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IEEE Transactions on Communications

Issue 2 • Date February 1980

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Displaying Results 1 - 25 of 28
  • [Front cover and table of contents]

    Publication Year: 1980, Page(s): 0
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    Freely Available from IEEE
  • Analysis of a Two-Hop Centralized Packet Radio Network - Part I: Slotted ALOHA

    Publication Year: 1980, Page(s):196 - 207
    Cited by:  Papers (59)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (995 KB)

    The design of packet radio systems involves a large number of design variables that interact in a very complex fashion. As this design problem in its general form is quite complex, a viable approach is to analyze some simple but typical configurations in an attempt to understand the behavior of these systems. In this paper, a two-hop centralized configuration is considered in which traffic origina... View full abstract»

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  • Analysis of a Two-Hop Centralized Packet Radio Network - Part II: Carrier Sense Multiple Access

    Publication Year: 1980, Page(s):208 - 216
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (624 KB)

    We continue in this paper our study of two-hop centralized packet radio networks in view of understanding the behavior of these systems. Traffic originates at terminals, is destined to a central station, and requires for its transport the relaying of packets by store-and-forward repeaters. We consider here that all devices employ the nonpersistent carrier sense multiple-access mode. System capacit... View full abstract»

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  • Comments on "The vector space formulation of the rain crosspolarization problem and its compensation"

    Publication Year: 1980, Page(s):311 - 312
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (196 KB)

    In the above paper (ibid., vol. COM-27, pp. 502-509, Feb. 1979) L.S. Lee proposes a method to compensate for the rain-induced cross polarization in a dual-polarization zation link. This method is based on a model of Chu, in which the effect of rain on two orthogonal linear polarizations, along unit vectors is represented by a given matrix. The idea is that the medium is characterized by two orthog... View full abstract»

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  • Author's Reply

    Publication Year: 1980, Page(s): 312
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (84 KB)

    It is noted that the commentor has made a new interesting interpretation of the mathematical formulation in the paper, which is different from the original idea presented in it. In the original work the two "signals" are first passed through the network, which forms their sum and difference and introduces phase shift, before entering the antenna feed and being radiated in form of "polarized waves.... View full abstract»

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  • [Back cover]

    Publication Year: 1980, Page(s): 0
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    Freely Available from IEEE
  • Static Flow Control in Store-And-Forward Computer Networks

    Publication Year: 1980, Page(s):271 - 279
    Cited by:  Papers (42)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (944 KB)

    In this paper we develop an analytic model for end-to-end communication protocols and study the window mechanism for flow control in store-and-forward (in particular message-switching) computerbased communication networks. We develop a static flow control model in which the parameters of the system are not dynamically adjusted to the stochastic fluctuation of the system load. Numerical results are... View full abstract»

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  • Commutativity and Application of Digital Interpolation Filters and Modulators

    Publication Year: 1980, Page(s):244 - 249
    Cited by:  Papers (1)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    Interpolation filters are being widely used in a variety of communication applications. An equivalent realization of an interpolation FIR filter is shown to be a cascade combination of a hold and a periodically varying filter. It is also shown that the periodicity of the filter results in the Commutativity of the filter and a sinusoidal modulator. An application of such a scheme to TDM-FDM transmu... View full abstract»

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  • Batch Throughput Efficiency of ADCCP/HDLC/SDLC Selective Reject Protocols

    Publication Year: 1980, Page(s):187 - 195
    Cited by:  Papers (26)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (776 KB)

    The batch throughput efficiency is studied for three variants on selective reject protocols that operate in a full duplex asynchronous response mode and that adhere to the common architectural features of ADCCP, HDLC, and SDLC. In these architectures, the receiver of information frames may use the REJ supervisory frame to request the sender of information frames to back up to an earlier point in t... View full abstract»

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  • Discrete-Time Queueing Systems and Their Networks

    Publication Year: 1980, Page(s):260 - 263
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    Queueing systems in descrete time that can model certain computer communication systems are considered. First, a single-resource model consisting of a geometric server with feedback facility, to which packets arrive in independent bulks, is analyzed. Then, it is shown that a network of such geometric resources with packets arriving in independent Bernoulli streams (which, in a sense, is a discrete... View full abstract»

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  • Analysis and Optimal Design of a Packet-Voice Receiver

    Publication Year: 1980, Page(s):217 - 227
    Cited by:  Papers (48)  |  Patents (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (864 KB)

    The analysis problems arising from a digital packet switched speech network are outlined in a wide statistical environment. The statistical models assumed are discussed with respect to practical applications. Particular attention is devoted to a formal description of the influence of the packet voice receiver on the system behavior in terms of the delay pdf. The optimization of the system performa... View full abstract»

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  • Recursive Algorithms for Computing End-to-End Blocking in a Network with Arbitrary Routing Plan

    Publication Year: 1980, Page(s):153 - 164
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1008 KB)

    This paper presents three recursive algorithms for computing end-to-end blocking probabilities in a network with alternate routing, based on link blocking probabilities. The only assumption made is the statistical independence of link blocking probabilities. The first algorithm applies to arbitrary routing plans. The second algorithm applies to single-loss-route routing plans which include predict... View full abstract»

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  • Dynamic Flow Control in Store-and-Forward Computer Networks

    Publication Year: 1980, Page(s):263 - 271
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (976 KB)

    In a recent paper we presented an analysis of flow control in store-and-forward computer communication networks using a token mechanism. The analysis assumed equilibrium conditions for a selected set of system parameters which were not dynamically adjusted to stochastic fluctuations in the system load; this mechanism was referred to as "static flow control." In this paper we study a "dynamic flow ... View full abstract»

