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IEEE Transactions on Communications

Issue 12 • December 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
  • Packet Switching in Radio Channels: Part I - Carrier Sense Multiple-Access Modes and Their Throughput-Delay Characteristics

    Publication Year: 1975, Page(s):1400 - 1416
    Cited by:  Papers (891)  |  Patents (54)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1587 KB)

    Radio communication is considered as a method for providing remote terminal access to computers. Digital byte streams from each terminal are partitioned into packets (blocks) and transmitted in a burst mode over a shared radio channel. When many terminals operate in this fashion, transmissions may conflict with and destroy each other. A means for controlling this is for the terminal to sense the p... View full abstract»

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  • Packet Switching in Radio Channels: Part II - The Hidden Terminal Problem in Carrier Sense Multiple-Access and the Busy-Tone Solution

    Publication Year: 1975, Page(s):1417 - 1433
    Cited by:  Papers (613)  |  Patents (33)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1493 KB)

    We consider a population of terminals communicating with a central station over a packet-switched multiple-access radio channel. The performance of carrier sense multiple access (CSMA) [1] used as a method for multiplexing these terminals is highly dependent on the ability of each terminal to sense the carrier of any other transmission on the channel. Many situations exist in which some terminals ... View full abstract»

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  • Voice-band data modem performance over companded delta modulation channels

    Publication Year: 1975, Page(s):1495 - 1502
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (735 KB)

    This paper reports upon the results of tests of the transmission of data over single- and multiple-hop companded delta modulation (DM) systems. The DM coder-decoder (CODEC) was optimized for voice transmission. Modem bit error rate (BER) achievable over the range of 1200-9600 bits/s is presented. A comparison with the performance of pulse code modulation (PCM) is included. The comparison indicates... View full abstract»

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  • [Back cover]

    Publication Year: 1975, Page(s): 0
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    Freely Available from IEEE
  • Congestion Control in Store and Forward Tandem Links

    Publication Year: 1975, Page(s):1434 - 1443
    Cited by:  Papers (35)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (936 KB)

    This paper discusses the problem of congestion in message-switched data communication networks. This condition occurs when more traffic enters a network than can reasonably be served. Two types of techniques employed to control congestion in already existing national networks are identified. A queueing model which can be used to analyze and compare these control schemes for a simple tandem link ne... View full abstract»

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  • Selecting Carrier Frequencies to Facilitate IM Product Measurement

    Publication Year: 1975, Page(s):1525 - 1526
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (144 KB)

    This correspondence presents a simple bandwidthefficient rule for assigning carrier frequencies that ensures that all fundamental product terms up to a desired order fall on distinct frequencies, thereby facilitating their measurement. View full abstract»

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  • Interframe Coding for 4-MHz Color Television Signals

    Publication Year: 1975, Page(s):1461 - 1466
    Cited by:  Papers (12)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (696 KB)

    An interframe coding system is described which is capable of transmitting a 4-MHz National Television System Commission (NTSC) color television signal. 6.3 Mbit/s transmission gives acceptable picture quality for video telephone or conference TV use. The NTSC color television signal is converted into a timedivision multiplex (TDM) signal which is composed of time-compressed chrominance and luminan... View full abstract»

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  • Optimum Design of a Feedback Controller for a Phase-Locked Loop

    Publication Year: 1975, Page(s):1521 - 1524
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    In communication engineering the problem of synchronization is important and is usually achieved by use of a phase-locked loop. If for any reason synchronization is lost, then it is not only necessary that it be restored but it be done so in the shortest possible time. This correspondence considers precisely this problem. It has been shown recently [2, pp. 253-259] that in case the loop filter View full abstract»

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  • Simultaneous Transmission of Digital Phase-Shift Keying and of Analog Television Signals

    Publication Year: 1975, Page(s):1509 - 1514
    Cited by:  Papers (4)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1032 KB)

    A method for transmission of a 1.544-Mbit/s data channel in a frequency band which is above the baseband of sound and vision signals of color television in FM microwave systems is described. The impact of the interfering video signal on phaseshift keyed (PSK) performance is evaluated. The probability of error as a function of the receiver carrier-to-noise ratio in the data channel for the case of ... View full abstract»

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  • Time Variations and Harmonic Content of Inductive Interference in Urban/Suburban and Residential/Rural Telephone Plants

