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Communications, IEEE Transactions on

Issue 7 • Date July 1980

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Displaying Results 1 - 24 of 24
  • [Front cover and table of contents]

    Publication Year: 1980 , Page(s): 0
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    Freely Available from IEEE
  • Guest Editor's Prologue: The Thrust of Electronic Systems in the Subscriber Loop Plant

    Publication Year: 1980 , Page(s): 921 - 922
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    Freely Available from IEEE
  • [Back cover]

    Publication Year: 1980 , Page(s): 0
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    Freely Available from IEEE
  • Optimization of the Processing Gain of an FSK-FH System

    Publication Year: 1980 , Page(s): 1062 - 1079
    Cited by:  Papers (25)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (632 KB)  

    It is desired to determine the performance of a noncoherent FSK frequency-hopped spread spectrum communication system using MARK and SPACE tones which are not necessarily orthogonal, and in addition using an error-correction code to reduce the susceptibility of the system to jammer-induced errors. The overall bandwidth of the system (i.e., the spread bandwidth) will be held constant so that the pr... View full abstract»

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  • New Technology for Loops--A Plan for the '80's

    Publication Year: 1980 , Page(s): 923 - 930
    Request Permissions | Click to expandAbstract | PDF file iconPDF (824 KB)  

    This paper describes an evolutionary plan for loop electronics to realize their full economic and service potential, and describes issues of Telco operations, cost, and technical capabilities which must be resolved in the process. Initially, conventional feeder engineering will lead to isolated applications of range extension and pair gain. Some customer premises pair gain terminals will be deploy... View full abstract»

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  • Packet Switching in Radio Channels: New Conflict-Free Multiple Access Schemes

    Publication Year: 1980 , Page(s): 1015 - 1029
    Cited by:  Papers (40)  |  Patents (16)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (1352 KB)  

    We study new access schemes for a population of geographically distributed data users who communicate with each other and/or with a central station over a multiple-access broadcast ground radio packet-switching channel. We introduce and analyze alternating priorities (AP), round robin (RR), and random order (RO) as new conflict-free methods for multiplexing buffered users without control from a ce... View full abstract»

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  • A Queueing Analysis of Two ARQ Protocols

    Publication Year: 1980 , Page(s): 1004 - 1014
    Cited by:  Papers (41)  |  Patents (1)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (744 KB)  

    In every data communication system, a procedure must be provided to allow for the retransmission of data when errors are detected. The receiving node is required to make a (positive/negative) acknowledgment (ACK/NACK) to the sending node. Until an acknowledgment is received, a "copy" of the message must be retained at the sending node. If an ACK is received, the space assigned to the "copy" is rel... View full abstract»

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  • Toward Local Network Digitalization: The View from Japan

    Publication Year: 1980 , Page(s): 956 - 966
    Cited by:  Papers (1)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (1176 KB)  

    This paper describes digital service integration in the local network. Since the local telephone network accounts for a large portion of the total network cost, it is desirable that a single local network be shared by telephone and nontelephone services. This service integration may include shared local switches, shared N \times 64 kbit/s subscriber lines, a... View full abstract»

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  • An Inexpensive Automatic Test System for Remote Supervision of Repeatered Lines

    Publication Year: 1980 , Page(s): 1099 - 1102
    Request Permissions | Click to expandAbstract | PDF file iconPDF (344 KB)  

    Salient features of a novel automatic fault location scheme for remote supervision of repeatered digital transmission lines is discussed. Looping back repeaters in succession by a single command on the power feed line eliminates the use of a separate supervisory cable pair. The scheme has been generalized in such a way as to facilitate its adoption to almost all type of repeaters, thus providing a... View full abstract»

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  • Digital Separation and Reconstruction of NTSC Signals

    Publication Year: 1980 , Page(s): 1085 - 1088
    Cited by:  Papers (2)  |  Patents (4)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (408 KB)  

    A new digital method for separation and reconstruction of NTSC color TV signals is described. Digital conversion between an NTSC signal and its baseband component signals is performed at a sampling rate of (12/5)f_{sc} \simeq 8.59 MHz (fsc: the color subcarrier frequency), which is lower than the conventionally used ... View full abstract»

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  • Comparison of Three-Phase Modulation with Two-Phase and Four-Phase Modulation

    Publication Year: 1980 , Page(s): 1098 - 1099
    Cited by:  Papers (8)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (216 KB)  

    For a constant added noise density at high signal-to-noise ratios and for the same error rate, three-phase PSK requires about 0.75 dB less energy per bit than two-phase or four-phase PSK. However, at very low signal-to-noise ratios, three-phase PSK requires about 0.74 dB more energy per bit of channel capacity than two-phase or four-phase PSK. View full abstract»

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  • Loop Evolution--Its Dynamics and Driving Forces

    Publication Year: 1980 , Page(s): 976 - 982
    Request Permissions | Click to expandAbstract | PDF file iconPDF (832 KB)  

    The basic concept of the present loop was initiated with the invention of the telephone. The loop plant has persistently been responsible for a major share of the total capital expenditures in the telephone network. It has also been the most reluctant part of the network to benefit from new technologies. Its evolution has been mostly confined to areas of distribution topologies, administration, an... View full abstract»

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  • The Loop Range Extension (LRE) Feature in Electronic Switching Systems (ESS)

    Publication Year: 1980 , Page(s): 949 - 955
    Request Permissions | Click to expandAbstract | PDF file iconPDF (752 KB)  

    The loop range extension (LRE) feature refers to electronic switching system (ESS) modifications required to implement concentrated range extension with gain, which involves the integration of switching and transmission technologies in the Central Office. This paper describes the interfaces between the LRE feature and Nos. 1/1A and 2/2B ESS's; it provides a brief description of the ESS networks an... View full abstract»

