IRE Transactions on Communications Systems

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  • The Sum of Log-Normal Probability Distributions in Scatter Transmission Systems

    Publication Year: 1960, Page(s):57 - 67
    Cited by:  Papers (380)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (938 KB)

    The long-term fluctuation of transmission loss in scatter propagation systems has been found to have a logarithmicnormal distribution. In other words, the scatter loss in decibels has Gaussian statistical distribution. Therefore, in many important communication systems (e.g., FM), the noise power of a radio jump, or hop, has log-normal statistical distribution. In a multihop system, the noise powe... View full abstract»

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  • The Influence of Fading Spectrum on the Binary Error Probabilites of Incoherent and Differentially Coherent Matched Filter Recievers

    Publication Year: 1962, Page(s):160 - 168
    Cited by:  Papers (106)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (820 KB)

    Previous derivations of the influence of fading on the error probabilities of binary data transmission systems have assumed that the fading rate is so slow that fluctuations within a bit may be ignored. This slow fading assumption is removed in the present paper which derives general expressions for the binary error probabilities of incoherent and differentially coherent matched filter receivers e... View full abstract»

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  • Comparison of PSK vs FSK and PSK-AM vs FSK-AM Binary-Coded Transmission Systems

    Publication Year: 1960, Page(s):87 - 100
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1301 KB)

    The performance of phase shift keyed (PSK), frequency shift keyed (FSK), PSK amplitude modulation (PSK-AM), and FSK amplitude modulation (FSK-AM), systems are compared for binary coded transmission in the presence of additive white Gaussian noise. This performance is based on the relative probability of error, operating range, required system bandwidth, and system frequency instability. The import... View full abstract»

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  • Optimum Antenna Height for Ionospheric Scatter Communication

    Publication Year: 1960, Page(s):14 - 19
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (852 KB)

    Radiation patterns of elevated antennas over spherical earth for scatter propagation in the lower ionosphere incorporating refraction, parallax, spherical divergence, tropospheric defocusing, and near-horizon diffraction have been used to compute the height gain function resulting from raising and lowering symmetric transmitting and receiving antennas for a fixed path length. This height gain func... View full abstract»

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  • An Analog Computer for Finding an Optimum Route Through a Communication Network

    Publication Year: 1959, Page(s):37 - 42
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (541 KB)

    This paper describes an analog computer capable of solving a variety of communication network problems; in particular, the problem of finding an optimum route through an arbitrary network. For example, in routing a call through a communications network, it may be desirable to determine that path (or paths) containing the smallest number of switching centers-or again, if, in some predetermined sens... View full abstract»

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  • Effects of Impulse Noise on Digital Data Transmission

    Publication Year: 1961, Page(s):355 - 361
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (894 KB)

    This paper presents the basic characteristics of impulse noise and its effects on various types of binary data transmission systems. The sources and properties of such impulsive noise, in contrast to Gaussian noise, are discussed. A method is described for the experimental comparative evaluation of bit error rates in the presence of additive impulse noise. The method is shown to permit unique comp... View full abstract»

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  • Simple Methods for Designing Troposcatter Circuits

    Publication Year: 1960, Page(s):193 - 198
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (515 KB)

    As troposcatter circuits come more and more widely into use, there is a need for simple and reasonably accurate design methods for routine use, since the speed of obtaining a suitable design is sometimes of the utmost importance. This paper attempts to present such a method, derived primarily from experimental data, but with occasional reliance upon theoretical calculations. Certain essential desi... View full abstract»

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  • A simplified diversity communication system for beyond-the-horizon links

    Publication Year: 1956, Page(s):50 - 55
    Cited by:  Papers (41)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (335 KB)

    For nearly a year the US Federal TelecomMunication Laboratories have had in operation a 900 mc beyond-the-horizon two-way link between the Nutley, New Jersey laboratories and Southampton, Long Island. Early results using PTM have already been reported. Briefly, an annual median path-loss some 20db greater than that predicted by Bullington was found, but the bandwidth was adequate for pulse modulat... View full abstract»

