IEEE Transactions on Communication Technology

Includes the top 50 most frequently accessed documents for this publication according to the usage statistics for the month of

  • Space DIversity on Line-of-Sight Microwave Systems

    Publication Year: 1968, Page(s):119 - 133
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2611 KB)

    Deep fading on line-of-sight microwave paths is usually a result of multipath interference phenomena. Frequency diversity has been the most common method of protecting against such fading. In the past few years, vertical space diversity has also come into use. This paper discusses its characteristics, methods of determining spacings, and describes some results achieved. It is concluded that vertic... View full abstract»

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  • Data Transmission by Frequency-Division Multiplexing Using the Discrete Fourier Transform

    Publication Year: 1971, Page(s):628 - 634
    Cited by:  Papers (1127)  |  Patents (175)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (621 KB)

    The Fourier transform data communication system is a realization of frequency-division multiplexing (FDM) in which discrete Fourier transforms are computed as part of the modulation and demodulation processes. In addition to eliminating the bunks of subcarrier oscillators and coherent demodulators usually required in FDM systems, a completely digital implementation can be built around a special-pu... View full abstract»

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  • The Divergence and Bhattacharyya Distance Measures in Signal Selection

    Publication Year: 1967, Page(s):52 - 60
    Cited by:  Papers (751)  |  Patents (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (932 KB)

    Minimization of the error probability to determine optimum signals is often difficult to carry out. Consequently, several suboptimum performance measures that are easier than the error probability to evaluate and manipulate have been studied. In this partly tutorial paper, we compare the properties of an often used measure, the divergence, with a new measure that we have called the Bhattacharyya d... View full abstract»

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  • An Adaptive Decision Feedback Equalizer

    Publication Year: 1971, Page(s):281 - 293
    Cited by:  Papers (82)  |  Patents (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1272 KB)

    An adaptive decision feedback equalizer to detect digital information transmitted by pulse-amplitude modulation (PAM) through a noisy dispersive linear channel is described, and its performance through several channels is evaluated by means of analysis, computer simulation, and hardware simulation. For the channels considered, the performance of both the fixed and the adaptive decision feedback eq... View full abstract»

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  • Convolutional Codes and Their Performance in Communication Systems

    Publication Year: 1971, Page(s):751 - 772
    Cited by:  Papers (547)  |  Patents (31)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2234 KB)

    This tutorial paper begins with an elementary presentation of the fundamental properties and structure of convolutional codes and proceeds with the development of the maximum likelihood decoder. The powerful tool of generating function analysis is demonstrated to yield for arbitrary codes both the distance properties and upper bounds on the bit error probability for communication over any memoryle... View full abstract»

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  • Demodulation of Single-Sideband Signals Via Envelope Detection

    Publication Year: 1966, Page(s):22 - 30
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (920 KB)

    Present day single-sideband (SSB) technology is based on synchronous demodulation, with implicit stringent stability requirements. This factor has deterred the use of SSB in some services in which it might be advantageous. There are two general ways to mitigate the stability problem: by transmitting a pilot carrier to synchronize a local oscillator, and by extracting the information signal from th... View full abstract»

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  • Viterbi Decoding for Satellite and Space Communication

    Publication Year: 1971, Page(s):835 - 848
    Cited by:  Papers (245)  |  Patents (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1291 KB)

    Convolutional coding and Viterbi decoding, along with binary phase-shift keyed modulation, is presented as an efficient system for reliable communication on power limited satellite and space channels. Performance results, obtained theoretically and through computer simulation, are given for optimum short constraint length codes for a range of code constraint lengths and code rates. System efficien... View full abstract»

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  • Performance of an Efficient Parallel Data Transmission System

    Publication Year: 1967, Page(s):805 - 811
    Cited by:  Papers (374)  |  Patents (60)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (658 KB)

    A parallel quadrature AM data transmission system may be implemented with a number of overlapping channels, each carrying a signaling rateb, spacedb/2apart in frequency. When a large number of channels are used, the system allows transmission speeds very close to the Nyquist rate, with little sensitivity to delay and amplitude distortion of the transmission medium. The receiv... View full abstract»

