IEEE Transactions on Communications

Issue 10  Part 1 • October 1979

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

    Publication Year: 1979, Page(s): 0
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  • Introduction and Overview

    Publication Year: 1979, Page(s):1377 - 1380
    Cited by:  Papers (1)
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  • Experimental Program and Performance of Japan's Communication Satellite (CS) and Its First Results

    Publication Year: 1979, Page(s):1392 - 1405
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1321 KB)

    Japan's CS spacecraft was launched successfully in December 1977 and placed at 135°E longitude in a geostationary orbit. On-orbit performance of the satellite was verified quite well with the exception of two sets ofK-band transponders. Substantial communication experiments have been conducted for more than half a year starting in May, 1978. In the satellite loop-back configuration... View full abstract»

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  • Multilevel SCPC System Design

    Publication Year: 1979, Page(s):1441 - 1448
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (742 KB)

    A method of assigning carrier levels in an SCPC system with mixed earth stationG/Tsis developed which optimizes system performance for uniformly spaced and randomly assigned carrier frequencies. The optimum transponder backoff is shown to be identical to that for a system of uniform carriers in which the (common) earth station(G/T)^{-1}is a weighted average of the different View full abstract»

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  • An Efficient SS/TDMA Time Slot Assignment Algorithm

    Publication Year: 1979, Page(s):1449 - 1455
    Cited by:  Papers (166)  |  Patents (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (768 KB)

    This paper presents an efficient time slot assignment algorithm for an SS/TDMA system. The technique utilized in the algorithm is a systematic method of finding distinct representatives from the row sets of a traffic matrix. The assignment efficiency resulting from the algorithm is 100% for any traffic matrix. The number of switching modes generated by the algorithm is bounded byn^{2} - 2n + ... View full abstract»

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  • Satellite Packet Communication - Multiple Access Protocols and Performance

    Publication Year: 1979, Page(s):1456 - 1466
    Cited by:  Papers (35)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1245 KB)

    Satellite communication systems have traditionally been designed for voice traffic. Multiple access protocols for conflict resolution have typically been channel-oriented with either fixed or demand assignment. Data communications, however, have much more diverse traffic characteristics and transmission requirements than voice communications. We present in this paper an overview of two major categ... View full abstract»

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  • Generalized TDMA: The Multi-Accessing Tree Protocol

    Publication Year: 1979, Page(s):1476 - 1484
    Cited by:  Papers (113)  |  Patents (44)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (897 KB)

    The tree algorithm, a new basic protocol for accessing a satellite channel by a large number of independent users, is considered. Previous multi-accessing techniques suffered from long delays, low throughput and/or congestion instabilities. The ALOHA algorithm, for example, when applied to the Poisson source model, has a maximum throughput of .37 packets/slot and is unstable. The tree protocol, un... View full abstract»

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  • TACS - A Demand Assignment System for FLEETSAT

    Publication Year: 1979, Page(s):1484 - 1496
    Cited by:  Papers (1)  |  Patents (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1724 KB)

    The UHF FLEETSATCOM system provides a substantial resource to support important communication needs of the U.S. Navy and other Department of Defense users. Because of the significant investment being made in this system, there is strong motivation to examine techniques that make efficient usage of its components. This paper reports on one such effort, the Terminal Access Control System (TACS) that... View full abstract»

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  • Receiver Windowing for FDM MFSK Signals

    Publication Year: 1979, Page(s):1519 - 1527
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (840 KB)

    Frequency division multiplexed, orthogonalM-ary FSK modulated signals transmitted over a frequency hopping channel (with one channel use per hop) interfere with each other unless perfectly synchronized in time and frequency with the receiver. In order to maintain the interfering "crosstalk" energy at harmless levels, even in the case of grossly power unbalanced users, the frequency sepa... View full abstract»

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  • Saddle Point Approximation for the Error Probability in PAM Systems with Intersymbol Interference

    Publication Year: 1979, Page(s):1604 - 1609
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    An easily computed, closed form expression in terms of the saddle point location is used to approximate the error probability, and tight bounds are derived. For the Chebyshev pulse with 10 interferers, the approximation was within 1% for error Probabilities<10^{-6}. With 80 interferers, upperbound/lower bound was about 1.1 at SNR = 16 dB. View full abstract»

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  • Power Spectrum of Binary FM Signal with Additional AM

    Publication Year: 1979, Page(s):1609 - 1616
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (626 KB)

    Formulas are derived for the power spectral density function of a sinusoidal carrier, frequency modulated by a random baseband pulse train in which the signaling interval equalsT. The signal pulses of duration2Toverlap. In the analysis presented different shapes of the signal pulses are approximated by staircase functions. Variations of the instantaneous frequency of the bina... View full abstract»

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  • Correction to "The introduction of digital switching to the local network"

    Publication Year: 1979, Page(s): 1634
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (108 KB)

    First Page of the Article
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  • [Back cover]

    Publication Year: 1979, Page(s): 0
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    Freely Available from IEEE
  • Phase Coherency in Tracking and Data Relay Satellites

    Publication Year: 1979, Page(s):1527 - 1537
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1088 KB)

    In systems employing relay satellites there is invariably a strict requirement for maintaining frequency and phase coherence throughout the system. Although frequency lock can generally be attained by tracking loops and Doppler correction, phase coherency is often destroyed by phase noise, frequency offsets, and differential phase shifts. To evaluate the degree of phase instability, and its effect... View full abstract»

