By Topic

IEEE Transactions on Communications

Issue 8 • Date August 1977

Filter Results

Displaying Results 1 - 22 of 22
  • [Front cover and table of contents]

    Publication Year: 1977, Page(s): 0
    Request permission for commercial reuse | PDF file iconPDF (170 KB)
    Freely Available from IEEE
  • Introduction: Special Issue on Spread Spectrum Communications

    Publication Year: 1977, Page(s):745 - 747
    Cited by:  Papers (8)
    Request permission for commercial reuse | PDF file iconPDF (353 KB)
    Freely Available from IEEE
  • Performance Evaluation for Phase-Coded Spread-Spectrum Multiple-Access Communication - Part I: System Analysis

    Publication Year: 1977, Page(s):795 - 799
    Cited by:  Papers (1202)  |  Patents (23)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (473 KB)

    An analysis of an asynchronous phase-coded spread-spectrum multiple-access communication system is presented. The results of this analysis reveal which code parameters have the greatest impact on communication performance and provide analytical tools for use in preliminary system design. Emphasis is placed on average performance rather than worst-case performance and on code parameters which can b... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Performance Evaluation for Phase-Coded Spread-Spectrum Multiple-Access Communication - Part II: Code Sequence Analysis

    Publication Year: 1977, Page(s):800 - 803
    Cited by:  Papers (175)  |  Patents (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (413 KB)

    An analysis of the code sequence parameters that are most important to the communication performance of an asynchronous phase-coded spread-spectrum multiple-access communication system is presented. Previously known bounds and computational techniques for such parameters are surveyed. Some new results on mean-square correlation are included. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • [Back cover]

    Publication Year: 1977, Page(s): 0
    Request permission for commercial reuse | PDF file iconPDF (524 KB)
    Freely Available from IEEE
  • Computer-Aided Spread Spectrum Signal Design

    Publication Year: 1977, Page(s):861 - 867
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (672 KB)

    The calculations required in the formulation of surface acoustic wave device signals have been removed from the design process into a large-scale digital computer. The designer is left to trade off application-critical signal characteristics while the computer presents the alternatives and controls fabrication of the interdigital transducers. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Software Implementation of a PN Spread Spectrum Receiver to Accommodate Dynamics

    Publication Year: 1977, Page(s):832 - 840
    Cited by:  Papers (23)  |  Patents (43)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (840 KB)

    To optimize the threshold of a pseudonoise (PN) spread spectrum modem for use over an aircraft/satellite communications link at SHF, the effects of Doppler must be taken into account. Reconstitution of carrier phase by a Costas loop to coherently demodulate the PSK data and also the delay-lock error voltage has typically been the practice in PN modems intended for ground applications. To accommoda... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Spread Spectrum and Time Division Multiple Access Satellite Communications

    Publication Year: 1977, Page(s):810 - 815
    Cited by:  Papers (6)  |  Patents (54)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (664 KB)

    Although time division multiple access (TDMA) satellite communication provides the highest traffic capacity per satellite and offers efficient transmission of a wide variety of services, it suffers from network timing and ranging requirements and message security. On the other hand, spread spectrum multiple access (SSMA) satellite communication is suited for reliable random access and tactical tra... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Spread Spectrum Multiple Access Communications Experiment Through a Satellite

    Publication Year: 1977, Page(s):853 - 856
    Cited by:  Papers (7)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    The purpose of this paper is to demonstrate that spread spectrum performance characteristics under different conditions of limiting and audio channel SNR degradation with close separation of carrier frequencies are similar to that of sinusoidal signals. Experiments also show that simultaneous transmission of acceptable spread spectrum and TV signals are feasible. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The Spread Spectrum Concept

    Publication Year: 1977, Page(s):748 - 755
    Cited by:  Papers (78)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (760 KB)

    This paper describes an idealized spread-spectrum communication system. The processing gain concept is developed as a measure of a well-designed system's robust performance against independent wide-sense stationary interference. Multipath and repeater jammer rejection, partial correlation problems, and security requirements are related to spread-spectrum code properties. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Implementing Spread Spectrum Technology in the Land Mobile Radio Services

    Publication Year: 1977, Page(s):867 - 869
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    A spread spectrum technique is described which, when applied to the mobile radio cellular communication system, is seen to provide very substantial improvements over what can be achieved through the use of conventional modulation and spectrum accessing techniques. The expanded capabilities include an extremely large number of unique individual addresses probably sufficient for all foreseeable grow... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Optimum Design and Performance of Costas Recievers Containing Soft Bandpass Limiters

    Publication Year: 1977, Page(s):822 - 831
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (736 KB)

    This paper investigates several key questions concerning the mechanization and design of a Costas receiver for reconstruction of a carrier from a suppressed carrier signal. For baseband NRZ encoded data symbols and a soft bandpass limiter preceding the loop, several design issues which are considered herein and which affect acquisition and tracking performance are: (1) The choice of an IF bandwidt... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Spread Spectrum Receiver Using Surface Acoustic Wave Technology