    Publication Year: 1975, Page(s):1484 - 1495
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1296 KB)

    The time variations and harmonic content of longitudinal (common-mode) interference present on a wide variety of telephone lines in both urban/suburban and residential/rural environments have been measured. Significant levels of 60 Hz and its next 15 odd-harmonics were present. Variations with time ranged from an insignificant amount to over 20 dB. Interference trends relative to the size of the c... View full abstract»

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  • Facsimile Coding by Skipping White

    Publication Year: 1975, Page(s):1452 - 1460
    Cited by:  Papers (4)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    The white block skipping (WBS) method of coding binary facsimile images consists of breaking each scan line into N picture-element (pel) blocks, then using "0" as the code word for all-white blocks and "1" followed by the binary pattern in the block for non-all-white blocks. In the first part of this paper, we derive (based on a first-order Markov source model)... View full abstract»

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  • Optimum Demodulation in Pulse Communication Systems Employing Secondary Frequency Modulation

    Publication Year: 1975, Page(s):1503 - 1509
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    In this paper we examine the problem of optimum demodulation of a class of pulse modulation schemes that employ Secondary frequency modulation-frequently used in satellite data transmission and remote control systems. We develop approximate zero-lag and finite-lag receivers using approximate nonlinear filtering and smoothing techniques and study their steady-state behavior for various pulse modula... View full abstract»

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  • Optimum Receiver Filters in Digital Quadrature Phase-Shift-Keyed Systems with a Nonlinear Repeater

    Publication Year: 1975, Page(s):1389 - 1399
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (904 KB)

    The effects of filter shaping and nonlinearity in a coherent quadrature phase-shift-keyed (QPSK) system are investigated. Optimization of the receiver filter with respect to the meansquare error (MSE) is considered. Optimization is performed under two different constraints, corresponding to implementation of the filter at intermediate frequency and baseband, respectively. As an example a channel w... View full abstract»

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  • The Residual-Excited Linear Prediction Vocoder with Transmission Rate Below 9.6 kbits/s

    Publication Year: 1975, Page(s):1466 - 1474
    Cited by:  Papers (37)  |  Patents (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (968 KB)

    In this paper we present a new vocoder called the residual-excited linear prediction (RELP) vocoder. The concept of the RELP vocoder combines the advantages of linear predictive coding (LPC) and voice-excited vocoding. In the RELP system, vocal tract modeling is done by the LPC technique, and the LPC residual signal is used as the excitation signal. After low-pass filtering the residual signal is ... View full abstract»

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  • A Modified Receiver for Digital Optical Fiber Transmission Systems

    Publication Year: 1975, Page(s):1518 - 1521
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    A Percival coil connected between the photodetector and amplifier in the receiver of a digital optical communication system offers the possibility of a reduced signal power requirement for a given bit error rate. When the photodetector is an avalanche diode, the modified receiver requires a lower value of avalanche gain for optimum performance. View full abstract»

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  • A Modified Receiver for Optical Transmission Systems

    Publication Year: 1975, Page(s):1514 - 1518
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    A Percival coil connected between the photodetector and amplifier in the receiver of an optical communication system offers the possibility of improved signal-to-noise ratios (SNR's). When the photodetector is an avalanche diode, the modified receiver requires a lower value of avalanche gain for optimum performance. View full abstract»

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  • Rural Subscriber Physical Loops

    Publication Year: 1975, Page(s):1474 - 1483
    Cited by:  Patents (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1160 KB)

    This paper briefly traces the development of physical subscriber loop design in the Rural Electrification Administration (REA) Program from 1949 to the present. Development of equipment for overcoming in the most economical manner the signaling and transmission problems encountered with long subscriber loops is also discussed. This includes loading systems for wider bandwidth, better structural re... View full abstract»

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  • A Real-Time Adaptive Predictive Coder Using Small Computers

    Publication Year: 1975, Page(s):1443 - 1451
    Cited by:  Papers (8)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (896 KB)

    This paper describes a real-time computer implementaation of a fourth-order adaptive predictive coder (APC) which transmits speech at 6400 bits/s. To reduce the demands on the central processor, the terminal uses the average magnitude difference function (AMDF) for pitch extraction and calculates the predictor coefficients and reflection coefficients assuming stationarity of the input data. With 1... 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