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  • Error Rate Monitoring in a Partial Response System

    Publication Year: 1980 , Page(s): 1052 - 1061
    Cited by:  Papers (3)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (880 KB)  

    Pseudoerror monitoring techniques, besides providing a precursive, measure of system degradation, can also be used in extrapolation schemes to estimate the actual bit error rate of a digital link. This study examines pseudoerror techniques as applied to a precoded, modified duobinary system. Two known methods of pseudoerror generation, namely, threshold modification and sampling offset, are compar... View full abstract»

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  • Threshold Effect on Error Probability in QAM Systems

    Publication Year: 1980 , Page(s): 1047 - 1052
    Cited by:  Papers (6)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (528 KB)  

    This paper considers the effect of the carrier phase error on the probability of error in a binary quadrature amplitude modulation (QAM) data transmission system in the presence of intersymbol interference and additive Gaussian noise. The analysis shows that there exists a threshold value of the carrier phase error such that the error probability remains almost unchanged as long as the carrier pha... View full abstract»

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  • The Analysis and Design of Data Quantization Schemes for Stochastic-Signal Detection Systems

    Publication Year: 1980 , Page(s): 983 - 991
    Cited by:  Papers (14)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (816 KB)  

    The optimal design and performance analysis of nonuniform quantizers are considered in the context of data quantization in detection systems for stochastic signals. The case of detection with small signal-to-noise ratio is treated using two different statistical models for the presence of the signal in this situation. A general data-quantized detection system is proposed, and analytical expression... View full abstract»

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  • Electronic Systems and Equipment for Evolving Loop Plant

    Publication Year: 1980 , Page(s): 967 - 975
    Cited by:  Papers (2)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (944 KB)  

    This paper discusses a French plan for enhanced subscriber service, and some of the systems and equipment that will meet these goals on existing loop plant. Since 1972, the French PTT has been installing digital central offices at the national, regional, and local levels. Coverage is expected to reach 10000000 lines by 1985, so that when integrated services can be offered, the nation will be ready... View full abstract»

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  • Bit Error Rate Comparison of Repeater and Regenerative Communication Satellites

    Publication Year: 1980 , Page(s): 1088 - 1097
    Cited by:  Papers (7)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (704 KB)  

    We evaluate and compare bit error rates for conventional (linear and nonlinear) repeater satellites and regenerative satellites. This work is based on a new formulation for error rates using the generalized moment technique for numerical evaluation of error rates. Both coherent MPSK and noncoherent MFSK modulations are considered with regenerative satellites. The results show that regenerative sat... View full abstract»

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  • DPCM Coders with Adaptive Prediction for NTSC Composite TV Signals

    Publication Year: 1980 , Page(s): 1079 - 1084
    Cited by:  Papers (5)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (592 KB)  

    New adaptive differential pulse code modulation (ADPCM) coders with adaptive prediction are proposed and compared with existing nonadaptive DPCM coders, for processing composite National Television System Commission (NTSC) television signals. Comparisons are based on quantative criteria as well as subjective evaluation of the processed still frames. The performance of the proposed predictors is sh... View full abstract»

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  • Analysis of Shared Finite Storage in a Computer Network Node Environment Under General Traffic Conditions

    Publication Year: 1980 , Page(s): 992 - 1003
    Cited by:  Papers (94)  |  Patents (28)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (912 KB)  

    Nodal storage limitations in a store and forward computer network lead to blocking; this results in degradation of network performance due to the loss or retransmission of blocked messages. In this paper, we consider several schemes for sharing a pool of buffers among a set of communication channels emanating from a given node in a network environment so as to make effective use of storage in a va... View full abstract»

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  • The CREG System Plan

    Publication Year: 1980 , Page(s): 931 - 942
    Request Permissions | Click to expandAbstract | PDF file iconPDF (952 KB)  

    The CREG concept extends the loop signaling and transmission range of No. 1/1A and No. 2/2B ESS to 2800 Ω. This is accomplished by embedding range extension and gain circuits in the B -links of the ESS networks behind the first stage of switching concentration. The 2800 Ω design limit for loops permits greatly increased use of lower cost, fine gauge ... View full abstract»

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  • Embedded DPCM for Variable Bit Rate Transmission

    Publication Year: 1980 , Page(s): 1040 - 1046
    Cited by:  Papers (76)  |  Patents (26)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (568 KB)  

    Within the bit stream of an embedded digital code is a stream that can be decoded to produce a reasonable replica of the analog source signal. Unlike pulse code modulation (PCM), differential PCM (DPCM), is not an embedded code. If C bits/sample are delected from the bit stream of a DPCM encoder with E bits/sample, the decod... View full abstract»

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  • Dynamic Routing and Flow Control

    Publication Year: 1980 , Page(s): 1030 - 1039
    Cited by:  Papers (16)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (912 KB)  

    This is an expanded version of an earlier report, adding, new results. The first part introduces a simple analytic model showing that dynamic routing may increase network throughput or lower delay when trunks are moderately loaded, but will reduce throughput or increase delay at heavy trunk loads. The second part of the paper presents simulation results characterizing: 1) the operation of a networ... View full abstract»

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  • The Concentrated Range Extender with Gain

    Publication Year: 1980 , Page(s): 943 - 948
    Cited by:  Patents (1)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (936 KB)  

    The concentrated range extender with gain (CREG) provides the subscriber telephone with voice frequency gain, signaling and supervision range extension, and increased loop current so that customer loops beyond the standard central office range can be served. CREG circuits, called 7A REG's, are shared among many customer lines by being connected inside the concentrating portion of an ESS switching ... 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
Robert Schober
University of British Columbia