IEEE Transactions on Communications

Volume 30 Issue 5  Part 2 • May 1982

This issue contains several parts.Go to:  Part 1

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Displaying Results 1 - 25 of 26

Publication Year: 1982, Page(s): 0
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• Performance Analysis of Hybrid Switching Concepts for Integrated Voice/Data Communications

Publication Year: 1982, Page(s):1073 - 1087
Cited by:  Papers (16)
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This paper describes and evaluates variations of a generic hybrid switching concept for integrated voice and data communications. Concepts examined include the Slotted Envelope NETwork approach, the enhanced hybrid (SENET) with time assignment hybrid, and the variable length frame/packet approach. Primary criteria used to evaluate the concepts are transmission throughput efficiency and delay versu... View full abstract»

• Theoretical Performance of Entropy-Encoded DPCM

Publication Year: 1982, Page(s):1088 - 1095
Cited by:  Papers (10)
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In this paper the authors derive simple approximate formulas for the performance of entropy-encoded DPCM for a Gaussian random process and a frequency-weighted mean-square distortion measure. Using these results they compare the performance of DPCM to the information theoretic rate-distortion bound. They study the effect on the performance of DPCM of the spectrum of the input process, the frequenc... View full abstract»

• Partially Coherent Detection of Digital Full Response Continuous Phase Modulated Signals

Publication Year: 1982, Page(s):1096 - 1117
Cited by:  Papers (29)
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Recently bandwidth efficient constant envelope digital modulation schemes have been shown also to be power efficient, if detected coherently. In this paper the performance of such systems is analyzed for an optimum noncoherent or partially coherent detector, at large signal-to-noise ratios. The considered schemes are M-ary with arbitrary pulse shaping over one symbol interval (full response). The ... View full abstract»

• A Repeater Fault Locator Using a Correlation Technique for a Submarine Coaxial Cable System

Publication Year: 1982, Page(s):1117 - 1124
Cited by:  Papers (3)  |  Patents (1)
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This paper introduces a correlation technique in order to accurately measure intermodulation products from repeaters within a short period of time. A pair of PN sequences, whose cross-correlation function has a zero sidelobe has been designed to reduce interference by other products, and to obtain the necessary signal-to-noise ratio (more than 50 dB). As an example, design objectives and results f... View full abstract»

• The Design and Implementation of Unequal Error-Correcting Coding Systems

Publication Year: 1982, Page(s):1125 - 1135
Cited by:  Papers (5)
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The theoretical basis for using the mean-square error criterion in channel coding systems has been established previously. Such a criterion leads to an unequal error-correcting system. This paper describes the design methods for translating that theory into practice. It also presents some new results concerning the performance of these types of systems. The relationship of the mean-square system t... View full abstract»

• Verification of HDLC

Publication Year: 1982, Page(s):1136 - 1142
Cited by:  Papers (7)
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A version of the standard high level data link control protocol has been verified as an experiment with an automated verification system. This paper tries to answer questions such as: How can HDLC and its properties be represented? To what extent can they be proved? What are the main obstacles in verifying protocols like HDLC? View full abstract»

• Packet Satellite System with Multiuplinks and Priority Discipline

Publication Year: 1982, Page(s):1143 - 1152
Cited by:  Papers (7)
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The performance of a packet satellite system with multiple uplink channels using priority service discipline for successful packets on the uplinks is analyzed in this paper. The satellite is assumed to provide either no on-board storage or an infinite buffer for successful packets on the uplinks. The delay-throughput characteristics for each priority as well as the entire system have been obtained... View full abstract»

• Channels that Cooperatively Service a Data Stream and Voice Messages

Publication Year: 1982, Page(s):1153 - 1162
Cited by:  Papers (58)
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This paper presents an analysis of the performance of a special type of voice-data queueing system. The system consists of an integrated circuit-and packet-switched multiplexer resembling that found in the SENET network. A fluid-flow approximation for the data component is introduced to ease study of the voice loss rate and data packet waiting times. In this paper it is shown that very long data q... View full abstract»

• An Analysis of a TDMA Channel Using Stop-and-Wait, Block, and Select-and-Repeat ARQ Error Control

Publication Year: 1982, Page(s):1162 - 1173
Cited by:  Papers (27)
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In this paper, the multiaccess broadcast communication channel operating under a TDMA control discipline and employing an ARQ scheme is examined. The generating function of the message delay distribution is derived. The effects of nonzero bit error rates on multipacket messages under several stop-and-wait and block ARQ systems are incorporated. Numerical results for the steady-state mean and varia... View full abstract»

• Stability Conditions for DPCM Coders

Publication Year: 1982, Page(s):1174 - 1184
Cited by:  Papers (12)
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Differential pulse code modulation (DPCM) systems, used for encoding signals, are recursive and exhibit instability under certain conditions. In this paper, sufficient conditions for asymptotic stability of multidimensional DPCM systems are obtained both in the signal domain and the transform domain. In the case of instability, certain kinds of limit cycles, necessary conditions for their suppress... View full abstract»

Publication Year: 1982, Page(s):1184 - 1197
Cited by:  Papers (28)
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This paper compares the performance of different digital radio techniques in the presence of multipath fading. The measure used is the expected fraction of time, conditioned on the occurrence of a fading event, that the eye pattern at the receiver detector is closed. This measure is plotted against spectral efficiency for various types of modulation and for various forms of carrier recovery, timin... View full abstract»

• A New Approach to a Reliable Time Multiplexed Switch

Publication Year: 1982, Page(s):1198 - 1199
Cited by:  Papers (1)  |  Patents (1)
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Conventional designs for the time-multiplexed space-division switch used in PCM switching networks employ spatial redundancy (duplication) to assure adequate reliability. An alternative technique is described which employs a combination of coding redundancy and holographic temporal scattering to achieve reliability without duplication. View full abstract»

