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IEEE Transactions on Communications

Issue 7 • July 1985

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Displaying Results 1 - 25 of 28
  • [Front cover and table of contents]

    Publication Year: 1985, Page(s): 0
    Request permission for commercial reuse | PDF file iconPDF (214 KB)
    Freely Available from IEEE
  • Throughput Analysis for Persistent CSMA Systems

    Publication Year: 1985, Page(s):627 - 638
    Cited by:  Papers (100)  |  Patents (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (907 KB)

    The channel throughput for a finite number of packet broadcasting users is analyzed for random access protocols, including slotted persistent carrier sense multiple access (CSMA) with and without collision detection and unslotted persistent CSMA with and without collision detection. We consider bothp- and 1-persistent CSMA. Our results can be extended to infinite population cases (by ta... View full abstract»

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  • Performance Analysis of Tandem Burst-Error Links with Applications to ISDN

    Publication Year: 1985, Page(s):646 - 653
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (633 KB)

    In this paper, tandem links with burst errors are analyzed using the Gilbert model for individual links. The results, apart from being of general interest, are of particular relevance to the Integrated Services Digital Networks (ISDN) for which the International Telegraph and Telephone Consultative Committee (CCITT) is currently developing performance specifications based on hypothetical reference... View full abstract»

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  • Analysis of Jitter Peaking Effects in Digital Long-Haul Transmission Systems Using SAW-Filter Retiming

    Publication Year: 1985, Page(s):654 - 664
    Cited by:  Papers (10)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1098 KB)

    The new lightwave long-haul transmission systems typically use surface-acoustic-wave (SAW) filters for timing recovery, in place of the phase-locked loops favored in slower systems. We report here analytical studies of jitter phenomena allowed by two kinds of filter ripple. The ripple is capable of causing jitter to accumulate exponentially with the number of regeneratorsNin a repeatere... View full abstract»

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  • Vector Predictive Coding of Speech at 16 kbits/s

    Publication Year: 1985, Page(s):685 - 696
    Cited by:  Papers (125)  |  Patents (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1369 KB)

    Vector quantization, in its simplest form, may be regarded as a generalization of PCM (independent quantization of each sample of a waveform) to what might be called "vector PCM," where a block of consecutive samples, a vector, is simultaneously quantized as one unit. In theory, a performance arbitrarily close to the ultimate rate-distortion limit is achievable with waveform vector quantization if... View full abstract»

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  • Corrections to "Mathematical Models for Cochannel Interference in FH/MFSK Multiple Access Systems"

    Publication Year: 1985, Page(s): 721
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (139 KB)

    First Page of the Article
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  • Multilevel PRS/QPRS Above the Nyquist Rate

    Publication Year: 1985, Page(s):735 - 739
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (526 KB)

    An improved efficiency partial-response signaling (PRS) and quadrature partial-response signaling (QPRS) data filtering strategy, which enables a higher transmission rate (more symbols/s/Hz) than feasible with conventional PRS and QPRS systems, is introduced. With the use of our technique, a smaller number of signal levels (states) can be chosen for specified spectrally efficient applications; thu... View full abstract»

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  • [Back cover]

    Publication Year: 1985, Page(s): 0
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    Freely Available from IEEE
  • Performance Assessment of Band-Limited Limiting and Blanking Communication Systems

    Publication Year: 1985, Page(s):711 - 715
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    This paper presents a general formulation of piecewise linear (PWL) models of voltage transfer functions to characterize channel nonlinearities in satellite digital communication systems. This formulation provides a tractable approach to evaluate the performance of such systems with band-limited PWL limiters, channel blanking, and hardlimiters. The envelope characteristics of the PWL models are de... View full abstract»

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  • Data-Sequence Selective Timing Recovery for PAM Systems

    Publication Year: 1985, Page(s):729 - 731
    Cited by:  Papers (13)  |  Patents (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    An adaptive baud-rate timing recovery scheme for digital communications, suitable for implementation using digital signal processing techniques, is described. Its principal advantages are that determination of functions yielding timing error estimates is simple, and that these estimates are low-variance. This is achieved by calculating timing error estimates only when certain suitable data sequenc... View full abstract»

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  • Analysis and Simulation of a Digital Mobile Channel Using Orthogonal Frequency Division Multiplexing

    Publication Year: 1985, Page(s):665 - 675
    Cited by:  Papers (1413)  |  Patents (282)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1080 KB)

    This paper discusses the analysis and simulation of a technique for combating the effects of multipath propagation and cochannel interference on a narrow-band digital mobile channel. This system uses the discrete Fourier transform to orthogonally frequency multiplex many narrow subchannels, each signaling at a very low rate, into one high-rate channel. When this technique is used with pilot-based ... View full abstract»

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  • Performance of Baseband Digital Data Transmission in Nonlinear Channels with Memory

    Publication Year: 1985, Page(s):715 - 719
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    This paper considers the performance of digital data transmission in nonlinear channels with memory. The analysis is based on the application of a particular form of Volterra series representation for the nonlinear system describing the transmission channel. First, expressions are derived for the output mean and power spectral density under certain conditions. Next, the paper presents a computatio... View full abstract»

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  • Noise Performance and SNR Threshold in PFM

    Publication Year: 1985, Page(s):708 - 711
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    Pulse frequency modulation (PFM) has been considered by several authors for transmitting wide-band signals. However, the noise performance of PFM has been analyzed only above the SNR threshold. In this correspondence the results on the noise performance of PFM available in the literature are summarized, and a more general expression describing noise performance of PFM, both above and below the SNR... View full abstract»

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  • Priority Access Schemes Using CSMA-CD

