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IRE Transactions on Communications Systems

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

    Publication Year: 1960, Page(s):57 - 67
    Cited by:  Papers (244)
    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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  • 2. 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 (7)
    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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  • 3. Effect of Propagation Fading and Antenna Fluctuations on Communication Systems in a Jamming Environment

    Publication Year: 1962, Page(s):43 - 60
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2199 KB)

    The effect of different degrees of both slow propagation fading and antenna fluctuations on the performance of communication systems in the presence of interference was analyzed. The performance of the system was evaluated from the aspect of the probability of error which in turn is related to the required system margin. The results are plotted for a large variety of fading conditions for both the... View full abstract»

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  • 4. Predetection Diversity Combining with Selectively Fading Channels

    Publication Year: 1962, Page(s):32 - 42
    Cited by:  Papers (70)
    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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  • 5. On the Optimum Detection of Digital Signals in the Presence of White Gaussian Noise-A Geometric Interpretation and a Study of Three Basic Data Transmission Systems

    Publication Year: 1962, Page(s):336 - 372
    Cited by:  Papers (44)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2976 KB)

    This paper considers the problem of optimally detecting digital waveforms in the presence of additive white Gaussian noise. A technique for representing the transmitted signals and the additive noise which leads to a geometric interpretation of the detection problem is presented on a tutorial level. Subsequently, this technique is used to derive the optimum detector for each of three basic data tr... View full abstract»

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  • 6. Theoretical Diversity Improvement in Multiple Frequency Shift Keying

    Publication Year: 1962, Page(s):177 - 184
    Cited by:  Papers (49)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (564 KB)

    Multiple frequency shift keying (MFSK) is a modulation suitable for transmitting digital data under fading conditions. A quantitative analysis of MFSK-with-diversity is presented. The MFSK signals on the several diversity channels are presumed to be perturbed independently by Rayleigh fading and additive white Gaussian noise. Also, it is assumed that fading is slow and that envelope, cross-correla... View full abstract»

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  • 7. Synchronous Communications

    Publication Year: 1957, Page(s):99 - 105
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (824 KB)

    It can be shown that present usage of amplitude modulation does not permit the inherent capabilities of the modulation process to be realized. In order to achieve the ultimate performance of which AM is capable synchronous or coherent detection techniques must be used at the receiver and carrier suppression must be employed at the transmitter. When a performance comparison is made between a synchr... View full abstract»

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  • 8. Performance of Digital Phase-Modulation Communication Systems

    Publication Year: 1959, Page(s):3 - 6
    Cited by:  Papers (55)
    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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  • 9. 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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  • 10. The Theory of FM Demodulation with Frequency-Compressive Feedback

    Publication Year: 1962, Page(s):226 - 245
    Cited by:  Papers (6)
    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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  • 11. High-Gain Antennas for VHF Scatter Propagation

    Publication Year: 1956, Page(s):56 - 63
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (793 KB)

    Rhombic antennas were the first type employed in the study of propagation via ionospheric scatter. By the use of electrically long leg-lengths gains of the order of 20 decibels were obtained. Experimental measurements using model techniques indicated that assumptions usual in the design of rhombic antennas remained valid even for leg-lengths of 25 to 40 wavelengths. In order to obtain a more compa... View full abstract»

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  • 12. Demonstration of Delay Distortion Correction by Time-Reversal Techniques

    Publication Year: 1957, Page(s):2 - 7
    Cited by:  Papers (13)
    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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  • 13. A Coherent Digital Amplitude and Phase Modulation Scheme

    Publication Year: 1962, Page(s):90 - 95
    Cited by:  Papers (30)  |  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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  • 14. Microwave System Engineering Using Large Passive Reflectors

    Publication Year: 1962, Page(s):304 - 311
    Cited by:  Papers (1)
    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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  • 15. Oblique-Sounding and HF Radio Communication

    Publication Year: 1961, Page(s):275 - 279
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (554 KB)

    The sweep-frequency oblique sounder is a powerful tool for the study of ionospheric propagation over actual communication circuits. In addition, since it provides the pulse response of the ionosphere as a function of frequency it is potentially a powerful tool for improving communication via the ionsphere. The Defence Research Telecommunications Establishment's (DRTE) experience in using sweep-fre... View full abstract»

