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Communications, IEEE Transactions on

Issue 3 • Date March 1974

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Displaying Results 1 - 20 of 20
  • [Front cover and table of contents]

    Publication Year: 1974 , Page(s): 0
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  • Comments on "Effect of Hard Limiting on a Quadrature PSK Signal"

    Publication Year: 1974 , Page(s): 348
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  • Author's reply

    Publication Year: 1974 , Page(s): 348 - 349
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  • [Back cover]

    Publication Year: 1974 , Page(s): 0
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    Freely Available from IEEE
  • Uniform Quantizers for Noisy Channels

    Publication Year: 1974 , Page(s): 323 - 326
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (384 KB)  

    We consider optimum uniform data quantization for noisy channels. We present a general formulation for natural encoding that results in simple expressions for the mean-square error. Specifically, we show that the optimum location of the center of the quantizer is at the mean of the distribution for all error rates. The optimum levels for quantization and the corresponding mean-square error are pre... View full abstract»

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  • A Technique for Using a Time-Multiplexed Second-Order Digital Filter Section for Performing Adaptive Filtering

    Publication Year: 1974 , Page(s): 326 - 330
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (472 KB)  

    Digital filters are commonly designed in the form of a cascade of recursive second-order sections. Filters designed this way can be realized, in hardware, by building a single second-order section and then time multiplexing it to perform all the required operations. On the other hand, adaptive filters, such as adaptive equalizers, are generally nonrecursive. In this paper, a technique is described... View full abstract»

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  • Delta Modulation of Data Signals

    Publication Year: 1974 , Page(s): 334 - 339
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (424 KB)  

    This paper is an analytical study to determine the performance of single-integration delta-modulation (\Delta M) encoders with inputs which are various voice-band data signals. Signal-to-quantizing noise ratios S/N are calculated for \Delta M bit rates from 16 to 96 K bits/s. The i... View full abstract»

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  • A Single Channel Station Carrier System for Permanent Service Applications

    Publication Year: 1974 , Page(s): 312 - 319
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    The 84A station carrier system was designed to have cost and performance parameters competitive with paired cable for a majority of new subscriber loops. The system design incorporates a number of unique features, not provided by previous single channel systems, which are necessary for permanent service applications. These include: bridged ringing with ring-trip during ringing, central office powe... View full abstract»

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  • Ambiguity Resolution in Systems Using Omega for Position Location

    Publication Year: 1974 , Page(s): 305 - 312
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (728 KB)  

    The lane ambiguity problem prevents the utilization of the Omega system for many applications such as locating buoys and balloons. The method of multiple lines of position introduced herein uses signals from four or more Omega stations for ambiguity resolution. The coordinates of the candidate points are determined first through the use of the Newton iterative procedure. Subsequently, a likelihood... View full abstract»

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  • Calculation of Intermodulation from a Single Carrier Amplitude Characteristic

    Publication Year: 1974 , Page(s): 319 - 323
    Cited by:  Papers (25)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (552 KB)  

    The intermodulation analysis presented in this paper is based on the important observation that any output component of a memoryless nonlinear device can be expressed as an integral of the product of two functions, one being the single carrier amplitude characteristic of the nonlinear device and the other being a function of the statistical parameters of the input signal. The analysis can also be ... View full abstract»

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  • The Behavior of a Hold-and-Forward Concentrator for a Type of Dependent Interarrival Statistics

    Publication Year: 1974 , Page(s): 273 - 278
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (544 KB)  

    Up till now (Chu [1], Rudin [3]), the overflow probabilities of a hold-and-forward concentrator have been determined assuming that the pooled traffic of a number of terminal users at the input of the concentrator has a completely independent interarrival statistic between the characters. A closer analysis of the data going from one user to a computer shows that the user burst segments are separate... View full abstract»

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  • A Use of Limit Cycle Oscillations to Obtain Robust Analog-to-Digital Converters

    Publication Year: 1974 , Page(s): 298 - 305
    Cited by:  Papers (89)  |  Patents (31)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (816 KB)  

