By Topic

Communications, IEEE Transactions on

Issue 11 • Date November 1985

Filter Results

Displaying Results 1 - 13 of 13
  • [Front cover and table of contents]

    Publication Year: 1985 , Page(s): 0
    Request Permissions | PDF file iconPDF (175 KB)  
    Freely Available from IEEE
  • [Back cover]

    Publication Year: 1985 , Page(s): 0
    Request Permissions | PDF file iconPDF (248 KB)  
    Freely Available from IEEE
  • A Condition for Optimality of Two-Dimensional Signal Constellations

    Publication Year: 1985 , Page(s): 1220 - 1222
    Cited by:  Papers (1)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (328 KB)  

    We present a necessary condition that optimum two-dimensional signal constellations, used over an additive white Gaussian noise (AWGN) channel, must satisfy. Our condition is contrasted with another condition previously mentioned in the literature. A constellation of five signal points is given as an example. It is shown that the five points comprise the vertices of three equilateral triangles. View full abstract»

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

    Publication Year: 1985 , Page(s): 1160 - 1170
    Request Permissions | Click to expandAbstract | PDF file iconPDF (1240 KB)  

    This paper formalizes and extends a tree-based local area network, called the lookahead network, proposed by Lipovski, Goyal, and Malek. The leaf nodes in the network are workstations, and the nonleaf nodes consist of pure combinational logic used in carry lookahead circuits of binary adders. Any of the ring or bus access protocols (token passing, contention, etc.) can be used on this network. The... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Predictive Vector Quantization of Images

    Publication Year: 1985 , Page(s): 1208 - 1219
    Cited by:  Papers (48)  |  Patents (1)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (2248 KB)  

    The purpose of this paper is to present new image coding schemes based on a predictive vector quantization (PVQ) approach. The predictive part of the encoder is used to partially remove redundancy, and the VQ part further removes the residual redundancy and selects good quantization levels for the global waveform. Two implementations of this coding approach have been devised, namely, sliding block... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Announced Retransmission Random Access Protocols

    Publication Year: 1985 , Page(s): 1183 - 1190
    Cited by:  Papers (24)  |  Patents (1)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (848 KB)  

    A new contention-based broadcast multiaccess protocol called announced retransmission random access (ARRA) is introduced and analyzed in this paper. The proposed class of protocols increases the capacity of a slotted random access channel by adding a small amount of potentially useful control information to every message transmission. In particular, the ARRA technique requires users to announce th... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Uncovered Background Prediction in Interframe Coding

    Publication Year: 1985 , Page(s): 1227 - 1231
    Cited by:  Papers (15)  |  Patents (6)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (968 KB)  

    Various interframe coding methods have been devised to reduce the cost of television signal transmission. Some degradation still remains, however, because prediction efficiency is lowered in uncovered background areas which appear behind moving objects. This paper proposes an uncovered background predictive coding algorithm, which increases prediction efficiency. Prediction efficiency is evaluated... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Capacity Allocation in Multiple Access Networks

    Publication Year: 1985 , Page(s): 1224 - 1226
    Cited by:  Papers (4)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (360 KB)  

    The theoretical issues of scheduling for capacity allocation in multiple access networks using in-band and out-of-band signaling are addressed. The analysis is carried out under the hypothesis that the "scheduling epochs" consist of bandwidth-dependent and bandwidthindependent components. The ultimate limitation on channel capacity rests with the bandwidth-independent component. It is shown that o... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Output Processes in Contention Packet Broadcasting Systems

    Publication Year: 1985 , Page(s): 1191 - 1199
    Cited by:  Papers (27)  |  Patents (3)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (664 KB)  

    The processes consisting of the packet interdeparture times in contention-type packet broadcasting systems are studied under the heavy-traffic assumption. The channel access protocols considered include slotted and unslotted ALOHA and carrier-sense-multiple-access (CSMA) with and without collision detection. Through analysis of the Channel activity cycle, the distribution, mean, and coefficient of... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Throughput--Delay Characteristics of Some Slotted-ALOHA Multihop Packet Radio Networks

    Publication Year: 1985 , Page(s): 1200 - 1207
    Cited by:  Papers (23)  |  Patents (1)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (744 KB)  

    A Markovian model is formulated to find the throughputdelay performance for slotted-ALOHA multihop packet radio networks with a fixed configuration of packet radio units (terminals and repeaters) and fixed source-to-link paths for packets. Improvements in performance which are obtained by the adjustment of transmission parameters (suppression/acceleration) according to the states of nearby units a... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Capacity and Cutoff Rate of Noncoherent FSK with Nonselective Rician Fading

    Publication Year: 1985 , Page(s): 1153 - 1159
    Cited by:  Papers (47)  |  Patents (3)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (592 KB)  

    The capacity and cutoff rate of frequency-shift keying (FSK) modulation and noncoherent reception when the signal is subject to Rician fading are calculated. Both hard and soft decisions with maximum likelihood combining are considered, as well as soft decisions with square-law combining. Optimal code rates are found that minimize the required signal-to-noise ratio for reliable communication. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The Integrity of Data Delivery in Computer Networks

    Publication Year: 1985 , Page(s): 1222 - 1224
    Cited by:  Papers (1)  |  Patents (2)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (400 KB)  

    This correspondence deals with the problem of undetected packet misdelivery in computer networks as a result of node failures. Techniques for reducing its chance of occurrence are discussed. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • On the Thrashing Cusp in Slotted Aloha Systems

    Publication Year: 1985 , Page(s): 1171 - 1182
    Cited by:  Papers (23)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (1104 KB)  

    We develop a new tool for performance evaluation of a multiaccess communication system. We give an explicit detailed analytic description of a cusp catastrophe in a computer communication system. An approximate model is formulated for a slotted Aloha system assuming a single buffer, based on the Markovian model studied by Lam [2] and Carleial [3]. Next, we outline the research on quantitative proc... 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
Robert Schober
University of British Columbia