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  • 16. The Comparison of Digital Communication Systems

    Publication Year: 1960, Page(s):141 - 150
    Cited by:  Papers (7)
    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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  • 17. Information Rates in Remoted Radar Systems

    Publication Year: 1956, Page(s):120 - 128
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (785 KB)

    Air traffic information collected by long range radars is available to the CAA at the radar sites. This information will be remoted to the air route traffic control center. A theoretical study is made here of resolving power and the information rate inherent in the air traffic, radar video signals, displays, and various transmission techniques. Air traffic provides the basic information and radar ... View full abstract»

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  • 18. Reduction of Quantizing Noise by Use of Feedback

    Publication Year: 1962, Page(s):373 - 380
    Cited by:  Papers (63)  |  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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  • 19. A simplified diversity communication system for beyond-the-horizon links

    Publication Year: 1956, Page(s):50 - 55
    Cited by:  Papers (38)
    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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  • 20. Routing Procedures in Communications Networks-Part I: Random Procedures

    Publication Year: 1962, Page(s):322 - 329
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (883 KB)

    A study is made of possible routing procedures in military communications networks in order to evaluate these procedures in terms of future tactical requirements. In Part I this study is devoted to procedures involving random choices. In such networks each message path is essentially a random walk. Estimates of the average traverse time of each message and average traffic flow through each node ar... View full abstract»

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  • 21. Performance of Combined Amplitude and Phase-Modulated Communication Systems

    Publication Year: 1960, Page(s):232 - 237
    Cited by:  Papers (27)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (539 KB)

    The performance of two types of digital phase-and amplitude-modulated systems is investigated for the high signal-to-noise ratio region. Approximate expressions for the probability of error and channel capacity of the more optimum of these two systems are compared with corresponding expressions for probability of error and channel capacity for a digital phase-modulated system. It is shown that the... View full abstract»

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  • 22. Transmitter Power Control in Two-Way Communications System

    Publication Year: 1960, Page(s):48 - 56
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1069 KB)

    A typical scatter communications loop consists of two sites, each having transmitters and receivers operating simultaneously over a two-way microwave loop. In tropospheric scatter systems, disturbances in the microwave paths produce dynamic fading of RF signal levels at the receivers. To achieve high system reliability, the current practice is to continuously transmit high power, adequate to maint... View full abstract»

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  • 23. Combined Digital Phase and Amplitude Modulation Communication Systems

    Publication Year: 1960, Page(s):150 - 155
    Cited by:  Papers (47)  |  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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  • 24. 50-kw Antenna Switching System

    Publication Year: 1959, Page(s):295 - 301
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2002 KB)

    There are many HF radio installations today that illustrate the need for an improved antenna switching technique. Today there is a growing requirement to connect rapidly any one of several 50-kw transmitters to any one of many antennas. An antenna switching system must be broad-band, convenient to use, fast, safe for operating personnel, and free of appreciable impedance discontinuities. This pape... View full abstract»

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  • 25. Digital Data Transmission Systems of the Future

    Publication Year: 1961, Page(s):88 - 96
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1079 KB)

    General predictions are made about the development of the state of the art by shortly reviewing the latest findings of theoretical investigations as well as hardware developments. A few examples are given to illustrate recent attempts to reorganize, standardize and integrate present day digital data processing and transmission systems for future use. Concepts of "data moving" and "dynamic matching... View full abstract»

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  • 26. Criteria for the Ultimate Capability of the Optimized Tropospheric Scatter System

    Publication Year: 1960, Page(s):187 - 192
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (542 KB)

    Behavior of the tropospheric scatter mechanism is now sufficiently well understood to permit a determination of optimum transmission criteria. The requirements for optimization are established from the channel signal-to-noise ratio equation. It is shown that the optimum is related not only to the basic RF transmission loss, but also to the effective noise figure, antenna gain and medium aperture l... View full abstract»

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  • 27. Routing Procedures in Communications Networks-Part II: Directory Procedures

    Publication Year: 1962, Page(s):329 - 335
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (785 KB)

    This part of the report on routing procedures is devoted to procedures involving no random choices. Estimates of the average traverse time of each message and average traffic flow through each node are derived by statistical methods and compared with the corresponding results obtained in Part I for routing procedures based on random choices. These estimates are verified by means of a large-scale s... View full abstract»

