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IEEE Transactions on Communications

Issue 4 • April 1978

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Displaying Results 1 - 14 of 14
  • [Front cover and table of contents]

    Publication Year: 1978, Page(s): 0
    Request permission for commercial reuse | PDF file iconPDF (157 KB)
    Freely Available from IEEE
  • Tracking Performance of Costas Loops with Hard-Limited In-Phase Channel

    Publication Year: 1978, Page(s):420 - 432
    Cited by:  Papers (22)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (953 KB)

    It is becoming increasingly popular in the design of suppressed carrier receivers, which employ Costas loops for earrier reconstruction, to hard-limit the output of the in-phase channel. Doing so allows replacement of the analog multiplier, which forms the loop error signal, with a chopper-type device which typically exhibits much less dc offset. The false lock behavior of such a hard-limited loop... View full abstract»

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  • New Materials for Superconductive Communication Cables

    Publication Year: 1978, Page(s):449 - 458
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (991 KB)

    The feasibility of superconductive coaxial cables as a communication medium with an enormous capacity may be increased by applying superconductive materials with low surface resistances and high critical temperatures as well as dielectrics with low loss. This paper discusses the mechanisms affecting metallic conduction and dielectric properties of materials in relation to their application in a lo... View full abstract»

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  • A 32 Mbit/s Component Separation DPCM Coding System for NTSC Color TV

    Publication Year: 1978, Page(s):458 - 465
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (886 KB)

    A component separation DPCM Coding system is described which is capable of transmitting a 4 MHz NTSC color TV signal with broadcast quality at a 32.064 Mbit/s rate. The input NTSC color TV signal is first separated into a luminance componentYand two chrominance componentsIandQ. Then, these three components are converted into a TDM-PCM color signal, whereI View full abstract»

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  • On Binary DPSK Detection

    Publication Year: 1978, Page(s):484 - 486
    Cited by:  Papers (28)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (275 KB)

    Optimum detection of binary DPSK yields a bit error probability, Peof (1/2) exp (-E_{b}/eta), the classic result, but requires a reference carrier in-frequency but not necessarily in-phase with the received carrier. Any other detector will yield degraded results. Several well known textbooks give a derivation for a suboptimum detector with the above result but neglect intersy... View full abstract»

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  • [Back cover]

    Publication Year: 1978, Page(s): 0
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    Freely Available from IEEE
  • A Hybrid Channel Assignment Scheme in Large-Scale, Cellular-Structured Mobile Communication Systems

    Publication Year: 1978, Page(s):432 - 438
    Cited by:  Papers (185)  |  Patents (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (808 KB)

    This paper considers the problem of channel assignment in mobile communication systems, where the service area is divided in hexagonal cells. In particular, a Hybrid Channel Assignment Scheme is studied and certain results are obtained using GPSS simulation of a model 40-cell system. View full abstract»

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  • Spectrum Shaping with Alphabetic Codes with Finite Autocorrelation Sequence

    Publication Year: 1978, Page(s):474 - 478
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (624 KB)

    In this paper we consider the problem of recoding binary data into ternary sequences for synchronous baseband data transmission systems. Our major objective is the shaping of the power spectral density of the channel process in order to combat the effects of intersymbol interference caused by the low-frequency cut-off of the channel. This motivates our interest in designing codes whose channel pro... View full abstract»

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  • Finite Buffer Behavior with Poisson Arrivals and Random Server Interruptions

    Publication Year: 1978, Page(s):470 - 474
    Cited by:  Papers (30)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    A queueing model with finite buffer size, Poisson arrival process, synchronous transmission and server interruptions is studied through a Bernoulli sequence of independent random variables. An integrated digital voice-data system with Synchronous Time-Division Multiplexing (STDM) for voice sources and Poisson arrival process for data messages is considered as an application for this model. The rel... View full abstract»

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  • On the Group Delay Properties of a Set of Microwave Circuits

    Publication Year: 1978, Page(s):486 - 488
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    In this correspondence group delay properties of particular type microwave circuits are reported. The proposed systems allow to obtain linear group delay versus frequency characteristic with variable slope while the delay at a preassigned frequency is constant; slope variation is achieved by opportunely biasing a varactor diode. These performances seem to be very important in order to obtain micro... View full abstract»

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  • Non-Coherent Digital Matched Filters: Multibit Quantization

    Publication Year: 1978, Page(s):409 - 419
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (800 KB)

    A study of non-coherent digital matched filters (DMF's) with multibit quantizers, matched to phase-shift-keyed signals, is presented. Results relating output and input signal-to-noise ratios are given for three types of additive channel interference and mixtures thereof: white Gaussian noise and incoherent and coherent constantamplitude sine-wave jamming. These results are compared with both analo... View full abstract»

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  • Pulse Shaping in Bandlimited Digital Satellite Systems

    Publication Year: 1978, Page(s):478 - 484
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (696 KB)

    Recent work on proper design of signals in single carrier 4φ-PSK systems is summarized. The main conclusion is that it is possible to minimize the overall degradation due to nonlinearities and adjacent channel interference by careful choice of pulse shaping filters. We also show that the penalty, in terms of power, for not being careful can be high. An example is given showing effects of co-c... View full abstract»

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  • Modulation Transfer from TDMA On-Off Bursting to FM Carriers in Memoryless Nonlinear Devices, Part II-Baseband Performance

    Publication Year: 1978, Page(s):439 - 449
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (784 KB)

    When TDMA and FM carriers are commonly amplified by a memoryless device with nonlinear amplitude and phase characteristics, modulation transfer noise induced by the on-off bursting of the TDMA signals will be present at the FM carriers. In Part II of this paper, closed form expressions of the power spectra of the modulation transfer noise are derived for many special carrier configurations of inte... View full abstract»

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  • Distributed Control for a Variable Length Message Store-and-Forward System

    Publication Year: 1978, Page(s):465 - 470
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB)

    This paper describes the performance of a store-store-and-forward communications network with an adaptive routing strategy. The network chosen is a simplification of the AUTODIN network (described below) and the strategy is a modification of the routing of ARPANET. The objective is to make a network such as AUTODIN, with its wide variation in message length, effectively responsive for computercomp... 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