IEEE Transactions on Communications

Issue 5 • May 1975

Filter Results

Displaying Results 1 - 16 of 16
  • [Front cover and table of contents]

    Publication Year: 1975, Page(s): 0
    Request permission for commercial reuse | PDF file iconPDF (157 KB)
    Freely Available from IEEE
  • Decision-Directed Automatic Gain Control for MAPSK Systems

    Publication Year: 1975, Page(s):510 - 517
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (734 KB)

    An automatic gain control (AGC) loop is presented for use withM-ary amplitude- and phase-shift keying (MAPSK) systems. The gain control amplifier is regulated by an error signal formed by the difference between the estimated amplitude level and the received amplitude level. The AGC performance is thus independent of the short-term average received signal energy. AGC loop analysis and si... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Error Detection in the Presence of Synchronization Loss

    Publication Year: 1975, Page(s):538 - 539
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (267 KB)

    Cyclic codes are very attractive for error detection because of their low cost encoding and decoding circuits, and because of their high guaranteed minimum distance, but they suffer from very poor protection when word frame synchronization is lost. This note suggests starting the encoder and decoder circuits in an essentially random state, instead of the usual all-zero state. Under this condition ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Recursive Equalization in Data Transmission - A Design Procedure and Performance Evaluation

    Publication Year: 1975, Page(s):546 - 550
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (509 KB)

    A design procedure for the receiver of a pulse amplitude modulation system is developed for data transmission in the presence of intersymbol interference and noise. In the receiver, an estimate of each source symbol is made based on the WienerKolmogorov theory of minimum variance estimation for stationary time series. The resulting structure is called a recursive equalizer and its taps are obtaine... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Reduction of Edge Busyness in Delta Modulation

    Publication Year: 1975, Page(s):550 - 554
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (475 KB)

    Edge busyness in delta modulation (AM) is analyzed theoretically and a method of reducing edge busyness is presented. By assuming a simple model for quantizing error waveforms, a theoretical signal-to-edge noise ratio is derived as a function of signal slope. It is shown that more than 10-dB edge-busyness reduction can be achieved by limiting input signal slope to about 80 percent of theDelta... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • PSK Combiners for Fading Microwave Channels

    Publication Year: 1975, Page(s):554 - 558
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (493 KB)

    The signal-to-noise(S/N)ratio of digital signals can be improved by using diversity transmission, followed by combining at the receive end, resulting in a lower probability of errorP(e). Second-order combining schemes for data signals are presented in this paper. The effect of delay difference in the two channels of a diversity system is analyzed, using four-phase coherent, p... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Comments on "A Fast Recursive Algorithm to Calculate the Reliability of a Communication Network"

    Publication Year: 1975, Page(s): 563
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (111 KB)

    In the above paper, a procedure is described that determines the probability that all communication paths between two nodes in a network are interrupted. The problem is solved by recursively splitting the original problem into smaller subproblems. In this correspondence, we demonstrate that in certain classes of networks identical subproblems have to be solved several times. Thus the efficiency of... View full abstract»

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

    Publication Year: 1975, Page(s): 0
    Request permission for commercial reuse | PDF file iconPDF (249 KB)
    Freely Available from IEEE
  • A Binary Noncoherent Frequency-Shift-Keying (NCFSK) Multiple-Message One-Shot Radio Transmission System that Uses a Sync Preamble

    Publication Year: 1975, Page(s):501 - 509
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (904 KB)

    A binary noncoherent frequency-shift-keying (NCFSK) multiple-message one-shot radio transmission system is discussed where the receiver has no prior knowledge of the possible starting time of transmission. In this system each transmitted signal has a common preamble for signal acquisition and self-synchronization purposes. System design procedures are described for allowable frequency of occurrenc... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Error Rate Lower Bounds for Digital Communication with Multiple Interferences

    Publication Year: 1975, Page(s):539 - 543
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    This paper presents simple and general lower bounds for error rates in digital communication systems. The information bearing signal is taken to be impaired by additive interference and carrier phase jitter. The former is taken to be composed of two components; one component is peak-limited while the other is not. Intersymbol and cochannel interference are examples of peak-limited interference whi... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Detection of Fast, Noncoherent, Frequency-Hopped FSK

    Publication Year: 1975, Page(s):543 - 546
    Cited by:  Papers (6)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    As technology becomes increasingly able to meet the requirements, interest in faster, noncoherent, frequency-hopping rates to reduce detectability of communications has heightened. The question of what dectect on method is to be used for transmissions which have been frequency-hopped at a rate faster than the data rate thus arises. This concise paper presents the derivation of the optimum detector... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Design of Transponder Signals and Recievers for Automatic Vehicle Location and Identification Systems

    Publication Year: 1975, Page(s):489 - 500
    Cited by:  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1272 KB)

    Systems which locate and identify moving vehicles without the active cooperation of either the vehicle operator or its passengers are being considered for various applications, including identification and subsequent billing for vehicles passing toll booths, and location and identification of railroad locomotives. This paper considers the design of identification signals transmitted from (to) a mo... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Television Transmission Performance of an Experimental Small Aperture Earth Station

    Publication Year: 1975, Page(s):558 - 562
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (576 KB)

    The background for the characterization of small aperture earth stations suitable for use in a proposed U.S. Domestic System is described and system considerations for transmission performance given. Three experimental stations were constructed and extensively tested to demonstrate the key features required. Test results are given for antenna gain, noise, station G/T, and television transmission p... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Simple Method for Reliability Evaluation of a Communication System

    Publication Year: 1975, Page(s):563 - 566
    Cited by:  Papers (51)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    Very few techniques exist for reliability evaluation of communication systems where links as well as nodes have certain probability of failure. This correspondence describes a technique by which the reliability expression for such a system can be conveniently derived. It is also shown that using the concept of this correspondence, it is possible to extend all the existing reliability-evaluation al... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Bit Error Rate Monitor for Digital PSK Links

    Publication Year: 1975, Page(s):518 - 525
    Cited by:  Papers (6)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (808 KB)

    This study is concerned with the problem of monitoring the performance of communication links, as indicated by bit error rate, with the objective of detecting as rapidly as possible failures or extreme degradation caused by any source. The monitoring method is based on the use of an artificial threshold for the decision variable and the generation of a measurable "pseudoerror." The study relates p... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The Calculation of Ionospheric Doppler Spread on HF Communication Channels

    Publication Year: 1975, Page(s):526 - 537
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1224 KB)

    Using some basic concepts of ionospheric propagation, multipath and Doppler spread calculations are obtained for the HF ionospheric communication channel. Because of sensitivity to the solar control mechanism, the Doppler spread results are found to demonstrate a pronounced dependence on time of day and operating frequency. The practical consequences of these calculations are discussed in detail. ... 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