexers, A/D converters, FFT's, microprocessors, and memories that operate at speeds significantly higher than on presently available circuits. Issues related to high-speed IC design such as power dissipation, packing density, capacitance effects, design rules, and intra- and interchip propagation delays are discussed. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Spread Spectrum Access in Two-Hop CATV Data Networks

    Publication Year: 1985 , Page(s): 312 - 322
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (920 KB)  

    A technique for data transmission over a CATV network, structured in a two-hop configuration, is presented. The technique combines the use of random access over the outer hop (distribution branches) and spread spectrum over the inner hop (main trunk) to maximize the CATV network throughput. A model is constructed for the spread spectrum access strategy. The throughput-delay relationship is obtained as a function of several design parameters. Numerical results are presented and discussed based on the assumptions and limitations of the model. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • System Aspects and Realization of Wide-Band Switching in the Local Area

    Publication Year: 1985 , Page(s): 330 - 335
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (656 KB)  

    This paper discusses the functional components of nodes in wide-band switching networks. Emphasis is given to the local area where the system's architecture can be considerably simplified. The experimental results are related to this type of application. They demonstrate the availability of all system components for medium-size systems (up to 240 lines). A 16 × 16 highly integrated switch is described as a building block for greater systems. It is capable of handling data streams up to 380 Mbits/s. The maximum jitter amplitude observed after passing one cross point is 0.25 ns. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The Development of Cable Data Communications Standards

    Publication Year: 1985 , Page(s): 273 - 285
    Cited by:  Papers (8)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1288 KB)  

    Commercially successful application of data communications technology to coaxial cable distribution networks requires the creation of systems useful to large numbers of subscribers sharing common communications procedures. Furthermore, it is desirable, particularly in entertainment CATV networks, that subscriber ownership of some or all terminal equipment and peripheral attachments be possible since such ownership enables the sharing of capital costs between the network operator and the subscriber. Systems designers are led inescapably to the need for standard interfaces and protocols. The paper describes some of the major types of cable data systems currently under development for both institutional and entertainment network applications. Common to both is the concept of a local interface unit to act as a link between the subscriber's terminal equipment and the cable drop. The design of the drop-side interface of this unit raises some major standardization issues. Another important issue is that of compatibility between data and video channels where both types of services are offered on the same cable television plant. The major thrust of present standardization activity has been founded upon the open systems interconnection (OSI) reference model and has taken place within a joint CVCC/EIA committee on teletext and within the IEEE Project 802.6 subcommittee on metropolitan area networks. The paper reviews this activity and explains the principal issues to be resolved. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Voice and Data on a CATV Network

    Publication Year: 1985 , Page(s): 300 - 311
    Cited by:  Papers (13)  |  Patents (14)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1240 KB)  

    A technique for transmitting voice and data on a conventional subsplit CATV network is described. The technique uses a variation on the carrier sense multiple access/collision detection protocol used in local area networks. A variation on this protocol, called movable slot TDM allows periodic voice Sources to share this network without distorting the voice signal. A scheme for sharing frequency spectrum and space is outlined that removes the distance and transmission rate constraints associated with such networks. A transmission strategy is described which allows these protocols to be used on a subsplit CATV system. The system is thus a candidate for local/metropolitan area networks Which support digital voice and data services along with analog (mostly one-way) video. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Data Transmission Implementation on Broad-Band Networks

    Publication Year: 1985 , Page(s): 266 - 272
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (800 KB)  

    Broad-band networks present many advantages for the implemention of data transmission circuits. Whereas communication system concepts are universally applicable, there are many unique details and practial considerations involved in design and operation of broad-band networks. This paper describes broad-band configurations and their system design implications and includes a discussion of current modem designs, spectral occupancy, and modulation characteristics configurations and protocols, interference, and error control, as well as broad-band network control and maintenance. In addition, a data transmission network addressing many of the basic factors and providing multiple services is described. View full abstract»

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

Aims & Scope

IEEE Journal on Selected Areas in 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
Muriel Médard
MIT