IEEE Transactions on Communications

Issue 2 • February 1982

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  • [Front cover and table of contents]

    Publication Year: 1982, Page(s): 0
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    Freely Available from IEEE
  • A Measurement of the MARISAT L-Band Signals at Low Elevation Angles Onboard Mobil Aero

    Publication Year: 1982, Page(s):359 - 365
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (626 KB)

    The MARISAT-to-shipL-band signals used in maritime mobile satellite communications service are degraded by fading and scintillation at low elevation angles. These degradations are attributed to multipath effects arising from ionospheric, tropospheric, and/or sea surface diffractions. To characterize such degradations, measurements were made at the Southbury earth station and onboard the... View full abstract»

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  • A New Approach to the Design of a Phase Modulator with Low Nonlinear Distortion

    Publication Year: 1982, Page(s):372 - 375
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (248 KB)

    Phase modulation can most directly be effected by a device whose output is a sinusoidal function of its input. In this paper a phase modulator is described in which a linear segmental approximation of the sinusoidal function is used. Performance results in terms of a phase difference from perfect linearity (Delta Phi) and signal-to-distortion ratio (SDR) are given. For eight-segment app... View full abstract»

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  • On the Impact of HDLC Zero Insertion and Deletion on Link Utilization and Reliability

    Publication Year: 1982, Page(s):375 - 381
    Cited by:  Papers (3)  |  Patents (11)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (579 KB)

    In HDLC, a zero is inserted after every five consecutive "ones" in order to resolve ambiguity about the location of delimiters. In this paper, we generalize the number "five" as an arbitrary positive integernand study the impacts ofnon the link utilization for a noiseless channel and on the reliability for a noisy channel. The entropy of the sequence after this generalized ze... View full abstract»

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  • Power Spectrum of Angle Modulated Correlated Digital Signals

    Publication Year: 1982, Page(s):389 - 396
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (779 KB)

    The paper deals with the spectral analysis of both phase and frequency modulated digital signals with correlated messages, where correlation is obtained by encoding. Also, a possible general filtering of the baseband digital signal is taken into account. The method of computation is fast, since the computational complexity increases linearly with the baseband pulse duration. The main result is con... View full abstract»

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  • Comment on "Tracking Performance of the Filter and Square Bit Synchronizer"

    Publication Year: 1982, Page(s):407 - 410
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (327 KB)

    The method for evaluating the tracking performance in the above paper obliterates the contribution to the mean square error which is due to the cyclostationarity of the disturbances. Beside this, the pattern-dependent jitter has not been considered in the paper. Our results include the effect of cyclostationarity and the pattern-dependent jitter. View full abstract»

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  • Further Clarification on the Use of Bessel Function Expansion to Approximate TWTA Nonlinear Characteristics

    Publication Year: 1982, Page(s):418 - 419
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (137 KB)

    The Bessel function expansion has been used [1] to approximate the TWTA nonlinear characteristics to assist in the evaluation of intelligible crosstalk between FDM/FM carriers using the Shimbo-Pontano method [2]. In particular, the arbitrary constant α was chosen to be in the range of 100-1000. This correspondence presents a further theoretical clarification on the selection of suitable value... View full abstract»

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  • [Back cover]

    Publication Year: 1982, Page(s): 0
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    Freely Available from IEEE
  • FM Nonlinearity Due to Harmonic Distortion in the Carrier Path

    Publication Year: 1982, Page(s):365 - 367
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (312 KB)

    The intermodulation noise in FM transmission caused by harmonic distortion in the carrier path is calculated by deriving the second- and third-order terms of the distorted signal. Explicit relations are given in terms of filter delays, harmonic levels, and modulation transfer parameters. View full abstract»

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  • Minimizing Packet Waiting Time in a Multibeam Satellite System

    Publication Year: 1982, Page(s):305 - 316
    Cited by:  Papers (31)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1048 KB)

    In this paper, we examine the problem of time-slot assignment in an SS/TDMA system operating in a packet-switched environment. We seek to assign time slots in order to minimize average packet waiting time and in order to maximize transponder utilization. We show that an assignment which achieves both objectives exists and develop a branch-and-bound algorithm to find it. In addition, we suggest sev... View full abstract»

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  • Maximum Power Transmission in Mass-Limited Radio Systems

    Publication Year: 1982, Page(s):414 - 417
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (400 KB)

    A simple fundamental relationship is derived between antenna gain and transmitter power which maximizes the effective radiated power in mass-limited satellite systems. In the most common case, maximum effective radiated power is achieved when the payload mass is divided equally between the antenna system and the power system. Although this may have been known intuitively to satellite designers, to... View full abstract»

