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IEEE Transactions on Communications

Issue 4 • April 1975

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Displaying Results 1 - 19 of 19
  • [Front cover and table of contents]

    Publication Year: 1975, Page(s): 0
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    Freely Available from IEEE
  • Efficiency and Matching Tradeoffs for Inductively Loaded Short Antennas

    Publication Year: 1975, Page(s):430 - 435
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (534 KB)

    Efficiency and input resistance of short monopoles (or dipoles) may be significantly improved through use of a loading coil in series with the monopole wire. The piecewise sinusoidal moment method is used to analyze the loaded monopole. When loaded to resonance, the current rises from the feed value to a peak slightly beyond the load point with decay to zero at the end. Radiation resistance improv... View full abstract»

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  • Improving Automatic Repeat-Request (ARQ) Performance on Satellite Channels Under High Error Rate Conditions

    Publication Year: 1975, Page(s):436 - 439
    Cited by:  Papers (68)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (465 KB)

    Large round trip delay associated with satellite channels reduces the throughput for automatic repeat-request (ARQ) system of error control rather drastically under high error rate conditians. Ground segments that usually accompany satellite circuits at both ends introduce bursts of errors, during which block error rates tend to be quite high, bringing down the throughput to very low values. In th... View full abstract»

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  • Correction to "Bounds on Error in Signal Parameter Estimation"

    Publication Year: 1975, Page(s): 486
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (75 KB)

    First Page of the Article
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  • [Back cover]

    Publication Year: 1975, Page(s): 0
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    Freely Available from IEEE
  • Multilevel Block Codes with DC-Constraint Property

    Publication Year: 1975, Page(s):448 - 452
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    Multilevel fixed-length block codes which have a dcconstraint property are discussed, and the upper bounds of the transmission rates of such codes are described under the limitations of the running digital sums (RDS) of coded signal streams. Then stateindependent decodable codes whose transmission rates are equal to the upper bounds are presented for small values of word length. In these codes, fo... View full abstract»

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  • Bistable Behavior of ALOHA-Type Systems

    Publication Year: 1975, Page(s):401 - 410
    Cited by:  Papers (135)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1160 KB)

    Packet switching has found widespread application in computer communications because of its ability to efficiently handle high ratios of peak-to-average data rate. Packet radio is the application of packet switching techniques to radio channels. The resultant multiple-access problem requires novel approaches. Such approaches have been developed by others and have primarily been analyzed in steady-... View full abstract»

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  • Computer Modeling of the Statistical Properties of Transionospheric Scintillation Channels

    Publication Year: 1975, Page(s):462 - 467
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    This concise paper shows that a band-limited bivariatenormal time series is a useful model for the envelope of scintillating radio signals traversing the ionosphere. A software model is presented whose generated time series is compared to an actual block of scintillation data. A comparison of computer-generated and actual scintillation data shows that the fade-duration distribution of the simulate... View full abstract»

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  • Quantizer Mismatch

    Publication Year: 1975, Page(s):439 - 443
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    A simple upper bound is derived to the difference in performance obtained from applying a given quanfizer to two different sources. This provides a bound on the performance loss or mismatch resulting when applying a quantizer designed for one source to another. The bound is in terms of a generalization of the Vasershtein distance between the source random variables and does not depend on the parti... View full abstract»

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  • Wide-Band Frequency-Shift Keyed Receiver Performance in the Presence of Intersymbol Interference

    Publication Year: 1975, Page(s):453 - 458
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (632 KB)

    The noncoherent binary frequency-shift keyed (FSK) receiver analyzed in this concise paper employs predetection filters with bandwidths much larger than the symbol rate. Wide-band predetection filtering is used in order to trade performance for simplicity and reduced costs. In this analysis bit-error rate (BER) degradation due to wide predetection filter bandwidths and intersymbol interference cau... View full abstract»

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  • Packet Switching in a Multiaccess Broadcast Channel: Performance Evaluation

