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IEEE Transactions on Communications

Issue 9 • Date Sept. 1991

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Displaying Results 1 - 17 of 17
  • Comments on "Narrow-band interference rejection using real-time Fourier transforms

    Publication Year: 1991, Page(s):1292 - 1294
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (244 KB)

    In their paper on narrow-band interference excision in DS-SS systems D. Davidovici and E.G. Kanterakis (ibid., vol.37, p.713-22, 1989) concluded that excision need not improve the bit-error rate at high-interference levels. It is argued that while this conclusion follows from the specific cases examined, it does not apply to more realistic spread-spectrum system designs.<> View full abstract»

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  • The performance of phase locked transparent tone-in-band with symmetric phase detection

    Publication Year: 1991, Page(s):1389 - 1399
    Cited by:  Papers (15)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (804 KB)

    Transparent tone-in-band (TTIB) creates a spectral gap by splitting a signal into frequency bands, which are then separated by modulation. Phase locked transparent-tone-in-band (PLTTIB), in its original form, contained an unacceptably high level of self-noise in the coherent band recombination process. A performance analysis of PLTTIB with symmetric phase detection is given. Several new results ar... View full abstract»

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  • Binomial-gated service: a method for effective operation and optimization of polling systems

    Publication Year: 1991, Page(s):1341 - 1350
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (724 KB)

    The binomial-gated service, designed for cyclic polling systems, is proposed as a new service method. The important properties of this method are: (1) it allows one to prioritize the system queues using a set of priorities, and (2) it is mathematically analyzable. The method can be implemented in the token ring network and in many other communications systems. The nonsymmetric cyclic-polling syste... View full abstract»

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  • Ill-convergence of Godard blind equalizers in data communication systems

    Publication Year: 1991, Page(s):1313 - 1327
    Cited by:  Papers (130)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1124 KB)

    The existence of stable undesirable equilibria for the Godard algorithm is demonstrated through a simple autoregressive (AR) channel model. These undesirable equilibria correspond to local but nonglobal minima of the underlying mean cost function, and thus permit the ill-convergence of the Godard algorithms which are stochastic gradient descent in nature. Simulation results confirm predicted misbe... View full abstract»

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  • Block transform image coding by multistage vector quantization with optimal bit allocation

    Publication Year: 1991, Page(s):1360 - 1369
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (988 KB)

    A multistage vector quantization with optimal bit allocation (MVQ-OBA) in the transform domain is presented. A set of bit allocation planes is first obtained by slicing a (scalar) optimal bit allocation map where the number of bits assigned to each coefficient is proportional to the coefficient variance. The set of bit allocation planes determines the coefficients to be used and the codebook size ... View full abstract»

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  • The sampling resource allocation problem

    Publication Year: 1991, Page(s):1277 - 1279
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (220 KB)

    A sampling resource allocation problem formulation for determining the optimal sample size for each of multiple sampling activities competing for a single sampling resource is described. The problem is formulated as a nonlinear knapsack problem with lower and upper binding restrictions. The objective function based on the squared coefficient of variation is used for the real-time performance monit... View full abstract»

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  • An optimal distributed routing algorithm

    Publication Year: 1991, Page(s):1379 - 1388
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (592 KB)

    A distributed optimal one-level routing algorithm is presented. The algorithm is based on Newton's method. Using the variable reduction method, the Hessian matrix becomes diagonal. An example shows that the algorithm has a much faster convergence rate, more accurate results, and better transient behavior than previous work. The algorithm is shown to be convergent, stable, robust, and loop free View full abstract»

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  • A suboptimum linear receiver based on a parametric channel model

    Publication Year: 1991, Page(s):1328 - 1334
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (508 KB)

    A suboptimum, linear, minimum mean-squared error (MMSE) data communication receiver that is based on a parametric model for a linear, time-invariant, or slowly time-varying channel is shown to perform well at reasonable input signal-to-noise ratios (SNRs) and for short training periods. The receiver makes use of a fractionally spaced equalizer (FSE) design whose time span is a single symbol period... View full abstract»

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  • Smoothed DPCM codes

    Publication Year: 1991, Page(s):1351 - 1359
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (672 KB)

