IEEE Transactions on Communications

Issue 4 • April 1977

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Displaying Results 1 - 15 of 15
  • [Front cover and table of contents]

    Publication Year: 1977, Page(s): 0
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    Freely Available from IEEE
  • Adaptive Trellis Encoding of Discrete-Time Sources with a Distortion Measure

    Publication Year: 1977, Page(s):408 - 417
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (965 KB)

    An adaptive trellis-encoding scheme, using the Viterbi algorithm for trellis search and the Kalman algorithm for adaptive adjustment, is described. The encoder is comprised of a fixed precoder and a time-varying trellis coder in tandem. The source decoder is timevarying with the time-varying part being represented by a feed forward finite-state machine (FSM). Adaptive trellis encoding requires the... View full abstract»

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  • A General Spectral Analysis of Time Jitter Produced in a Regenerative Repeater

    Publication Year: 1977, Page(s):417 - 426
    Cited by:  Papers (11)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (842 KB)

    A general theory is presented for evaluating the spectral density of time jitter produced in a self-timed regenerative repeater. The timing circuit consists of a general memoryless nonlinear device followed by a narrow-band tank circuit tuned as close as possible to the symbol rate; the signal (timing wave) at the output of the circuit has both amplitude and phase modulations that cause the timing... View full abstract»

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  • [Back cover]

    Publication Year: 1977, Page(s): 0
    Cited by:  Papers (5)
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    Freely Available from IEEE
  • Tracking Performance of Symbol Synchronizers for Manchester Coded Data

    Publication Year: 1977, Page(s):393 - 408
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (992 KB)

    The implementation and tracking performance of symbol synchronizers for Manchester coded data is presented with motivation provided by maximum a posteriori (MAP) estimation theory. In particular, it is shown herein that for uncoded data symbols, with, however, arbitrary data transition probabilities, certain physically realizable closed-loop structures, which are readily implemented in practice, a... View full abstract»

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  • Performance of a 400 Mbit/s System over a Line-of-Sight Path

    Publication Year: 1977, Page(s):427 - 432
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (664 KB)

    During November 1971, a 400 Mbit/s quadriphase-shift-keyed system was operated at 13.3 and 14.9 GHz over a 22.8-km line-of-sight path. This path was chosen because of its high incidence of meteorological conditions favorable to anomalous propagation. Performance of the system during fading periods is reported here. Additional information from extensive meteorological measurements near midpath is p... View full abstract»

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  • Simplified MSK Signaling Technique

    Publication Year: 1977, Page(s):433 - 441
    Cited by:  Papers (81)  |  Patents (25)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (808 KB)

    Modulation and demodulation in the minimum (frequency)-shift keying (MSK) format are reduced to the form of coherent biphase keying. Considerable simplification of circuitry is thus effected without sacrifice of performance. When the ratio of the carrier frequency to the bit rate is high, then the technique described here does not require the precise relative phasing of any pair of oscillators in ... View full abstract»

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  • A New System Synchronization Technique for the Switching Satellite

    Publication Year: 1977, Page(s):455 - 458
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (400 KB)

    A new technique for achieving system synchronization to the switching satellite is described; this technique requires only three earth stations, designated as control stations, to transmit synchronization signals. The three signals are used to measure the three space delays from the control stations to the satellite. The control stations broadcast the space delays to all other stations in the syst... View full abstract»

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  • Interframe Redundancy Reduction of Video Signals Generated by Translating Objects

    Publication Year: 1977, Page(s):448 - 455
    Cited by:  Papers (31)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (904 KB)

    In interframe coding the content of the frame memory can also be utilized for the prediction of the luminances of moving area picture elements (pels), provided that their displacement has been measured and transmitted. After an analysis of methods for the optimal segmentation of the image into areas corresponding to background, translating objects, and areas not predictable from the previous frame... View full abstract»

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  • Linear Minimum Mean-Square Error Estimators Applied to Channel Equalization

    Publication Year: 1977, Page(s):441 - 446
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (488 KB)

    This concise paper investigates various aspects of the application of unbiased linear minimum mean-square error (ULMMSE) estimators to the equalization of channels used for digital data transmission. One application is to the equalization of the channel to a response free from intersymbol interference. Previous results regarding this application are clarified and extended. The other application is... View full abstract»

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  • Impulse Response of a Meteor Burst Communications Channel Determined by Ray-Tracing Techniques

    Publication Year: 1977, Page(s):467 - 470
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (424 KB)

    Ray-tracing techniques are used to derive the impulse response at VHF of a meteor burst communications channel. An approach to analyze the effects of multipath arising from wind shear is also presented and is applied to a simplified model of trail distortion. Within the limitations of the models adopted, we have found that a single path with a spread of approximately 0.2 μs adequately describ... View full abstract»

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  • Considerations on Error Probability in Correlated-Symbol Systems

    Publication Year: 1977, Page(s):462 - 467
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (584 KB)

    An approach to evaluate the error probability in conventional PAM digital data transmission systems with correlated symbols in the presence of intersymbol interference and additive noise is formulated in general and it is applied to the Gram-Charlier series expansion method. It is shown that the technique of conditioning few symbols before and/or after the symbol to be detected increases substanti... View full abstract»

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  • Simple Derivation of Queueing Formulas for Loop Systems

    Publication Year: 1977, Page(s):446 - 448
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (344 KB)

    Some queueing theory formulas for loop systems with random slot seizure previously obtained by the author via a lengthy series of derivations are shown to follow immediately from priority queueing formulas derived by Takács if an appropriate artifice is used to make Takács' results applicable. View full abstract»

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  • Time Division Circular Polarization: A Simple Technique for Increasing Propagation Experiment Productivity

    Publication Year: 1977, Page(s):470 - 472
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (248 KB)

    A simple technique, time division circular polarization (TDCP), is described which permits the simultaneous measurement of attenuation and depolarization for two orthogonal linearly polarized waves and two orthogonal circularly polarized waves in a slowly varying linear propagation medium using only a single frequency beacon switched between two linearly polarized antenna ports. View full abstract»

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  • Comparison of Network Search Schemes

    Publication Year: 1977, Page(s):459 - 462
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (424 KB)

    Three network search schemes-pure flood search, twoarea search, and link-by-link search-are presented and analyzed. The average search duration and the average search traffic are the performance criteria. The flood search scheme is found to be clearly inferior. Two methods for comparing the remaining two schemes are then proposed and applied. It is found that while one method might favor the two-a... 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