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IEEE Transactions on Communications

Issue 3 • March 1987

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Displaying Results 1 - 21 of 21
  • [Front cover and table of contents]

    Publication Year: 1987, Page(s): 0
    Request permission for commercial reuse | PDF file iconPDF (207 KB)
    Freely Available from IEEE
  • Improved Methods of Accelerating the Convergence of Adaptive Equalizers for Partial-Response Signals

    Publication Year: 1987, Page(s):257 - 260
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (331 KB)

    In order to accelerate the convergence of adaptive equalizers for partial-response signals it is necessary to transform the input signal, and use the transformed values in one of two ways-to calculate both the equalizer output and the tap updates, or to calculate only the tap updates. These methods are called double-sided and single-sided orthogonalizalion, respectively; this paper confirms previo... View full abstract»

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  • Digital Radio Performance When the Transmitter Spectral Shaping Follows the Power Amplifier

    Publication Year: 1987, Page(s):261 - 266
    Cited by:  Papers (13)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (630 KB)

    We analyze a digital radio link in which rectangular RF data pulses drive the high-power amplifier (HPA) and spectral shaping of the transmission is done after the HPA. The purpose of the analysis is to quantify detection performance for a variety of design possibilities. These include two approaches to predistortion in the transmitter and two ways of setting decision boundaries in the receiver. A... View full abstract»

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  • Polling with a General-Service Order Table

    Publication Year: 1987, Page(s):283 - 288
    Cited by:  Papers (55)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (598 KB)

    This paper derives exact results for a polling system such as a token bus or token ring with exhaustive service and priority polling. The results can also be used to analyze a terminal controller with a generalservice order table. There areNstations in the system and the token is passed among them according to a polling table of lengthM (geq N). Stations are given higher prio... View full abstract»

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  • Motion-Compensated Coder for Videoconferencing

    Publication Year: 1987, Page(s):297 - 304
    Cited by:  Papers (27)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (814 KB)

    A codec for videoconferencing purposes [8]-[12], [31] is proposed based on the one-at-a-time search (OTS) motion compensation algorithm [1], [30], [31]. The coder is implemented in an interframe hybrid mode using theC-matrix transform (CMT) [13]-[15]. The motion estimation algorithm employed is simple and reduces temporal redundancy, while the CMT reduces spatial redundancy in the trans... View full abstract»

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  • Bounds on the Cross-Correlation Functions of State m-Sequences

    Publication Year: 1987, Page(s):305 - 312
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (780 KB)

    The performance of the periodic Hamming correlation function of the sequences of states ofm-sequence simple linear feedback shift register generators is evaluated. We call these sequences statemsequences. Theoretical lower and upper bounds on the peaks of the Hamming cross-correlation functions of those sequences, which are often used in frequency-hopped spread-spectrum syste... View full abstract»

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  • Bandwidth Compressive 16-State SQAM Modems Through Saturated Amplifiers

    Publication Year: 1987, Page(s):339 - 345
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (562 KB)

    The performance of new bandwidth compressive 16 SQAM (Superposed-QAM) modems, operating in a highly power-efficient saturation mode, is analyzed. Nonlinearly amplified 16 SQAM retains the out-of-band energy much lower than 4-level rectangular (i.e., 16 QAM) or sinusoidal shaped (i.e., MAMSK) QAM, and operates within 0.7 dB of theoretical (i.e., 16 QAM in Nyquist linear channel) performance at... View full abstract»

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  • DCTPSK - Differentially Detected Controlled Transition PSK

    Publication Year: 1987, Page(s):349 - 352
    Cited by:  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (411 KB)

    An efficient modem is introduced for system applications which favor differential detection techniques. In differentially detected controlled transition PSK (DCTPSK), pulse-shaping techniques are used to achieve bandwidth and power efficiency in nonlinear channels. The baseband waveshapes, eye diagrams, and signal space diagram of DCTPSK are given; its bit error rate performance is calculated and ... View full abstract»

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  • On the Number of Switching Modes Generated by Time-Optimal Algorithms for SS/TDMA Systems

    Publication Year: 1987, Page(s):359 - 362
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (374 KB)

    An important parameter related to the efficiency of algorithms for data transmission on SS/TDMA systems is the number of switching modes they generate. It is shown in this note that time-optimal algorithms produce the maximum number of switchings only if the transmission durationLis exponential inN, whereNis the number of channels. This result explains the good per... View full abstract»

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  • [Back cover]

    Publication Year: 1987, Page(s): 0
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    Freely Available from IEEE
  • A Transmission Scheme for Integrated Services on Broad-Band Internal Private Business Networks

    Publication Year: 1987, Page(s):328 - 335
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (800 KB)