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  • Design Considerations for Space Communication

    Publication Year: 1959, Page(s):232 - 240
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1225 KB)

    With the advent of Russian and American artificial earth satellites, the use of such vehicles for communication purposes has been the subject of considerable study both by military and commercial organizations in the communications field. The purpose of this paper is to delineate the problems involved in space communication, the assumptions that must be made and the technical limitations which det... View full abstract»

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  • Design considerations for a linear VHF transmitter

    Publication Year: 1956, Page(s):14 - 17
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (374 KB)

    As the spectrum becomes more crowded and as communication centers become more complex the need for equipement which will help alleviate the interference problems becomes more pressing. these problems were given partucular consideration in planning the design of a new 50 Watt AM transmitter for fixed station use in the range lO8 to 152 Mc. Some of these problems and the steps taken to solve them in... View full abstract»

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  • Propagation, Noise, and General Systems Considerations in Earth-Space Communications

    Publication Year: 1960, Page(s):214 - 221
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (792 KB)

    As man's ability to escape the attraction of the earth's gravitational field increases, the science of earth-space communications becomes more and more important. In this paper, an attempt is made to analyze the relevant propagation, noise and general system aspects of earth-space systems and to predict the operating frequencies for maximum range. The earth's atmosphere is shown to be nearly trans... View full abstract»

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  • HF Radio Data Transmission

    Publication Year: 1961, Page(s):21 - 28
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (918 KB)

    An exposition of some of the past, present and future activity of the U. S. Army Signal Research and Development Laboratory in the field of HF radio data transmission is treated in broad terms. A limited base for use in comparison with HF channel attributes is set up by relating the data-handling characteristics of switched long-distance telephone lines. Generalized criteria of performance for dig... View full abstract»

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  • Choosing the Optimum Type of Modulation - A Comparison of Several Communication Systems

    Publication Year: 1958, Page(s):14 - 21
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (932 KB)

    The engineer designing a new communications system often has available a choice between several different types of RF modulation. The four main methods considered here are standard amplitude (AM), double-sideband suppressedcarrier (DSBSC), single-sideband (SSB), and frequency (FM) modulations. Some of their basic system performance characteristics are evaluated on a comparative basis for the trans... View full abstract»

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  • The Theory of FM Demodulation with Frequency-Compressive Feedback

    Publication Year: 1962, Page(s):226 - 245
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2307 KB)

    The application of frequency-compressive feedback around an amplitude-insensitive FM demodulator promises important reductions of distortion and noise sensitivity in the demodulation of wide-band FM signals. In this paper, the basic theory of FM demodulation with frequency-compressive feedback (FCF) is presented after a brief discussion of the concept of noise threshold and of the usefulness of th... View full abstract»

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  • Predetection Diversity Combining with Selectively Fading Channels

    Publication Year: 1962, Page(s):32 - 42
    Cited by:  Papers (83)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (859 KB)

    The effective use of predetection (or IF) linear combining of diversity channels requires that all frequency components be added in = phase. In view of the time-variant phase characteristics of fading channels, some form of instantaneous phase correction must be provided prior to the diversity combining so that proper in-phase addition will result. If the instantaneous fading is not uniform over t... View full abstract»

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  • Information Transmission Rate at Very Low Signal and Noise Power

    Publication Year: 1962, Page(s):407 - 415
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (676 KB)

    Assuming very low signal and noise power at the receiver, the transmission rate of information is calculated for peak power and average power limitation. These calculations are made using the assumption that the signal energy received is a Poissondistributed random variable. The result is compared with that in the high-power case. View full abstract»

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  • The Square-Law Single-Sideband System

    Publication Year: 1962, Page(s):257 - 267
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1207 KB)

