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IEEE Transactions on Communications

Issue 9 • September 1981

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Displaying Results 1 - 25 of 28
  • [Front cover and table of contents]

    Publication Year: 1981, Page(s): 0
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    Freely Available from IEEE
  • Flow Control Power is Nondecentralizable

    Publication Year: 1981, Page(s):1301 - 1306
    Cited by:  Papers (22)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (634 KB)

    Flow control in store-and-forward computer networks is appropriate for decentralized execution. A formal description of a class of "decentralized flow control algorithms" is given. The feasibility of maximizing power with such algorithms is investigated. On the assumption that communication links behave likeM/M/1servers it is shown that no "decentralized flow control algorithm" can maxi... View full abstract»

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  • The Analysis of Some Selective-Repeat ARQ Schemes with Finite Receiver Buffer

    Publication Year: 1981, Page(s):1307 - 1315
    Cited by:  Papers (85)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (950 KB)

    In high bit rate data transmission systems with ARQ error control, the throughput efficiency is a function of bit error rate, block or packet size, and the effect of significant round trip delays such as may be experienced in satellite communication systems. The selective-repeat ARQ scheme is capable of providing superior throughput performance independent of round trip delay, but requires excessi... View full abstract»

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  • Effects of Multipath Propagation on Digital Radio

    Publication Year: 1981, Page(s):1345 - 1352
    Cited by:  Papers (48)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (763 KB)

    This paper summarizes experimental work at Bell Laboratories in the field of multipath propagation as it affects digital radio. Field and laboratory measurements are presented on commercial-quality high-speed digital radio systems working in the 4, 6, and 11 GHz common carrier bands. Circuits and equipment used in these systems are all state of the art, but no attempt has been made to describe the... View full abstract»

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  • An Accurate 8 Bit A/D Converter Sampling at 100 MHz

    Publication Year: 1981, Page(s):1353 - 1357
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    A very high-speed 8 bit A/D converter in which the sampling rate is 100 MHz has been developed. This converter is intended for application to a high-definition television (HDTV) system. The converter maintains high linearity even at high input frequencies. The basic configuration of the converter is a three-stage seriesparallel type. A digital correction system and ac coupling are used. The charac... View full abstract»

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  • Third-Order Intermodulation Due to Quantization

    Publication Year: 1981, Page(s):1386 - 1389
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (409 KB)

    When an input consisting of a strong signal and a weak signal is handled digitally, the resulting quantization introduces not only noise and distortion of the stronger signal (which have been thoroughly studied elsewhere) but also intermodulation between the two. Third-order intermodulation is the principal source of spurious inband signals, and it is important, therefore, to determine its strengt... View full abstract»

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  • Required Transmit Filter Bandwidths in Digital Radio Systems

    Publication Year: 1981, Page(s):1405 - 1408
    Cited by:  Papers (8)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (370 KB)

    Widely used digital radio modulations such as quaternary phase shift keying (QPSK), minimum shift keying (MSK), and sinusoidal frequency shift keying (SFSK) usually require some form of transmit filtering to ensure compliance with spectrum emission rules. Typically, radio transmit filters are of a specified type, such as fourthorder Butterworth, where the bandwidth parameter(beta)is a d... View full abstract»

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  • Correction to "Distributed Reservation Control Protocols for Random-Access Broadcasting Channels"

    Publication Year: 1981, Page(s): 1409
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (63 KB)

    First Page of the Article
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  • Correction to "Security Requirements and Protocols for a Broadcast Scenario"

    Publication Year: 1981, Page(s): 1409
    Cited by:  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (63 KB)

    First Page of the Article
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  • Correction to the Special Section on Computer Network Security of the June 1981 Issue

    Publication Year: 1981, Page(s): 1409
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (63 KB)

    First Page of the Article
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  • [Back cover]

    Publication Year: 1981, Page(s): 0
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    Freely Available from IEEE
  • The Structure of Quantization Noise from Sigma-Delta Modulation

    Publication Year: 1981, Page(s):1316 - 1323
    Cited by:  Papers (155)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    When the sampling rate of a sigma-delta modulator far exceeds the frequencies of the input signal, its modulation noise is highly correlated with the amplitude of the input. We derive simple algebraic expressions for this noise and its spectrum in terms of the input amplitude. The results agree with measurements taken on a breadboard circuit. This work can be useful for designing oversampled analo... View full abstract»

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  • Memory Management in a Viterbi Decoder

    Publication Year: 1981, Page(s):1399 - 1401
    Cited by:  Papers (101)  |  Patents (23)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    Management of the memory contents in a Viterbi decoder is a major design problem for both hardware and software realizations. In a naive implementation, every bit in the memory must be changed (read, modified, and rewritten) for each message bit decoded, and, in addition, some double buffering is required. An especially annoying feature is the need to read and rewrite long words, forty bits in a t... View full abstract»

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  • Combined Source-Channel Coding of Images Using the Block Cosine Transform

    Publication Year: 1981, Page(s):1261 - 1274
    Cited by:  Papers (92)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1632 KB)

    An approach is described for exploiting the tradeoffs between source and channel coding in the context of image transmission. The source encoder employs two-dimensional (2-D) block transform coding using the discrete cosine transform (DCT). This technique has proven to be an efficient and readily implementable source coding technique in the absence of channel errors. In the presence of channel err... View full abstract»

