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IEEE Transactions on Communications

Issue 6 • June 1986

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

    Publication Year: 1986, Page(s): 0
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    Freely Available from IEEE
  • Overload Performance of Several Processor Queueing Disciplines for the M/M/1 Queue

    Publication Year: 1986, Page(s):538 - 546
    Cited by:  Papers (34)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (729 KB)

    In a Variety of overloaded queueing systems (e.g., an overloaded call processing system), long delays can result either in poor service given to the customer or in customers, unknown to the system, turning "bad." For example, in switching systems, long dial tone delays can result in customers initiating dialing before receiving dial tone. In this case the system will not receive all the digits and... View full abstract»

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  • Performance Analysis for a Terminal-Priority Contentionless Access Algorithm for Multiple-Access Communications

    Publication Year: 1986, Page(s):569 - 575
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (674 KB)

    We consider a multiple-access broadcast communication channel which serves a network of terminals, each characterized by a distinct priority level. Higher priority terminals require, on the average, faster access across the communication channel than lower priority ones. We present a terminal priority contentionless access (TPCA) control scheme for sharing such a channel on a conflict-free basis. ... View full abstract»

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  • Integer Sets with Distinct Sums and Differences and Carrier Frequency Assignments for Nonlinear Repeaters

    Publication Year: 1986, Page(s):614 - 617
    Cited by:  Papers (28)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    The problem of assigningncarrier frequencies so as to avoid certain types (third and fifth order) of intermodulation interference is discussed. For the third-order case, close upper and lower bounds on the optimal solution are established; and close to optimal solutions are given forn < 100(previously, suboptimal solutions were known only forn leq 23). For the f... View full abstract»

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  • Optimal Detection of Hard-Limited Data Signals in Different Noise Environments

    Publication Year: 1986, Page(s):619 - 622
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    A number of digital techniques for detecting binary antipodal signals are based on examining the polarities of the received signal samples and ignoring their amplitudes. The structure of the optimum detector for the hard-limited samples is derived, and its performance is compared to those of some commonly used schemes in impulsive as well as Gaussian noise environments. The optimum receiver for View full abstract»

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  • Queue Size and Delay Analysis for a Communication System Subject to Traffic Activity Mode Changes

    Publication Year: 1986, Page(s):622 - 628
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (711 KB)

    We consider a discrete single-server queueing/communication system, in which the arrival distribution is changing stochastically with time. The distribution of the number of messages to arrive within a time slot depends on a traffic activity process of modes. This process of modes is a two-state Markov chain: mode 0 and mode 1, which represent light and heavy traffic conditions, respectively. The ... View full abstract»

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  • Comments on "A Predictor Switching Scheme for DPCM Coding of Video Signals"

    Publication Year: 1986, Page(s):628 - 630
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    In the above paper, conditions are derived for determining whether or not a scheme with transmission of predictor information for selected pels is better than a scheme with adaptive predictor switching only. These comments contain experimental evidence which proves that those conditions are not valid. Moreover, it is pointed out which part of the derivation of the above conditions is erroneous. View full abstract»

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  • [Back cover]

    Publication Year: 1986, Page(s): 0
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    Freely Available from IEEE
  • The Effects of Random Message Sizes on the Performance of the CSMA/CD Protocol

    Publication Year: 1986, Page(s):547 - 553
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (696 KB)

    We present a performance model of the carrier-sense multiple-access protocol with collision detection when each message consists of a geometrically distributed number of packets. We solve the model analytically and present numerical evidence that throughput degrades slightly when the mean number of packets per message is increased and the load is kept constant. The numerical examples indicate that... View full abstract»

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  • Design Criteria for Crosstalk Interference Between Digital Signals in Multipair Cable

    Publication Year: 1986, Page(s):593 - 599
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (792 KB)

    This paper proposes design criteria for the crosstalk interference between digital line systems operating in multipair cable, with plesiochronous and synchronous network configurations. Existing solutions are shown to be appropriate in some cases, in some other cases to be based on imperfect design criteria, and in other cases, such as the plesiochronous case, to be absent. For engineering purpose... View full abstract»

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  • Advanced Groupband Data Modem Using Orthogonally Multiplexed QAM Technique

    Publication Year: 1986, Page(s):587 - 592
    Cited by:  Papers (56)  |  Patents (59)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    An advanced groupband data modem based on the orthogonally multiplexed QAM technique is proposed. Its performance is evaluated through experiments. In the proposed modem, data are transmitted by a number of orthogonally multiplexed parallel subchannels. Because of this orthogonally multiplexing parallelism, the proposed modem becomes more immune to Gaussian noises, impulsive noises, and channel di... View full abstract»