    High quality analog-to-digital conversions are obtained using simple and inexpensive circuits that require no high-precision components. Samples of the analog signal are cycled rapidly through a coarse quantizer while the roundoff error is fed back and subtracted from the input. By means of this feedback, the coarse quantizations are caused to oscillate between levels, keeping their running averag... View full abstract»

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  • Signal Coding Using Asynchronous Delta Modulation

    Publication Year: 1974 , Page(s): 346 - 348
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (536 KB)  

    A description is given for a delta modulation system wherein the sampling interval is varied as a function of the characteristics of the signal to be coded. The system thus operates asynchronously as compared with the usual delta modulator, and permits the transmission of fewer samples during periods of small signal variation. The algorithm used for sampling interval variation is common to both tr... View full abstract»

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  • Computation of Bit-Error Probability Using the Trapezoidal Integration Rule

    Publication Year: 1974 , Page(s): 331 - 334
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (432 KB)  

    It is shown in this paper that bit-error probabilities for some typical digital communication systems can be accurately and efficiently evaluated using the elementary trapezoidal integration rule. Examples involving intersymbol interference and a Rayleigh fading channel are worked. View full abstract»

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  • The Power Spectrum of a Digital Signal

    Publication Year: 1974 , Page(s): 349 - 350
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (272 KB)  

    An analysis of the spectra of digital signals is presented that includes Lundquist's and Glance's results for PSK signals as special cases while at the same time being much simpler than previous analyses. The signal is assumed to be modulated in phase and/or amplitude by a sequence of pulses that may have different shapes for different symbols. In addition, the pulse representing a given symbol ma... View full abstract»

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  • Evaluation of the Q Function

    Publication Year: 1974 , Page(s): 342 - 346
    Cited by:  Papers (12)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (416 KB)  

    A convenient method of evaluating the Q function over the parameter space quarter plane is presented. The Q function is first expressed as an infinite series. The N term truncated series Q_{N}(a, b) is used to approximate View full abstract»

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  • The TAD Integrated Crosspoint Array-Application and Performance in Wescom's 501 EPABX

    Publication Year: 1974 , Page(s): 279 - 287
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (808 KB)  

    TAD is a mnemonic for threshold-activated diode or telephone access device. It was designed at Wescom for its new 501 telephone electronic private automatic branch exchange (EPABX). A single TAD is a composite p-n-p-n diode. 45 TAD's with associated exclusive path control have been integrated into a 5 × 9 monolithic crosspoint array and packaged in a 16-pin DIP. The 501 matrix is a 150 ×... View full abstract»

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  • Bounds on Error in Signal Parameter Estimation

    Publication Year: 1974 , Page(s): 340 - 342
    Cited by:  Papers (40)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (272 KB)  

    In this correspondence, the problem of lower bounds on mean-square error in parameter estimation is considered. Lower bounds on mean-square error can be used, for instance, to bound the performances, namely the attainable output signal-to-noise ratio, of pulse modulation transmission systems, such as pulse-position modulation (PPM) or pulse-frequency modulation (PFM). The tightest lower bounds to ... View full abstract»

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  • Combined Effects of Up- and Down-Link Fading Through a Power-Limiting Satellite Repeater

    Publication Year: 1974 , Page(s): 350 - 352
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (280 KB)  

    Evaluating the capacity of a satellite communication system requires accurate prediction of the combined effects of up and down-path fading. This correspondence derives an expression for the resultant channel fade probability distribution as a function of up- and down-path fade distributions and the satellite TW input-output (I/O) power transfer characteristic, and demonstrate that power limiting ... View full abstract»

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  • Binary Signaling over Channels Containing Quadratic Nonlinearities

    Publication Year: 1974 , Page(s): 288 - 298
    Cited by:  Papers (5)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (728 KB)  

    This paper examines the transmission of binary data signals over channels which contain quadratic nonlinearities and additive Gaussian noise. We consider the case where the channel is nonlinear with memory and where the signal is passed through an input receiver filter and sampled once every signaling interval. The samples are represented by a discrete Volterra series and a special case where the ... 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