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  • Input Power Assignment of Multicarrier Systems from Given Output Power Levels

    Publication Year: 1979, Page(s):1577 - 1584
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (720 KB)

    A problem associated with signal power control during multicarrier transmission in the presence of an amplifier nonlinearity in a satellite communications channel is analyzed. The problem is to calculate input carrier power levels wheii output carrier power levels are given. The Fletcher-Powell optimization technique is used for a small number of transmitted carriers, and an example shows the effe... View full abstract»

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  • Polarization Control Schemes For Satellite Communications with Multiple Uplinks

    Publication Year: 1979, Page(s):1504 - 1512
    Cited by:  Papers (1)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (872 KB)

    Orthogonal polarizations will be more and more widely used in satellite communications in the near future because of their efficiency in utilizing the spectrum, but the currently designed compensation control systems can compensate for signals coming from only one uplink station. This paper therefore discusses generally the control schemes feasible to solve the multiple Uplink problem, in which th... View full abstract»

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  • Effective Utilization of Geostationary Orbit Through Optimization

    Publication Year: 1979, Page(s):1551 - 1558
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (712 KB)

    The limitation in the effective use of the geostationary orbit is the intersatellite interference problem. A theoretical approach to realize an optimal usage of the orbit is provided in this paper, with particular attention to the constraints of service arcs, existence of spotbeam operating systems and different frequency plannings. The problem is formulated as a nonlinear programming problem and ... View full abstract»

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  • A 100 Mbit/s Prototype MSK Modem for Satellite Communications

    Publication Year: 1979, Page(s):1512 - 1518
    Cited by:  Papers (6)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (728 KB)

    Minimum Shift Keying (MSK) is a very attractive modulation and demodulation scheme for satellite communication systems. In this paper, the design, analysis, implementation, and testing of a high-speed MSK modem are described. This MSK modem has a nominal data transmission rate of 100 Mbits/s at an intermediate frequency of 1.7 GHz, and is designed with a new technique which is named "clock-slave c... View full abstract»

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  • A Novel Concept for a Hybrid 140 Mbit/s System

    Publication Year: 1979, Page(s):1584 - 1593
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1136 KB)

    In this paper it is shown that non-linear equalization by decision feedback offers such a large advantage in signal-to-noise ratio and bandwidth economy that a hybrid binary 140 Mbit/s system is possible with compatibility in repeater spacing in existing European ternary regenerative systems. A large number (60) of analog sections can be connected in tandem. Hardware models of analog and digital s... View full abstract»

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  • A Satellite System with Limited-Scan Spot Beams

    Publication Year: 1979, Page(s):1406 - 1415
    Cited by:  Papers (13)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1048 KB)

    A satellite system with several independent spot beams is considered, wherein each spot beam can be scanned over a limited portion of some large service region. The spectral band is totally reused in each spot beam, thereby providing high system capacity. Such a system combines the high antenna gain advantages of a fixed beam system while providing access to the satellite from any point within the... View full abstract»

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  • Regulatory and Technical Factors in Geostationary Orbit Utilization

    Publication Year: 1979, Page(s):1544 - 1550
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (824 KB)

    The geostationary orbit can accommodate only a finite number of satellites using any given frequency band. Technological development has made certain space bands very popular and has given rise to potential crowding. This article discusses the interplay of technical, operational and administrative factors in relation to orbit use. View full abstract»

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  • Baseband Processing in a High-Speed Burst Modem for a Satellite-Switched TDMA System

    Publication Year: 1979, Page(s):1496 - 1503
    Cited by:  Papers (3)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (880 KB)

    We present block diagram designs for the baseband processing modules required to implement high-speed (600 Mbit/s) burst modems for use in TDMA satellite systems. Our main concern is to obtain designs which can be implemented with a minimum of high-speed (ECL) devices so as to reduce design and hardware costs. A major consideration in the modem operation is to accurately synchronize it to a refere... View full abstract»

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  • Analysis of Direct-Sequence Spread-Spectrum Multiple-Access Communication Over Rician Fading Channels

    Publication Year: 1979, Page(s):1566 - 1577
    Cited by:  Papers (108)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1024 KB)

    This paper is concerned with the performance of biphase direct-sequence spread-spectrum multiple-access communication for a general class of fading channels. The channels considered are those for which the channel output consists of a strong stable specular signal plus a faded version of this signal. Such channels, which are referred to as Rician fading (or Rice fading) or specular-plus-Rayleigh f... View full abstract»

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  • Efficient Packet Satellite Communications

    Publication Year: 1979, Page(s):1416 - 1422
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    This paper gives an extensive analysis of a Packet satellite (PACSAT) communications system that uses a digital processing satellite in a packet data network. It is shown that multiple uplinks coupled with on-board switching and storage can provide significant gains in throughput, efficiency, and margin against instability. Design tradeoffs are presented and the theoretical results are verified by... View full abstract»

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  • Direct Digitally Controlled Network Synchronization

    Publication Year: 1979, Page(s):1561 - 1565
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    This paper describes a computer based, time discrete frequency regulator for network synchronization of digital telephone exchanges. All the known concepts for synchronization may be achieved after suitable manipulation of a few constants in the Control program. Some results of experiments are also reported upon. View full abstract»

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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