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Communications, IEEE Transactions on

Issue 6 • Date June 1974

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Displaying Results 1 - 25 of 39
  • [Front cover and table of contents]

    Publication Year: 1974 , Page(s): 0
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  • Comments on "Threshold Analysis of Phase Locked Loop Modulators Using Most Likely Noise"

    Publication Year: 1974 , Page(s): 883 - 884
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    Useful comments on a recent paper by Osborne and Schilling, concerning the occurrence of spikes, are offered in this correspondence. View full abstract»

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  • Comments on "The Amplitude Densities of Single-Tone Amplitude Modulated (AM) Waveforms"

    Publication Year: 1974 , Page(s): 883
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  • Author's reply

    Publication Year: 1974 , Page(s): 883
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  • Author's reply

    Publication Year: 1974 , Page(s): 884
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  • Comments on "The Estimate Feedback Equalizer: A Suboptimum Nonlinear Receiver"

    Publication Year: 1974 , Page(s): 885
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  • Author's reply

    Publication Year: 1974 , Page(s): 885 - 886
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  • Comments on "An Analysis of Polyphase Envelope Detection"

    Publication Year: 1974 , Page(s): 886
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    A true envelope detector is presented and compared with the polyphase envelope detector. It theoretically has no carrier feedthrough. View full abstract»

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  • Author's reply

    Publication Year: 1974 , Page(s): 886 - 887
    Cited by:  Papers (1)
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  • Reply by D.P. Olsen

    Publication Year: 1974 , Page(s): 887
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  • Remarks by C.W. Lee

    Publication Year: 1974 , Page(s): 887
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  • [Back cover]

    Publication Year: 1974 , Page(s): 0
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  • Telecommunication Systems Engineering--W. C. Lindsey and M. K. Simon

    Publication Year: 1974 , Page(s): 888
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  • Response of an All Digital Phase-Locked Loop

    Publication Year: 1974 , Page(s): 751 - 764
    Cited by:  Papers (18)  |  Patents (8)
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    An all digital phase-locked loop (DPLL) is designed, analyzed, and tested. Three specific configurations are considered, generating first, second, and third order DPLL's; and it is found, using a computer simulation of a noise spike, and verified experimentally, that of these configurations the second-order system is optimum from the standpoint of threshold extension. This substantiates results obtained for analog PLL's. View full abstract»

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  • The Spectrum of a TDM PPM Signal

    Publication Year: 1974 , Page(s): 864 - 866
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    The spectrum of a time-division-multiplexed (TDM) pulse-position-modulated (PPM) signal consists of three parts-the continuous part, which is simply the sum of the continuous parts of the spectra of the separate channels; lines on harmonics of the maximum overall pulse-repetition frequency (PRF), which are also independent of any permutation among the channels; and the lines on the other harmonics of the single-channel PRF. Simple expressions are found for all three parts under the assumption that N - m - n channels are empty, n are unmodulated, and the remaining m contain independent, identically uniformly distributed pulse positions. A complicated expression is found for the variances of the lines in the last part of the spectrum under a random choice of the modulated and unmodulated channels, and a simple approximation is presented for it. View full abstract»

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  • On the Estimation of the Second-Order Statistics of Log Normal Fading in Mobile Radio Environment

    Publication Year: 1974 , Page(s): 869 - 873
    Cited by:  Papers (34)
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    It is observed that the estimation of mean signal strength in the mobile radio environment has inherent uncertainties. These may not influence the observed distribution of the mean signal strength but would certainly mask efforts to obtain level crossing rates and duration of fades. A new parameter, duration of stay, is defined which appears to be insensitive to the granular variations of the mean signal strength and would be helpful in the determination of the switching rate in a base station diversity system. View full abstract»

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  • The Transcribed Demonstration

    Publication Year: 1974 , Page(s): 846 - 848
    Cited by:  Patents (3)
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    A new system of self-instruction which combines the desirable features of video tape and analog graphic recording is developed. By means of multiplexing techniques, four types of information are recorded on standard video tape: 1) video, 2) voice, 3) three channels of physiological data, and 4) control signals for the operation of auxiliary equipment. The latter three are combined and applied to a single audio track of the video tape recorder by successive time-division and frequency-division multiplexing; the video channel is unaltered. View full abstract»

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  • An Adaptive Equalizer for Partial Response Signals with Improved Convergence Properties

