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IEEE Transactions on Communications

Issue 4 • Date April 1985

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Displaying Results 1 - 14 of 14
  • [Front cover and table of contents]

    Publication Year: 1985, Page(s): 0
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    Freely Available from IEEE
  • Adaptive Lattice Decision-Feedback Equalizers - Their Performance and Application to Time-Variant Multipath Channels

    Publication Year: 1985, Page(s):348 - 356
    Cited by:  Papers (66)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (933 KB)

    This paper presents two types of adaptive lattice decisionfeedback equalizers (DFE), the least squares (LS) lattice DFE and the gradient lattice DFE. Their performance has been investigated on both time-invariant and time-variant channels through computer simulations and compared to other kinds of equalizers. An analysis of the self-noise and tracking characteristics of the LS DFE and the DFE empl... View full abstract»

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  • [Back cover]

    Publication Year: 1985, Page(s): 0
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    Freely Available from IEEE
  • Coding and Decoding for Code Division Multiple User Communication Systems

    Publication Year: 1985, Page(s):310 - 316
    Cited by:  Papers (20)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (792 KB)

    A new algorithm is introduced which decodes code division multiple user communication signals. The algorithm makes use of the distinctive form or pattern of each signal to separate it from the composite signal created by the multiple users. Although the algorithm is presented in terms of frequency-hopped signals, the actual transmitter modulator can use any of the existing digital modulation techn... View full abstract»

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  • Joint Baud and Frame Synchronization in Direct Detection Optical Communications

    Publication Year: 1985, Page(s):357 - 360
    Cited by:  Papers (20)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    The maximum-likelihood frame synchronizer was recently derived for direct-detection optical communications assuming baud synchronization. In this paper we present an extension to those results when pulse-position modulation is used and jointly derive baud and frame synchronization from slot synchronization. The optimum rule is seen to consist of a simple correlation term and a nonlinear correction... View full abstract»

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  • A Review of Models for Estimating 1 min Rainfall Rates for Microwave Attenuation Calculations

    Publication Year: 1985, Page(s):361 - 372
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1136 KB)

    A search for information on short-duration precipitation rates uncovered several sources of data, primarily for North America and Europe. However, the data available, especially for 1 min rainfall rates, are insufficient to permit direct calculation of precipitation-rate frequency distributions for all but a few locations in the world. Due to the need for these statistics for microwave attenuation... View full abstract»

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  • A Proposed Receiver Structure for Optical Communication Systems that Employ Heterodyne Detection and a Semiconductor Laser as a Local Oscillator

    Publication Year: 1985, Page(s):382 - 384
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    Coherent heterodyne detection in optical communication is degraded by phase instabilities present when a semiconductor laser is used as a local oscillator. Postdetection processing that accounts for these instabilities is suggested, based on a diffusion-process model for oscillator instabilities and a maximum-likelihood sequence-estimator of information symbols modulating the received light. View full abstract»

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  • Asymptotic Upper Bounds on the Minimum Distance of Trellis Codes

    Publication Year: 1985, Page(s):305 - 309
    Cited by:  Papers (23)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    A trellis code is a "sliding window" method of encoding a binary data stream as a sequence of signal points in Rn. When a trellis code is used to encode data at the rate of ... View full abstract»

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  • On "A Simple Protocol Whose Proof Isńt": The State Machine Approach

    Publication Year: 1985, Page(s):380 - 382
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    We discuss how to model a synchronous protocol (due to Aho, Ullman, and Yannakakis) using communicating finite state machines, and present a proof for its safety and liveness properties. Our proof is based on constructing a labeled finite reachability graph for the protocol. This reachability graph can be viewed as a sequential program whose safety and liveness properties can be stated and verifie... View full abstract»

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  • A Simple Protocol Whose Proof Isn't

    Publication Year: 1985, Page(s):330 - 337
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (848 KB)

    Aho, Ullman, and Yannakakis have proposed a set of protocols that ensure reliable transmission of data across an error-prone channel. They have obtained lower bounds on the complexity required of the protocols to assure reliability for different classes of errors. They specify these protocols with finite-state machines. Although the protocol machines have only a small number of states, they are no... View full abstract»

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  • A Predictor Switching Scheme for DPCM Coding of Video Signals

    Publication Year: 1985, Page(s):373 - 379
    Cited by:  Papers (11)  |  Patents (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    In DPCM coding of video signals, for improved data compression efficiency, the predictor is often switched adaptively between two or more different predictions. For low-bit-rate coders, the predictor switching is done on a pel-by-pel basis. In this paper, a new scheme for predictor switching on a pel-by-pel basis is proposed. This new scheme is a modification of an existing adaptive predictor swit... View full abstract»

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  • Simulation of a Multiprocessor Switching System Using Model Aggregation

    Publication Year: 1985, Page(s):325 - 329
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    Multiprocessor systems find wide application in telecommunications. Simulation techniques are often incorporated in the performance analysis of these systems. Simulation models enable an operating system to be represented in detail, e.g., multitasking, message handling, and concurrent processing. This level of detail is useful in evaluating software design. However, the complexity of such models c... View full abstract»

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  • Linear Receivers for Correlatively Coded MSK

    Publication Year: 1985, Page(s):338 - 347
    Cited by:  Papers (33)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (944 KB)

    In this paper we show that many spectrally efficient modified MSK schemes, termed generalized MSK, although not representable as OQPSK, may nevertheless be (suboptimally) demodulated using an I-Q receiver with a proper choice of carrier-phase offset. Correlatively coded MSK schemes with I-Q receivers are studied, and i... View full abstract»

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  • The Effect of Capture on Collision-Resolution Algorithms

    Publication Year: 1985, Page(s):317 - 324
    Cited by:  Papers (15)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (856 KB)

    In many communication systems, the stronger of two or more overlapping packets might capture the receiver and thus be received without error. The effect of capture on collision-resolution algorithms in a slotted ALOHA type broadcasting network is investigated here. Extensions to the algorithms are suggested for both the situations in which the receiver can or cannot distinguish between success slo... 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