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IEEE Transactions on Communication Technology

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

    Publication Year: 1971, Page(s):628 - 634
    Cited by:  Papers (1097)  |  Patents (172)
    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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  • 2. The Divergence and Bhattacharyya Distance Measures in Signal Selection

    Publication Year: 1967, Page(s):52 - 60
    Cited by:  Papers (701)  |  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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  • 3. Performance of an Efficient Parallel Data Transmission System

    Publication Year: 1967, Page(s):805 - 811
    Cited by:  Papers (352)  |  Patents (58)
    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 rate b , spaced b/2 apart 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 an... View full abstract»

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  • 4. Convolutional Codes and Their Performance in Communication Systems

    Publication Year: 1971, Page(s):751 - 772
    Cited by:  Papers (442)  |  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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  • 5. Dither Signals and Their Effect on Quantization Noise

    Publication Year: 1964, Page(s):162 - 165
    Cited by:  Papers (191)  |  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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  • 6. Viterbi Decoding for Satellite and Space Communication

    Publication Year: 1971, Page(s):835 - 848
    Cited by:  Papers (242)  |  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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  • 7. An Adaptive Decision Feedback Equalizer

    Publication Year: 1971, Page(s):281 - 293
    Cited by:  Papers (81)  |  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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  • 8. Self-Similar Error Clusters in Communication Systems and the Concept of Conditional Stationarity

    Publication Year: 1965, Page(s):71 - 90
    Cited by:  Papers (53)  |  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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  • 9. Adaptive Feedback Communications

    Publication Year: 1968, Page(s):29 - 34
    Cited by:  Papers (159)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (590 KB)

    A scheme for transmitting binary signals through a Rayleigh fading multipath medium is analyzed. The scheme envisions an adaptive receiver and a feedback channel. The feedback channel conveys information to the transmitter on the forward channel state learned at the receiver. The transmitter uses this information to modify transmission. Results that show the improvement in performance of the syste... View full abstract»

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

    Publication Year: 1968, Page(s):529 - 540
    Cited by:  Papers (145)  |  Patents (35)
    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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  • 11. Experimental Confirmation of an HF Channel Model

    Publication Year: 1970, Page(s):792 - 803
    Cited by:  Papers (130)  |  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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  • 12. Correlative Digital Communication Techniques

    Publication Year: 1964, Page(s):128 - 135
    Cited by:  Papers (74)  |  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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  • 13. Adaptive Variable-Length Coding for Efficient Compression of Spacecraft Television Data

    Publication Year: 1971, Page(s):889 - 897
    Cited by:  Papers (54)  |  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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  • 14. Data-Aided Carrier Tracking Loops

    Publication Year: 1971, Page(s):157 - 168
    Cited by:  Papers (13)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (926 KB)

    An innovation which improves the capability and performance of certain types of phase-coherent demodulators is introduced. This innovation has application in the fields of telemetry and tracking, e.g., relay satellite systems, deep-space communications, and military communication systems. The basic idea of the innovation centers around using the power in the composite signal sidebands to enhance t... View full abstract»

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  • 15. Serial Synchronization of Pseudonoise Systems

    Publication Year: 1964, Page(s):123 - 127
    Cited by:  Papers (38)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    Radar, communications, and ranging systems can use pseudonoise modulated carriers. The extraction of information from the carrier requires the synchronization of a pseudonoise waveform at the receiver for correlation detection. For initial synchronization, the receiver must examine all possible time positions of the incoming pseudonoise waveform. In serial search the time difference between the ps... View full abstract»

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  • 16. The Effect of Gaussian Error in Maximal Ratio Combiners

    Publication Year: 1971, Page(s):492 - 500
    Cited by:  Papers (148)
    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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  • 17. The Spectrum of a High-Index FM Waveform: Woodward's Theorem Revisited

    Publication Year: 1969, Page(s):201 - 208
    Cited by:  Papers (27)
    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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  • 18. Atmosphere Propagation and Communication Channel Model for Laser Wavelengths

    Publication Year: 1970, Page(s):396 - 416
    Cited by:  Papers (20)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2486 KB)