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  • Dither Signals and Their Effect on Quantization Noise

    Publication Year: 1964, Page(s):162 - 165
    Cited by:  Papers (207)  |  Patents (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (354 KB)

    In this paper, the conditions a dither signal must meet so that the quantizer noise can be considered independent of the signal are derived for a quantizer having a finite number of levels. An infinite class of dither signals which satisfy these conditions is given. It is seen that the most useful member of this class is one whose probability density function is uniformly distributed over a quanti... View full abstract»

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  • A Theoretical Study of Performance of an Orthogonal Multiplexing Data Transmission Scheme

    Publication Year: 1968, Page(s):529 - 540
    Cited by:  Papers (147)  |  Patents (37)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (997 KB)

    This paper presents a theoretical analysis of the performance of an orthogonal multiplexing data transmission scheme (parallel transmission scheme) subject to a number of degrading factors normally encountered by a practical operating system. The factors considered jointly are sampling time error, carrier phase offset, and nonideal phase characteristics of transmitting and receiving filters. Perfo... View full abstract»

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  • Burst-Correcting Codes for the Classic Bursty Channel

    Publication Year: 1971, Page(s):772 - 781
    Cited by:  Papers (114)  |  Patents (36)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1222 KB)

    The purpose of this paper is to organize and clarify the work of the past decade on burst-correcting codes. Our method is, first, to define an idealized model, called the classic bursty channel, toward which most burst-correcting schemes are explicitly or implicitly aimed; next, to bound the best possible performance on this channel; and, finally, to exhibit classes of schemes which are asymptotic... View full abstract»

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  • Experimental Confirmation of an HF Channel Model

    Publication Year: 1970, Page(s):792 - 803
    Cited by:  Papers (134)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1230 KB)

    Specially designed HF ionospheric propagation measurements were made and analyzed to confirm the validity and bandwidth limitations of a proposed stationary HF ionospheric channel model. In the model, the input (transmitted) signal feeds an ideal delay line and is delivered at several taps with adjustable delays, one for each resolvable ionospheric modal component. Each delayed signal is modulated... View full abstract»

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  • Phase-Ambiguity Resolution in a Four-Phase PSK Communications System

    Publication Year: 1971, Page(s):1200 - 1210
    Cited by:  Papers (12)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1004 KB)

    The constraints of digital satellite communications systems have led to the derivation of a method for resolving the problem of recovered-carrier phase ambiguity in a coherent fourphase phase-shift-keying (PSK) communications system while simultaneously providing synchronization information. This method is described for the general case and a general implementation is given. In addition, implement... View full abstract»

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  • The Probability of Error Due to Intersymbol Interference and Gaussian Noise in Digital Communication Systems

    Publication Year: 1971, Page(s):113 - 119
    Cited by:  Papers (100)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    The error rate or the probability of error is an important parameter in the design of digital communication systems. In this paper a Gram-Charlier expansion is used to compute the error rate in the presence of intersymbol interference and additive Gaussian noise. The method presented is very useful for numerical computations. We also present expressions for the truncation errors. Rigorous proofs a... View full abstract»

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  • Correlative Digital Communication Techniques

    Publication Year: 1964, Page(s):128 - 135
    Cited by:  Papers (77)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (807 KB)

    A new method for the transmission of intelligence by means of a signal having certain correlation properties has been evolved. The theoretical and practical aspects of this concept are presented. An important advantage of these techniques is that for a fixed performance criteria, considerably higher speeds are possible compared to the presently known methods. In addition, the implementation is sim... View full abstract»

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  • Matched Filters for Rectangular, Raised Cosine, and Half Sine Wave Signals

    Publication Year: 1971, Page(s):369 - 371
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    Practical constructions of matched filters for the typical waveshape of pulsed signals are shown. Each filter consists of a prefilter, delay line, and attenuator. The degraduation of output signal-to-noise ratio (SNR) due to loss factor in each prefilter is calculated. View full abstract»

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  • A Variable-Step-Size Robust Delta Modulator

    Publication Year: 1971, Page(s):1033 - 1044
    Cited by:  Papers (37)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1576 KB)