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  • Hybrid Companding Delta Modulation

    Publication Year: 1981, Page(s):1337 - 1344
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (672 KB)

    We present a reasonably complete account of an improved adaptive delta modulation (ADM) system called hybrid companding delta modulation (HCDM). The HCDM system that is far superior to continuously variable slope DM (CVSD) or constant factor DM (CFDM) is advantageous, particularly for speech coding. It employs both syllabic and instantaneous companding schemes. Performance analysis of the system h... View full abstract»

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  • On Second Moment Properties of Median Filtered Sequences of Independent Data

    Publication Year: 1981, Page(s):1374 - 1379
    Cited by:  Papers (43)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    In this paper we present the derivation of the bivariate distribution function for median filtered sequences of independent, arbitrary, second-order random variables. This result is then used to qualitatively analyze second moment properties of median filtered data. The results hint towards a low-pass characteristic of the median filters and a low dependency of the output spectrum on input alphabe... View full abstract»

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  • Sliding Block Decoding of Convolutional Codes

    Publication Year: 1981, Page(s):1401 - 1403
    Cited by:  Papers (16)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    It is shown that a convolutional code can be decoded with a sliding-block decoder, a time-invariant nonlinear digital filter with finite memory and delay. If the memory and delay are small, then the sliding-block decoder can be implemented as a table lookup procedure in ROM, resulting in a low cost, high speed, and high reliability decoder. View full abstract»

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  • Asymptotic Expansion for Erlang Loss Function and Its Derivative

    Publication Year: 1981, Page(s):1257 - 1260
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    This paper reveals the general structure of the asymptotic expansion for the Erlang loss function and its derivative. A recursive formula for the coefficients in the expansion is given and some of numerical examples are presented. The truncation error of the expansion is estimated and charts for calculation with the error less than 0.1 percent are shown. The present formula facilitates the calcula... View full abstract»

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  • Two-Channel Costas Loop Tracking Performance for UQPSK Signals with Arbitrary Data Formats

    Publication Year: 1981, Page(s):1275 - 1289
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (904 KB)

    This paper generalizes and corrects previous results on the tracking performance of two-channel Costas-type carrier synchronization loops. In particular, the mean-square phase jitter performance of these loops is evaluated when the data formats on the two channels are arbitrary. Particular attention is given to the case where the loops contain active arm filters with or without hard limiters follo... View full abstract»

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  • On the Performance of Binary Coded Signals

    Publication Year: 1981, Page(s):1403 - 1405
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    The bandwidth requirements of binary coded baseband signals are usually determined from spectral considerations. It is shown, by bit error rate calculations, that this approach can be misleading. The influence of pulse shapes on the performance of Miller, Manchester, and CRL codes is discussed. View full abstract»

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  • The Use of the Fourier-Bessel Series in Calculating Error Probabilities for Digital Communication Systems

    Publication Year: 1981, Page(s):1357 - 1365
    Cited by:  Papers (33)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (712 KB)

    Using the theory of spherical symmetric random vectors one can find an expression for the error probability of a wide variety of digital communications systems. These expressions, however, are in the form of Bessel integrals which are usually difficult to solve. In this paper we show how the Fourier-Bessel series can be used to solve the integrals numerically. The calculation error is found to dep... View full abstract»

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  • Digital Modulation in Rayleigh Fading in the Presence of Cochannel Interference and Noise

    Publication Year: 1981, Page(s):1379 - 1386
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (616 KB)

    The error rate performance of several digital modulation methods in a fading environment and in the presence of one cochannel interference and AWG noise is analyzed. A unique formula emerges for different PSK systems. It is shown how this information can be used in determining acceptable degradation caused by cochannel interference in the case of a digital mobile communication system. View full abstract»

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  • Two-Dimensional DPCM Image Coding Based on an Assumed Stochastic Image Model

    Publication Year: 1981, Page(s):1365 - 1374
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1248 KB)

    A new approach to the design of the feedback predictor in a two-dimensional (2-D) DPCM encoder is presented. This approach is based upon an assumed stochastic image model which exhibits the predominant and pronounced edge structure typical of real-world imagery and is in distinction from the conventional approach based upon 2-D autoregressive (AR) modeling assumptions. The performance of the resul... View full abstract»

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  • Analysis and Design of Hybrid Switching Networks

    Publication Year: 1981, Page(s):1290 - 1300
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1120 KB)

    This paper presents a methodology for the design of hybrid switching systems. Hybrid switching enables both circuit and packet-switched services to be provided in the same communication network. A model for the analysis of blocking and delay of a hybrid switching link is developed. The capacity assignment problem for hybrid-switched networks is also formulated and solution techniques developed. Th... View full abstract»

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  • The Design of an ADPCM/TASI System for PCM Speech Compression

    Publication Year: 1981, Page(s):1393 - 1398
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    This paper describes the design of a digital speech interpolation (DSI) system called ADPCM/TASI for adaptive differential PCM with time assignment speech interpolation. This system is designed to compress the output of two T1 24-channel PCM carrier terminals into a 1.544 Mbit/s signal that can be transmitted over a single T1 carrier line. The design is based on a bit slice microprocessor structur... 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