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Communications, IEEE Transactions on

Issue 3 • Date March 1985

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Displaying Results 1 - 23 of 23
  • [Front cover and table of contents]

    Publication Year: 1985 , Page(s): 0
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    Freely Available from IEEE
  • [Back cover]

    Publication Year: 1985 , Page(s): 0
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    Freely Available from IEEE
  • Statistics of Impulsive Noise Crosstalk in Digital Line Systems on Multipair Cable

    Publication Year: 1985 , Page(s): 259 - 270
    Cited by:  Papers (5)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (1096 KB)  

    Crosstalk theory is applied to the prediction of error rates in digital line systems due to analog telephony signaling events on adjacent pairs in the same cable. Measurements of the margin against impulsive noise at a given probability of error have been performed, and these show reasonable agreement with predictions based on crosstalk theory. For a simple switching event, the regenerator NEXT im... View full abstract»

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  • Carrier-to-Intermodulation Performance of Multiple FM/FDM Carriers Through a GaA1As Hetrojunction Laser Diode

    Publication Year: 1985 , Page(s): 246 - 248
    Cited by:  Papers (25)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (248 KB)  

    The simple nonlinear rate equations are used to predict the carrier-to-intermodulation performance of laser diodes excited by an arbitrary number of equal-amplitude, equally spaced FM carriers. The special case of relatively small input carrier amplitudes and slowly varying angle modulations is considered and closed-form approximations are obtained. View full abstract»

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  • An ARQ Scheme with Memory and Soft Error Detectors

    Publication Year: 1985 , Page(s): 285 - 288
    Cited by:  Papers (57)  |  Patents (1)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (384 KB)  

    This paper describes a technique for increasing the efficiency of an ARQ communication system utilizing error detection codes. In this technique the blocks containing errors are not discarded at the receiver, as in the conventional ARQ systems. Such blocks are retained in order to make use of the information contained in them. A reliability value is associated to each demodulated symbol; this reli... View full abstract»

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  • A Nonlinear Device to Suppress Strong Interfering Signals with Arbitrary Angle Modulation in Spread-Spectrum Receivers

    Publication Year: 1985 , Page(s): 300 - 302
    Cited by:  Papers (13)  |  Patents (1)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (288 KB)  

    A device which can be used to suppress strong constantenvelope interfering signals at the input of spread-spectrum receivers is described and analyzed. Unlike similar circuits known from literature, this device is not restricted to the suppression of narrow-band jamming signals; it can also cope with broad-band interfering signals bearing any kind of angle modulation. The theoretical results are c... View full abstract»

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  • Robust Quantization of ε-Contaminated Data

    Publication Year: 1985 , Page(s): 218 - 222
    Cited by:  Papers (4)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (496 KB)  

    The problem of robust quantization of data with uncertain statistical properties is considered. Uncertainty in the statistics of the data is modeled by assuming that the data have a probability density function of the ε-contaminated form, and a minimax approach to robust design is adopted. An approximation is developed for the asymptotic worst-case distortion (over the ε-contaminated cla... View full abstract»

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  • Specification and Verification of Switching Software

    Publication Year: 1985 , Page(s): 193 - 198
    Cited by:  Papers (1)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (728 KB)  

    This paper describes specification and verification technology for software development. This technology consists of 1) a Specification description language called LAN-S, 2) a compiler to generate data for specification verification, and 3) a specification analysis algorithm (analyzer). A switching system and terminals are regarded as state transition machines in this technology. From specificatio... View full abstract»

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  • Exact Results for Nonsymmetric Token Ring Systems

    Publication Year: 1985 , Page(s): 223 - 231
    Cited by:  Papers (63)  |  Patents (1)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (928 KB)  

    This paper derives exact results for a token ring system with exhaustive or gated service. There are N nodes on the ring and control is passed sequentially from one to the next. Messages with random lengths arrive at each node and are placed on the ring when the control arrives at that node. Exhaustive service means that the queue at a node is empty before the ... View full abstract»

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  • On the Performance of Three Suboptimum Detection Schemes for Binary Signaling

    Publication Year: 1985 , Page(s): 241 - 245
    Cited by:  Papers (21)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (464 KB)  

    The penalties incurred in using the sample-and-sum, weighted partial decision, and binary Partial decision detectors are analyzed. Even though these schemes are inferior to the digital matched filter detector, they could be used in systems with more modest computational capabilities. Analytic expressions are obtained for the losses when the number of samples M ... View full abstract»

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  • Capacity Estimation of Cyclic Queues

    Publication Year: 1985 , Page(s): 279 - 282
    Cited by:  Papers (5)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (464 KB)  

    In many data communication and telephone switching systems, one processor must perform more than one type of task. In some systems it is advantageous to place the different tasks in different queues and have the processor serve the queues in a cyclic manner. Moreover, the system design often imposes a (finite or infinite) limit on the number of entries that may be served per cycle from any given q... View full abstract»

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  • SQAM: A New Superposed QAM Modem Technique

    Publication Year: 1985 , Page(s): 296 - 300
    Cited by:  Papers (20)  |  Patents (17)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (432 KB)  

    A spectral and power efficient modulation techniquesuperposed quadrature amplitude modulation (SQAM-is introduced. In SQAM, the premodulation baseband signal is a double-interval ( 2T_{s} ) raised-cosine pulse superposed with weighted single-interval (Ts) raisedcosine pulses. Our results indicate that SQAM has spectral advantages over OQPSK, QBL, ... View full abstract»

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  • Direct-Detection Optical Communication with Color Coded Pulse Position Modulation Signaling

    Publication Year: 1985 , Page(s): 273 - 276
    Cited by:  Papers (3)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (464 KB)  