    Publication Year: 1975, Page(s):410 - 423
    Cited by:  Papers (283)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1456 KB)

    In this paper, the rationale and some advantages for multiaccess broadcast packet communication using satellite and ground radio channels are discussed. A mathematical model is formulated for a "slotted ALOHA" random access system. Using this model, a theory is put forth which gives a coherent qualitative interpretation of the system stability behavior which leads to the definition of a stability ... View full abstract»

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  • An Automatic Protection System for Digital Lines

    Publication Year: 1975, Page(s):478 - 482
    Cited by:  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    An automatic transfer system provides a means of switching both ends of a working digital carrier span line automatically to a protection line when a failure occurs on a working line, without service interruption. Priority schemes enable one or two protection lines to serve any number of working lines. New design concepts expand the flexibility of automatic line transfer. Each digital span line ma... View full abstract»

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  • Quantization Error in Predictive Coders

    Publication Year: 1975, Page(s):423 - 429
    Cited by:  Papers (34)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    Predictive coders have been suggested for use as analog data compression devices. Exact expressions for reconstructed signal error have been rare in the literature. In fact most results reported in the literature are based on the assumption of Gaussian statistics for prediction error. Predictive coding of first-order Gaussian Markov sequences are considered in this paper. A numerical iteration tec... View full abstract»

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  • Probability of Error in Pseudonoise (PN)-Modulated Spread Spectrum Binary Communication Systems

    Publication Year: 1975, Page(s):467 - 472
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    The probability of error in a binary communication system using pseudonoise (PN) modulation to spread the transmitted spectrum is influenced by noise, bandlimiting, and synchronization errors. In this paper the average probability of error is determined, using a series expansion of the characteristic function of the intersymbol interference. It is shown that the effects of intersymbol interference... View full abstract»

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  • Error Correction in a Radio-Based Data Communications System

    Publication Year: 1975, Page(s):458 - 462
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (576 KB)

    This paper describes an interesting application of error correcting codes to improve the reliability of data transmission of a radio-based communication system. It shows how a low-cost system can be designed and constructed to bring significant improvements to the system's performance when a proper approach is taken to both select and implement the coding scheme. View full abstract»

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  • Binary Transversal Filters for PAM Pulse Generation with Correlative Coding

    Publication Year: 1975, Page(s):483 - 486
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    High-speed pulse amplitude modulation (PAM) data transmission systems require carefully shaped pulses having small bandwidth, and various coding schemes are used to increase transmission efficiency via spectrum shaping. Traditional hardware for the generation of such pulses, whether coded or not, is both difficult to design and expensive to implement. The binary transversal filter (BTF) has recent... View full abstract»

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  • Dynamic Response and Stability of Mutually Synchronized Systems

    Publication Year: 1975, Page(s):443 - 448
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (576 KB)

    One of the synchronized systems of large digital transmission networks is the mutually synchronized system called the equational timing system. This system is, however, complicated, and its dynamic responses are not obtained analytically for general configuration. This paper describes dynamic responses and stability conditions of mutually synchronized systems applying the equational timing system ... View full abstract»

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  • Intersymbol Interference with Orthogonal Signaling

    Publication Year: 1975, Page(s):472 - 474
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    The occurrence of both inter- and intrasymbol interference in a communications system utilizing orthogonal signals and memoryless correlation detection is described, and a system model is presented. A relationship between a bound on peak interference and time-bandwidth product for several well known orthogonal signal sets is reported. View full abstract»

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  • Measuring the Speed of Moving Objects from Television Signals

    Publication Year: 1975, Page(s):474 - 478
    Cited by:  Papers (31)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (776 KB)

    Very simple techniques for estimating the speed of a moving object from a television signal are described. They assume that frame storage is available. One technique requires little more than two threshold circuits and two counters. The accuracy of one technique is better than ± 10 percent, quite sufficient to enable the measure to be used as a control signal for the efficient coding of telev... 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