    An optimum adaptive delta modulator-demodulator configuration is derived. This device utilizes two past samples to obtain a step size which minimizes the mean square error for a Markov Gaussian source. The optimum system is compared using computer simulations with the linear delta modulator and an enhanced Abate delta modulator. In addition the performance is compared to the rate distortion bound ... View full abstract»

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  • Nonlinear Phase Shift in Traveling-Wave Tubes as Applied to Multiple Access Communications Satellites

    Publication Year: 1970, Page(s):37 - 48
    Cited by:  Papers (47)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1709 KB)

    A modern communications satellite typically amplifies many frequency-modulated radio-frequency carriers in a single common amplifier. The nonlinear phase versus input power behavior of traveling-wave tubes (TWT) and its impact on intermodulation noise and intelligible crosstalk is treated. A theoretical model is presented, which allows calculation of the multicarrier performance of the TWT, and an... View full abstract»

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  • Subsurface Electromagnetic Telecommunication - A Review

    Publication Year: 1971, Page(s):1217 - 1228
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1127 KB)

    We present a review of the telecommunication possibilities for terminals that are buried in the earth or submerged in the sea. The important role of the operating frequency is stressed. Without being comprehensive, we discuss the relevance of the large number of theoretical papers on electromagnetic waves in conducting media. Our most important recommendation is that the highfrequency band be give... View full abstract»

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  • Topology and Transmission Rate Considerations in the Design of Centralized Computer-Communication Networks

    Publication Year: 1971, Page(s):339 - 344
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (721 KB)

    The important parameters of network topology and data transmission rate are examined in the light of their effect on the design of centralized computer-communication networks. Existing algorithms for the design of centralized nets are reviewed and restrictions on their use are noted. Various methods for formulating performance constraints are presented and their suitability in the light of availab... View full abstract»

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  • Testing a Sample Population for the Rayleigh Distribution

    Publication Year: 1971, Page(s):99 - 100
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (202 KB)

    The existence of a Kolmogorov-Smirnov test for goodness of fit to a Rayleigh distribution is shown. The test does not require that the variance of the hypothesized distribution be known. View full abstract»

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  • Optimal Design of One-Way and Two-Way Coherent Communication Links

    Publication Year: 1966, Page(s):418 - 431
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1212 KB)

    This paper is concerned with the optimal design of one-way and two-way communication systems which are of greatest interest in space applications. A two-way communication system is defined to be one composed of two radio links or channels, viz., an up-link channel and a down-link channel. The down-link RF carrier is derived from the carrier tracking loop located in the uplink receiver. Transmissio... View full abstract»

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  • Transmission of Multiplexed PAM Signals Over Multiple Channel and Diversity Systems

    Publication Year: 1970, Page(s):520 - 526
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (679 KB)

    It is well known that the optimum receiver for pulse-amplitude-modulated (PAM) signals, transmitted over a single channel, consists of a cascade of continuous and transversal filters. It is shown that an extended structure of this type is also optimum for the completely general case ofMmultiplexed PAM signals transmitted over random-time and frequency-dispersive multichannel systems wit... View full abstract»

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  • The Effect of Gaussian Error in Maximal Ratio Combiners

    Publication Year: 1971, Page(s):492 - 500
    Cited by:  Papers (154)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (658 KB)

    In a fading channel, maximal ratio diversity combilling improves the average signal-to-noise ratio over thatof a single branch in proportion to the number of diversity branches combined. However, its main advantage is the reduction of the probability of deep fades. The effect of Gaussian errors in the combiner weighting factors on the probability distribution of the output signal-to-noise ratio is... View full abstract»

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  • The Design of a Pulse-Position Modulated Optical Communication System

    Publication Year: 1969, Page(s):670 - 676
    Cited by:  Papers (34)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (744 KB)

    In recent literature the advantages of an idealized narrow-width pulse-position modulated (PPM) optical communication system, using coherent sources and direct photodetection, have been shown. In this paper the practical design of such an operating PPM link is considered. System performance in terms of error probabilities and information rates is derived in terms of key parameters, such as power l... View full abstract»

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  • Cycle Slipping in a First-Order Phase-Locked Loop

