IEEE Transactions on Communications

Issue 6 • June 1978

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Displaying Results 1 - 25 of 33
  • [Front cover and table of contents]

    Publication Year: 1978, Page(s): 0
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    Freely Available from IEEE
  • Editorial

    Publication Year: 1978, Page(s): 745
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    Freely Available from IEEE
  • Evaluations of Error Control Techniques in Both Independent-Error and Dependent-Error Channels

    Publication Year: 1978, Page(s):785 - 794
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (923 KB)

    Error control techniques in the various digital data transmission systems can be divided into three classes, i.e., classes of forward error correction (FEC), automatic repeat request (ARQ), and FEC embedded within ARQ (Hybrid). We exactly analyze and compare the performances of these error control techniques in both independenterror and dependent-error channels. It is shown that among the various ... View full abstract»

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  • A Fake Process Approach to Data Compression

    Publication Year: 1978, Page(s):840 - 847
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (845 KB)

    The problem of designing a good decoder for a timeinvariant tree-coding data compression system is equivalent to that of finding a good low rate "fake process" for the original source, where the fake is produced by a time-invariant nonlinear filtering of an independent, identically distributed sequence of uniformly distributed discrete random variables and "goodness" is measured by thebar{rho... View full abstract»

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  • Soft Decision Demodulation for PCM Encoded Speech Signals

    Publication Year: 1978, Page(s):854 - 859
    Cited by:  Papers (6)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (558 KB)

    The effect of digital errors in PCM encoded speech signals transmitted over a noisy channel is reduced by using soft decision demodulation at the receiver. The reliability information supplied by the soft decision demodulator is used to point out likely transmission errors, especially in the most significant PCM bits. When a likely transmission error is identified, the corresponding PCM word is re... View full abstract»

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  • Differential pulse-code modulation of the Wiener process

    Publication Year: 1978, Page(s):881 - 887
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (525 KB)

    The performance of DPCM (Differential Pulse Code Modulation) with uniform quantization with the Wiener process input is analyzed. The approach taken is to establish an equation for the characteristic function of error distribution and then to solve its steady-state version. No use is made in the derivation of the approximating concepts of slope overload error and granular error. Exact formulas are... View full abstract»

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  • Network Synchronization by Means of a Returnable Timing System

    Publication Year: 1978, Page(s):892 - 896
    Cited by:  Papers (12)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (409 KB)

    This paper investigates a new method of compensating for the transmission delays encountered in communications networks employing mutual synchronization. The compensation technique suggested belongs to the category of the single-ended methods in the sense that all the phase measurements affecting the control signal supplied to the local oscillator are carried out at that particular node; however, ... View full abstract»

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  • Subjective Tests of a Companded, Frequency Modulated, Single Channel Per Carrier Communication System

    Publication Year: 1978, Page(s):917 - 922
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (663 KB)

    Subjective tests were performed to evaluate components of an FM-SCPC communications system including a syllabic compandor, a VOX circuit, and a shallow emphasis network. The subjective improvements in the signal-to-noise ratio were determined for these components separately and in combination. Tests of the syllabic compandor were conducted at four talker levels and at two values ofC/kTf... View full abstract»

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  • Parasitic Spectral Lines in High Speed Generation of Binary Maximum Length Sequences

    Publication Year: 1978, Page(s):922 - 925
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (294 KB)

    Adding modulo-2 a binary maximum length sequence to its replica delayed by half the maximal length,N, results in the same sequence but at twice the bit rate. The error in the spectral density of the resulting sequence which is created by delaying the replica by(N/2) + epsiloninstead ofN/2is examined, and the analytical formulas are derived. View full abstract»

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  • On the Computation of the Discrete Cosine Transform

    Publication Year: 1978, Page(s):934 - 936
    Cited by:  Papers (201)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    AnN-point discrete Fourier transform (DFT) algorithm can be used to evaluate a discrete cosine transform by a simple rearrangement of the input data. This method is about two times faster compared to the conventional method which uses a2N-point DFT. View full abstract»

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  • [Back cover]

    Publication Year: 1978, Page(s): 0
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    Freely Available from IEEE
  • The Fadeogram, A Sonogram-Like Display of the Time-Varying Frequency Response of HF-SSB Radio Channels

    Publication Year: 1978, Page(s):913 - 917
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (896 KB)

    A method is presented for displaying the time-varying transfer characteristic of communication channels, and is illustrated by showing in detail the behavior of an HF-SSB radio channel during one minute periods, under the various fading characteristics classified by USAEL. It is also demonstrated how this method aided study of the causes of errors in data received by digital modems. View full abstract»

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  • Minimum-Shift-Keying Signal Detection with Noisy Reference Signals

    Publication Year: 1978, Page(s):896 - 902
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    The performance of a minimum-shift-keying (MSK) system has been studied in which the carrier and clock references are noisy and derived from the received waveform by means of narrowband tracking loops. It has been found that the probability of error is greatly affected by the characteristics of the synchronization structures and that the system is more sensitive to demodulation phase errors than t... View full abstract»

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  • The Effects of Large Interference on the Tracking Capability of Digitally Implemented Echo Cancellers

    Publication Year: 1978, Page(s):833 - 839
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (688 KB)