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  • 28. Consideration of Nonlinear Noise and its Testing in Frequency Division Multiplex Voice UHF Radio Communication Systems

    Publication Year: 1961, Page(s):115 - 129
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1201 KB)

    In UHF radio communications systems, the thermal noise limits the performance under weak received signal conditions. When the signal is strong, the nonlinear noise (sometimes called the intermodulation noise) may become the limiting factor. it is, therefore, imperative to control the intermodulation distortion contribution from the system components by careful equipment design and from the medium ... View full abstract»

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  • 29. A Synchronized Pulse Communication System with Pseudorandom Interpulse Period

    Publication Year: 1962, Page(s):109 - 113
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (576 KB)

    The security of a pulse type communication system can be improved by the incorporation of an element of randomness in the time of transmission. A system is simulated in which a remote receiver is caused to be gated on at apparently random intervals which are in synchronism with the arrival of the signal from the controlling local transmitter. The time of transmission is not random, but is determin... View full abstract»

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  • 30. Consideration of Mechanical and LC Type Filters - Part II

    Publication Year: 1956, Page(s):58 - 72
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (940 KB)

    The performance characteristics of any filter may be entered onto a graph of the amount of resonant elements vs. either shape factor or the Q's of the individual resonant elements. If curves of various design styles are also drawn on these graphs, one may compare how nearly a particular filter approaches the theoretically best performance for its style. Such curves are presented for typical filter... View full abstract»

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  • 31. Comparative Performance of Digital Data Transmission Systems in the Presence of CW Interference

    Publication Year: 1962, Page(s):169 - 177
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (911 KB)

    During the last decade there has been a considerable amount of work done on the analysis of digital data transmissions in an interference environment. With few exceptions, the type of additive interference considered is normal noise. This paper treats the case where the interference consists of CW that falls within the pass band of the receiver. The results obtained can also be utilized to ascerta... View full abstract»

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  • 32. A High Power Linear Amplifier for Single Sideband Applications

    Publication Year: 1956, Page(s):98 - 102
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (620 KB)

    The design of a high power linear amplifier intended for use as a power amplifier for Single Sideband transmitters is discussed. The availability of new components and a new concept of pi type tank circuits permit avoiding difficulties experienced in previous designs. This new linear amplifier provides up to 30 KW output in the frequency spectrum from 4.0 to 26.5 MC with low distortion products on... View full abstract»

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  • 33. Spectrum of Frequency-Shift Radio Photo-Transmissions

    Publication Year: 1956, Page(s):27 - 40
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    The spectrum of frequency-shift and subcarrier frequency-shift radio-photo transmissions are obtained from the general expression for the spectrum of a carrier which is frequency modulated with a triangular pulse. A simplified asymptotic expression for rapidly determining the high order sideband amplitudes is developed along with expressions for the interfering bandwidths of radio-photo transmissi... View full abstract»

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  • 34. 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 (99)
    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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  • 35. Radio Communications - A Renascent Art

    Publication Year: 1958, Page(s):33 - 34
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (211 KB)

    First Page of the Article
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  • 36. 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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  • 37. Practical and Theoretical Design Cosiderations for Bridge Negative Feedback Amplifiers in Carrier Telephony

    Publication Year: 1957, Page(s):26 - 31
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (481 KB)

    The problem of providing proper impedance matching for interconnecting circuitry in Carrier Telephony Systems is of first-order importance. Transmission branches that contain nonpassive elements, such as amplifiers, are of particular concern and thus require special treatment. Bridge feedback amplifiers employing a hybrid output transformer offer outstanding advantages as a solution. Basic design ... View full abstract»

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  • 38. Errors in Data Transmission Systems

    Publication Year: 1961, Page(s):15 - 20
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    The aims and methods of a program of work being conducted at the Lincoln Laboratory of the Massachusetts Institute of Technology in data-transmission research are discussed. The work, which has been concentrated primarily on telephone circuits of a type generally available, is aimed at a better understanding of these transmission media. Machines for the measurement of error and error distributions... View full abstract»

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  • 39. Techniques for Incoherent Scatter Communication