    Publication Year: 1968, Page(s):255 - 260
    Cited by:  Papers (32)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (582 KB)

    In this paper a model for a carrier plus narrowband noise is presented, and with its aid the expected number of cycle slipping events per second for a first-order phase-locked loop (PLL) driven by a narrowband noise corrupted carrier, both with and without a limiter, is determined. Experimental data are presented which indicate the extreme accuracy of the results obtained with the use of this mode... View full abstract»

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  • Performance of Optimum and Suboptimum Synchronizers

    Publication Year: 1969, Page(s):380 - 389
    Cited by:  Papers (33)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (922 KB)

    The optimum (maximum-likelihood) synchronizer for extracting bit synchronization directly from a binary data stream is presented along with some simple suboptimum synchronizers that perform almost as well. The manner in which the performances of these systems depend on the pertinent system parameters as determined by a combined program of analysis, simulation, and laboratory experimentation are re... View full abstract»

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  • An Approximate Method for Computing Blocking Probability in Switching Networks

    Publication Year: 1966, Page(s):85 - 93
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (683 KB)

    This paper describes an approximate method for evaluating the blocking probability of a switching network. The model used is C. Y. Lee's probability linear graph. By changing the structure of the graph between a pair of adjacent stages in two ways, it is possible to obtain upper and lower bounds for the blocking probability. The calculation of the bounds is performed on graphs which have a simpler... View full abstract»

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  • The Spectrum of a High-Index FM Waveform: Woodward's Theorem Revisited

    Publication Year: 1969, Page(s):201 - 208
    Cited by:  Papers (28)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (740 KB)

    Woodward's theorem asserts that the spectrum of a high-index frequency-modulated (FM) waveform is approximately the probability distribution of its instantaneous frequency, i.e., the univariate distribution of the modulating wave shifted by the carrier frequency. A new proof is presented which for the first time includes an upper bound on the error of this approximation and thus shows under what c... View full abstract»

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  • Frequency Modulation Using Digital Filtering Techniques

    Publication Year: 1970, Page(s):632 - 637
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (603 KB)

    A simple unstable second-order digital filter with one variable multiplier can provide a source of frequency-modulated signals. This modulator is readily time-shared and should prove attractive when a large number of transmitters are required. A system consisting of a multiple installation of identical binary frequency-shift keying data transmitters is described and analyzed. A refinement which to... View full abstract»

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  • The Development of Ocean-Cable Plows

    Publication Year: 1971, Page(s):1233 - 1241
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1162 KB)

    Transatlantic communication cables have been in use for more than a century. Studies indicate that more than half of the failures in telegraph cables in the past were due to fishing activity. Since 1956 high-capacity telephone cables have largely replaced telegraph cables. In these new cables 95 percent of all breaks have been due to fishing trawlers. To protect against this hazard a plow was deve... View full abstract»

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  • Implementation of Reed-Solomon Erasure-Correcting Decoder for Hybrid Coding Scheme

    Publication Year: 1971, Page(s):543 - 546
    Cited by:  Papers (2)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (379 KB)

    Implementation of the algebraic section of a relatively simple sequential-algebraic error-correcting scheme for very noisy channels is detailed, and its complexity evaluated. Since one of the properties of this hybrid is that the sequential portion can be any standard sequential decoder, the description here is sufficient to specify the modifications which must be performed on a convolutional-enco... View full abstract»

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  • The Effect of Phase Jitter on the Performance of a First-Order Phase-Locked Loop

    Publication Year: 1970, Page(s):74 - 76
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (351 KB)

    A filterless phase-locked loop is considered with an arbitrary periodic phase comparator. The loop has a jittered input and is perturbed by thermal noise. Under such conditions the loop skips cycles from time to time. A study is made of the statistical behavior of the loop and emphasis is placed on the determination of the average time of skipping cycles. This problem is related to the first passa... View full abstract»

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  • A Low-Speed Magnetic Memory Device

    Publication Year: 1965, Page(s):65 - 70
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (724 KB)