    Publication Year: 1985, Page(s):620 - 626
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (752 KB)

    Some CSMA-CD schemes for multiple priority message classes are suggested. For all the schemes, an approximate analytic technique for calculating the mean packet delay (for each priority) at the stable operating point of the system has been developed. The analytic results are tested against computer simulation. A Poisson packet arrival process and a general packet length distribution are considered... View full abstract»

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  • Decision Feedback Equalization of Dispersive Radio Channels

    Publication Year: 1985, Page(s):676 - 684
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (840 KB)

    The performance of adaptive decision feedback equalization applied to high bit rate digital radio systems in the presence of multipath propagation is analytically investigated. Minimum phase (MP) and nonminimum phase (NMP) type fades as well as the transition periods between these two states are considered. Insight is given into the IF recovered timing epoch and its consequences on the decision fe... View full abstract»

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  • Encoding of Arbitrary Curves Based on the Chain Code Representation

    Publication Year: 1985, Page(s):697 - 707
    Cited by:  Papers (73)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (992 KB)

    An efficient encoding scheme for arbitrary curves, based on the chain code representation, has been proposed. The encoding scheme takes advantage of the property that a curve with gentle curvature is divided into somewhat long curve sections (segments), each of which is represented by a sequence of two adjacent-direction chain codes. The coding efficiency of the scheme becomes higher as the segmen... View full abstract»

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  • On Improving the Performance of an FIR ADM Digital Filter

    Publication Year: 1985, Page(s):739 - 742
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    In this paper we investigate methods of improving the performance of a finite impulse response (FIR) adaptive delta modulation digital filter (ADMDF). These include modification of the ADM step size adaptation algorithm, coefficient optimization, and the reduction of computational complexity. Compared to the FIR ADMDF of Sunwoo and Un [1], the improved filter yields better performance by approxima... View full abstract»

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  • Rapid Acquisition for Direct Sequence Spread-Spectrum Communications Using Parallel SAW Convolvers

    Publication Year: 1985, Page(s):593 - 600
    Cited by:  Papers (73)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (648 KB)

    In this paper, a technique is described which uses multiple surface acoustic wave (SAW) devices in parallel to reduce the acquisition time of a direct sequence spread-spectrum communication system. Analysis of system performance in both the search and lock modes is presented, and key quantities such as probability of false alarm, probability of correct detection, mean dwell time, and mean time to ... View full abstract»

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  • Envelope Detection of Binary VSB Data Signals

    Publication Year: 1985, Page(s):732 - 735
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    The performance of vestigial-sideband data transmission systems employing envelope detection is considered in the context of broad-band local area networks (BLAN's). General results for horizontal and vertical eye opening are presented and noise performance is assessed for three systems of particular interest. It is concluded that this data transmission scheme is suitable for BLAN's. View full abstract»

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  • Collision Resolution Protocols Utilizing Absorptions and Collision Multiplicities

    Publication Year: 1985, Page(s):721 - 724
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    In this correspondence, we consider the random accessing of a single slotted channel by a large number of packet transmitting users, whose cumulative traffic is Poisson. We assume the existence of the same feedback as that of the MCRAI protocols of Georgiadis, and full channel sensing, and we develop collision resolution algorithms that utilize the absorption concept of Gallager. We observe the im... View full abstract»

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  • A Note Upon Another Error Detecting Code That Is Not Proper

    Publication Year: 1985, Page(s):719 - 721
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    In this correspondence, the performance of the nonlinear error-detecting code, described in CCIR Recommendation 476-2, when used over a memoryless binary symmetric channel (BSC), is derived. From this, it is apparent that the probability of accepting an erroneous block is not a monotonic function of the bit error probability, but rather reaches a peak of 5.653 percent when the bit error probabilit... View full abstract»

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  • Differential Detection of Narrow-Band Binary FM

    Publication Year: 1985, Page(s):725 - 729
    Cited by:  Papers (9)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    In this paper we consider differential detection of narrowband binary FM, using a detector which utilizes a delay line whose delay period is dependent on the value of the modulation index. The error-rate performance is computed for this receiver and compared with that of the limiter-discriminator receiver. In contrast to the previously published results for one-bit delay differential detection, it... View full abstract»

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  • A Further Investigation of Max's Algorithm for Optimum Quantization

    Publication Year: 1985, Page(s):746 - 750
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    Although Max's algorithm is frequently thought of as a simple and adequate method for the design of scalar minimum mean squared error quantizers, there are two tactical problems associated with this iterative scheme: the initialization and the updating of the algorithm. This paper proposes easy and efficient solutions to these problems. A straightforward method for obtaining good initial condition... View full abstract»

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  • The Optimal Retry Distribution for Lightly Loaded Slotted Aloha Systems

    Publication Year: 1985, Page(s):724 - 725
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    Most of the analytical work on slotted Aloha has been concerned with maximizing the utilization. The delay experienced by a transmission has not been a primary issue. In this note we take the opposite point of view. It is assumed that the system is operating far below capacity (as is typical in practice), and we concern ourselves with the problem of minimizing packet delay in the event of a collis... View full abstract»

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  • On the Performance of Speech Waveform Coders with Noise Spectral Shaping

    Publication Year: 1985, Page(s):742 - 746
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    The performance of speech waveform coders that incorporate a noise spectral shaping filter is discussed. The coders studied are adaptive pulse code modulation (APCM), adaptive differential PCM (ADPCM), and adaptive delta modulation (ADM). For APCM and ADPCM, the noise shaping filter is designed to minimize the C-message weighted quantization noise power. As for ADM, the noise shaping filter is use... 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