    Publication Year: 1962, Page(s):154 - 160
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (720 KB)

    Special radiometric-detection procedures are appropriate when communication signals are severely distorted by a rapidly fluctuating, noisy, time-dispersive channel. This paper presents a performance analysis of some digital communication techniques that can be used when most other techniques fail. Error-probability expressions are derived and evaluated for a wide range of possible operating condit... View full abstract»

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  • 40. Disaster Planning in the Field of Communications

    Publication Year: 1956, Page(s):168 - 171
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (501 KB)

    In the past the Telephone Company has been confronted with many emergencies due to fires, floods, hurricanes, etc., which have required prompt action to establish, maintain and restore communications. Throughout the years, a vast amount of experience has been gained and a welltrained organization established. Planning for major disasters in the Washington area, including recent construction activi... View full abstract»

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  • 41. 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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  • 42. Performance Analysis of a Data Link System

    Publication Year: 1959, Page(s):14 - 24
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1748 KB)

    Because of the increased traffic densities and aircraft speeds contemplated in the near future, the present air-trafficcontrol (ATC) system must be improved by a far more efficient and partially automatic system. To prevent further burden on alreadyburdened voice-communication facilities and frequencies, there is a requirement for more efficient means of transferring information between air and gr... View full abstract»

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  • 43. 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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  • 44. Inhibited Error-Correction Decoder Performance

    Publication Year: 1962, Page(s):425 - 435
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (706 KB)

    An "inhibited" error-correction decoder is defined as one which inhibits its output of decoded information bits when an uncorrectable error is detected. The output bit error rate, probability of false acceptance, and other performance parameters of inhibited decoders are expressed as responses to uncorrectable errors and the effect of such errors on several error-correction decoders of practical i... View full abstract»

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  • 45. Multiple Echo Distortion in Frequency-Modulation, Frequency-Division-Multiplex Trunk Radio Systems

    Publication Year: 1962, Page(s):61 - 71
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (860 KB)

    This paper is concerned with intermodulation distortion in FM, FDM trunk radio systems due to a number of echoes of differing amplitudes and delay times. General formulas are developed, and applied to the case of a 960-channel system subjected to distortion due to echoes from flanges in waveguide runs. Examples considered are 100- and 200-ft runs of RG-50/U waveguide, in 10-ft sections, for use in... View full abstract»

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  • 46. Recording type direction finder

    Publication Year: 1960, Page(s):81 - 82
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (181 KB)

    The authors formerly made a report on a direct vision type direction finder for high frequency, which has high sensitivity and by which multiple signals or scattering signals can also be measured. Since then, the finder has been used for studying characteristics of the ionospheric propagation waves. In order to make continuous measurement of bearing convenient, a recording apparatus adaptable to t... View full abstract»

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  • 47. Air Traffic Control in the Jet Age

    Publication Year: 1956, Page(s):34 - 47
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1200 KB)

    An effective forward step in terminal area air traffic control has been accomplished by development and installation of Radar Approach Control (RAPCON) Center and control tower prototype facilities described. Esoteric complexes detailed provide airport and approach controllers with radar and communication implementation of manual aids to jet and propeller driven traffic control procedures and tech... View full abstract»

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  • 48. Performance of Error-Correcting Codes

    Publication Year: 1962, Page(s):72 - 85
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1132 KB)

    Binary decoding of relatively short codes corrupted by Gaussian noise or pulse interference has been considered in applications for which the minimum useful information block length is unity, equal to the information bit capacity of a code, or equal to an integral multiple of the information capacity of a code. The following results pertain to applications which are further characterized by the pe... View full abstract»

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  • 49. Evaluation of IF and Baseband Diversity Combining Receivers

    Publication Year: 1958, Page(s):8 - 13
    Cited by:  Papers (10)
    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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  • 50. Concerning Optimum Frequencies for Space Vehicle Communication

    Publication Year: 1959, Page(s):167 - 173
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (739 KB)

    Optimum frequencies for the varied needs of space vehicle communication can best be determined from the estimated system performance. Each of the contributing equipment and propagation factors over the range of the radio frequency spectrum affects the minimum tolerable signal-to-noise power ratio at the receiver. Over the range of the radio frequency spectrum, the behavior of the individual buildi... 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