    Publication Year: 1974 , Page(s): 884 - 885
    Cited by:  Papers (1)
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    For the equalization of linearly distorted partial response signals a new equalizer adjustment algorithm is described, which combines fast convergence, ease of implementation, and the possibility of using the same adjustment method during start-up and subsequent transmission. View full abstract»

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  • Quasi-Optimal Demodulation of Pulse-Frequency Modulated Signals

    Publication Year: 1974 , Page(s): 862 - 864
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    Novel demodulator structures are derived for quasioptimal on-line demodulation of pulse-frequency modulated (PFM) signals in the presence of white Gaussian channel noise. The basic demodulator consists of a phase-locked loop with its integrators appropriately reset as each new pulse is received. This modulator may be augmented with additional integrators and gain elements to achieve quasi-optimal demodulation with delay. The quasi-optimal demodulation approaches optimal demodulation, in the minimum mean-square error sense, as the signal-to-noise ratio increases. The various quasi-optimal receivers are derived by application of the extended Kalman filter theory to a state-space signal model. View full abstract»

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  • A Source Encoding Algorithm for Quantized Data

    Publication Year: 1974 , Page(s): 867 - 869
    Cited by:  Patents (2)
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    A source encoding algorithm which is suitable for quantized data is presented. The algorithm is intuitive rather than rigorous and has good performance over a wide range of inputs with only one variable parameter. Consequently, it is applicable to situations in which the source statistics are only partially understood or are time varying. The algorithm is explained, and some of its properties and performance are explored. View full abstract»

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  • Performance Evaluation of Reliability Improvement Techniques for Single-Loop Communications Systems

    Publication Year: 1974 , Page(s): 742 - 751
    Cited by:  Papers (16)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (944 KB)  

    One of the basic terminal-attachment configurations is the loop. As such, it is receiving substantial attention. But it has been pointed out that loop communication networks are relatively vulnerable and unreliable. This paper considers the single-loop reliability problem. Three loop reliability (availability) improvement techniques are investigated in detail. All three techniques are based on using an auxilliary transmission path parallel to the main loop. A comparative study shows the best techniques. View full abstract»

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  • Parameter Estimation for an Adaptive Instrumentation of Hall's Optimum Receiver for Digital Signals in Impulse Noise

    Publication Year: 1974 , Page(s): 798 - 802
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    Newton's method for root finding is shown to be an effective algorithm for computing maximum likelihood estimates of the bias parameter in Hall's optimum receiver for digital singals in impulse noise. Use of a bias estimator allows the receiver to be adaptively instrumented. A simulation indicates that the number of independent samples of the impulse noise, as modeled by Hall, should be around 20 000 for satisfactory parameter estimates. View full abstract»

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  • Probability Distributions for Noise Plus Several Sine Waves--The Problem of Computation

    Publication Year: 1974 , Page(s): 851 - 853
    Cited by:  Papers (18)
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    The problem of computing the distributions of the envelope and instantaneous value of the sum of several sine waves plus Gaussian noise is reviewed. It is pointed out that the associated integrals can be efficiently evaluated by the trapezoidal rule except when the noise is small. Approximations which hold when the noise is small are given. View full abstract»

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  • Performance Evaluation Criteria of Hybrid Microwave Systems

    Publication Year: 1974 , Page(s): 873 - 877
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    Performance evaluations and measurement principles of hybrid information carriers, that is, carriers for partly analog and partly digital source infomation, are established. Simulation requirements, which are independent from a particular hybrid configuration or system capacity, for the analog and digital sources are presented. In order to perform the analysis of multilevel digital streams, a simple formula for the power spectrum density of the random n -level Gray-coded stream is derived. With normalization of the formula, the same power density spectrum for any number of levels is achieved. The required length of the pseudorandom sequence as a function of the transmission characteristics and hybrid environment is established. The measurement difficulties, when the noise source is not Gaussian, are discussed. View full abstract»

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  • Lower Bounds for Finite Intersymbol Interference Error Rates

    Publication Year: 1974 , Page(s): 853 - 857
    Cited by:  Papers (12)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (488 KB)  

    Some simple lower bounds for the probability of error for band-restricted digital communication are presented. The bounds revolve two values of the complementary error function, the system SNR, the peak value, second moment, and sometimes, the fourth moment of the intersymbol interference. Contrary to other available lower bounds, no parameter searches or infinite series computations are required. The bounds hold when the system "eye" is open and in some cases when the source symbols are correlated. 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