    Internal business networks are expected to present an economic area of application for broad-band communications. A star network with switches optimized for various services is envisaged. An asynchronous switch for video in square wave frequency modulation (SWFM) format can provide a practical solution for full bandwidth switched video services. A transmission scheme is described which combines a ... View full abstract»

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  • Videoconference Traffic and Network Design

    Publication Year: 1987, Page(s):275 - 282
    Cited by:  Papers (8)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (832 KB)

    Recent technological progress is making possible the creation of a new form of videoconference service based on a public network interconnecting private studios located on user premises. We suppose that transmission links in such a network would be reserved in advance by users as and when they arrange their meeting. This and other significant differences with telephony-like services make the use o... View full abstract»

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  • Baseband Equalization and Carrier Recovery in Digital Radio Systems

    Publication Year: 1987, Page(s):319 - 327
    Cited by:  Papers (16)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (912 KB)

    The influence of adaptive baseband equalization on decision-feedback carrier recovery performance is investigated. First, it is shown that the delay introduced by the equalizer in the carrier recovery loop does not have basic consequences on system performance. Second, the interaction between the two adaptive circuits is studied for four different equalizer adaptation algorithms. It is found that ... View full abstract»

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  • Delay Analysis Under a General Cut-Through Switching Technique in Computer Networks

    Publication Year: 1987, Page(s):356 - 359
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    A general cut-through switching (GCTS) technique is proposed and analyzed. In GCTS, a message may cut through a node if the node becomes free before the message is completely received there. Under the GCTS mechanism, a message may cut through a node even though the node has more than one message in it. This results in minimizing the end-to-end delay time of messages as compared to the other cut-th... View full abstract»

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  • Throughput Analysis in Multihop CSMA Packet Radio Networks

    Publication Year: 1987, Page(s):267 - 274
    Cited by:  Papers (149)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (992 KB)

    In this paper, we use a Markov model to develop a product form solution to efficiently analyze the throughput of arbitrary topology multihop packet radio networks that employ a carrier sensing multiple access (CSMA) protocol with perfect capture. We consider both exponential and nonexponential packet length distributions. Our method preserves the dependence between nodes, characteristic of CSMA, a... View full abstract»

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  • An Algorithm for an Adaptive Multifrequency Receiver

    Publication Year: 1987, Page(s):345 - 349
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    This paper presents a simple and effective algorithm for an adaptive multifrequency receiver that can be used for several types of multifrequency signals. This algorithm uses the ability of frequency detection of signal processing using extreme and zero-crossing points in the multifrequency signals and an adaptive second-order notch filter. View full abstract»

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  • BTC Image Coding Using Vector Quantization

    Publication Year: 1987, Page(s):352 - 356
    Cited by:  Papers (59)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (616 KB)

    This paper describes source encoding of the outputs of a block truncation coder (BTC), namely, the overhead statistical information and the truncated block. The statistical overhead and the truncated block exhibit properties which can be effectively used for their quantization as vectors. Vector quantization of these BTC outputs results into reduction of the bit rate of the coder. The bit rate red... View full abstract»

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  • An Efficient DFE & ML Suboptimum Receiver for Data Transmission Over Dispersive Channels Using Two-Dimensional Signal Constellations

    Publication Year: 1987, Page(s):336 - 339
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    The DFE & ML receiver is presented for data transmission systems using QAM modulation. A substantial improvement in performance results as compared to other one- or two-stage receiver structures at relatively low computational complexity. View full abstract»

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  • Content-Driven Progressive Transmission of Grey-Scale Images

    Publication Year: 1987, Page(s):289 - 296
    Cited by:  Papers (22)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1216 KB)

    A lossless progressive transmission method for grey-scale images which concentrates early transmission efforts on areas of greater image information content is described. The receiver does not have a priori knowledge of which image areas are to receive preferential treatment, and the preferential level of resolution is the pixel. The method makes use of simultaneous geometric and information conte... View full abstract»

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  • Blocking Probabilities for Trunk Reservation Policy

    Publication Year: 1987, Page(s):313 - 318
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    This paper presents an analysis of the blocking phenomenon in circuit-switched routing policies with alternate routing and trunk reservation. From the usual assumptions on the offered traffic (Poisson) and the service time (exponential distribution), a classical Markov chain model is derived. Some approximate formulas are given to compute the blocking probabilities for first- and second-choice tra... View full abstract»

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  • Packet-Switched Performance with Different Circuit-Switched Routing Procedures in Nonhierarchical Integrated Circuit-Switched and Packet-Switched Networks

    Publication Year: 1987, Page(s):362 - 366
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (728 KB)

    It is shown in [13] that different types of routing procedures for circuit-switched traffic in a nonhierarchical network exhibit various performance tradeoffs. It is, however, not clear if the network is also allowed to carried packet-switched traffic, how the packet-switched traffic will be affected by using different routing procedures for the circuit-switched traffic. In this paper, we examine ... 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