IEEE Transactions on Communications

Issue 9 • September 1986

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  • [Front cover and table of contents]

    Publication Year: 1986, Page(s): 0
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    Freely Available from IEEE
  • Noncoherent Hybrid DS-SFH Spread-Spectrum Multiple-Access Communications

    Publication Year: 1986, Page(s):862 - 872
    Cited by:  Papers (64)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (989 KB)

    The performance of noncoherent reception in synchronous and asynchronous hybrid direct-sequence/slow-frequency-hopped spread-spectrum multiple-access communication systems operating through additive white Gaussian noise channels is investigated. Systems with binary andM-ary frequency-shift-keying modulation and noncoherent demodulation, as well as systems with differential-phase-shift k... View full abstract»

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  • Joint Carrier Phase Estimation and Data Detection Algorithms for Multi-h CPM Data Transmission

    Publication Year: 1986, Page(s):873 - 881
    Cited by:  Papers (20)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (794 KB)

    A dynamic programming algorithm, developed in [1]-[4] for obtaining the joint estimate of carrier phase and data, is applied to multihcontinuous phase modulation. A MAP estimator detects data and jointly tracks carrier phase consisting of a normal random walk phase jitter process. Monte Carlo computer simulations are used to evaluate the probability of error performance for two receiver... View full abstract»

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  • Performance Analysis of a Quasi-M/D/1 Cut-Through Switching Network with Noisy Channels

    Publication Year: 1986, Page(s):882 - 889
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (722 KB)

    Cut-through switching is advantageous in that it can reduce the transmission delay compared with the conventional message or packet switching. In this paper, when the channel is noisy, we investigate various properties ofM/D/1quasi-cut-through switching including actual traffic intensity and overall network delay. In the analysis of delay resulting from retransmission of erroneous packe... View full abstract»

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  • Meteor Burst Communications: Bits per Burst Performance Bounds

    Publication Year: 1986, Page(s):927 - 936
    Cited by:  Papers (26)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (738 KB)

    It is important for communications researchers and designers to understand the limitations of the media that they use. To enable a better understanding of meteor trails as a communications medium, classical received power equations were used to derive two performance bounds. These give the maximum number of bits that can be relayed during a single burst using 1)an optimum constant bit rate, and 2)... View full abstract»

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  • The SRUC Protocol for Satellite Packet Communication - A Performance Analysis

    Publication Year: 1986, Page(s):937 - 945
    Cited by:  Papers (1)  |  Patents (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (840 KB)

    SRUC is an adaptive multiple access protocol which combines the slotted ALOHA protocol and a reservation protocol; it switches from one to the other according to the state of the channel. This paper studies SRUC with a go-back-NARQ scheme (SRUC/GBN) in a satellite communication environment to improve the performance over SRUC with a stop-and-wait ARQ scheme (SRUC/SAW) previously studied... View full abstract»

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  • A Novel Concept for High-Speed Time Switch Approaching Memory Read Cycle Limit

    Publication Year: 1986, Page(s):953 - 955
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    A novel concept and structure for a high-speed time division switch operating in the gigabit/second range are presented. The basic concept is to use the high-speed memory in the time switch effectively by means of a slow writing/fast reading method.Nnumbers of speech data are written in parallel duringNclock times and read serially during one clock time for one switched datum... View full abstract»

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  • [Back cover]

    Publication Year: 1986, Page(s): 0
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    Freely Available from IEEE
  • An Analysis of Error Behavior in the Implementation of 2-D Orthogonal Transformations

    Publication Year: 1986, Page(s):973 - 975
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    The paper analyzes the effect of finite-length arithmetic in the calculation of 2-D linear transformations employed in some picture coding algorithms. Since the condition of zero-error in general direct and reverse transformations leads to results of little practical importance, an analysis is carried out on the statistical properties of error in 2-D linear transformation with given length of arit... View full abstract»

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  • Analysis of Group 4 Facsimile Throughput

    Publication Year: 1986, Page(s):849 - 861
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1096 KB)

    The CCITT (Consultive Committee for International Telephone and Telegraph) is developing recommendations for a new generation of facsimile equipment which is designed as Group 4. This class of equipment will transmit an ISO A4-sized page overcommunications networks having error control. Most commercial packet switched and circuit data networks have been designed primarily for the communications of... View full abstract»

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  • Some Remarks on the Asymptotic Behavior of the Lengths of a Collision Resolution Interval

