IEEE Transactions on Communications

Issue 3 • March 1977

Filter Results

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

    Publication Year: 1977, Page(s): 0
    Request permission for commercial reuse | |PDF file iconPDF (162 KB)
    Freely Available from IEEE
  • Probability of Block Error for Very Slow Rayleigh Fading in Gaussian Noise

    Publication Year: 1977, Page(s):368 - 374
    Cited by:  Papers (36)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (684 KB)

    Expressions for probability of block error,P_{f}(M,N), the probability of more thanMerrors in a block ofNdigits, are derived for binary signaling over a channel with very slow nonselective Reyleigh fading and additive Gaussian noise. The analysis is applicable to noncoherent FSK, coherent FSK, and coherent PSK signaling. An asymptotic expression for the block error... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Some Observations on the Statistics of Beyond-the-Horizon Transionospheric Propagation from a Satellite

    Publication Year: 1977, Page(s):379 - 383
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (428 KB)

    The HF signals radiated (from heights aboveF_{2}h_{max}) by the first satellite orbited by the Peoples Republic of China (1970-34A) were monitored at a ground site in Florence, Italy. Beyond-Beyond-the-horizon reception with distances up to antipodality were repeatedly observed. Path loss improvement with respect to free space was typically 4 dB for distances of 12 000 km and 8 dB for d... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • [Back cover]

    Publication Year: 1977, Page(s): 0
    Request permission for commercial reuse | |PDF file iconPDF (166 KB)
    Freely Available from IEEE
  • Demodulation Procedure for Very Wide-Band FM

    Publication Year: 1977, Page(s):318 - 327
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (784 KB)

    Since conventional FM demodulators are incapable of accurately demodulating very wide-band frequency-modulated signals, a new approach to the problem is needed. Based upon a theorem by Sandberg, a practical procedure is presented for demodulating not only typical FM signals but also those employing modulation bandwidths and/or frequency deviations on the order of the cartier frequency. The propose... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Analysis of a Microwave Feedforward Amplifier Using Volterra Series Representation

    Publication Year: 1977, Page(s):355 - 360
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (584 KB)

    The use of feedforward correction to reduce nonlinear distortion in a microwave amplifier is investigated, using the Volterra series approach. Expressions are derived for the suppression of main amplifier distortion, in terms of the circuit parameters of the system. It is shown that the gain and phase imbalance in the second interference loop mainly determine the distortion suppression in the feed... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Analog Versus Digital Antijam Video Transmission

    Publication Year: 1977, Page(s):310 - 317
    Cited by:  Papers (3)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1056 KB)

    This paper presents an evaluation of the relative performance provided by analog and digital video modulation approaches. Antijam (AJ) performance of these modulations is considered when used in concert with spread-spectrum techniques such as frequency hopping, and direct sequence pseudorandom modulation. These modulation approaches are compared on the basis of power efficiency, required channel b... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Tracking Loops for Carrier Reconstruction in Vestigial Sideband (VSB) Suppressed-Carrier Data Transmission

    Publication Year: 1977, Page(s):374 - 379
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (584 KB)

    This paper deals with a tracking-loop-type approximation to the maximum likelihood (ML) estimator of the carrier phase in a suppressed-carrier vestigial sideband (VSB) data-transmission system. Two different tracking loops are considered, the one resembling a Costas loop, the other a data-aided receiver (DAR). The performance of these circuits is analyzed in the presence of thermal noise and inter... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An Economical RC Active Equalizer with Applications in Communications

    Publication Year: 1977, Page(s):383 - 386
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (368 KB)

    A simple active equalizer network employing two operational amplifiers (OA's), five resistors, and a pair of capacitors is presented. The same network can be used for both amplitude and delay equalizations. Experimental results show that the circuit can be conveniently used for amplitude equalization in voice communications, and for delay equalization in private line data circuits. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Unified Approach to Pulse Design in Data Transmission

    Publication Year: 1977, Page(s):346 - 354
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (888 KB)

    The problem of designing optimum pulseshapes for data transmission over randomly selected channels is examined using a meansquared error criterion. Earlier work has focused principally on SSB or VSB systems in the presence of timing and carrier phase jitter, but we extend the results here to any two-dimensional signaling scheme (including as special cases SSB, VSB, combined AM-PM, QAM, and stagger... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Comparison of Digital Transmission Techniques for Standard FM Mobile Radio Sets

    Publication Year: 1977, Page(s):364 - 368
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (576 KB)

    Digital transmission for existing standard FM mobile radio sets is discussed. The transmission properties of such standard sets are presented. Various data pre-encoding techniques and the corresponding decoders are considered and their performances compared, The comparison includes consideration of the radiated FM spectra, the measured bit error rate curves, and the necessary complexity. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Sidelobe Height and Placement of Quasi-Complementary Sequences

    Publication Year: 1977, Page(s):386 - 390
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (392 KB)

    The rules given in this correspondence enable the positions and amplitudes of the nonzero sidelobes of quasi-complementary sequences to be determined without use of a computer and without knowing the autocorrelation functions of the individual codes beforehand. They enable the system designer to synthesize a set of codes directly from system specifications. They also shed light on the code structu... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Noncoherent Pseudonoise Code Tracking Performance of Spread Spectrum Receivers

    Publication Year: 1977, Page(s):327 - 345
    Cited by:  Papers (80)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (984 KB)

    The optimum design and performance of two noncoherent PN tracking loop configurations, namely, the delay-locked loop and tau-dither loop, are described. In particular, the bandlimiting effects of the bandpass arm filters are considered by demonstrating that for a fixed data rate and data signal-to-noise ratio, there exists an optimum filter bandwidth in the sense of minimizing the loop's tracking ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The SCEM-Phase-Lock Loop and Ideal FM Discrimination

    Publication Year: 1977, Page(s):390 - 392
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (216 KB)

    The conventional phase-lock loop requires a low-pass filter in the loop to eliminate the double-frequency terms which arise in the phase detector. Because of this filtering, the closed-loop bandwidth is necessarily small. A new phase-lock loop is introduced, the SCEMPLL, whose phase detector requires no filtering; hence, this phase-lock loop has a wide closed-loop bandwidth and, resultantly, appro... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A µ255 Encoder Requiring No Precision Components

    Publication Year: 1977, Page(s):297 - 303
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (656 KB)

    A new structure for an analog-to-digital converter encoding to the μ-law companding characteristic is described. Timing accuracy substitutes for component accuracy so that no precision components are required and integration is made easier. Numerous models have been constructed and found to work exceptionally well. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Intermodulation Performance of Solid-State UHF Class-C Power Amplifiers

    Publication Year: 1977, Page(s):304 - 310
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (592 KB)

    In any frequency-division-multiple-access (FDMA) satellite communication system the control of intermodulation noise must be considered if all signals are amplified by a single nonlinear power amplifier in the satellite transponder. The subject of this paper is the use of Fourier-Bessel series expansion models in the prediction of the intermodulation performance of both traveling-wave-tube (TWT) a... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Optical Pulse Position Modulation with Multiple Positions per Pulsewidth

    Publication Year: 1977, Page(s):360 - 364
    Cited by:  Papers (41)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (440 KB)

    This concise paper determines the required laser power to achieve a given probability of bit error using a pulse-interval modulation (PIM) (discrete pulse position modulation) system with resolution much smaller than a laser pulsewidth. An approximation to the first crossing density for a threshold detector operating on a filtered Poisson process is used. Both analytic and computer simulation resu... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.

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