    Interpolative differential pulse code modulation (IDPCM) is known to outperform DPCM at rate 1 b/sample for several synthetic source models. The authors use minimum-mean-squared error (MMSE) fixed-lag smoothing with DPCM to develop a code generator using delayed decoding. This smoothed DPCM (SDPCM) code generator is compared to DPCM and IDPCM code generators at rates 1 and 2 b/sample for tree codi... View full abstract»

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  • Probability of error in frequency-hop spread-spectrum multiple-access communication systems with noncoherent reception

    Publication Year: 1991, Page(s):1400 - 1410
    Cited by:  Papers (38)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (784 KB)

    Expressions are developed for the probability of error for asynchronous frequency-hop spread-spectrum multiple-access networks using Markov hopping patterns and binary frequency shift keying (BFSK) with one symbol transmitted per hop. The expressions are exact when there is one interfering user and orthogonal BFSK is used. They provide excellent approximations when there are more than one interfer... View full abstract»

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  • A computationally efficient iterative solution of the multidestination optimal dynamic routing problem

    Publication Year: 1991, Page(s):1370 - 1378
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (700 KB)

    The dynamic routing problem for multiple destination networks is considered. The minimum time rather than total delay cost functional is employed. The problem is solved through an iterative link-by-link optimization. Each link capacity is optimally partitioned by examining the upper bounds for the evacuation time imposed through different capacity allocations for each origin/destination pair traff... View full abstract»

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  • Analysis and modeling of time intervals between rain rate exceedances in the context of fade dynamics

    Publication Year: 1991, Page(s):1306 - 1312
    Cited by:  Papers (1)  |  Patents (101)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (540 KB)

    Using a 49 year point rainfall rate databank the authors present the analysis and statistical modeling of the interval of time between exceedances of rainfall rate thresholds within the context of rain fade dynamics and system availability. The study distinguishes between successive exceedances occurring at different rain events. The global study of both return periods or intervals is also present... View full abstract»

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  • Measurement, modeling, and simulation of digital LOS microwave channels with applications to outage prediction

    Publication Year: 1991, Page(s):1295 - 1305
    Cited by:  Papers (8)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (972 KB)

    A summary of prior work in the field of microwave line-of-sight (LOS) channel propagation measurements, channel models, and channel simulators is presented. The objective of these efforts is the reliable prediction of digital microwave radio performance on any specified link. Many digital radio outage prediction techniques are predicted upon the use of m-curves, which characterize a digit... View full abstract»

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  • Multilayer subband-based video coding

    Publication Year: 1991, Page(s):1288 - 1291
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    A motion compensated interframe subband coding algorithm suitable for a wide range of video coding applications is described. In this approach the spectrum of each frame of video signal is first decomposed into smaller frequency bands where each can then be coded accordingly. For the best performance a combination of hybrid DCT/DPCM (discrete cosine transform/differential pulse code modulation), i... View full abstract»

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  • Differentially coherent detection of binary partial response continuous phase modulation with index 0.5

    Publication Year: 1991, Page(s):1335 - 1340
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    The performance of binary partial response continuous phase modulation (with index 0.5) using a differentially coherent receiver depends on the choice of the receiver filter. An optimum MMSE design method for this filter is presented. The receiver filter is equivalent to the cascade of a matched filter and an equalizer in order to reduce inherent intersymbol interference (ISI). It is shown that pe... View full abstract»

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  • BTC-VQ-DCT hybrid coding of digital images

    Publication Year: 1991, Page(s):1283 - 1287
    Cited by:  Papers (13)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (564 KB)

    A hybrid BTC-VQ-DCT (block truncation coding, vector quantization, and discrete cosine transform) image coding algorithm is presented. The algorithm combines the simple computation and edge preservation properties of BTC and the high fidelity and high-compression ratio of adaptive DCT with the high-compression ratio and good subjective performance of VQ, and can be implemented with significantly l... View full abstract»

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  • Exact formula for the minimum squared Euclidean distance of CPFSK

    Publication Year: 1991, Page(s):1280 - 1282
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (188 KB)

    The exact expression for the minimum-squared Euclidean distance of continuous-phase frequency-shift keying (CPFSK) with modulation index h⩽1/2 is derived 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