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  • On the Probability of Undetected Error for Linear Block Codes

    Publication Year: 1982, Page(s):317 - 325
    Cited by:  Papers (79)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (776 KB)

    The problem of computing the probability of undetected error is considered for linear block codes used for error detection. The recent literature is first reviewed and several results are extended. It is pointed out that an exact calculation can be based on either the weight distribution of a code or its dual. Using the dual code formulation, the probability of undetected error for the ensemble of... View full abstract»

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  • The Limit-Switched Loop: A Phase-Locked Loop for Burst Mode Operation

    Publication Year: 1982, Page(s):396 - 407
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (928 KB)

    In a time-division or burst mode communications systems, synchronization must be achieved within a short preamble time at the beginning of each burst. When used in such a system, a conventional phase-locked loop (PLL) occasionally exhibits a prolonged phase acquisition transient. This effect, known as hangup, occurs at a large value of phase error and may cause loss of a data burst. The present pa... View full abstract»

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  • A Study of Fairness in Packet-Switching Networks

    Publication Year: 1982, Page(s):346 - 353
    Cited by:  Papers (33)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (784 KB)

    The use of channel scheduling to improve a measure of fairness in packet-switching networks is investigated. This fairness measure is based on mean end-to-end delays derived from Kleinrock's classical model. The network designer can incorporate any desired relative delay among user classes into this fairness measure. It is found that scheduling is helpful in reallocating delay among user classes a... View full abstract»

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  • Digital Voice Storage in a Microprocessor

    Publication Year: 1982, Page(s):336 - 345
    Cited by:  Papers (5)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1184 KB)

    We describe digital encoding and automatic silenceediting techniques for PCM and ADPCM voice storage in the MC68000 microprocessor. We give program details for encoding, silence elimination, storage of active speech bursts and reconstitution of the signal upon read-back. Coding rates in the range 64 down to 16 kbits/s are implemented. We find that silent intervals corresponding, typically, to 20-4... View full abstract»

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  • An Adaptive Capacity Allocation Scheme in Telephone Networks

    Publication Year: 1982, Page(s):354 - 359
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (592 KB)

    This paper discusses adaptive capacity allocation for high-usage groups (direct routes) in telephone networks so as to best maintain performance for each hour's traffic load. We present two algorithms for this adaptive allocation scheme. The first, called a capacity allocation algorithm, determines capacity allocation in a manner that minimizes the maximum value of point-to-point blocking probabil... View full abstract»

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  • Artificial Signals and Identification Methods to Evaluate the Quality of Speech Coders

    Publication Year: 1982, Page(s):325 - 335
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1088 KB)

    Objective quality measures provide an economic and practical alternative to tedious and expensive subjective tests. Furthermore, some recently proposed measures predict quality values which correlate quite well with the subjective ones. The objective measures are particularly useful to test the influence of design parameters during the laboratory development of codec algorithms. In this paper the ... View full abstract»

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  • Detection of Coherent Optical Signals in Generalized Gaussian Noise

    Publication Year: 1982, Page(s):367 - 372
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (456 KB)

    Results of receiver performance for the detection of a coherent light signal in the presence of background radiation are obtained and compared for two different types of background noise: a Gaussian field and a Gaussian field whose complex analytic signal is not circularly symmetric. It is pointed out that the randomness in the noise radiation does not significantly diminish the probability of cor... View full abstract»

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  • Carrier Reference Error Sensitivity of a Viterbi Detector for PAM Data Transmission

    Publication Year: 1982, Page(s):410 - 414
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (472 KB)

    In this paper we extend the probability of error analysis for Viterbi detectors for PAM data transmission to include the effects of steady-state carrier reference errors. It has earlier been found that the Viterbi detector is sensitive to the effects of constant carrier phase errors. However, for two reasonably complicated voiceband pulses taken from the literature, we find that the Viterbi detect... View full abstract»

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  • Vector Quantizers and Predictive Quantizers for Gauss-Markov Sources

    Publication Year: 1982, Page(s):381 - 389
    Cited by:  Papers (85)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (816 KB)

    Low-rate vector quantizers are designed and simulated for highly correlated Gauss-Markov sources and the resulting performance is compared with Arnstein's optimized predictive quantizer and with Huang and Schultheiss' optimized transform coder. Two implementations of vector quantizers are considered: full search vector quantizers-which are optimal but require large codebook searches-and tree searc... 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