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IEEE Transactions on Communications

Issue 8 • August 1979

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

    Publication Year: 1979, Page(s): 0
    Request permission for commercial reuse | PDF file iconPDF (173 KB)
    Freely Available from IEEE
  • Edge-Difference Coding - A New, Efficient Redundancy Reduction Technique for Facsimile Signals

    Publication Year: 1979, Page(s):1210 - 1217
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (850 KB)

    This paper describes an efficient redundancy reduction coding scheme for bi-level facsimile signals and field test results of a Group 3 facsimile machine applying this technique. The bi-level signal obtained by scanning documents is characterized by white-to-black or black-to-white edges. These edges cross successive scan lines smoothly in most cases. This scheme makes use of two-dimensional corre... View full abstract»

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  • Close Packing PCSFSK Signals - Model and Simulation Results

    Publication Year: 1979, Page(s):1234 - 1239
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (530 KB)

    In many signal processing satellite applications, it is necessary to pack as many bit-time unsynchronized, power imbalanced digital FDM users as possible into the available bandwidth. In certain important cases the on-board demodulator (which simultaneously detects each user bit-stream individually) is not able to maintain phase reference. Phase comparison sinusoidal frequency shift keying (PCSFSK... View full abstract»

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  • Realization of ADM Arithmetic Signal Processors

    Publication Year: 1979, Page(s):1247 - 1254
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (614 KB)

    The purpose of this paper is to show that signals which are adaptive delta modulation (ADM) encoded can be arithmetically processed directly, without first decoding or converting to pulse code modulation (PCM) format. By operating on the serial DM bit streams, the sum, difference and product can be obtained in PCM and ADM format. Employing a four-term, non-recursive, averaging filter after the pro... View full abstract»

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  • Comments on "Envelope Detector Performance for a Partially Coherent-Fading Sinewave in Noise"

    Publication Year: 1979, Page(s):1257 - 1258
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (212 KB)

    The basic premise in a recent paper that the matchedfilter square-law envelope detector is generally appropriate for fastfading as well as slow-fading incoherent channels is questioned. Its inappropriateness for a fast-fading incoherent Gaussian channel is demonstrated by evaluation of probability of error for this receiver and for the optimum receiver. As a result, modifications to some of the co... View full abstract»

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  • Author's reply

    Publication Year: 1979, Page(s):1258 - 1259
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (233 KB)

    First Page of the Article
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  • Comments on "Quantizing characteristics for signals having Laplacian amplitude probability density function"

    Publication Year: 1979, Page(s):1259 - 1260
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (173 KB)

    First Page of the Article
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  • [Back cover]

    Publication Year: 1979, Page(s): 0
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    Freely Available from IEEE
  • Consideration on Call Processing Function Distribution to Subscriber Terminal

    Publication Year: 1979, Page(s):1160 - 1168
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (800 KB)

    This paper proposes a new sharing of call processing functions between a terminal and a switching system, taking recent technology advances into consideration. Information and its processing in an electronic switching system are defined and their calculation method is shown to discuss the function share. Numerical examples of information and its processing amount are obtained using NTT's commercia... View full abstract»

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  • A Queueing Network Analysis of Computer Communication Networks with Window Flow Control

    Publication Year: 1979, Page(s):1199 - 1209
    Cited by:  Papers (162)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1000 KB)

    A computer communication network with window flow control is modeled by a closed multichain queueing network. The severe computational limitation of previous solution algorithms is overcome with a heuristic derived from the recently found mean value analysis. A large numerical example is given. View full abstract»

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  • On the One-Moment Analysis of Telephone Traffic Networks

    Publication Year: 1979, Page(s):1169 - 1174
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    In this paper is a formulation of the one-moment method of analysis for a telephone traffic network in terms of the link offered traffics. By using a slightly strengthened version of the assumptions hitherto used in one-moment analysis, and by developing a type of limited availability link model, it is shown how the offered traffic to each link may be found, and thus how the network analysis may b... View full abstract»

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  • Comparative Performance of SVD and Adaptive Cosine Transform in Coding Images

    Publication Year: 1979, Page(s):1230 - 1234
    Cited by:  Papers (16)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    An adaptive coding for singular value decomposition (SVD) samples is described in order to reduce the amount of transmitted data for monochrome images. This method is compared to the discrete cosine transform in terms of mean square error. Low bit rates, as 0.8 bits/pixel, are attempted with a good visual quality and low RMS error (0.087%). The visual and mathematical results of the transmission e... View full abstract»

