IEEE Transactions on Communications

Volume 22 Issue 8 • August 1974

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Displaying Results 1 - 25 of 27
  • [Front cover and table of contents]

    Publication Year: 1974, Page(s): 0
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  • Phase-Locked Loop Pull-In Frequency

    Publication Year: 1974, Page(s):1005 - 1013
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (777 KB)

    A computerized procedure for obtaining the pull-in frequency of a phase-locked loop is described. The procedure, which consists of solving for the limit cycle of the out-of-lock loop and finding the frequency offset below which no solution exists, is quite general with respect to phase detector function and loop filter. It is applied in this study to the case of a second-order loop with a sinusoid... View full abstract»

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  • Theory of an Adaptive Quantizer

    Publication Year: 1974, Page(s):1037 - 1045
    Cited by:  Papers (70)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (918 KB)

    In an adaptive quantizer that has been used for speech encoding, the entire amplitude range expands or contracts by a multiplicative constant after each input sample. The constant Midepends only on the magnitude of the current quantizer output. Assuming independent identically distributed input samples, we show that the sequence of quantizer ranges is a stochastically stable process. Fu... View full abstract»

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  • Signal Detection in the Presence of Atmospheric Noise in Tropics

    Publication Year: 1974, Page(s):1055 - 1063
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (833 KB)

    A new model of HF atmospheric radio noise (ARN) that leads to observed probability distributions of noise is briefly described. The new ARN model is then applied to the detection of known signals in the presence of noise to determine optimal receiver structure for ARN. Probabilities of errors for a linear matched filter and nonlinear (-1/log) and inverted(log)^{2}correlator receivers an... View full abstract»

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  • Optimum Frame Synchronization for Biorthogonally Coded Data

    Publication Year: 1974, Page(s):1130 - 1133
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (461 KB)

    The optimum procedure for locating a sync word periodically inserted in uncoded binary data received over a binary symmetric channel is based on the Hamming or bit distance metric. This concise paper addresses the corresponding frame-sync problem for biorthogonally coded data transmitted over the additive white Gaussian noise (AWGN) channel. For conceptual convenience, thek-bit words fr... View full abstract»

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  • Optimum Bandwidth Compression for a Class of Correlative Multilevel Coding

    Publication Year: 1974, Page(s):1140 - 1145
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (335 KB)

    This paper presents a class of digital transformations which generaten-level sequences having an autocorrelation function which remains nonzero throughout its domain in order to insure a narrow spectrum. In addition, any transformation of the class attains maximum redundancy and can be implemented by a simple one-bit memory stochastic machine. Most importantly, the autocorrelation funct... View full abstract»

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  • Correction to "Probability of Error in Binary Communication Systems with Casual Band-Limiting Filters--Part I: Nonreturn-to-Zero Signal and Part II: Split-Phase Signal"

    Publication Year: 1974, Page(s): 1146
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (109 KB)

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  • On the usefulness of group delay and/or phase delay parameters for low distortion transmission

    Publication Year: 1974, Page(s):1147 - 1148
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (211 KB)

    It is argued that transmission systems/filters, etc., design must be carried out basically in the time domain in terms of rise time, overshoot or undershoot of the instantaneous amplitude/ phaselfrequency specifications. No attempt should be made to define the group delay characteristics because it is neither sufficient, nor necessary. Group delay approximating functions and measurements should be... View full abstract»

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  • Comments on "Are Group Delay Time and/or Phase Delay Time Useful Parameters for Defining Low Distortion Transmission?"

    Publication Year: 1974, Page(s): 1148
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (131 KB)

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  • Correction to "Motion-Induced Noise in Electrode-Pair Extremely Low Frequency (ELF) Receiving Antennas"

    Publication Year: 1974, Page(s): 1154
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (81 KB)

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  • Book Reviews

    Publication Year: 1974, Page(s): 1155
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  • [Back cover]

    Publication Year: 1974, Page(s): 0
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  • The Theory of Operation of an Equal-Gain Predetection Regenerative Diversity Combiner with Rayleigh Fading Channels

    Publication Year: 1974, Page(s):1099 - 1106
    Cited by:  Papers (10)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (640 KB)

    The theory of operation of an equal-gain predetection diversity combiner employing the Granlund technique of utilizing a combination of feedback and feedforward is presented. It is shown that the time delays of the filters and the loop phase shifts uniquely determine the operating frequencies within the system. The random FM at the discriminator output is shown to be a weighted sum of that on the ... View full abstract»

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  • PCM-FDM: System Capability and Performance Improvement on Waveform Equalization and Synchronization

    Publication Year: 1974, Page(s):1149 - 1154
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (600 KB)

    To obtain wider waveform equalization range and higher synchronization accuracy, we have introduced: 1) a multilevel pilot-pulse equalization system and 2)an in-band in-phase pilot synchronization system into multilevel VSB-conversion PCM-FDM equipment. This equipment is used to transmit digital signals on existing analog lines. 1) Multilevel pilot pulses with a smaller number of levels than the i... View full abstract»

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  • Mop-Up Equalization of Certian AM-PM Distortion Effects in FDM-FM Transmission Systems