    Adaptive mean-square-tapped-delay-line echo cancellers for voice applications are conventionally designed to stop adjustment during periods of "double-talking", i.e., when a large informationbearing signal is present along with the echo signal to be cancelled. Continuous adaption is, however, desirable in full-duplex, two-wire data transmission where the periods of double-talking are so long that ... View full abstract»

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  • Asymptotic Performance of Delayed Delta Coding with Single and Double Integration

    Publication Year: 1978, Page(s):907 - 913
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (712 KB)

    A study of the asymptotic performance of delta coding with delayed decision is presented for the cases of first and second order integration assuming a stationary, bandlimited Gaussian source. The resulting signal-to-distortion-ratio serves as an upper bound for any delayed (multipath) decision scheme provided that the sampling rate exceeds the Nyquist rate by a factor greater than about two. The ... View full abstract»

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  • The Evaluation of Satellite Link Availability

    Publication Year: 1978, Page(s):847 - 853
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (736 KB)

    The need to predict overall link availability in a satellite communications system has motivated efforts to devise theoretical and empirical models to predict fade statistics for line of site propagation between an earth station and a satellite. Investigators have largely concentrated on measuring and analyzing the key propagation phenomena, especially attenuation and depolarization due to rainfal... View full abstract»

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  • The Influence of Finite Bandwidth on the Capture Effect in FM Demodulators

    Publication Year: 1978, Page(s):776 - 784
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (816 KB)

    In this paper a formula is derived for the capture ratio of an FM demodulator of which the finite bandwidth has been taken into account. The results obtained in a numerical example are in complete agreement with the measurements made on a physical detector. View full abstract»

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  • The Effect of Acknowledgment Traffic on the Capacity of Packet-Switched Radio Channels

    Publication Year: 1978, Page(s):815 - 826
    Cited by:  Papers (36)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1056 KB)

    We consider a population of terminals communicating with each other or with a central station over a packet-switched multiple access radio channel. To ensure the integrity of the transmitted data over the multi-access channel, we consider a reliable method using an error detecting block code in conjunction with a positive acknowledgment of each correct message. In this paper, we study the effect o... View full abstract»

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  • Maximum-Likelihood Decoding of Binary Convolutional Codes on Band-Limited Satellite Channels

    Publication Year: 1978, Page(s):766 - 776
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1032 KB)

    Viterbi decoding of binary convolutional codes on bandlimited channels exhibiting intersymbol interference is considered, and a maximum likelihood sequence estimator algorithm is derived. This algorithm might be applied either to increase the allowable data rate for a fixed power transmitter or to reduce the required power for a fixed data rate. Upper and lower bounds on the bit error rate perform... View full abstract»

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  • A Comparison of Two Source Encoding Schemes

    Publication Year: 1978, Page(s):887 - 892
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    The implementation complexity and error performance of buffered variable length (BVL) encoding and typical sequence block (TSB) encoding for discrete memoryless sources using a synchronous channel are compared. The BVL encoding is found to be superior to the TSB encoding when the BVL buffer size and TSB block length are sufficiently large. View full abstract»

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  • Two-Way Radio and One-Way Paging: A Method for Operational and Economic Comparison

    Publication Year: 1978, Page(s):939 - 944
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    A method of analysis is presented which allows the evaluation and comparison of two-way voice radio and one-way tone-voice paging. Using several mathematical models to describe operational and economic characteristics, including a queuing model of message delay, an illustrative analysis is made with values of parameters obtained from an actual company. Results of this kind of analysis offer insigh... View full abstract»

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  • A Comment on "Probability of Error in PN-Modulated Spread Spectrum Binary Communication Systems"

    Publication Year: 1978, Page(s):932 - 934
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    Examination of the interference power of spread spectrum PN systems gives a result approximately twice as large as that reported by Hopkins and Simpson [1]. The additional factor is due to a correlation between intersymbol interferences at different chip times. A corrected characteristic function for the interference is given here. View full abstract»

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  • New Fiber Optic Analog Baseband Transmission Plan for Color TV Signals

    Publication Year: 1978, Page(s):902 - 907
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    A new fiber optic baseband analog transmission plan is proposed. It arranges the original signal into a pulse train for driving the laser diode to generate baseband components at the transmitter. The receiver can be just the same as those used in conventional direct linear intensity modulation systems using light emitting diodes (LED). Advantages of this new plan are (i) potentially cheap fibers c... View full abstract»

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  • Fixed-Tap ADPCM System Divergence and a Bound on the Robust Quantizer Overload Point

    Publication Year: 1978, Page(s):827 - 832
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    The divergence of ADPCM systems with fixed, multipletap predictors and a Jayant quantizer is investigated. It is shown that system divergence occurs due to excessive quantization noise in the feedback loop coupled with the infinite quantizer memory. Further, divergence may result for even finer quantization if the predictor is poorly matched with the system input. New insight into quantizer/ predi... View full abstract»

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  • On the Characterization of a Bandpass Nonlinearity by Two-Tone Measurements

    Publication Year: 1978, Page(s):746 - 754
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (800 KB)

    The characteristics of a bandpass nonlinearity are expressed in this paper by a finite series expansion of the complex envelope transfer function. This function is commonly acquired by direct measurement of the single-carrier envelope characteristics. This paper describes an alternative method whereby the complex envelope transfer function is obtained by measuring the power of the intermodulation ... 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