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IEEE Transactions on Communications

Issue 12 • Date December 1985

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Displaying Results 1 - 17 of 17
  • [Front cover and table of contents]

    Publication Year: 1985, Page(s): 0
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    Freely Available from IEEE
  • Editorial

    Publication Year: 1985, Page(s): 1233
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    Freely Available from IEEE
  • On Broadcasting in Radio Networks - Problem Analysis and Protocol Design

    Publication Year: 1985, Page(s):1240 - 1246
    Cited by:  Papers (135)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (844 KB)

    In this paper we develop a graph-oriented model for dealing with broadcasting in radio networks. Using this model, optimality in broadcasting protocols is defined, and it is shown that the problem of finding an optimal protocol is NP-hard. A polynomial time algorithm is proposed under which a channel is assigned to nodes from global, multiple-source broadcasting considerations. In particular, node... View full abstract»

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  • [Back cover]

    Publication Year: 1985, Page(s): 0
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    Freely Available from IEEE
  • Noise Loading Analysis in FDM Systems

    Publication Year: 1985, Page(s):1319 - 1323
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    This paper investigates the characterization of nonlinear distortion produced in FDM systems under high-frequency operation, by using noise loading techniques. By employing a general Volterra-based model, the paper develops an appropriate noise loading technique for the assessment of nonlinear distortion in such wide-band transmission systems. The advantage of using Volterra series representation ... View full abstract»

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  • Fixed and Adaptive Predictors for Hybrid Predictive/Transform Coding

    Publication Year: 1985, Page(s):1291 - 1302
    Cited by:  Papers (16)  |  Patents (69)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1848 KB)

    Hybrid predictive/transform coding is studied. The usual formulation is to first apply a unitary transform and then code the transform coefficients with independent DPCM coders, i.e., the prediction is performed in the transform domain. This structure is compared to spatial domain prediction, where a difference signal is formed in the spatial domain and then coded by a transform coder. A linear sp... View full abstract»

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  • Augmented Lagrangean Based Algorithms for Centralized Network Design

    Publication Year: 1985, Page(s):1247 - 1257
    Cited by:  Papers (64)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1112 KB)

    Capacitated spanning tree problems appear frequently as fundamental problems in many communication network design problems. An integer programming formulation and a new set of valid inequalities are presented for the linear characterization of the problem. A combination of a subgradient optimization procedure and an augmented Lagrangean-based procedure is used to generate tight lower bounds. The p... View full abstract»

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  • Performance of MRC Diversity Systems for the Detection of Signals with Nakagami Fading

    Publication Year: 1985, Page(s):1315 - 1319
    Cited by:  Papers (109)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    Bit error rate (BER) is analyzed theoretically for diversity reception in Nakagami fading environment using an M -branch maximal ratio combiner (MRC). Coherent and incoherent reception of frequency shift keying (FSK) are considered, using the multiple branch diversity system for both identical and different diversity branch fading parameters. The effect of corr... View full abstract»

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  • Performance of Voice/Data Integration on a TDM System

    Publication Year: 1985, Page(s):1265 - 1273
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (840 KB)

    Data queueing is of primary concern in a voice/data integrated TDM system. The data queueing model is represented in the discrete-time domain with multiple servers and voice is given a higher priority than data. The data arrival process is assumed to be Poisson and the voice arrival process is characterized by a Markov chain. The correlation coefficient of the number of on voice calls between cons... View full abstract»

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  • Quadrature Vestigial Sideband (QVSB) Data Transmission

    Publication Year: 1985, Page(s):1274 - 1280
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (632 KB)

    The combined use of quadrature modulation and vestigial sideband filtering is investigated as a means of obtaining a spectrally efficient modulation scheme. The name quadrature vestigial sideband (QVSB) aptly describes the new system, whereby two independent data streams are each VSB modulated into the same passband, but on quadrature related carriers. The inherent interference between the quadrat... View full abstract»

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  • Negatively Correlated Diversity Branches Using Various Modulation Methods and Maximal Ratio Combining

    Publication Year: 1985, Page(s):1323 - 1326
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    A diversity system using maximal ratio combining, and in which the diversity branches are negatively correlated, is considered. The performance of some digital systems, namely PSK, DPSK, CFSK, and NFSK, are compared. The error probability as a function of frequency differences between the branches is given. Also, error probability averaged over time delay difference τ is given as a function o... View full abstract»

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  • Low Complexity Carrier Phase Tracking Decoders for Continuous Phase Modulations

    Publication Year: 1985, Page(s):1285 - 1290
    Cited by:  Papers (15)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (624 KB)

    Phase tracking capability is incorporated into two sequence estimation decoders for continuous phase modulations. One decoder employs the Viterbi algorithm; the other uses a reduced-survivor approach proposed earlier by one of the authors [11] for the more bandwidth efficient of these modulations. Computational complexity with the simplest of the joint data/phase algorithms is only marginally grea... View full abstract»

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  • Performance Analysis of PCM/ADPCM Transcoding Systems

    Publication Year: 1985, Page(s):1303 - 1308
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    In this paper, the performances of PCM/ADPCM transcoding systems are analyzed. The coders studied are the 64 kbit/s PCM with μ-255 companding law and the 32 kbit/s ADPCM proposed by Cummiskey et al. The theoretically predicted performance agrees closely with the results of computer simulation for a wide range of input signal level. According to the results, the performance degradation resulti... View full abstract»

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  • The Influence of Phase-Dependent Loop Noise on the Cycle Slipping of Symbol Synchronizers

    Publication Year: 1985, Page(s):1234 - 1239
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    The spectral density of the loop noise in the equivalent loop model of a symbol synchronizer depends on the phase error. Although this dependence has only a minor influence on the linearized mean-square synchronization error, we demonstrate that it has a major effect on the mean cycle slip time of the symbol synchronizer. A simple approximate expression for the mean cycle slip time is presented, b... View full abstract»

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  • Synchronous Tandem Algorithm for 32-kbit/s ADPCM

    Publication Year: 1985, Page(s):1309 - 1314
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (648 KB)

    The synchronous tandem property of nonaccumulation of distortion in tandem-connected ADPCM coders with a 64 kbit/s PCM interface is discussed here. The synchronous tandem algorithm used to provide this property in the steady-state mode is described with a case-by-case analysis, so as to show how the synchronous tandem property is realized in an ADPCM coder. A 32 kbit/s ADPCM coder utilizing this a... View full abstract»

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  • Prevention of Store-and-Forward Deadlock in Computer Networks

    Publication Year: 1985, Page(s):1258 - 1264
    Cited by:  Papers (30)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (880 KB)

    Much previous work has been done on the prevention of store-and-forward deadlock in computer networks using buffer reservation. The emphasis has been on reducing the number of reserved buffers necessary in each node. In this paper, we propose a scheme that, for most networks, will guarantee deadlock freedom for any arbitrary routing with a third fewer reserved buffers than the best previously prop... View full abstract»

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  • Adaptive Estimator of a Filter and Its Inverse

    Publication Year: 1985, Page(s):1281 - 1284
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    This paper describes the LMS adaptive filter which compensates for the effect of a linear filter on a signal. The problem that we had to solve was to compensate a propagation channel with an adaptive filter, which has to be connected in series and in front of the channel. The adaptive filter estimates simultaneously the filter response and its inverse. We show the computer simulations of this syst... 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