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  • Performance of Error-Correcting Codes on Channels with Memory

    Publication Year: 1986, Page(s):513 - 521
    Cited by:  Papers (35)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (904 KB)

    Most magnetic recording and many other digital communication channels exhibit statistical dependencies among errors. The design of error-control schemes for such channels .requires proper models and tools that can be used to evaluate error performance after decoding. In this paper a simplified partitioned model of a channel with memory suggested by B. D. Fritchman is considered. This model is used... View full abstract»

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  • An Asymptotically Optimal Receiver for Heterodyne Optical Communication

    Publication Year: 1986, Page(s):617 - 619
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    An incoherent receiver is derived for the heterodyne optical channel under the assumption of Phase coherence at the start of each transmitted sequence. The receiver is optimal in the limit of small bit intervals with respect to the coherence time of the laser oscillators, and reduces to that proposed by Jeromin and Chan [1] when no initial phase coherence is present. Computer simulations indicate ... View full abstract»

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  • Pseudoerror Monitor for 16 QAM 140 Mbit/s Digital Radio

    Publication Year: 1986, Page(s):606 - 613
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (648 KB)

    This paper presents the performance of a pseudoerror monitoring technique for a 16 QAM 140 Mbit/s digital radio in presence of multipath dispersive fading. The so-called pseudoerrors, generated by means of a threshold modification of two, namely, secondary receivers are entered into an extrapolating function to obtain a fast bit error ratio (BER) calculation. A counting time of 10 ms was retained ... View full abstract»

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  • Dynamic Behavior of a CSMA-CD System with a Finite Population of Buffered Users

    Publication Year: 1986, Page(s):576 - 586
    Cited by:  Papers (31)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1056 KB)

    In packet broadcast networks with buffered users, queues of packets at the users interfere with each other through a shared broadcast channel. Therefore, it is difficult to analyze the performance of such Systems by classical queueing theory. This paper provides an approximate performance analysis of a slotted nonpersistent CSMA-CD system with a finite number of users, each having a buffer of fini... View full abstract»

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  • Bit Synchronization in the Presence of Asymmetric Channel Noise

    Publication Year: 1986, Page(s):528 - 537
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (744 KB)

    Bit synchronization in the presence of asymmetric channel noise has not appeared in the open literature. It is the purpose of this paper to study the tracking performance (clock jitter and cycle slip rate) of a popular digital clock synchronizer, the digital data transition tracking loop (DTTL), in the presence of asymmetric noise. Related parameters of interest, the transition density and data as... View full abstract»

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  • Probability of Error and Capacity of PPM Photon Counting Channel

    Publication Year: 1986, Page(s):600 - 605
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    Calculation of the capacity for a Poisson channel with a source noise as modeled by Pierce is done by bounding the error Probability. Based on Chernoff's bound properties, a more general method yielding a formula for the channel capacity is outlined. View full abstract»

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  • A Performance Model of the OSI Communication Architecture

    Publication Year: 1986, Page(s):554 - 563
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1000 KB)

    The analytical model proposed in this paper aims at predicting the performance of software implementations which would be built according to the OSI basic reference model, The model uses the peer protocol standard of a layer as the reference description of an implementation of that layer. The model is basically a closed multiclass multichain queueing network with a processor-sharing center modelin... View full abstract»

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  • Maximum Likelihood Carrier Phase Recovery for Linear Suppressed-Carrier Digital Data Modulations

    Publication Year: 1986, Page(s):522 - 527
    Cited by:  Papers (70)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    The problem of ML estimation of the Phase of a general data-modulated carrier is considered. The shortcomings of current iterative approaches to the problem are pointed out, and the correct conceptual approach is proposed. The true ML estimator is then obtained and found to be nonimplementable. However, by specializing to limits of high and low SNR, the general ML estimator is shown to reduce to i... View full abstract»

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  • Reliability Analysis for Integrated Networks with Application to Burst Switching

    Publication Year: 1986, Page(s):564 - 568
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    System performance and reliability are jointly assessed for highly reliable telecommunication or computer networks. The underlying model assumes that at most a small number of components can be "down" at a time, and that the average repair/replacement time of a failed component is small when compared to the average uptimes of network components. At steady state the system is assumed to follow a re... View full abstract»

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  • A Study of On-Off Characteristics of Conversational Speech

    Publication Year: 1986, Page(s):630 - 637
    Cited by:  Papers (63)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (728 KB)

    The on-off statistics of conversational speech have been investigated using a large database of 50 min of telephone speech. Based on the measurement results of on-off patterns, probability density functions of silence and talkspurt durations are modeled approximately by two weighted geometric functions. Then, for any value of hangover or fill-in, speech parameters such as speech activity, average ... 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