    The performance characteristics of a direct-detection optical communication system, in which a laser transmitter sends short optical pulses of selected nonoverlapping center frequencies, are analyzed. It is shown that this signaling scheme can be used in conjunction with ReedSolomon coding to obtain high data rate, reliable communication under conditions of optimal energy efficiency. View full abstract»

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  • Application of the Volterra Functional Expansion in the Detection of Nonlinear Functions of Gaussian Processes

    Publication Year: 1985 , Page(s): 276 - 279
    Cited by:  Papers (4)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (344 KB)  

    Detection of a memoryless nonlinear functional of a Gaussian process in additive Gaussian white noise is considered. The Volterra functional expansion for the likelihood ratio, and two examples of calculating the kernels are presented. It is shown that kernels up to third order can be obtained for a hard-limited Gaussian process and for the absolute value of a Gaussian process. For the case of har... View full abstract»

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  • An Analysis of a Point-to-Multipoint Channel Using a Go-Back-N Error Control Protocol

    Publication Year: 1985 , Page(s): 282 - 285
    Cited by:  Papers (21)  |  Patents (3)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (456 KB)  

    This paper contains a performance analysis of an error control protocol operating in a point-to-multipoint environment. This protocol, called broadcast go-back- N [BGB( N )], is a generalization of the standard go-back- N point-to-point protocol. Expressions for the message throughput and... View full abstract»

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  • Comparison Between the Performance of QPSK, SQPSK, QPR, and SQPR Systems Over Microwave LOS Channels

    Publication Year: 1985 , Page(s): 291 - 296
    Cited by:  Papers (13)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (568 KB)  

    This paper studies the effectiveness of adaptive equalizers used with QPSK, SQPSK, QPR, and SQPR modems over frequency selective microwave LOS channels. A power series model is employed to represent the channel model, giving special attention to the channels with a null in the passband. The effect of staggering the symbols on the performance of modems with and without an adaptive equalizer is prov... View full abstract»

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  • The Effect of Channel Coding on the Efficiency of Cellular Mobile Radio Systems

    Publication Year: 1985 , Page(s): 288 - 291
    Cited by:  Papers (5)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (448 KB)  

    Error correcting codes have two opposite effects on the efficiency of cellular mobile-radio systems. Although they increase the bandwidth per channel, the codes also make signals more robust and thereby reduce the required distance between users of the same frequency band. This paper reports a mathematical study of the interactions of these two effects in determining the efficiencies of a large nu... View full abstract»

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  • Local Network Area Size Optimization

    Publication Year: 1985 , Page(s): 199 - 202
    Cited by:  Papers (2)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (400 KB)  

    A foundation for economically optimizing the size of a local network area, defined as an area comprising a transit switch and a number of local switches homing on it, is obtained by introducing the concept of an "intra-area traffic ratio." The local network area radius is found to be optimal when the gradient of the intra-area traffic ratio relative to the area radius equals the ratio of the junct... View full abstract»

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  • Multidestination Protocols for Satellite Broadcast Channels

    Publication Year: 1985 , Page(s): 232 - 240
    Cited by:  Papers (22)  |  Patents (12)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (952 KB)  

    Two retransmission procedures, the go-back- N (GBN) scheme and the selective repeat (SR) scheme, have been analyzed for data transfer from one transmitter to many receivers. We consider transfer of error-controlled bulk data over a satellite broadcast channel. Two retransmission strategies, the dynamic retransmission group reduction (DRGR) technique and the fix... View full abstract»

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  • Performance of Block Cosine Image Coding with Adaptive Quantization

    Publication Year: 1985 , Page(s): 210 - 217
    Cited by:  Papers (4)  |  Patents (8)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (1536 KB)  

    Quantizers for block transform image coding systems are typically designed under the assumption of Gaussian statistics for the transform coefficients. While convincing arguments can be provided in support of this approach, empirical evidence is presented demonstrating that, except possibly for the dc term, wide departures from Gaussian behavior can be expected for real-world imagery at typical blo... View full abstract»

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  • A Use of Double Integration in Sigma Delta Modulation

    Publication Year: 1985 , Page(s): 249 - 258
    Cited by:  Papers (317)  |  Patents (106)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (832 KB)  

    Sigma delta modulation is viewed as a technique that employs integration and feedback to move quantization noise out of baseband. This technique may be iterated by placing feedback loop around feedback loop, but when three or more loops are used the circuit can latch into undesirable overloading modes. In the desired mode, a simple linear theory gives a good description of the modulation even when... View full abstract»

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  • Error Performance of Binary NCFSK in the Presence of Multiple Tone Interference and System Noise

    Publication Year: 1985 , Page(s): 203 - 209
    Cited by:  Papers (25)  |  Patents (3)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (576 KB)  

    This paper presents a general solution to the problem of calculating the error performance of binary NCFSK systems in the presence of multiple tone interference and system noise. The development uses the concepts of circularly symmetric signals and expresses the results in terms of a Bessel integral. This integral is then evaluated using a rapidly converging Fourier-Bessel series. The error in thi... View full abstract»

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  • Bounds and Approximations for Rapid Evaluation of Coherent MPSK Error Probabilities

    Publication Year: 1985 , Page(s): 271 - 273
    Cited by:  Papers (7)
    Request Permissions | Click to expandAbstract | PDF file iconPDF (312 KB)  

    The error probability for MPSK detection is expressed here as a sum of a familiar upper-bound approximation and a correction term which is well suited for numerical integration. An asymptotic expansion of the correction term is derived, from which simple and extremely tight upper and lower bounds are obtained. Relative errors in using these bounds and approximations of them are graphed for cases o... 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