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IEEE Transactions on Communications

Issue 2 • Date February 1975

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Displaying Results 1 - 23 of 23
  • [Front cover and table of contents]

    Publication Year: 1975, Page(s): 0
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    Freely Available from IEEE
  • Editorial

    Publication Year: 1975, Page(s): 185
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    Freely Available from IEEE
  • [Back cover]

    Publication Year: 1975, Page(s): 0
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    Freely Available from IEEE
  • The Design of Nonlinear Phase-Tracking Loops by Simulation

    Publication Year: 1975, Page(s):296 - 299
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    The design of carrier phase and timing recovery methods for data transmission by means of simulation is described. Results are given for a partial response class 4 data signal transmitted by single-sideband amplitude modulation. View full abstract»

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  • A Digital Hybrid Transmission System for 280 Mbits/s and 560 Mbits/s

    Publication Year: 1975, Page(s):274 - 282
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1328 KB)

    This paper presents the development of repeaters and line equipment for an experimental digital long-haul transmission system using coaxial cable. A comparison, of different types of digital transmission systems indicates that the digital repeater hybrid system with binary transmission code is the most desirable. This development has resulted in digital pulse reshaping repeaters with very small di... View full abstract»

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  • Rural Subscriber Loops via Carrier and Radio

    Publication Year: 1975, Page(s):289 - 295
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (784 KB)

    Ever since carrier was developed for trunk usage, carrier for subscriber use, either over wire or radio, has been considered as a means for providing telephone service in rural areas. Starting with the Bell System development of its type power line carrier, there have been 34 years of progress and subscriber carrier is now a reality. It is now beginning ... View full abstract»

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  • Real-Time Updating of Maximum Usable Frequency Predictions for HF Radio Communication

    Publication Year: 1975, Page(s):286 - 288
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    A simple method is presented and illustrated for the updating of maximum usable frequency (MUF) predictions for a given HF propagation path by employing real-time observations of the MUF's for a different path. A test of the method performed by utilizing experimental data for two pairs of paths indicates that the updating technique provides significant reductions in the prediction errors. View full abstract»

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  • Timing Recovery in Synchronous Equalized Data Communication

    Publication Year: 1975, Page(s):269 - 274
    Cited by:  Papers (16)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    The best estimation of sampler timing in adaptively equalized systems is examined. First, two previous approaches to the estimation problem are reviewed and are found to have fundamental shortcomings. The first technique sets the timing instants coincident with the peak of the unequalized system impulse response. Under certain circumstances this technique can produce nulls in the spectrum of the s... View full abstract»

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  • The Effects of Equalization, Timing, and Carrier Phase on the Eye Patterns of Class-4 Partial-Response Data Signals

    Publication Year: 1975, Page(s):259 - 265
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    A general expression is derived for the eye pattern boundaries of a multilevel class-4 partial-response (PR) signal after single-sideband amplitude-modulation (SSBAM) transmission with a carrier phase error. From the expression particular results are obtained for the horizontal and vertical eye openings of the signal. Expressions are derived for the tap settings of a linear transversal equalizer u... View full abstract»

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  • On the Binary DPSK Communication Systems in Correlated Gaussian Noise

    Publication Year: 1975, Page(s):255 - 259
    Cited by:  Papers (9)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    Using the recently developed probability density function we obtain "directly" the error rate expressions for the binary differential phase-shift keyed (DPSK) systems when the noise values at the sampling instants in adjacent time slots are statistically dependent. Two cases are considered: One corresponding to equal SNR at each of the two sampling instants, and the other to unequal SNR's. The con... View full abstract»

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  • Some Results Concerning the Perception of Musical Distortion in Mistuned Single Sideband Links

    Publication Year: 1975, Page(s):299 - 301
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    Tests were performed over a good communications grade single sideband (SSB) channel on the listenability of various types of music under frequency shift distortion up to ± 30 Hz. Sensitivity to this type of distortion depends upon the type of music, and frequency shift should be less than ± 5 Hz to avoid noticeable degradation. View full abstract»

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  • A New Type of Digital Filter for Data Transmission

    Publication Year: 1975, Page(s):222 - 234
    Cited by:  Papers (22)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1328 KB)

    A digital filter is introduced consisting of a transversal part and a simple recursive network. The coefficients of the transversal part are equal to integer powers of two or zero; thus complicated multipliers are avoided and instead a simple routing circuit is used. Use of several types of the recursive network makes the filter applicable in different frequency ranges. The coefficients of the tra... View full abstract»

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  • Nonlinear Analysis of Correlative Tracking Systems Using Renewal Process Theory

    Publication Year: 1975, Page(s):192 - 203
    Cited by:  Papers (33)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1056 KB)