    The advent of the laser has generated much interest in its use for communication. Consideration is given in this paper to obtaining a communication channel model of the atmosphere for laser frequencies. For this purpose a fairly exhaustive, tutorial, and partly critical review of a major part of the extensive literature pertaining to theoretical and experimental results on the propagation of laser... View full abstract»

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  • 19. Generalization of a Techinque for Binary Data Communication

    Publication Year: 1966, Page(s):67 - 68
    Cited by:  Papers (97)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (230 KB)

    A technique for binary data transmission is described, in which each binary symbol is chosen to be a prescribed superposition of n impulses of form (\sin 2\pi Ft)/2\pi Ft , spaced at intervals 1/2F. Such superposition leads to more than two received levels with binary input, but in return permits realization of the Nyquis... View full abstract»

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  • 20. 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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  • 21. Unique Word Detection in Digital Burst Communications

    Publication Year: 1968, Page(s):597 - 605
    Cited by:  Papers (22)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (759 KB)

    In a satellite time-division multiple-access (TDMA) system, the information is transmitted in bursts from the participating ground stations. In order to establish a time reference in each burst and to determine its origin, special code patterns called unique words (UW) are contained in the bursts. Reliable detection of the UW is the basis for keeping the stations in synchronism and providing high-... View full abstract»

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  • 22. Probabilities of Error for Adaptive Reception of M-Phase Signals

    Publication Year: 1968, Page(s):71 - 81
    Cited by:  Papers (110)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1010 KB)

    Probabilities of error are derived for 2- and 4-phase signaling over an L -diversity branch, time-invariant, additive Gaussian noise channel and for M -phase signaling over an L diversity branch, Rayleigh fading, additive Gaussian noise channel. Both channels corrupt the signaling wavefor... View full abstract»

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  • 23. A Troposcatter Channel Model

    Publication Year: 1969, Page(s):130 - 137
    Cited by:  Papers (28)  |  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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  • 24. Transmission of Multiplexed PAM Signals Over Multiple Channel and Diversity Systems

    Publication Year: 1970, Page(s):520 - 526
    Cited by:  Papers (19)
    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 of M multiplexed PAM signals transmitted over random-time and frequency-dispers... View full abstract»

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  • 25. Filter Distortion and Intersymbol Interference Effects on PSK Signals

    Publication Year: 1971, Page(s):120 - 132
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1164 KB)

    The combined effects of filter distortion and the associated intersymbol interference on coherently detected biphase and quadriphase PSK signals are studied in white Gaussian noise. A determination is made of the system performance degradation from matched-filter detection resulting from the use of a linear channel model that focuses attention on the critical filters in the communication link. The... View full abstract»

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

    Publication Year: 1971, Page(s):188 - 195
    Cited by:  Papers (46)  |  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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  • 27. 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 an n -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 bo... View full abstract»

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

    Publication Year: 1965, Page(s):285 - 292
    Cited by:  Papers (34)  |  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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  • 29. Acquisition of Pseudonoise Signals by Sequential Estimation

    Publication Year: 1965, Page(s):475 - 483
    Cited by:  Papers (89)  |  Patents (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (823 KB)

    A new method of acquisition of pseudonoise signals is described. This method is based on sequential estimation of the present state of an incoming pseudonoise signal by examining a small number of input bits. Performance of the sequential estimation system is compared with the stepping correlation system, and significant improvement of acquisition time is shown for signal-to-noise ratios down to a... View full abstract»

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  • 30. Buffer Design for Data Compression Systems

    Publication Year: 1968, Page(s):606 - 615
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (793 KB)

    Design of the output buffer is one of the most important tasks in implementing an adaptive data compression system. Upon proper design of the buffer including such parameters as size, inputoutput data rates, and occupancy control, rests the overall compression efficiency and error performance of the system. The binomial distribution is used to derive an exact model for a synchronous buffer. The Po... View full abstract»

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  • 31. Mutual Coupling Effect on Maximum-Ratio Diversity Combiners and Application to Mobile Radio

    Publication Year: 1970, Page(s):779 - 791
    Cited by:  Papers (23)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (872 KB)

    The mutual coupling effects on an M -branch maximumratio combiner with correlated signal fading in general are considered. The results in the mobile radio case show that the average power delivered to the receiver becomes less as the antenna spacing of an antenna array decreases (i.e., the mutual coupling increases) with either an optimum load network or an opt... View full abstract»