    Publication Year: 1974, Page(s):1146 - 1147
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    In frequency division multiplexing (FDM)-FM transmission systems, unequalized parabolic delay preceding a component with AM-PM conversion can be an important source of intermodulation distortion. This correspondence describes some manifestations of these distortion effects and indicates how the distortion can be reduced with cubic IF amplitude equalizers applied on a mop-up basis. View full abstract»

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  • The SNR Threshold in PPM Reception

    Publication Year: 1974, Page(s):1094 - 1098
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    The signal-to-noise-ratio (SNR) performance of a pulse-position-modulation (PPM) receiver is well understood when the input SNR exceeds the threshold, but below it the output SNR deteriorates on account of false pulses due to noise. The calculation of their effect, which determines the threshold, has been considered a difficult problem. However, the use of Rice's 1948 result concerning the rate of... View full abstract»

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  • Effect of Noisy Phase Reference on Coherent Detection of Offset-QPSK Signals

    Publication Year: 1974, Page(s):1046 - 1055
    Cited by:  Papers (37)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (960 KB)

    Imperfect carrier synchronization causes a performance loss for coherent phase-shift-keyed (PSK) communications. This detection loss is greater for quaternary signaling (QPSK) than for the binary case (BPSK). The use of an offset form of QPSK, also known as double-biphase modulation, is shown to yield a probability of bit error in detection that is equal to the average of the detection performance... View full abstract»

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  • Slant Transform Image Coding

    Publication Year: 1974, Page(s):1075 - 1093
    Cited by:  Papers (47)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2904 KB)

    A new unitary transform called the slant transform, specifically designed for image coding, has been developed. The transformation possesses a discrete sawtoothlike basis vector which efficiently represents linear brightness variations along an image line. A fast computational algorithm has been found for the transformation. The slant transformation has been utilized in several transform image-cod... View full abstract»

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  • Coherent and Noncoherent Detection CPFSK

    Publication Year: 1974, Page(s):1023 - 1036
    Cited by:  Papers (121)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1296 KB)

    Continuous phase frequency shift keying (CPFSK) is potentially an attractive modulation scheme for use on channels whose performance is limited by thermal noise. In this paper results for the performance available with CPFSK are given for coherent detection and noncoherent detection with arbitrary modulation indices and arbitrary observation intervals. This work serves two purposes. First, it prov... View full abstract»

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  • PCM Jitter Suppression by Scrambling

    Publication Year: 1974, Page(s):1114 - 1122
    Cited by:  Papers (11)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1080 KB)

    Jitter suppression in a chain of baseband PCM repeaters is studied. It is shown that a scrambler is very effective for systematic jitter suppression and that beyond 5 stages little additional suppression results. The probability of mark in the scrambler output converges to 0.5, independently of that in the input PCM signal. Experimental results confirm the analysis and show the ability of the scra... View full abstract»

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  • Multilevel Balanced Code with Redundant Digits

    Publication Year: 1974, Page(s):1136 - 1140
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    In this concise paper, several coding schemes are proposed for transmitting digital information over a cable with dc cutoff. The codes are composed of information digits and balance digits determined by the weight of the former. It is shown that the encoding and decoding circuits are quite simple, and that the dc component of the codes is negligibly small. Furthermore, the lowfrequency components ... View full abstract»

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  • Differential Encoding of Composite Color Television Signals Using Chrominance-Corrected Prediction

    Publication Year: 1974, Page(s):1106 - 1113
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1048 KB)

    A digital coding technique which interfaces efficiently with composite color signals is clearly desirable for connections formed from a chain of analog and digital transmission links. This paper reviews a number of such techniques, and develops a predictive encoding algorithm, termed chrominance-corrected prediction, which is efficiently matched to the nature of the composite signal, and which avo... View full abstract»

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  • Adaptive Equalization of the Slow Fading Channel

    Publication Year: 1974, Page(s):1064 - 1075
    Cited by:  Papers (51)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1352 KB)

    This paper considers equalization of the slow fading channel for a serial data transmission application. Linear and decision-feedback adaptive equalization techniques are contrasted. The error propagation effect in decision-feedback equalizers is analyzed by a Markov process model. The error probability magnification is computed for both fixed and fading channels and for both binary and quaternary... View full abstract»

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  • Analysis of Channel Utilization in Traffic Concentrators

    Publication Year: 1974, Page(s):1122 - 1129
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    The behavior of line concentrators in a data communication system has been analyzed for different channel allocation strategies. The users (terminals) are divided into classes according to their transmission rate requirements. The different bit rate classes (BRC) can be separated by dividing the network into subnets or, alternatively, they can share one concentrator which forms outgoing channels f... View full abstract»

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  • The Subsequence Weight Distribution of Summed Maximum Length Digital Sequences

    Publication Year: 1974, Page(s):997 - 1004
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (736 KB)

    The statistics of the weight distribution of subsequences of digital sequences called hybrid-sum sequences, formed from the modulo-two sum of several maximum length sequences, are analyzed. The results indicate that a relation exists between the statistics of the weight distribution of the subsequences and the characteristic polynomials of the component maximum length sequences. An analysis proced... 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