    A new method is presented which describes the behavior of an (N + 1) th-order tacking system in which the nonlinearity is either periodic [phase-locked loop (PLL) type] or a nonperiodic [delay-locked loop (DLL) type]. The cycle slipping of such systems is modeled by means of renewal Markov processes. A fundamental relation between the probability density func... View full abstract»

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  • A Digital Block-Processor for SSB-FDM Modulation and Demodulation

    Publication Year: 1975, Page(s):282 - 286
    Cited by:  Papers (14)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    A new algorithm is proposed for the digital implementation of the M -channel SSB-frequency-division multiplexing (FDM) modulator and demodulator, which is computationally attractive and inherently insensitive to parameter quantization. View full abstract»

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  • Optical Waveguides with Noninteracting Beam-Slope Stabilizers

    Publication Year: 1975, Page(s):235 - 239
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (576 KB)

    Ray position in slope-controlled waveguides is studied. A linear combination of three consecutive position measurements is used to calculate the slope error of the middle lens. This is the error input to the middle lens positioning system. Independent lens correction results and thus a decoupling of space and time response is achieved. The system is shown to be stable. Overshoot in the transient r... View full abstract»

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  • Impulsive Noise in Noncoherent M-ary Digital Systems

    Publication Year: 1975, Page(s):246 - 252
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (616 KB)

    This concise paper analyses the performance of noncoherent M -ary digital systems in presence of a generalized stationary Poisson impulsive noise process, with a receiver operating as a maximum likelihood detector in white Gaussian interference. Methods to bound the error probability for ASK, PSK, and FSK systems in the cases where the noise is impulsive and qu... View full abstract»

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  • Intelligible Crosstalk in Nonlinear Amplifiers: Calculation of AM-PM Transfer

    Publication Year: 1975, Page(s):265 - 269
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    This concise paper analyzes the transfer of amplitude modulation from one sinusoidal carrier to phase modulation of other carriers passing through the same memoryless nonlinear device. It gives exact expressions for the AM-PM transfer coefficient, which is one part of the mechanism that leads to intelligible crosstalk, and the expressions are valid for sinusoidal carriers in the presence of Gaussi... View full abstract»

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  • Selection of Call Progress Tones for Digital Systems

    Publication Year: 1975, Page(s):301 - 302
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    The precise tone system based on the four basic frequencies 350, 440, 480, and 620 Hz is extensively used in switching systems to indicate readiness to dial, ringing of the called subscriber, lines or trunks busy, and other conditions. In digital switching systems it is normally advantageous to generate and process these tones in a digital form. It is shown that by judicious selection of the tone ... View full abstract»

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  • Finite Lag Receivers for Analog Communication

    Publication Year: 1975, Page(s):204 - 213
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (936 KB)

    The problem of designing optimum receivers with a finite built-in delay, for a class of stochastic signals, is considered. The approach used here is based on the so-called fixed-lag smoothing techniques. Specific cases of amplitude and phase modulation are considered in detail to illustrate the type of optimal (suboptimal in the nonlinear case) receivers which are obtained using this approach. The... View full abstract»

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  • Pull-In Frequency for a Pulse-Tracking Phase-Locked Loop with Imperfect Integration

    Publication Year: 1975, Page(s):252 - 254
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    Automatic detection using correlation relies on a phaselocked loop for synchronization. If the loop contains an imperfect integrator, only a finite error frequency (pulse rate) can be tracked. This concise paper yields the transcendental equations (and some specific numerical results for a maximally flat loop response) that relate duty-cycle, loop-bandwidth, integrator imperfection, and pull-in fr... View full abstract»

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  • Signal Design for Totally Phase-Incoherent Communications

    Publication Year: 1975, Page(s):213 - 221
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (808 KB)

    A set of M equally-likely equal-energy transmittable signals is considered, each of which consists of a linear combination of tones from D free running oscillators (D \leq M) . The oscillator tones are assumed sufficiently disjoint to be orthogonal. The design problem consists of findi... View full abstract»

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  • Expected Crosstalk Performance of Analog Multichannel Subscriber Carrier Systems

    Publication Year: 1975, Page(s):240 - 245
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (592 KB)

    This paper determines the intelligible crosstalk performance of analog multichannel subscriber carrier systems. Using a 0.1 percent probability of intelligible crosstalk objective, the calculations determine that the equal level far-end crosstalk loss must exceed 55.6 dB. Based on crosstalk measurements of in-service cables in South Central Bell, it is shown that only a small fraction of the pairs... View full abstract»

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  • Message Path Delays in Packet-Switching Communication Networks

    Publication Year: 1975, Page(s):186 - 192
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (792 KB)

    A communication path (in isolation) in a packet-switching store-and-forward communication network, such as a computer or satellite-communication network, is considered. Messages are assumed to arrive according to a Poisson stream, and messagelengths are considered to be random variables governed by an arbitrary distribution. Message lengths are divided into fixed-length packets which are sent inde... 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