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IEEE Transactions on Communication Technology

Issue 1 • February 1970

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Displaying Results 1 - 17 of 17
  • [Front cover and table of contents]

    Publication Year: 1970, Page(s): 0
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    Freely Available from IEEE
  • Digitally Linearizable Compandors with Comments on "Project for a Digital Telephone Network"

    Publication Year: 1970, Page(s):1 - 4
    Cited by:  Papers (3)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (431 KB)

    A general model for digitally linearizable companding laws for use in digital communication systems is presented. The model is utilized to compare a ternary code presented by Neu and Kündig with a binary code. The primary considerations are ratio of signal to quantization noise, companding improvement, and linearization. View full abstract»

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  • A Simple Adaptive Equalizer for Efficient Data Transmission

    Publication Year: 1970, Page(s):5 - 12
    Cited by:  Papers (52)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1103 KB)

    A small and relatively inexpensive automatic equalizer has been developed for use with a vestigial sideband AM data set presently utilized to provide a high-speed Bell System voiceband data service. The equalizer uses a transversal filter structure comprising a tapped analog delay line with a variable-gain circuit associated with each tap. Its operation is adaptive in the sense that the tap-gain-a... View full abstract»

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  • Traffic Capacity of Three Types of Common-User Mobile Radio Communication Systems

    Publication Year: 1970, Page(s):12 - 21
    Cited by:  Papers (39)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1005 KB)

    The traffic-carrying capability of three types of common-user mobile radio systems are derived and compared; they are also compared with a private-user system. The systems considered make use of multichannel capability for mobile units or a dispersed array of base stations, or both. View full abstract»

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  • Reduction of Delay Distortion in a Horn-Reflector Antenna System Employing Overmoded-Waveguide Feeder

    Publication Year: 1970, Page(s):21 - 26
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (687 KB)

    There is increasing interest in multiband antenna installations where the same antenna and feeder are used for radio-relay systems simultaneously operating in the 4-, 6-, and ll-GHz common-carrier bands. At 11 GHz the circular waveguide feeder can support many unwanted modes. Delay distortion is caused in part by higher order mode conversion-reconversion in such an oversized-waveguide feeder. An i... View full abstract»

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  • Idealized Pencil-Beam Antenna Patterns for Use in Interference Studies

    Publication Year: 1970, Page(s):27 - 32
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (795 KB)

    Idealized antenna patterns to represent pencil-beam antennas are derived from antenna maximum gains and operating wavelengths. The patterns include analytic expressions describing the principal polarization gain functions for the main beam and and first sidelobe. Higher order sidelobes are expressed in terms of smoothed mean power levels of these sidelobes. View full abstract»

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  • Measurements of Waveguide Component and Joint Mixing Products in 6-GHz Frequency Diversity Systems

    Publication Year: 1970, Page(s):33 - 37
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (546 KB)

    A measuring procedure and circuit are described for power-level determination of odd order "mixing products" generated in waveguide components of 6-GHz FM diversity communication systems. Measured results at several carrier frequencies and diversity separations are presented for typical components used (joints, flexible sections, and ferrite components). View full abstract»

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  • Nonlinear Phase Shift in Traveling-Wave Tubes as Applied to Multiple Access Communications Satellites

    Publication Year: 1970, Page(s):37 - 48
    Cited by:  Papers (47)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1709 KB)

    A modern communications satellite typically amplifies many frequency-modulated radio-frequency carriers in a single common amplifier. The nonlinear phase versus input power behavior of traveling-wave tubes (TWT) and its impact on intermodulation noise and intelligible crosstalk is treated. A theoretical model is presented, which allows calculation of the multicarrier performance of the TWT, and an... View full abstract»

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  • On Discrete Sequential Estimation of Bit Synchronization

    Publication Year: 1970, Page(s):48 - 58
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1167 KB)

    In digital communications, the theory of optimum data detection requires precise knowledge of the bit transition time at the receiver before bit-by-bit detection can be implemented. This paper presents a method for the optimum design of discrete sequential algorithms for bit synchronization which may readily be implemented with digital hardware or with a digital computer. The method is based on Ba... View full abstract»

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  • Baseband AGC in an AM-FM Telemetry System

    Publication Year: 1970, Page(s):59 - 63
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (502 KB)

    The use of AGC loops at the input and output of the FM link in an AM-FM telemetry system allows the mean-square transmitter deviation to be maintained near maximum value, even though data may be nonstationary. However, errors result because of the inability of the receiver AGC loop to track perfectly gain variations in the transmitter loop. In this paper the general characteristics of AGC are disc... View full abstract»

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  • Lightning Shielding of Plastic Telephone Cable

    Publication Year: 1970, Page(s):64 - 67
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (433 KB)

    Data are presented on the surge characteristics of various types and combinations of metals when applied as a shield for buried telephone cables. Surge currents were applied to the shield of 500-foot lengths of cable and the potentials developed between the shield and conductors were measured at selected points along the cable length in order to determine relative susceptibility to lightning influ... View full abstract»

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  • The PAR Meter: Applications in Telecommunications Systems

    Publication Year: 1970, Page(s):68 - 73
    Cited by:  Papers (4)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (586 KB)

    A time-domain measuring technique utilizing the peak-to-average ratio (PAR) of a received pulse, in conjunction with a few other simple transmission measurements, serves to provide a fast quality check on channels for data communications. Facility makeup of the circuit must be known, since the PAR meter is designed to be especially responsive to envelope delay distortion. This raises potential con... View full abstract»

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  • The Effect of Phase Jitter on the Performance of a First-Order Phase-Locked Loop

    Publication Year: 1970, Page(s):74 - 76
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (351 KB)

    A filterless phase-locked loop is considered with an arbitrary periodic phase comparator. The loop has a jittered input and is perturbed by thermal noise. Under such conditions the loop skips cycles from time to time. A study is made of the statistical behavior of the loop and emphasis is placed on the determination of the average time of skipping cycles. This problem is related to the first passa... View full abstract»

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  • Medium Disturbance Sensing Techniques for FSK Modulation

    Publication Year: 1970, Page(s):76 - 80
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    This paper describes measurement techniques for rapidly characterizing frequency selective fading channels. The approach used involves estimating each of the parameters describing the transmitted signal and channel disturbances. This includes signal level, noise level, and multipath spread. While specifically applied to FSK modulation and HF channels, the techniques are applicable to other fading ... View full abstract»

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  • Optimal Communication Systems with Noiseless Feedback for a Binary Source and Band-Limited White Gaussian Channel

    Publication Year: 1970, Page(s):80 - 83
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (375 KB)

    A communication system with noiseless feedback, noisy forward band-limited channel, and binary source is investigated. Each binary symbol m±is represented by a sequence of signalsspm(y_{k})varpi(t-k_{tau}), the amplitude of which is a function of the a posteriori likelihood ratio Yk. In a sequential receiver a decision is made whenever the likelihood ratio rea... View full abstract»

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  • Higher Order Modes in Large-Aperture Receiving Antennas

    Publication Year: 1970, Page(s):83 - 84
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (130 KB)

    Problems with delay distortion in a microwave relay system can result from higher order modes propagating in the waveguide feeder. Higher order modes are excited by various means in the antenna aperture. Certain higher order modes must exist in an antenna aperture to satisfy the boundary conditions of the aperture and are therefore excited by plane waves arriving on axis. These modes having on-axi... View full abstract»

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  • [Back cover]

    Publication Year: 1970, Page(s): 0
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    Freely Available from IEEE

Aims & Scope

This Transactions ceased publication in 1971. The current retitled publication is  IEEE Transactions on Communications.

Full Aims & Scope