    A new method of generation of a single-sideband signal has been developed which provides distortionless reception with a square-law envelope detector. This performance is achieved through a new system design rather than a less subtle method, such as carrier reinsertion. It is well known that a single-sideband signal can be represented as a combination of amplitude and phase-modulated signals. Most... View full abstract»

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  • Constant-Ratio Code and Automatic-RQ on Transoceanic HF Radio Services

    Publication Year: 1960, Page(s):72 - 75
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (506 KB)

    Historical development, of present-day commercial teleprinter services, is briefly tabulated according to dates of significant advances. The 7-unit form of basic constant-ratio code is given, and its advantages explained; indicative values of improvement are tabulated. A general description of the Automatic-RQ method and system-rather than specific designs-is given. Commercial application and grow... View full abstract»

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  • The Atomichron: An atomic frequency standard

    Publication Year: 1957, Page(s):25 - 27
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (246 KB)

    The Atomichron is the first practical device to refer time to an atomic standard. The four most basic quantites involved in physical measurements are length, mass, charge and time and it is essential that a standard unit be defined for each of these entities - a standard unit which is unvarying and is readily accessible for comparison at any desired time. It is an accepted fact that the elementary... View full abstract»

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  • A Coherent Digital Amplitude and Phase Modulation Scheme

    Publication Year: 1962, Page(s):90 - 95
    Cited by:  Papers (48)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (503 KB)

    In this paper, we present a technique for a combination of amplitude and phase modulation for digital communication. This technique assumes phase coherence between transmitter and receiver. For purposes of analysis, we also assume baud synchronization. The technique involves the simultaneous and independent amplitude modulation of two carriers of the same frequency which are in quadrature with eac... View full abstract»

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  • Consideration of mechanical and LC type filters

    Publication Year: 1956, Page(s):54 - 57
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (598 KB)

    In comparing the usefulness of various filters for a given device, the design engineer is confronted with many questions. In most instances these questions can be answered readily because of predominance of a performance requirement for which alternate solutions are not available. In other instances, however, there may be several suitable solutions. The designer will then have to decide on the bas... View full abstract»

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  • Progress of tropospheric propagation research related to communications beyond the horizon

    Publication Year: 1956, Page(s):6 - 16
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1099 KB)

    It is proposed to give a simple elementary review of tropospheric mechanisms believed to be capable of propagating short radio waves well beyond the earth's horizon together with some selected experimental data indicatine the potential communication capacity of these tropospheric propagation mechanisms. In view of the wide general interest in the useful applications of the propagation of short rad... View full abstract»

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  • Group Synchronization for Digital Transmission Systems

    Publication Year: 1962, Page(s):381 - 390
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (939 KB)

    Group synchronization systems with digital feedback are studied, which are particularly applicable for PCM systems. Group synchronization is used to determine the time origin of a sequence of binary signals by finding a specified deterministic pattern from a randomly modulated binary sequence. A statistical analysis is made on the recovery process of synchronization, which is a discrete-time rando... View full abstract»

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  • The Comparison of Digital Communication Systems

    Publication Year: 1960, Page(s):141 - 150
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1022 KB)

    Two methods are proposed for comparing the performances of digital communication systems differing in the number of available signals, in bandwidth, in rate of transmission, and in complexity. The systems are ranked on the basis of the probability of correct reception of transmitted messages. The signal durations are adjusted so that the systems have either equal bandwidths or equal rates of trans... View full abstract»

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  • Reduction of Quantizing Noise by Use of Feedback

    Publication Year: 1962, Page(s):373 - 380
    Cited by:  Papers (76)  |  Patents (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (669 KB)

    Many information transmission systems use a discrete (digital) channel. Since most input signals are continuous, the conversion cannot be accomplished without an error which, for many cases, may be considered to have the characteristics of white noise. A method has been suggested to reduce this error by using linear feedback around the quantizer to shape the noise spectrum. Each output sample will... View full abstract»

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  • Interdependence Between Hourly Median Transmission Loss and Surface Refractivity Index Observed at 900 Mc on a 232-Mile Far-Beyond-the-Horizon Path