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  • Some Effects on Channel Occupancy of Limiting the Number of Available Servers in Small Cell Mobile Radio Systems Using Dynamic Channel Assignment

    Publication Year: 1979, Page(s):1224 - 1226
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    The performance of large scale multicell mobile radio systems using dynamic channel assignment and having limitations on the number of servers available in each coverage cell was investigated by computer simulation. At low system blocking the traffic carried is determined solely by the server limitations while at higher blocking the traffic carried is determined by channel limitations. View full abstract»

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  • Statistical Study of Edges in TV Pictures

    Publication Year: 1979, Page(s):1239 - 1247
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (920 KB)

    The present study is devoted to the statistical analysis of edges in still monochrome TV pictures. The visual information carried by the edges is especially important both for image interpretation and for subjective image quality evaluation. Statistical knowledge on edges is helpful to improve image coding techniques significantly as well as processing techniques for scene analysis. After an intro... View full abstract»

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  • BRAM: The Broadcast Recognizing Access Method

    Publication Year: 1979, Page(s):1183 - 1190
    Cited by:  Papers (83)  |  Patents (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (816 KB)

    In this paper, we first present the broadcast recognizing access method (BRAM), an access protocol suitable for regulating internode communication in either a radio or (coaxial or fiber) cable based communication system. The method avoids collisions, imposes negligible computational requirements on the nodes attempting to transmit, and is fair in the sense that no node will be indefinitely prevent... View full abstract»

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  • Refractive Multipath Model for Line-of-Sight Microwave Relay Links

    Publication Year: 1979, Page(s):1174 - 1182
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    A major source of propagation outages on microwave line-of-sight (LOS) links is multipath fading caused by steep negative refractive index gradients. This paper develops a complete transfer function characterization of refractive multipath on LOS links. The results clearly show the dependence of discrete path amplitudes and delays on receiver height, transmitter height, refractive index gradient, ... View full abstract»

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  • A Diffusion Approximation Model for a Communication System Allowing Message Interference

    Publication Year: 1979, Page(s):1190 - 1199
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (832 KB)

    Probabilistic models are presented and investigated to describe the service furnished to messages sent via communications channels on which messages in progress may be "destroyed" by a new message demand. Retries by destroyed messages are modeled. The general approach utilizes diffusion approximations. The quality of the numerical results is evaluated by comparison with simulations, and is found t... View full abstract»

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  • An Improved Adaptive Electronic Circulator for Telephone Applications

    Publication Year: 1979, Page(s):1218 - 1224
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    A previous attempt at realizing an adaptive circulator for telephone applications suffered from limitations due to voice switching problems, resistive part matching only, and some difficulties with adaptive operation for broadband signals. The use of pilot tones enables the circuit to be free from voice switching problems and to accomplish a close impedance match with that of a telephone line. Ana... View full abstract»

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  • Analysis of Intermodulation Relationships Within a Limited Band of Frequencies

    Publication Year: 1979, Page(s):1226 - 1230
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    A simple formula is derived for identifying intermodulation (IM) mixes that are capable of generating IM products that fall within the same frequency band as the intermodulating signals. The formula is valid for any frequency band, any IM order, and any number of signals. Examples of its use are given. View full abstract»

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  • Comparative Discussion of Circuit- vs. Packet-Switched Voice

    Publication Year: 1979, Page(s):1153 - 1160
    Cited by:  Papers (32)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (744 KB)

    Various other studies have already indicated potential advantage of packet-switching over tradiational circuit-switching concepts for voice communications. This paper explores the robustness of such comparisons for a range of network architectures. In particular, it is demonstrated that network sizing as related to the number of voice channels traversing a particular transmission link, and network... View full abstract»

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  • A Novel Theorem with Potential Application to Automatic Equalization

    Publication Year: 1979, Page(s):1254 - 1257
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    When the signs of the alternate terms of a symmetric discrete time series are reversed and the resultant series is convolved with the original, the newly created time series will have alternate values equal to zero. This theory is shown here to have a potential application in the design of a single-shot zero-forcing equalizer (of the adjust and freeze type). The system can be easily generalized to... 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