    Computer and switching control systems in use today typically require some type of memory for system operation. The memory, or data store for the system, serves to hold data in storage until it is needed by a cycle of system operation. Relays, flip-flops, punched cards, magnetic tapes, discs, and drums, ferrite cores, and matrices represent some of the devices available for this purpose. This pape... View full abstract»

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  • Nonlinear Analysis of an Absolute Value Type of an Early-Late Gate Bit Synchronizer

    Publication Year: 1970, Page(s):589 - 596
    Cited by:  Papers (23)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (492 KB)

    The steady-state phase noise performance of an absolute value type of early-late gate bit synchronizer is developed using the Fokker-Planck method. The results are compared with the performance of two other commonly used bit synchronizer circuit topologies on the basis of either 1) equal equivalent signal to noise in the loop bandwidth in the linear region, or 2) equal loop bandwidth at each input... View full abstract»

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  • Carrier Acquisition for Coherent Demodulation of Pulse-Amplitude Modulation

    Publication Year: 1970, Page(s):353 - 360
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (734 KB)

    Phase recovery in vestigial sideband (VSB) data transmission is discussed. Examining a particular aspect of this broad area, attention is focused on the time required to recover carrier phase in order to achieve a satisfactory error rate. We derive the acquisition time for simple models. Our results are exhibited graphically, relating pertinent system parameters. These results indicate that while ... View full abstract»

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  • Noise Bandwidth of Common Filters

    Publication Year: 1970, Page(s):828 - 830
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (291 KB)

    The noise bandwidth BNof Butterworth, Bessel, and Chebyshev filters is tabulated. The Butterworth filter is shown to have the minimum BNto 3-dB bandwidth ratio for any secondorder filter. It is proven that BNis invariant when a low-pass to bandpass transformation is made. An error is corrected in recent tables of Chebyshev filters. View full abstract»

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  • Adaptive Variable-Length Coding for Efficient Compression of Spacecraft Television Data

    Publication Year: 1971, Page(s):889 - 897
    Cited by:  Papers (59)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (941 KB)

    An adaptive variable length coding system is presented. Although developed primarily for the proposed Grand Tour missions, many features of this system clearly indicate a much wider applicability. Using sample to sample prediction, the coding system produces output rates within 0.25 bit/picture element (pixel) of the onedimensional difference entropy for entropy values ranging from 0 to 8 bit/pixe... View full abstract»

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  • A New Method for Calculating Probabilities of Errors Due to Impulsive Noise

    Publication Year: 1969, Page(s):368 - 379
    Cited by:  Papers (32)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1256 KB)

    A new approach to the prediction of error rates in digital data transmission systems when the dominant source of errors is given by noise bursts, each having a fiat spectrum across the band of interest, is described. Specifically, a hierarchy of phaseaveraged conditional error probabilities calledkth receiver impulse characteristics (RIC) are defined, which depend only on the receiver's... View full abstract»

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  • Self-Similar Error Clusters in Communication Systems and the Concept of Conditional Stationarity

    Publication Year: 1965, Page(s):71 - 90
    Cited by:  Papers (90)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2231 KB)

    The purpose of this paper is twofold. From the viewpoint of communications engineering, it presents a model of certain random perturbations that appear to come in clusters, or bursts. This will be achieved by introducing the concept of "self-similar stochastic point process in continuous time." The resulting mechanism presents fascinating peculiarities from the mathematical viewpoint. In order to ... View full abstract»

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  • The Kalman Filter for the Equalization of a Digital Communications Channel

    Publication Year: 1971, Page(s):1137 - 1141
    Cited by:  Papers (77)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    Consideration is given to the use of the discrete Kalman filter as an equalizer for digital binary transmission in the presence of noise and intersymbol interference. When the channel is modeled as ann-tap transversal filter, the Kalman filter assumes a similar form with "feed forward and feedback." It is shown how the Kalman filter can be used to estimate both the tap weights and the b... View full abstract»

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  • Quantizing for Noisy Channels

    Publication Year: 1969, Page(s):291 - 302
    Cited by:  Papers (97)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (955 KB)

    We consider the transmission of numerical data over a noisy channel. Two sources of error exist. The first is the quantizer where the input data is mapped into a finite set of rational numbers and the second is the channel which includes the encoder, transmitter, transmission medium, receiver, and decoder. For any given probability density on the input data and any given channel matrix, we determi... View full abstract»

