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Communications, IEEE Transactions on

Issue 1 • Date February 1972

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Displaying Results 1 - 22 of 22
  • [Front cover and table of contents]

    Publication Year: 1972 , Page(s): 0
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    Freely Available from IEEE
  • Editorial

    Publication Year: 1972 , Page(s): 1 - 2
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    Freely Available from IEEE
  • Correction to "Testing a Sample Population for the Rayleigh Distribution"

    Publication Year: 1972 , Page(s): 73
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (109 KB)  

    First Page of the Article
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  • Comments on "Codest: A New Pulse-Code Modulation System for Telegraph and Data Transmission"

    Publication Year: 1972 , Page(s): 74 - 76
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (334 KB)  

    It is shown that it is incorrect to state that the coding method "Codest" for either synchronous transmission or time multiplexing of asynchronous data is more efficient than the sliding index method. View full abstract»

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  • Comments on "Lower Bounds to Error Probability in the Presence of Large Intersymbol Interference"

    Publication Year: 1972 , Page(s): 77 - 78
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (186 KB)  

    First Page of the Article
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  • Comments on "Compatible High-Density Bipolar Codes: An Unrestricted Transmission Plan for PCM Carriers"

    Publication Year: 1972 , Page(s): 78 - 79
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (205 KB)  

    The basic code proposed in the referenced parep is identical with a three-zero substitution code proposed previously, and the remaining codes are variants obtained by adding one or more zeros in front of three-zero substitution kernels. The bipolar with six-zero substitution (B6ZS) code is superior in baseline wander performance to codes based on the three-zero substitution kernels, and other diff... View full abstract»

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  • [Back cover]

    Publication Year: 1972 , Page(s): 0
    Cited by:  Papers (1)
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    Freely Available from IEEE
  • A Polylithic Filter Channel Bank

    Publication Year: 1972 , Page(s): 48 - 52
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (464 KB)  

    The advent of AT-cut quartz crystal resonator filters has made possible the design of high-quality channel translation equipment with reduced cost and size. This paper describes a new channel bank, with built-in carrier generation, employing 8-MHz polylithic crystal filters for sideband selection and singleresonator filters for carrier selection. Integrated and hybrid thick film circuits have been... View full abstract»

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  • On the Role of Telecommunications in the Development of Nations

    Publication Year: 1972 , Page(s): 3 - 8
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (752 KB)  

    Both in developed and developing nations there is a clear need to discriminate among all the numerous choices of telecommunications technologies and services that have been, are, or can be developed. This discrimination should be based on a knowledge of the likely effects of each of those services on the community and its environment; discrimination can no longer be left open to the sole forces of... View full abstract»

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  • A New Modulation Concept in Channel Translating Equipment

    Publication Year: 1972 , Page(s): 67 - 72
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (496 KB)  

    Modern technology has made it possible to develop a new channel translating equipment capable of modulation directly into the 12-552-kHz frequency range. This range is chosen to include the basic 60-channel supergroup (312-552 kHz) together with supergroup 1 (60-300 kHz) and group A (12-60 kHz). The channel translating equipment is arranged to provide sideband orientation compatible with the North... View full abstract»

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  • High-Speed Facsimile Recording with Laser Light Sources

    Publication Year: 1972 , Page(s): 23 - 27
    Cited by:  Papers (1)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (464 KB)  

    This paper describes improvements in facsimile receivers for newspaper transmission made by replacing conventional crater tube light sources with He-Ne laser lights. This replacement allows the system to operate at wider frequency bandwidth and provides stronger writing light intensity and longer system durability. The light intensity of the writing source is modulated by a Teglass acoustooptic mo... View full abstract»

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  • A Mechanical Filter Channel Bank

    Publication Year: 1972 , Page(s): 64 - 67
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (480 KB)  

    The channel modem is encountered in carrier telephone systems in far greater quantities than any other equipment unit. Measures for improving the productivity with regard to this basic unit of equipment will thus be particularly effective. The newly developed channel modem uses mechanical filters for both the speech channel and the outband signaling. The channel filter has its passband at about 50... View full abstract»

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  • Lower Bounds on Error Probability in the Presence of Large Intersymbol Interference

    Publication Year: 1972 , Page(s): 76 - 77
    Cited by:  Papers (60)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (224 KB)  

    A lower bound on the symbol error probability achieved by any estimator of a digital pulse-amplitude-modulated sequence in the presence of white Gaussian noise and intersymbol interference is presented. The bound reduces to the well-known single-pulse error probability bound when intersymbol interference is small, but is tighter when interference is large. For example, on the singlepole ( View full abstract»