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  • 32. M-ary Poisson Detection and Optical Communications

    Publication Year: 1969, Page(s):208 - 216
    Cited by:  Papers (48)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (902 KB)

    This paper presents an investigation of the problem of maximum likelihood detection of one of M Poisson processes in a background of additive Poisson noise. When the observables correspond to counts of emitted photoelectrons, the problem models a discrete version of a coherent M -ary optical communication system using photon... View full abstract»

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  • 33. Burst-Correcting Codes for the Classic Bursty Channel

    Publication Year: 1971, Page(s):772 - 781
    Cited by:  Papers (87)  |  Patents (35)
    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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  • 34. Performance of Digital Matched Filter Correlator With Unknown Interference

    Publication Year: 1971, Page(s):1163 - 1172
    Cited by:  Papers (16)  |  Patents (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (888 KB)

    The S/N loss due to amplitude quantization is examined in connection with a digital matched filter correlator for a binary coded signal. A minimax binary quantizing concept is described, which adds an optimized noise dither prior to hard clipping. The design philosophy is minimax; i.e., the loss from an ideal analog correlator is minimized in the presence of the worst interference constrained to a... View full abstract»

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  • 35. Excitation of Higher-Order Antenna Modes by Multipath Propagation

    Publication Year: 1967, Page(s):597 - 603
    Cited by:  Papers (8)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1096 KB)

    Deep fading on microwave line-of-sight radio relay links is known to be caused by two or more rays arriving at the receiving antenna at slightly different angles in the vertical plane. Destructive interference between these rays can produce deep fades (30 dB or more) of the received signal. In the experiment described, it was found that deep fading is often accompanied by strong higher-order mode ... View full abstract»

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  • 36. Error Probabilities Due to Additive Combinations of Gaussian and Impulsive Noise

    Publication Year: 1967, Page(s):471 - 474
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (422 KB)

    In this paper a Poisson impulse noise model is utilized to calculate error probability characteristics of a matched filter receiver operating in an additive combination of impulsive and Gaussian noise. Comparisons of the theoretical predictions are made with experimental data obtained from a simulated communication system. The results indicate that only a small amount of Gaussian noise power has a... View full abstract»

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  • 37. A Variable-Step-Size Robust Delta Modulator

    Publication Year: 1971, Page(s):1033 - 1044
    Cited by:  Papers (30)  |  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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  • 38. A Flexible High-Speed Sequential Decoder for Deep Space Channels

    Publication Year: 1971, Page(s):813 - 820
    Cited by:  Papers (12)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (733 KB)

    This paper describes a sequential decoding machine built at the Jet Propulsion Laboratory (JPL), which uses a 3-bit quantization of the code symbols and achieves a computation rate of MHz. This machine is flexible and can be programmed to decode any complementary convolutional code with rates down to 1/4 and contraint lengths up to 32. In addition, metric programmability is provided for optimizati... View full abstract»

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  • 39. Storage and Switching Circuits for an Electronic Telephone System

    Publication Year: 1965, Page(s):5 - 13
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (805 KB)

    Sonic wire delay lines are used for the storage functions and transistor switching circuits for the logic functions comprising the common control of this electronic telephone switching system. Because only short-term storage of transient information (identity of the two parties during a telephone conversation) is required, sonic delay lines are uniquely suitable as storage elements. The use of mod... View full abstract»

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  • 40. Image Coding by Adaptive Block Quantization

    Publication Year: 1971, Page(s):957 - 972
    Cited by:  Papers (39)  |  Patents (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2592 KB)

    A new source encoder called the adaptive block quantizer is proposed for coding data sources that emit a sequence of correlated real numbers with known first- and second-order statistics, Blocks of source output symbols are first classified and then block quantized in a manner that depends on their classification. The system is optimized relative to both the mean square error and the subjective qu... View full abstract»

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  • 41. Discrete-Time Least Squares, Minimum Mean Square Error, and Minimax Estimation

    Publication Year: 1966, Page(s):302 - 308
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (522 KB)