    Publication Year: 1961, Page(s):445 - 450
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (622 KB)

    A detailed analysis is made of propagation data obtained from the North Atlantic Scatter System installed in Iceland. In particular, the correlation of the transmission loss and meteorological observations on a long path is analyzed in detail. By separating the data into various time periods, it is shown that for periods of time during which the received field is lowest, the correlation between tr... View full abstract»

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  • Evaluation of IF and Baseband Diversity Combining Receivers

    Publication Year: 1958, Page(s):8 - 13
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (641 KB)

    Techniques of diversity reception have advanced rapidly with the advent of over-the-horizon communication. Because of the rapidly fluctuating signals encountered in tropospheric scatter propagation, strong-signal selection (switching diversity) has been largely supplanted by more sophisticated signal-combining techniques. Present tropospheric scatter systems commonly employ either postdetection ra... View full abstract»

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  • Improved Multiplex Voice Frequency Carrier Systems Using New Audio Filters

    Publication Year: 1960, Page(s):258 - 262
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (895 KB)

    Using resonators built with high "Q" ferrite-cored inductors and suitably selected plastic film capacitors, improved band-pass and band-elimination filters have been designed which allow the accommodation of duplex high-speed telegraphy channels in a mid-band-speech carrier circuit, with small degradation in voice quality and with negligible cross-talk. It is shown that in such a circui... View full abstract»

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  • Analysis of a Phase-Modulation Communications System

    Publication Year: 1960, Page(s):221 - 227
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (599 KB)

    A communication system is analyzed which utilizes phase modulation (PM) and phase detection. The analysis shows that when the total radio frequency (RF) power level is significantly above the receiver threshold, a margin of safety exists which may be traded for additional signal-to-noise ratio (SNR) at the demodulated output of the receiver. In this respect the PM system is similar to FM communica... View full abstract»

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  • An Underwater Communication System

    Publication Year: 1959, Page(s):249 - 251
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (371 KB)

    Communications between submerged submarines and surface craft require energy to be propagated through sea water. The only practical method for transmitting this energy is by acoustic means. Both FM and AM transmission systems have been used, but for long-range communication, a single-sideband suppressed-carrier transmission system is the only effective way of propagating sound energy. The requirem... View full abstract»

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  • A Comparison of Frequency-Shift Anti-Multipath Signaling Techniques for Digital Communication Systems

    Publication Year: 1961, Page(s):83 - 87
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (450 KB)

    An important result of multipath propagation is the lengthening of the received signal due to a single transmitted pulse. The received pulse duration may be increased by the difference in propagation times between the longest and shortest of the active paths. This time difference represents the minimum pulse repetition period which can be used if errors due to inter-symbol interference are to be a... View full abstract»

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  • An Analysis of Cascaded Binary Communication Links

    Publication Year: 1962, Page(s):291 - 299
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (704 KB)

    The performance of cascaded binary communication links in the presence of additive white Gaussian noise is investigated for the cases of constant and Rayleigh-distributed signal levels. An exact expression is derived for over-all error probability for any number of links with constant signal levels. The reliability of five modulation techniques is examined when independent or dependent Rayleigh fa... View full abstract»

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  • White Alice System - Design and Performance

    Publication Year: 1959, Page(s):272 - 277
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (713 KB)

    White Alice is an extensive communications network covering the entire state of Alaska. It provides essential defense communications as well as service for other government agencies and civilian commercial service. Both telephone and telegraph channels are provided with capacity for future growth. The Western Electric Company, as prime contractor for the USAF AMC, undertook the engineering, procur... View full abstract»

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  • Transmission Loss Curves for Propagation at Very Low Radio Frequencies

    Publication Year: 1958, Page(s):58 - 61
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (642 KB)

