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IEEE Transactions on Communications

Issue 3 • Date March 1979

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Displaying Results 1 - 21 of 21
  • [Front cover and table of contents]

    Publication Year: 1979, Page(s): 0
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    Freely Available from IEEE
  • [Back cover]

    Publication Year: 1979, Page(s): 0
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    Freely Available from IEEE
  • Binary CPSK Performance Analysis for Saturating Band-Limited Channels

    Publication Year: 1979, Page(s):596 - 603
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (640 KB)

    An expression is derived for the error probability of binary CPSK signals received over a soft-limited channel in the presence of pre- and post-limiter additive Ganssian noise. Although this expression is not in closed form, it may be efficiently evaluated to any desired accuracy using a recurrence method developed in the appendix. System performance is also evaluated when the signals are subjecte... View full abstract»

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  • The Influence of Protocols on the Stability Conditions in Packet-Switching Networks

    Publication Year: 1979, Page(s):611 - 619
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (864 KB)

    A packet-switching network is considered as a tandem system of store-and-forward links. In this paper, it is shown that the maximum input traffic, with finite intermediate buffer size, is very sensitive to the distribution of the transmission time. The performance of two different protocols is compared under various distributions of transmission times. View full abstract»

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  • Assigning a Minimal Multiple-Center Under a Given Reliability Index in Tree Networks

    Publication Year: 1979, Page(s):638 - 639
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (152 KB)

    An efficient algorithm is presented for assigning a minimal multiple-center in a tree network that satisfies a given reliability index. View full abstract»

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  • Subscriber-Loop Digital Transmission Using Opto-Electronic Transmitters and Receivers

    Publication Year: 1979, Page(s):629 - 635
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    The efficiencies of different methods for subscriber-loop digital transmission are compared, using as a criterion the cost per bit/second per kilometer of wire, denoted "CSP". Approaches to reduction of CSP are suggested, in particular the use of opto-electronic transmitters and receivers in a differential connection, resulting in a relatively noise-immune subscriber line. A graphic method for the... View full abstract»

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  • Design and Implementation of a Signaling Handling Unit for Electronic Exchanges

    Publication Year: 1979, Page(s):591 - 596
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (616 KB)

    Design of a unit which handles functions of line scanning, digit forming, and digit pulsing fully independent of the main processor has been presented. These functions as implemented in conventional systems form a major portion of the real time load on the processor. The hardware unit described in this paper takes care of all these functions with only nominal interaction with the processsor, there... View full abstract»

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  • Power Division in Spread Spectrum Systems with Limiting

    Publication Year: 1979, Page(s):574 - 582
    Cited by:  Papers (7)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (712 KB)

    This paper finds power division through a bandpass nonlinearity when the input is two spread spectrum signals plus noise. This model applies to code division multiple access (CDMA) satellites or to multiple transmission of CDMA through a common Earth terminal transmitter. The solution requires finding a single attenuation constant for each input signal including the input noise. This approach prov... View full abstract»

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  • Call Repacking in Connecting Networks

    Publication Year: 1979, Page(s):589 - 591
    Cited by:  Papers (25)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    A method for increasing the traffic capacity of connecting networks is presented which involves rearrangement of calls while in progress. In contrast to previously studied methods for rearrangement of existing calls, the process involves repacking calls as existing calls terminate, rather than when arriving calls are blocked. The scheme has the advantage that the added control complexity is much l... View full abstract»

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  • Analytic Approximation of Blocking Probabilities in Circuit Switched Communication Networks

    Publication Year: 1979, Page(s):603 - 606
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    A method inspired from S. Katz's service evaluation algorithm [6] is presented. The new algorithm is recursive, rather than iterative, in nature, and especially suited for networks that do not contain cycles. It also introduces two new features which take existing theoretical results into account, and as such corresponds more closely to the current state of traffic theory. View full abstract»

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  • Experimental Investigation of Some Effects of Multipath Propagation on a Line-of-Sight Path at 14 GHz

    Publication Year: 1979, Page(s):643 - 647
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    A microwave line-of-sight propagation experiment is carried out in Denmark at frequencies around 14 GHz. Results from long term measurements of multipath propagation are presented. The multipath fade durations are shown to be log-normally distributed. The level dependence of the probability of fading, P , the average duration of fades, View full abstract»

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  • ALOHA/TDM Systems with Multiple Downlink Capacity