    A discrete-time signal estimation problem in which the input signal is represented by an expansion in terms of linearly independent functions is considered. After a set of r noisy measurements of the signal are made, a linear estimator of the function and/or its derivatives at some point in time, τ, is required. Due to systems or physical considerations o... View full abstract»

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  • 42. An Analysis of the Capabilities of Polybinary Data Transmission

    Publication Year: 1965, Page(s):312 - 319
    Cited by:  Papers (9)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (783 KB)

    The capabilities of the polybinary technique for transmission of digital data in absolutely band-limited channels are evaluated by analysis and experiment. Relative bit rates and probabilities of error per bit are used to compare the various polybinary systems with each other and with the more conventional multilevel techniques of data transmission. It is concluded that duobinary transmission can ... View full abstract»

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  • 43. A Rake System for Tropospheric Scatter

    Publication Year: 1966, Page(s):499 - 506
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (749 KB)

    Experimental equipment has been developed which adapts the Rake concept to tropospheric scatter. This equipment enables experimental tests of multipath diversity effectiveness for communications. Its delay-resolution capabilities and circuit stability also allow effective use of the equipment for novel propagation research. The underlying concepts and equipment design are described, along with ini... View full abstract»

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  • 44. Comparisons of Error Control Techniques

    Publication Year: 1964, Page(s):146 - 154
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (734 KB)

    The performance capabilities of several retransmission systems are compared with each other and with conventional errorcorrecting codes in hypothetical channels exhibiting independent or dependent errors. These evaluations are based on the analysis in the companion paper which admits errors in the feedback channel and undetectable errors in either channel. The basic problem of deciding whether to ... View full abstract»

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  • 45. Random FM in Mobile Radio with Diversity

    Publication Year: 1971, Page(s):1259 - 1267
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (687 KB)

    The probability density function and autocorrelation function of random FM in a mobile radio system are derived for the case where postdetection selection diversity is used. Closed-form solutions for the autocorrelation function have been found for no diversity and two-branch diversity and infinite series expansions for higher orders. The use of two-branch selection diversity is shown to reduce th... View full abstract»

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  • 46. On the Probability of Error for Multichannel Reception of Binary Signals

    Publication Year: 1968, Page(s):68 - 71
    Cited by:  Papers (34)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (325 KB)

    In this paper a derivation of the probability of error which arises in 1) adaptive multichannel reception of binary signals and 2) multichannel communication with binary signaling over channels that are characterized by both a specular (nonfading or constant) component and a Rayleigh fading component is presented. View full abstract»

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  • 47. Image Coding by Linear Transformation and Block Quantization

    Publication Year: 1971, Page(s):50 - 62
    Cited by:  Papers (105)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1837 KB)

    The feasibility of coding two-dimensional data arrays by first performing a two-dimensional linear transformation on the data and then block quantizing the transformed data is investigated. The Fourier, Hadamard, and Karhunen-Loève transformations are considered. Theoretical results for Markov data and experimental results for four pictures comparing these transform methods to the standard me... View full abstract»

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  • 48. The Raisting Satellite Earth Station and Its System Noise Temperature

    Publication Year: 1967, Page(s):848 - 854
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (856 KB)

    Features of the German satellite earth station at Raisting are cited in this paper. One essential criterion, the noise performance, is discussed in particular. The 25-meter Cassegrain antenna with horn reflector feed (covered by a radome) has been subjected to extended measurements of the system noise temperature. The results show the relation between the system noise temperature and the antenna e... View full abstract»

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  • 49. Design Studies for Reliable Long-Range Ground-to-Air Communication

    Publication Year: 1967, Page(s):680 - 689
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1062 KB)

    Design parameters of UHF/VHF ground-to-air communication systems are discussed with particular reference to propagational reliability. Included are results of some flight trials made over Western Europe using UHF transmissions to four different ground locations with the object of studying the repeatability of signals and effect of different terrain conditions. These experiments were performed unde... View full abstract»

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  • 50. Design of Block-Coded Communication Systems

    Publication Year: 1967, Page(s):525 - 534
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (757 KB)

    The design and performance of frequency multiplexed, phase-modulated communication systems is presented. In particular, the transmitter is assumed to be an ideal phase modulator which modulates a RF carrier with N phase-modulated, sinusoidal data subcarriers, and in general, M binary-valued composite signals. The receiver is... 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