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  • Error Event Statistics for Convolutional Codes

    Publication Year: 1980, Page(s):302 - 304
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    Viterbi (1971) introduced a structure generating function T(D,N,L) for convolutional codes and used it to bound the probability of a decoding error P(\bar{e}) . Viterbi's result is used to approximate the probability function P(l, \bar{e}) on error events of length View full abstract»

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  • New Code Acquisition Techniques in Spread-Spectrum Communication

    Publication Year: 1980, Page(s):249 - 257
    Cited by:  Papers (13)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (784 KB)

    New techniques for acquiring the codes used in frequency hopping (FH), hybrid frequency hopping/time hopping (FH/TH), and frequency hopping/direct sequence (FH/DS) spread-spectrum systems are presented. Autoregressive spectral estimation is employed to recover the FH code, quadrature processing is used for the DS code, while the TH gating code is recovered by a simple threshold test used in conjun... View full abstract»

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  • Laser Mode Partition Noise Evaluation for Optical Fiber Transmission

    Publication Year: 1980, Page(s):238 - 243
    Cited by:  Papers (73)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    An evaluation of the influence of mode partition noise on error rate performance in a high bit rate optical fiber transmission system is presented. First, it is experimentally clarified that the intensity in each longitudinal mode of a laser diode fluctuates, although the intensity for the total mode is constant. It is also established that this fluctuation causes degradation of the error rate per... View full abstract»

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  • On Soft-Decision Demodulation for PCM- and DPCM- Encoded Speech

    Publication Year: 1980, Page(s):308 - 311
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    In a simulation of soft decision demodulation-interpolation for digital speech transmission, it has been noted that signal-to-noise ratio gains due to the technique are greater with nonadaptive and periodically adaptive quantizers than with instantaneously adaptive quantizers; further, the gains are greater with PCM than with differential PCM. Our results for nonadaptive PCM reinforce those in a r... View full abstract»

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  • Multilevel Signaling over Step-Index Fibers

    Publication Year: 1980, Page(s):294 - 297
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    This paper investigates the effects of a multilevel signal applied in an optical communication system with a step-index fiber. The model for description of the fiber impulse response used here is more accurate than previously used models, which influenced conclusions significantly. It is found that multilevel signals can improve performances of a digital optical system when intersymbol interferenc... View full abstract»

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  • Filters for the Detection of Binary Signaling: Optimization Using the Chernoff Bound

    Publication Year: 1980, Page(s):257 - 259
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    The probability of error in the detection of binary signaling by a linear receiver is upper bounded by the Chernoff bound, and a general relationship is obtained whose solution gives a receiver filter and threshold which minimize this bound. As an example, the detection of Poisson signaling in the presence of additive white-Gaussian noise is considered and the resulting filter lies between the opt... View full abstract»

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  • Alternate Symbol Inversion for Improved Symbol Synchronization in Convolutionally Coded Systems

    Publication Year: 1980, Page(s):228 - 237
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (824 KB)

    Inverting alternate symbols of the encoder output of a convolutionally coded system provides sufficient density of symbol transitions to guarantee adequate symbol synchronizer performance, a guarantee otherwise lacking. Although alternate symbol inversion may increase or decrease the average transition density, depending on the data source model, it produces a maximum number of contiguous symbols ... View full abstract»

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  • K-Band Mobile Earth Station for Domestic Satellite Communications System

    Publication Year: 1980, Page(s):291 - 294
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    Design considerations of a K -band (30/20 GHz) mobile earth station for a domestic satellite communications system are described. A Japanese Medium Capacity Communication Satellite which utilizes K and C satellite communication bands was considered for the system design. Transmitting po... View full abstract»

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  • Nonlinearity and Its Compensation of Semiconductor Laser Diodes for Analog Intensity Modulation Systems

    Publication Year: 1980, Page(s):297 - 300
    Cited by:  Papers (12)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    Experimental investigation was carried out on nonlinear video distortions of differential gain and differential phase in various optical transmitters using laser diode structures having a single transverse mode operation. It was observed that the measured nonlinearity of laser diodes was comparable to that of a typical LED. A simple linearizing technique for improving the nonlinearity, using an em... View full abstract»

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  • The M/G/1 Finite Capacity Queue with Delays

    Publication Year: 1980, Page(s):165 - 172
    Cited by:  Papers (27)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    A steady-state analysis of the M/G/1 finite capacity queue with delays is being made. In this model every busy period is followed by the execution of a noninterruptable task other than the servicing of ordinary customers; the duration of this task, called a delay, is a random variable with general distribution. Closed form expressions, easy to evaluate, are g... View full abstract»

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  • Packet Radio Performance Over Slow Rayleigh Fading Channels

    Publication Year: 1980, Page(s):279 - 286
    Cited by:  Papers (27)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (672 KB)

    Expressions for the throughput and average packet delay for a Pure-ALOHA single-hop packet radio system operating in slow Rayleigh fading are derived. For noncoherent frequency-shift-keying (NCFSK), an exact closed form expression is presented. For coherent phase-shift-keying (CPSK) an excellent approximation for large packet sizes is derived. This approximation technique is valid in general for o... View full abstract»

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  • Spectral Characteristics of Convolutionally Coded Digital Signals

    Publication Year: 1980, Page(s):173 - 186
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1272 KB)

    The power spectral density of the output symbol sequence of a convolutional encoder is computed for two different input symbol stream source models, namely, an NRZ signaling format and a first-order Markov source. In the former, the two signaling states of the binary waveform are not necessarily assumed to occur with equal probability. The effects of alternate symbol inversion on this spectrum are... 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