IEEE Transactions on Communications

Issue 10 • October 1986

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Displaying Results 1 - 16 of 16
  • [Front cover and table of contents]

    Publication Year: 1986, Page(s): 0
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    Freely Available from IEEE
  • Blocking Probability in Two-Way Distributed Circuit-Switched CATV

    Publication Year: 1986, Page(s):977 - 984
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (715 KB)

    The service quality of a circuit-switched network is usually measured in terms of probability of rejecting a call and the delay encountered by the customers in accessing the common resources. In this paper, a simplen-dimensional birth-death steady-state traffic model is used to evaluate the blocking probability experienced byndifferent classes of customers in a two-way intera... View full abstract»

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  • Rate 5/6 Trellis-Coded 8-PSK

    Publication Year: 1986, Page(s):1045 - 1049
    Cited by:  Papers (30)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (475 KB)

    Some new short constraint length codes are described for satellite channels which are constant-envelope and which have spectral and energy efficiencies intermediate to other recent coded techniques, namelyr = 2/3coded 8-PSK andr = 3/4coded 16-PSK. We use two intervals of 8-PSK transmission to form a modulation base forr = 5/6trellis codes. A particularly attractive... View full abstract»

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  • [Back cover]

    Publication Year: 1986, Page(s): 0
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    Freely Available from IEEE
  • Utilization of Atmospheric Transmission Losses for Interference-Resistant Communications

    Publication Year: 1986, Page(s):1009 - 1015
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (688 KB)

    Atmospheric absorption and scattering losses offer a means of protection against cochannel interference in RF communications links that operate above 18 GHz. By varying the operating frequency of such a link, the communicator can adjust the atmospheric attenuation of the signal and interference in order to improve link performance. If the effective length of the interference path exceeds that of t... View full abstract»

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  • An Improved Hybrid Companding Delta Modulator

    Publication Year: 1986, Page(s):995 - 998
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (472 KB)

    We present two new forms of "hybrid companding" delta modulation for speech encoding. These algorithms differ from the earlier hybrid companding delta modulation (HCDM) scheme in that they employ Song voice adaptation as the basis of the instantaneous companding, rather than constant factor adaptation. We show that although the two new algorithms produce SQNR curves which are similar to that of HC... View full abstract»

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  • Performance of Standard Code-Tracking Loops in the Presence of Dual Tone Interference

    Publication Year: 1986, Page(s):999 - 1008
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (808 KB)

    The performance of sum/difference and reference/difference code tracking loops in direct-sequence spread-spectrum communication systems are fully analyzed and compared for nonwhite interference situations. In particular, symmetric dual-tone interference is considered and the worst case tone spacing and relative tone energies are determined. Parameterized curves of tracking-error variance and mean-... View full abstract»

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  • Performance of PLL Synchronized Optical PPM Communication Systems

    Publication Year: 1986, Page(s):988 - 994
    Cited by:  Papers (30)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (648 KB)

    Receiver timing synchronization of an optical PPM communication system can be achieved using a phase-locked loop (PLL) if the photodetector output is properly processed. The synchronization performance is shown to improve with increasing signal power and decreasing loop bandwidth. The bit error rate performance of the PLL synchronized PPM system is analyzed and compared to that of the perfectly sy... View full abstract»

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  • Semicompatible High Definition Television Using Field Differential Signals

    Publication Year: 1986, Page(s):1031 - 1037
    Cited by:  Papers (3)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (672 KB)

    In a previous paper we proposed transmitting high definition television (HDTV) by means of semicompatible HDTV (SC-HDTV) signals which utilized differences between scan lines. The line-differential SC-HDTV waveform had the virtue of being easily convertible to an NTSC compatible color picture. The line-differential SC-HDTV signal required three present-day CATV channels for local distribution. Wit... View full abstract»

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  • On the Decomposition of Large Communication Networks for Hierarchical Control Implementation

    Publication Year: 1986, Page(s):985 - 987
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (352 KB)

    In the implementation of hierarchical schemes for the adaptive control of large communication networks, decomposition of the overall network into node clusters and assignment of a supervisor for each cluster are of central importance. A formulation of the decomposition problem as a mathematical optimization problem is given and an algorithm for solution is presented. View full abstract»

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  • On Nonblocking Multiconnection Networks

    Publication Year: 1986, Page(s):1038 - 1041
    Cited by:  Papers (54)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (376 KB)

    In the paper, four theorems describing conditions under which a three-stage multiconnection network is nonblocking for different routing strategies are formulated and proved. These theorems hold for any values of the structural parameters of a network. For some networks having a small number of outer stage switches, these theorems give significantly lower numbers of required middle stage switches ... View full abstract»

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  • Broad Signal Constraints for the Management of the Spectrum in Telephone Loop Cables: Identical Constraint on All Pairs

    Publication Year: 1986, Page(s):1041 - 1043
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (272 KB)

    A previous paper showed that constraining the total energy transmitted on all pairs in a cable during any time interval of a specified duration limits the maximum instantaneous near-end crosstalk voltage on any pair. This paper determines a constraint on the energy that is the same for each pair and that guarantees the same limit on near-end crosstalk. While the new constraint permits less variati... View full abstract»

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  • A Class of Optimum Block Codes in Signal Space

    Publication Year: 1986, Page(s):1043 - 1045
    Cited by:  Papers (132)  |  Patents (9)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (312 KB)

    By using convolutional coding coupled with expanded sets of channel signals, Ungerboeck showed that it is possible to obtain coding gains of several decibels at a given data rate without increasing the transmission bandwidth. In this paper, we construct a class of optimum signal space codes using short binary block (as opposed to convolutional) codes. Our results are compared to those obtained by ... View full abstract»

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  • TWT Equal Carrier Intermodulation Calculations

    Publication Year: 1986, Page(s):1024 - 1030
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (616 KB)

    When more than one FM carrier is put through a TWT (or SSPA), the output consists of the original carriers plus intermod lines. The procedure for calculating these lines has been studied by several authors in recent years because of the rapid growth of satellite communications in which TWT's (and SSPA's) play a major role. Basically, these intermod calculations are used to design multiple carrier ... View full abstract»

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  • Cochannel Interference Cancelling Effects of MSE Processing and Viterbi Decoding in On-Board Processing Satellites

    Publication Year: 1986, Page(s):1049 - 1053
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (416 KB)

    This paper presents cochannel interference cancelling techniques in on-board processing satellite systems using orthogonal polarizations. The techniques, based on mean square error (MSE) criterion and convolutional coding/soft decision Viterbi decoding (SDVD), are introduced on board. The bit error rate (BER) is derived for the mixed detection of a desired signal and an undesired cochannel interfe... View full abstract»

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  • Performance of Multibeam Packet Satellite Systems with Conflict Free Scheduling

    Publication Year: 1986, Page(s):1016 - 1023
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (688 KB)

    The concept of a multibeam satellite system With on-board processing and memory is studied. In this system multiple slotted ALOHA uplinks carry the traffic to the satellite. Packets are accepted at the satellite, when memory is available, and are routed to their destination zones using a TDM protocol. We present a model which can be used to evaluate a satellite system with conflict-free scheduling... 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