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  • Techniques for Designing Finite-Duration Impulse-Response Digital Filters

    Publication Year: 1971, Page(s):188 - 195
    Cited by:  Papers (47)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (719 KB)

    Several new techniques for designing finite-duration impulse-response digital filters have become available in the past few years. The motivation behind three design techniques that have been proposed are reviewed here, and the resulting designs are compared with respect to filter characteristics, ease of design, and methods of realization. The design techniques to be discussed include window, fre... View full abstract»

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  • Combiner Performance Using Narrow-Band Noise Filtering and Enhanced Squelch

    Publication Year: 1968, Page(s):451 - 455
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (478 KB)

    The use of "narrow-band" noise filters in the combiner control circuits of a quadruple-diversity post-detection combiner was found to reduce the average bit-error rate by a factor of 4.6; while the median output signal-to-noise ratio was increased by 2 dB. The use of an "enhanced-squelch" control of the postdetection combiner increased the output voice-channel signal-to-noise ratio by 3 dB, and ef... View full abstract»

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  • The Effect of Loop Stress on the Performance of Phase-Coherent Communication Systems

    Publication Year: 1970, Page(s):569 - 588
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (962 KB)

    In phase-coherent communication systems which use phase-locked loops to provide synchronization of the data detector, the communications engineer is frequently faced with the problem of determining the effects which noisy timing has upon detection efficiency. This paper is concerned with determining these effects when second-order phase-locked loops, operating in the presence of frequency detuning... View full abstract»

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  • Some Techniques for the Instantaneous Real-Time Measurement of Multipath and Doppler Spread

    Publication Year: 1965, Page(s):285 - 292
    Cited by:  Papers (35)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (760 KB)

    The design optimization of digital communication systems using selectively fading transmission media such as HF and troposcatter requires knowledge of the selective fading characteristics of the media. A minimal characterization is provided by the gross channel parameters of multipath spread and Doppler spread. This paper presents several techniques which will allow the simultaneous measurement of... View full abstract»

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  • A Troposcatter Channel Model

    Publication Year: 1969, Page(s):130 - 137
    Cited by:  Papers (33)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (804 KB)

    Using some basic results in propagation theory, a single integral is derived which relates the channel delay power spectrum to the geometry and antenna patterns of the troposcatter link. Theoretical curves of delay power spectra and frequency correlation functions are presented for medium- and long-distance troposeatter links. View full abstract»

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  • Sequential decoding for efficient communication from deep space

    Publication Year: 1967, Page(s):492 - 501
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1052 KB)

    A system based on sequential decoding and utilizing binary phase-shift keying and 8-level quantized decisions is proposed for deep-space communication. Theoretical analyses augmented by a program of computer Simulation promise operation within 3-4 dB of the channel capacity of an infinite bandwidth additive white Gaussian noise channel. A low probability of erasure is achieved by the suggested use... View full abstract»

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  • A Feedforward Experiment Applied to an L-4 Carrier System Amplifier

    Publication Year: 1971, Page(s):320 - 325
    Cited by:  Papers (26)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (832 KB)

    As part of a test to determine its applicability to coaxial repeaters, a feedforward error-control system was applied to an L-4 coaxial system flat-gain amplifier operating in the frequency range of 0.5-20 MHz. The error amplifier was a duplicate to the main amplifier. With three test tones at 7.5 dBm output each applied within the last L-4 master group, modulation products in the uncompensated sy... View full abstract»

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  • Failure - Correction Decoding

    Publication Year: 1967, Page(s):23 - 31
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (887 KB)

    Failure-correction decoding (FCD) is a decoding method that improves the performance of error-correction block codes by using reliability estimates of the received digit decisions. The FCD logic producesFfailures by erasing theFdigits of a received code character that are most probably in error. Since the numberFis the code's erasure-correction capability, the deco... View full abstract»

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Aims & Scope

This Transactions ceased publication in 1971. The current retitled publication is  IEEE Transactions on Communications.

Full Aims & Scope