    Publication Year: 1986, Page(s):962 - 965
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    We present an operator method for obtaining upper and lower bounds for the expected length of a collision resolution interval for various protocols. The method is elementary in that it circumvents the intricate and ingenious complex variable methods of Fayolle, Flajolet, and Hofri [2]. It is also noted that the method can be applied to computing bounds for the delay. A conjecture of Massey's and s... View full abstract»

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  • Optimum Multiuser Asymptotic Efficiency

    Publication Year: 1986, Page(s):890 - 897
    Cited by:  Papers (244)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (832 KB)

    The degradation in bit error rate due to the presence of multiple-access interference in a white Gaussian channel can be measured by the multiuser asymptotic efficiency, defined as the ratio between the SNR required to achieve the same uncoded bit error rate in the absence of interfering users and the actual SNR. In this paper, the asymptotic efficiency of the optimum multiuser demodulator (a bank... View full abstract»

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  • On the Choice of an Efficient TV Energy Dispersal Waveform for Interference Reduction

    Publication Year: 1986, Page(s):965 - 969
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    Interference from carriers which are frequency modulated by a spreading waveform is examined. A mixed spreading waveform, obtained by adding a line rate component to a frame rate component, is proposed. This spreading is shown to combine advantages which are offered by line rate and frame rate when used separately. View full abstract»

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  • Packet Voice on a Local Area Network with Round Robin Service

    Publication Year: 1986, Page(s):906 - 915
    Cited by:  Papers (27)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1136 KB)

    In this paper, we propose a combined voice/data protocol suitable for multiple access broadcast networks that provide round robin service to the stations. Such networks are well suited to the integration of voice and data since they guarantee bounded delay and provide high utilization even for high bandwidth channels. Using one such network proposal-namely Expressnet-as a representative scheme, we... View full abstract»

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  • Queueing Analysis of Buffered CSMA/CD Protocols

    Publication Year: 1986, Page(s):898 - 905
    Cited by:  Papers (31)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (808 KB)

    In this paper, we propose a new queueing model appropriate for the analysis of a buffered CSMA/CD protocol. We assume that each user has a finite buffer capacity. The system, in general, can be modeled as a multidimensional semi-Markov chain. The enormous state space for the complete description is reduced by appropriate exploitation of the features of the system, e.g., fairness towards all users,... View full abstract»

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  • Delay Analysis of 0.487 Contention Resolution Algorithms

    Publication Year: 1986, Page(s):916 - 926
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (856 KB)

    We derive upper and lower bounds to the curve of expected delay versus throughput for the delay-enhanced version of the celebrated 0.487 multiple access contention resolution algorithm. The key to the derivation is a technique for generating upper and lower bounds to monotonic functions of the transmission lag via corresponding bounds on the kernel of the integral equation for the distribution of ... View full abstract»

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  • Minimax Noncoherent Detection of BFSK Signals in Nonwhite Gaussian Noise

    Publication Year: 1986, Page(s):955 - 958
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    We derive an optimum receiver for noncoherent detection of binary frequency shift keyed (BFSK) signals in nonwhite Gaussian noise. It will be shown that the achieved symbol error rates are smaller when operating on a nonwhite Gaussian noise channel than on a white Gaussian noise channel. The well-known BFSK receiver designed for white noise proves to be a minimax receiver when used in nonwhite noi... View full abstract»

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  • Nonlinear Techniques for the Improvement of Signal-to-Noise Ratio

    Publication Year: 1986, Page(s):969 - 973
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (784 KB)

    We propose a novel circuit for noise rejection, which is composed mainly of a linear amplifier, a nonlinear amplifier, and a filter. The input signal is applied to a linear amplifier, a bandpass limiter, and an envelope detector followed by a low-pass filter. The output of the lowpass filter is multiplied by the output of the bandpass limiter. The difference between the output of the multiplier an... View full abstract»

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  • The Effect of Tree Cover on Air-Ground, VHF Propagation Path Loss

    Publication Year: 1986, Page(s):958 - 962
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    A theory accounting for attenuation caused by tree cover for line-of-sight propagation paths at VHF using vertical polarization is presented. An approach to implementing this theory using a terrainsensitive GTD propagation model is also given. Comparisons of model predictions and airborne measurements show that the approach is valid. View full abstract»

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  • Image Reconstruction in a Wide Aspect Ratio HDTV System

    Publication Year: 1986, Page(s):946 - 952
    Cited by:  Papers (4)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (840 KB)

    One of the important characteristics of a high-definition television (HDTV) image is a wide aspect ratio. In some HDTV systems the image is segmented and different formats are used to transmit portions of the image. We address the problem of image reconstruction at the receiver and present an analysis of a wide aspect ratio HDTV system. Several image reconstruction techniques are described, includ... 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