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IEEE Transactions on Communication Technology

Issue 5 • October 1970

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Displaying Results 1 - 25 of 36
  • [Front cover and table of contents]

    Publication Year: 1970, Page(s): 0
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    Freely Available from IEEE
  • A Systematic Design Procedure for Modular Stored-Program Telephone Switch Control Organizations

    Publication Year: 1970, Page(s):457 - 466
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1171 KB)

    To overcome many difficulties besetting the design of a cost-effective stored-program telephone switch control, this paper proposes a systematic three-step approach: 1) selection from twelve basic subclasses of a software organization satisfying flexibility, reliability, and speed-of-service constraints; 2) estimation of program size and processing load assuming a rudimentary processor architectur... View full abstract»

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  • Analysis of a System of Mutually Synchronized Oscillators

    Publication Year: 1970, Page(s):467 - 483
    Cited by:  Papers (15)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1211 KB)

    An analysis of the performance of a synchronous digital communications system in which the clock rate of each station is established as the average of the clock rates of all incoming signals to each station is presented. Using both-end control, the system frequency is the average of the free-running frequencies of the phase locked oscillators, weighted by the number of inputs to each station. In s... View full abstract»

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  • Optimally Invulnerable Directed Communication Networks

    Publication Year: 1970, Page(s):484 - 489
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (555 KB)

    Algorithms are given to synthesize optimally invulnerable directed graphs with an arbitrary number of vertices and a minimum number of branches. We give a decomposition of these graphs into a class of subgraphs called step- l cycles, of which a directed Hamilton cycle is a special case. The use of this property in simultaneous View full abstract»

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  • Data Transmission over FDM/FM Troposcatter Systems

    Publication Year: 1970, Page(s):490 - 501
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1137 KB)

    There are more than one hundred troposcatter systems of various sizes in existence all over the world [1]. As the transmission of computer data becomes more and more common and in popular demand, such systems are certain to be involved in these services. Two methods are generally used for transmitting data over troposcatter channels: direct transmission and the frequency division multiplex/frequen... View full abstract»

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  • Analysis and Design of Survivable Networks

    Publication Year: 1970, Page(s):501 - 519
    Cited by:  Papers (77)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1841 KB)

    The problem of designing networks that can survive an enemy attack or natural disaster has received considerable attention in recent years. Work in this area has focused on the formulation of survivability criteria, the development of analysis methods to rank networks with respect to these criteria, and the generation of networks which are optimal with respect to these criteria. Many partial resul... View full abstract»

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

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

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

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  • Performance Characteristics of Adaptive/Self-Synchronizing PSK Receivers Under Common Power and Bandwidth Conditions

    Publication Year: 1970, Page(s):527 - 536
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (872 KB)

    An analytical and numerical investigation of the performance characteristics of partially coherent system techniques which consist of 1) the squaring-tracking loop, 2) the pilot-tone tracking loop, and 3) the differential phase-shift keying (DPSK) technique is discussed. Performance characteristics (error probabilities) are obtained under a unified receiving systems framework, with commonality exp... View full abstract»

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  • Measurements of Path Intermodulation Distortion over Five Tropospheric Scatter Paths

    Publication Year: 1970, Page(s):537 - 543
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (622 KB)

    Path intermodulation (IM) data was derived from noise power ratio measurements taken over five tropospheric scatter paths during system acceptance tests. Path lengths of the five links range from 176 to 515 miles, and the links are operated at frequencies of 600 MHz, 900 MHz, or 2 GHz. Path locations vary from a subtropical environment to overland paths near the Arctic circle. The data is presente... View full abstract»

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  • A Comparison of Modulation Techniques for Quantized Voice Communications

    Publication Year: 1970, Page(s):543 - 550
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (842 KB)

    Using the requirements of a quantized multiple access voice communications system as a base, an investigation of several methods of modulation was conducted. Two frequency modulation (FM) techniques and one amplitude modulation (AM) technique were investigated in detail. The AM technique is the quantized pulse position modulation-AM (QPPM-AM) method used in the U. S. Army random access-discrete ad... View full abstract»

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  • Diversity Performance of the Wide-Band FSK System in a Three-Component Two-Path Channel

    Publication Year: 1970, Page(s):551 - 562
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1060 KB)

    In several space relay communication channels signal energy can be described as following two transmission paths. The first is the direct path from the transmitter to the receiver in which the signal is corrupted only by additive Gaussian noise. The second is the reflected path involving a reflection boundary, which may distort and delay the signal in that path. At the receiver the combined signal... View full abstract»

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  • Asynchronous Transmission Schemes for Digital Information

    Publication Year: 1970, Page(s):562 - 568
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (766 KB)

    Some coding schemes of binary signals into ternary signals for asynchronous transmission of digital information are presented. First, an application of differentiated ternary return to zero signals, where every signal is associated with a particular separation signal, to asynchronous transmission is introduced and discussed. Second, coding schemes where successive signals are alike are introduced ... View full abstract»