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  • Hybrid Carrier and Modulation Tracking Loops

    Publication Year: 1972 , Page(s): 53 - 55
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (352 KB)  

    The tracking loops presented herein exploit the coherency of the observed data sidebands at the carrier frequency for improvements in phase-coherent tracking, telemetry, and command system performance. The loop is motivated by one aspect of generalized harmonic analysis, viz., the so-called cross spectrum. The basic idea of the loop centers around using the power in the composite received signal (... View full abstract»

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  • Planning of a Digital Hierarchy

    Publication Year: 1972 , Page(s): 60 - 64
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (480 KB)  

    The choice of the fundamental parameters of a pulsecode modulation (PCM) system hierarchy depends on many factors, such as transmission media characteristics, time division switching and multiplexing plant requirements, traffic demand and network topology, etc. This paper deals with the problem of clarifying these interdependences and gives the general design criteria for planning a digital hierar... View full abstract»

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  • A Novel Digital Speech Detector for Improving Effective Satellite Capacity

    Publication Year: 1972 , Page(s): 55 - 60
    Cited by:  Papers (7)  |  Patents (4)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (768 KB)  

    A probabilistic analysis has been done by comparing cumulative distributions of voice and typical telephone-line noise, and the characteristics of voice waveform have been investigated in order to determine a new criterion for distinguishing the two signals. This digital speech detector is extremely sensitive to the onset of voice signal but much less sensitive to typical telephoneline noise. View full abstract»

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  • Variable-Rate Transmission for Rayleigh Fading Channels

    Publication Year: 1972 , Page(s): 15 - 22
    Cited by:  Papers (107)  |  Patents (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (832 KB)  

    A modulation system is proposed that continuously adjusts its data rate in response to signal strength variations in a fading channel. The optimum variation of data rate with channel conditions is determined, and includes the effects of feedback channel time delay, the interval between rate changes, and restriction of the number of allowable rates. Application of these results to a full duplex sit... View full abstract»

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  • An Electronic Tone Ringer for the Telephone

    Publication Year: 1972 , Page(s): 43 - 48
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (656 KB)  

    To meet with the increasing demand for a replacement of the electromechanical ringer in telephone sets, a tone ringer has been developed to fulfill the requirements of pleasantness and detectability in a noisy environment. Paired comparison tests and word profile tests have been carried out on a number of tones. To generate the most preferable tone appearing economically feasible, circuits have be... View full abstract»

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  • Some Simulation Results for the Time to Indicate Phase Lock

    Publication Year: 1972 , Page(s): 37 - 43
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (480 KB)  

    A digital simulation of a second-order phase-lock loop (PLL) acquiring lock in the presence of noise is reported. Since the system simulated includes lock-indicating circuitry, a distinction is made between the time to phase lock and the time to indicate lock. The parameter of interest is the time to indicate lock. The major results of the simulation are estimates of 1) the mean time to indicate l... View full abstract»

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  • Detection of Modulated Gaussian Signals in Noise

    Publication Year: 1972 , Page(s): 28 - 37
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (792 KB)  

    A method using Hermite polynomials is utilized for analyzing the outputs of νth-law devices for inputs of modulated Gaussian signals and zero-mean Gaussian noise. New results are developed for the output correlation functions, and techniques for obtaining closed-form expressions are pointed out. Output signal-to-noise ratios for various input carrier-to-noise-power ratios are calculated, and ... View full abstract»

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  • The Two-Stage RC Low-Pass Matched Filter

    Publication Year: 1972 , Page(s): 73 - 74
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (208 KB)  

    In a recent correspondence [1] practical constructions of matched filters for three-pulse signal waveshapes were shown. In each case, the matched filters were realized as a prefilter in cascade with a comb filter utilizing a delay line. The purpose of this correspondence is to present results that demonstrate how closely the simple two-stage RC low-pass filter... View full abstract»

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  • On the Optimization of Message-Switching Networks

    Publication Year: 1972 , Page(s): 8 - 14
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (616 KB)  

    Criteria recently developed by the authors for optimum capacity assignment in message-switching networks are applied to a network model which now contains nodal processors as well as interconnecting links. Linear and stepped cost functions are examined and various performance and cost-performance curves are presented. An efficient design procedure is described for the tedious case of stepped cost ... 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
Robert Schober
University of British Columbia