• Calculating Digital FM Spectra by Means of Autocorrelation

Publication Year: 1982, Page(s):1199 - 1208
Cited by:  Papers (19)
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In sharp contrast to the task of calculating the power spectrum for a general digital FM scheme, the autocorrelation can easily be obtained. By considering a class of FM schemes having a time-limited autocorrelation function, truncation is avoided and, applying a Fourier transformation, power spectral densities are easily obtained. A method is applied taking these properties into account. Thus, a ... View full abstract»

• An Error Correcting Rule Using Memory for Simple ALOHA Channels

Publication Year: 1982, Page(s):1208 - 1212
Cited by:  Papers (3)
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The performance of a simple memory-repeat-request (MRQ) algorithm for simple ALOHA channels is investigated. The unique feature of the algorithm is that the receiver constructs a correct packet by using the stored undamaged parts of the packets received. Analytical and computer simulation results are presented. View full abstract»

• High-Speed Digital and Analog Parallel Transmission Technique Over Single Telephone Channel

Publication Year: 1982, Page(s):1213 - 1218
Cited by:  Papers (4)  |  Patents (18)
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A new technique for parallel transmission of digital and analog signals over a single telephone channel is presented. The modulation scheme treated in this paper is quadrature amplitude modulation, wherein the digital and analog information are mapped separately as in phase and quadrature components. New decision directed schemes which are applicable to parallel transmission are derived by using a... View full abstract»

• Regenerative Self-Steering Array Combiners

Publication Year: 1982, Page(s):1218 - 1223
Cited by:  Papers (1)
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The authors discuss several designs for self-steering array combiners together with a simple frequency-offset tagging method which permits locking of combiner to one of several cochannel but spatially separate signals. The combiners use the output signal as a reference for extraction of phase information from each individual element-signal, thereby utilizing the full transmitted signal for element... View full abstract»

• PN Spread-Spectrum Signaling Through a Nonlinear Satellite Channel Disturbed by Interference and Noise

Publication Year: 1982, Page(s):1223 - 1233
Cited by:  Papers (2)
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This paper presents the results of the modeling and analysis of the bit error probability performance of pseudonoise (PN) spread-spectrum satellite communication systems subject to the worst case continuous wave (CW) tone interference. The mathematical model for the band-limiter nonlinear satellite repeater is formulated and the bit error probability is evaluated using classical moment techniques.... View full abstract»

• Intermodulation Analysis of FDMA Satellite Systems Employing Compensated and Uncompensated TWT's

Publication Year: 1982, Page(s):1233 - 1242
Cited by:  Papers (27)
| | PDF (840 KB)

In a frequency-division multiple-access (FDMA) satellite communication system, the output power of the TWT (or FET) amplifier is backed from saturation to reduce the intermodulation distortion caused by AM/AM and AM/PM nonlinearities. The required amount of backoff can be considerable, wasting valuable satellite power, unless some scheme is used to compensate for these nonlinearities. A comparativ... View full abstract»

• Outline of a Multiple-Access Communication Network Based on Adaptive Arrays

Publication Year: 1982, Page(s):1242 - 1248
Cited by:  Papers (2)
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This paper proposes a single-frequency communication system consisting of K mobile users simultaneously communicating with a central station equipped with a computationally adapted array consisting of n≥K antennas. The array employs K sets of n weights to segregate the signals received from the K users. The weights are determined by direct computati... View full abstract»

• Zero-Crossing Analysis of FM Threshold

Publication Year: 1982, Page(s):1249 - 1254
Cited by:  Papers (1)
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The idea of zero-crossing FM detection' has Stumpers (1948) been extended to analyze the phenomena of FM threshold. The position and number of zero-crossings is used to derive various formulas for calculation of noise power due to clicks in the presence of narrow-band Gaussian noise. A two-state Markov model of the zero-crossing model for clicks' is given. View full abstract»

• Adaptivity Versus Tree Searching in DPCM

Publication Year: 1982, Page(s):1254 - 1259
Cited by:  Papers (10)
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The interaction is studied between the effects of tree searching and predictor and quantizer adaptation in a differential pulse-code modulation (DPCM) speech digitizer. The maximum entropy method computes a new source model every 8 ms, and a variety of strategies are used to adapt the quantizer. Results are displayed in plots of local SNR versus time. It is found that the predictor, the quantizer,... View full abstract»

• An Application of the Barrett-Lampard Expansion to Obtain the Slope Characteristics of a Speech Signal

Publication Year: 1982, Page(s):1259 - 1262
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Many methods of speech waveform encoding utilize differential techniques for bandwidth compression. The channel bit rate of these systems is directly related to the slope characteristics of the speech signal. Employing well-known statistical characteristics of speech, this paper presents a derivation of the probability density function (pdf) for the differential slope of a speech signal and evalua... View full abstract»

• Bandwidth Limitations on Noiseless Optical Channel Capacity

Publication Year: 1982, Page(s):1262 - 1264
Cited by:  Papers (22)
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Even in noiseless optical channels one must take into account the fact that the time resolution available is finite. An optimization scheme under the constraint of a given information rate (in nats/second) and minimum time-slot resolution is presented. It is shown that system efficiencies in excess of tens of nats/phonon will be extremely difficult to achieve due to fundamental time resolution lim... View full abstract»

• Correction to the Forthcoming Special Issues List in the March Issue

Publication Year: 1982, Page(s): 1264
| | PDF (53 KB)

First Page of the Article
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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.

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Meet Our Editors

Editor-in-Chief
Naofal Al-Dhahir
University of Texas at Dallas