    Curves of the transmission loss are presented for the propagation to great distances at frequencies in the range 10 to 20 kc. The theoretical model of the ionosphere assumed is a sharply bounded homogeneous ionized medium. The working formula for the field is a sum of waveguide-type modes. The calculated results compare favorably with experimental data at 16.6 kc over the Pacific Ocean. View full abstract»

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  • Jamming Vulnerability of Communication Systems

    Publication Year: 1961, Page(s):226 - 232
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (699 KB)

    This paper presents the procedure for evaluating the jamming vulnerability of a communication system. The factors considered include system performance under laboratory conditions, characteristics of transmission channels, power and transmitter design of jammer, and the costs of desired communication and jamming systems. View full abstract»

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  • On Optimal Diversity Reception, II

    Publication Year: 1962, Page(s):22 - 31
    Cited by:  Papers (56)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (824 KB)

    In a previous paper the structure of the optimal multi-diversity receiver for a fading, noisy diversity channel was determined under the assumption that the memory of the receiver does not extend beyond the time interval of the signal currently being received. The probability of error for such a receiver is determined herein under the following assumptions: the channel is binary and symmetric; the... View full abstract»

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  • An Electronic Multicoupler and Antenna Amplifier for the VHF-Range

    Publication Year: 1957, Page(s):43 - 48
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (658 KB)

    A single-stage distributed amplifier for the frequency range from 25 to 223 Mc/s may be used as an antenna amplifier for compensation of cable-attenuation or, in connection with a divider network, as a multicoupler for feeding six receivers from a common antenna. Singlestage amplification results in not only low noise level due to the parallel tube circuitry employed but also in a low cross-modula... View full abstract»

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  • FM and SSB Radiotelephone Tests on a VHF Ionospheric Scatter Link During Multipath Conditions

    Publication Year: 1960, Page(s):183 - 187
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    Experiments have been carried out on an ionosphericscatter link to observe the effects of long-delayed multipath signals, caused by F2propagated back scatter, on the intelligibility of voice communication. Frequency modulation and single-sideband modulation equipments were used for the tests. During periods when the back-scatter signal levels approached the level of the normal ionospher... View full abstract»

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  • Synchronous Demodulation of Phase-Reversing Binary Signals, and the Effect of Limiting Action

    Publication Year: 1961, Page(s):77 - 82
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (625 KB)

    It is shown that a considerable improvement of SNR in the output is produced in a synchronous demodulator (when the SNR in the input is greater than unity) by interchanging the input terminals with the local oscillator terminals of the modulator circuit when this is of the switching type, or by using a balanced limiter followed by a linear multiplier. Owing to the nonlinear relationship introduced... View full abstract»

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  • Path Loss Measurements vs Prediction for Long Distance Tropospheric Scatter Circuits

    Publication Year: 1961, Page(s):439 - 445
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (743 KB)

    Before any communications circuit can be established between two points, whether it be by wire lines, or by tropospheric or ionospheric radio propagation, a thorough knowledge of the intended path should be obtained so that an efficient and economical installation can be made. Each system should have as high a reliability as is required for its intended use. Tropospheric forward scatter circuits h... View full abstract»

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  • An Air Force single sideband system

    Publication Year: 1956, Page(s):85 - 93
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (447 KB)

    Thls paper gives a general description of a single sideband communications system which is presently being developed for the US Air Force. It was written early in the progress of the development, and hence, certain of the detailed descriptions as given will change as the program approaches maturity. The program is intended to provide more reliable HF communications by exploiting Single Sideband te... View full abstract»

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  • Aviation Communications Facilities for the Next Ten Years

    Publication Year: 1956, Page(s):26 - 33
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (929 KB)

    The object of this program has been to recommend, for domestic civil aeronautical communications, both point/point and air/ground (excluding tower), a systems and implementations plan which will best satisfy anticipated requirements for the next 10 years. View full abstract»

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  • Development of Sydney, Nova Scotia-St. John's, Newfoundland Canadian National Telegraphs Microwave System