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

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

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

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

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

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

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  • Envelope Fluctuations in the Output of a Bandpass Limiter

    Publication Year: 1970, Page(s):597 - 605
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (657 KB)

    The bandpass limiter is a key component in many communication systems. It is useful to model a bandpass limiter as a cascade combination of a hard limiter and a bandpass filter. If a bandpass signal is input to a bandpass limiter, the output of the hard limiter will be concentrated in an infinite number of spectral bands centered at odd multiples of the input center frequency (fundamental). If the... View full abstract»

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  • Subsequences of Pseudorandom Sequences

    Publication Year: 1970, Page(s):606 - 612
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (710 KB)

    The properties of subsequences of long m sequences are studied using the moments of the subsequence weight distributions. These moments are shown to be an aid for selecting good m sequences for correlation-detection problems. In particular, the first four moments are described in detail for subsequence lengths View full abstract»

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  • Buffer Behavior for Batch Poisson Arrivals and Single Constant Output

    Publication Year: 1970, Page(s):613 - 618
    Cited by:  Papers (50)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (516 KB)

    A queuing model with limited waiting room (buffer), batch (burst) Poisson arrivals, and a synchronous server (transmission channel) with constant service time (constant transmission rate) is studied. Using average burst length and traffic intensity as parameters, the relationships among buffer size, overflow probabilities, and an approximation to the expected queuing delay of each burst due to buf... View full abstract»

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  • An All-Digital Multichannel Narrow-Band FSK Data Receiver

    Publication Year: 1970, Page(s):619 - 624
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (471 KB)

    The advent of large-scale integration has suggested new approaches to signal processing problems. In the data transmission field, for example, a complete modem can be built entirely of digital circuits. Not only is this approach technically feasible, but it is economically attractive, if the inherent speed of the digital devices is utilized by time-sharing the hardware among a large number of chan... View full abstract»

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  • Decision-Directed Digital Adaptive Equalization Technique for High-Speed Data Transmission

    Publication Year: 1970, Page(s):625 - 632
    Cited by:  Papers (117)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (721 KB)

    The digital adaptive equalization technique presented is characterized by a relatively simple algorithm and unique design features that permit fast adaptation in the decision-directed mode. For example, at 4800 bit/s the initial error rate in this mode may be as high as 25 percent, yet adaptation is assured. The equalization process is applied to the modified duobinary technique, but the principle... View full abstract»

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  • Frequency Modulation Using Digital Filtering Techniques

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

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

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  • A Real Time Processor for the Control of an All-Digital Multiline Data Set

    Publication Year: 1970, Page(s):637 - 645
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (837 KB)

    A sequential circuit for the control of an all-digital multiline data set is presented. Such a circuit, operating in conjunction with a digital modulator and demodulator, is necessary to provide the scanning, timing, display, and interface control features associated with the exchange of information between m voice-band communication channels and their associa... View full abstract»

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  • Data Terminal Control and Partial Retransmission by Mini-Computer

    Publication Year: 1970, Page(s):646 - 650
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (446 KB)

    Described is the use of a mini-computer for the communication control procedures, error detection, and data buffering of one to four on-line data terminals. The interface hardware is general and minimal. The character synchronization and control logic is done by software. An error correction scheme of partial record retransmission is developed. The resulting thruput is compared to that of the Idle... View full abstract»

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  • 140-MHz IF Main Amplifiers for 2700-Channel Microwave Repeaters

    Publication Year: 1970, Page(s):651 - 662
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (904 KB)

    A gain controlled amplifier capable of transmitting 2700 channels is presented. In the 2700-channel radio relay system, the intermediate frequency (IF) was selected at 140 MHz. An IF main amplifier was required to handle approximately +14 dBm and to realize low distortion-gain control circuits. Conventional variolossers using semiconductor devices induce many harmonics and amplitude modulation-pha... View full abstract»

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  • Subjective Evaluation of Dedicated Multiple-Hop Satellite Communications for Government and Military Users

    Publication Year: 1970, Page(s):663 - 672
    Cited by:  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (856 KB)

    Acceptability of telephone communications over a circuit which included two synchronous orbit satellite links in tandem is the primary subject presented. Round trip delay in the order of 1100 ms was caused by such a circuit, and the question studied was this: wall this phenomenon cause actual users to rate the circuit unacceptable? The users consisted of military and civilian government personnel ... View full abstract»

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  • Output Signal-to-Noise Ratio of an FM Discriminator with Nonideal Limiting

    Publication Year: 1970, Page(s):673 - 676
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (343 KB)

    Approximate expressions are calculated for the output signal-to-noise ratios of a balanced frequency discriminator and an unbalanced frequency discriminator. The input is a frequency modulated signal embedded m white Gaussian noise. Nonideal limiting is assumed. The results obtained are valid in the above-threshold region of operation. 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