    Publication Year: 1977, Page(s):841 - 847
    Cited by:  Papers (40)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (928 KB)

    In this paper, various potential implementations of spread spectrum systems using surface acoustic wave (SAW) devices are discussed and experimental results for a phase-shift keyed (PSK) signal embedded in unwanted interference is presented. An overview of acoustic surface wave technology as it applies to signal processing in spread spectrum communication systems is presented. The ability to imple... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Error Probability of Asynchronous Spread Spectrum Multiple Access Communication Systems

    Publication Year: 1977, Page(s):803 - 809
    Cited by:  Papers (110)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB)

    Several approaches for the evaluation of upper and lower bounds on error probability of asynchronous spread spectrum multiple access communication systems are presented. These bounds are obtained by utilizing an isomorphism theorem in the theory of moment spaces. From this theorem, we generate closed, compact, and convex bodies, where one of the coordinates represents error probability, while the ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Acquisition of Pseudonoise Signals by Recursion-Aided Sequential Estimation

    Publication Year: 1977, Page(s):784 - 794
    Cited by:  Papers (67)  |  Patents (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1000 KB)

    An improved method of acquisition of pseudonoise signals (RARASE) is described and analyzed. This method is an outgrowth of the RASE method, rapid acquisition by sequential estimation. In the new method, the known recursion relation of the PN signal is used to determine if a short estimate of the state of the received PN signal is probably correct and if, consequently, an attempt should be made to... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Performance Criteria for Spread Spectrum Communications

    Publication Year: 1977, Page(s):756 - 763
    Cited by:  Papers (22)  |  Patents (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (896 KB)

    The criteria for antijam (AJ) and anti-intercept (AI) systems are described, in terms of the appropriate action taken by the jammer or interceptor. Avoiding pseudonoise (PN) sequences which can be partially or totally predicted is a foremost criteria, especially for AJ, and use of nonlinear feedforward logic (NFFL) with long-period linear maximal sequences appears attractive. A frequency-hopping (... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Spread Spectrum Performance Analysis in Arbitrary Interference

    Publication Year: 1977, Page(s):848 - 853
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (632 KB)

    An important application of spread spectrum modulation is to Provide interference immune communications. Generally, the approach to system performance analysis will assume a host of various interference situations with the hope the results give wide applicability, while, based on the concept and properties of pseudo-random spreading waveforms, it is possible to rid the analysis of artificial or re... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Low-Rate Convolutional Code Applications in Spread-Spectrum Communications

    Publication Year: 1977, Page(s):815 - 822
    Cited by:  Papers (23)  |  Patents (29)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (752 KB)

    Low-rate convolutional codes are useful as an interference mitigation technique in frequency-hopped spread-spectrum systems. In this paper we show how good low-rate convolutional codes can readily be constructed from higher-rate codes that are known to exhibit good performance. The performance of low-rate convolutional codes is established theoretically and through the use of computer simulation a... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Optimization of Coded Spread Spectrum System Performance

    Publication Year: 1977, Page(s):763 - 770
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (768 KB)

    Error correction coding techniques significantly improve performance of spread spectrum communication systems in environments containing jamming, multipath, and unregulated multiple access. This paper investigates the optimization of spread spectrum system performance for time-varying unknown interference. Noncoherent frequency hopping (FH) spread spectrum modulation, and hybrid FH-PN incorporatin... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Unified Analysis of Pseudonoise Synchronization by Envelope Correlation

    Publication Year: 1977, Page(s):770 - 778
    Cited by:  Papers (79)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (840 KB)

    The problem of acquiring and maintaining synchronization of a pseudonoise code, particularly at low signal-to-noise ratios, is analyzed to determine the mean time to acquisition and the mean time to lose lock. An analysis procedure is developed which explicitly considers the search/lock strategy and the transition from search to lock. A practical example is included to demonstrate the technique. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Acquisition Time Performance of PN Spread-Spectrum Systems

    Publication Year: 1977, Page(s):778 - 784
    Cited by:  Papers (166)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (640 KB)

    This paper develops the mean and variance of the time to acquire for single dwell time PN-type spread-spectrum systems. A model is specified, and then exact results are obtained by use of the generating function for the acquisition process. The paper is somewhat tutorial in that the analysis technique is developed in a logical step-to-step manner for the Markov chain model and can be readily used ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An Active RC Delay Line for Matched Filters Correlators

    Publication Year: 1977, Page(s):856 - 861
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (576 KB)

    For a matched filter correlator (MFC) required in a spread spectrum receiver, an active RC delay line has been developed and its performance evaluated. The building block of the delay line is a low pass type active RC filter with modifications to give desirable magnitude, phase and pulse response. An MFC processor for a bandwidth expansion of 15 in data communication application has been made usin... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.

Aims & Scope

IEEE Transactions on Communications focuses on all telecommunications including telephone, telegraphy, facsimile, and point-to-point television by electromagnetic propagation.

 

 

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Naofal Al-Dhahir
University of Texas at Dallas