    Publication Year: 1979, Page(s):537 - 541
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    The concept of a processing satellite with multiple slotted ALOHA uplinks to efficiently fill a TDM downlink is extended to include multiple downlinks. Throughput is derived for a general configuration with n ALOHA uplinks and m TDM downlinks. An optimization procedure is described to select the View full abstract»

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  • Optimal Packet Length for Packet Voice Communication

    Publication Year: 1979, Page(s):607 - 611
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    It is shown that for typical operating parameters, the optimal packet length for a single link packet voice system is of the order of 300-700 bits. This is contrary to both the optimal length of a data packet (approximately 1000 bits), and documented experimental implementations of such network architecture for voice (approximately 1000 bits). View full abstract»

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  • An Almost Linear Relation Between the Step Size Behavior and the Input Signal Intensity in Robust Adaptive Quantization

    Publication Year: 1979, Page(s):623 - 629
    Cited by:  Papers (5)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (648 KB)

    A considerable amount of information regarding the behavior and performance of robust adaptive quantizers is contained in the function C(\sigma ) which denotes the dependence of the central (or typical) step size, C , on the intensity, σ, of the input random variables. The graphical representation of View full abstract»

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  • Linearization of Multichannel Analog Optical Transmitters by Quasi-Feedforward Compensation Technique

    Publication Year: 1979, Page(s):582 - 588
    Cited by:  Papers (9)  |  Patents (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (784 KB)

    A quasi-feedforward compensation technique is described for linearization of LED's in analog fiber optics based video transmission systems, Experimentally we have observed an improvement of more than 35 dB in second-order and 20 dB in third-order distortion in a system transmitting three TV channels simultaneously. The linearized system is capable of video signal transmission over a distance of at... View full abstract»

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  • Simple Approximations of the Error Function Q(x) for Communications Applications

    Publication Year: 1979, Page(s):639 - 643
    Cited by:  Papers (81)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    Simple analytical upper bounds, approximations and lower bounds on the error function Q(x) are presented and analyzed. A class of functions are given, where the choice of two parameters result in good upper bounds, lower bounds and approximations on Q(x) . The results are given in formulas, parameter tables and graphs. T... View full abstract»

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  • Improved Phase-Locked Loop Performance Via Nonlinear Loop Filters

    Publication Year: 1979, Page(s):542 - 556
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1072 KB)

    A new structure for the loop filter of a PLL which consists of a conventional linear first order filter connected in a feedback arrangement with a static nonlinearity is analyzed. In the absence of noise, the steady state operating conditions (i.e., equilibrium points) are independent of the parameters of the nonlinearity, and asymptotic stability of the PLL for sufficiently small frequency detuni... View full abstract»

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  • Two Discrete-Time Queues in Tandem

    Publication Year: 1979, Page(s):563 - 573
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (720 KB)

    A discrete-time queueing problem involving two queues in tandem, with unit service time, is considered. Such a situation can arise within a packet-switching network. Arrivals at the queues occur from separate sources, which may be correlated. The joint arrivals from the two sources are assumed to be independently and identically distributed in each unit time interval. In addition, the output of th... View full abstract»

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  • Addendum to "Volterra Systems with Random Inputs: A Formalized Approach"

    Publication Year: 1979, Page(s):636 - 638
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    A newly derived expression for the higher order crosscorrelation function of two jointly stationary Gaussian random processes is used to determine the output autocorrelation function of a Volterra system driven by a Gaussian input and to simplify a previously published expression for the output power spectral density and its derivation. View full abstract»

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  • Logistic Function to Describe the Legibility of Transmitted Alphanumerics

    Publication Year: 1979, Page(s):619 - 623
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (600 KB)

    A mathematical model, based on the logistic function, is proposed to describe the legibility of alphanumerics transmitted by facsimile or by television. The model has been successfully applied to results obtained with examples of both types of systems. It describes the effects of both horizontal and vertical definition, at the same time reflecting the additive effect of one parameter on the other. View full abstract»

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  • The Single Server Queue with Periodic Arrival Process and Deterministic Service Times

    Publication Year: 1979, Page(s):556 - 562
    Cited by:  Papers (47)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    We derive an algorithm for computing the exact delay distribution for the following first-come-first-served single server queue. The arrival process is the superposition of N + 1 independent equivalent deterministic arrival streams, and the service times are deterministic. Numerical results are used to compare this system with an approximating system which ha... 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