    Publication Year: 1961, Page(s):165 - 175
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1545 KB)

    A 650-mile radio-relay system composed of 22 "lineof-sight" paths was constructed to supplement the Canadian National Communications between Sydney, Nova Scotia, and St. John's, Newfoundland. Relay repeater points were chosen by means of all available contoured maps and on-site surveys of the various points, bearing in mind radio transmission characteristics and also accessibility for maintenance.... View full abstract»

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  • Results of UHF Mutual Enviroment Test Program at Rome Air Developement Center

    Publication Year: 1957, Page(s):60 - 81
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2174 KB)

    This report is a summary of UHF mutual interference tests performed at the Rome Air Development Center, Rome, New York. Initial tests were performed in the Laboratory and at the Verona Test Site of RADC by RADC engineers to obtain interference characteristics and operational parameters of the UHF communications equipment. The results of these tests, which are presented in Phase A, were submitted t... View full abstract»

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  • Performance of Digital Phase-Modulation Communication Systems

    Publication Year: 1959, Page(s):3 - 6
    Cited by:  Papers (64)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (390 KB)

    This paper analyzes the performance of digital phase modulation systems in Gaussian noise and determines required signal-to-noise ratio as a function of the number of discrete phases and the desired error rate, under conditions of no fading. Both coherent detection with a locally-derived reference carrier and phase comparison detection are considered. The calculations show that multiphase modulati... View full abstract»

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  • Microwave System Engineering Using Large Passive Reflectors

    Publication Year: 1962, Page(s):304 - 311
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1154 KB)

    This paper will provide the microwave engineer with the basic techniques of microwave system engineering using large passive reflectors and will outline the many advantages of their use. Small passive reflectors of the "periscope type" have been used for many years on microwave systems. Large passive reflectors have also been used but to a much lesser degree. Large passives may be used at intermed... View full abstract»

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  • Military Radio Communications Equipment Cost-Design Relationships

    Publication Year: 1960, Page(s):203 - 206
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (445 KB)

    A method is presented for determining the relationships between the "costs" (size, weight, dollars) and the electrical characteristics (frequency, bandwidth, input power, output power, atenna gain) of radio equipment used in military communications systems. The compilation of pertinent data is described, and a series of empirical "trade-off" curves displaying cost-design relationships as they exis... View full abstract»

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  • Combined Digital Phase and Amplitude Modulation Communication Systems

    Publication Year: 1960, Page(s):150 - 155
    Cited by:  Papers (59)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (599 KB)

    The performance of phase modulation communication systems is investigated for the asymptotic case of a high signal-to-noise ratio. A simple and excellent approximation to the probability of error is derived for both coherent and phase-comparison demodulation. In addition, a simple expression is derived for the asymptotic degradation of phase-comparison demodulation. When the number of bits per sam... View full abstract»

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  • Impulsing of Linear Networks in Integrated Data Systems

    Publication Year: 1959, Page(s):189 - 194
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (609 KB)

    Waveforms useful in data transmission may be obtained by impulsing suitable linear networks, and these same networks may be used, in certain cases, as receiving matched filters. A filter design for certain low-pass waveforms is described, together with a procedure for realizing band-pass analogs of these low-pass waveforms. The latter avoid the use of modulators. Practical results are described. View full abstract»

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  • Demonstration of Delay Distortion Correction by Time-Reversal Techniques

    Publication Year: 1957, Page(s):2 - 7
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (491 KB)

    Experiments relating to methods of correcting delay distortion by time-reversal have been made utilizing a slow-speed picture transmission system. The improvements in picture quality by phase correction of a 3 KC telephone loop 30.4 miles long and a 5 KC loop from Murray Hill, N. J., to Los Angeles, Calif., and back are demonstrated. The total distance that the signal was transmitted over the 5 KC... View full abstract»

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Aims & Scope

This Transactions ceased publication in 1962. The current retitled publication is  IEEE Transactions on Communications.

Full Aims & Scope