IEEE Transactions on Communications

Issue 1 • January 1987

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Displaying Results 1 - 21 of 21
  • [Front cover and table of contents]

    Publication Year: 1987, Page(s): 0
    Request permission for commercial reuse | PDF file iconPDF (202 KB)
    Freely Available from IEEE
  • On the Computational Cutoff Rate, R0for the Peak-Power-Limited Gaussian Channel

    Publication Year: 1987, Page(s):13 - 20
    Cited by:  Papers (8)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (750 KB)

    The "computational cutoff rate," R0, represents a practical measure of the maximum reliable data rate that can be achieved by coding over a given communication channel using a given modulation format, in contrast with the "channel capacity,"C, which represents an idealized theoretical limit on the achievable data rate. Moreover, designing signal sets with good error probabili... View full abstract»

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  • 1983 Exchange Access Study: Analog Voice-Frequency Transmission Performance Characterization of the Exchange Access Plant

    Publication Year: 1987, Page(s):104 - 112
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (958 KB)

    This memorandum describes the Exchange Access Study (EAS), conducted in 1983, to characterize the analog voice and voiceband data transmission performance of toll-connecting trunks of the exchange access plant. The four major toll-connecting facility types, voicefrequency cable,T-carrier,N-carrier, and radio, were individually characterized for a variety of steady-state and t... View full abstract»

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  • Bounds on the Asymptotic Coding Gain of Long Binary Block Codes

    Publication Year: 1987, Page(s):113 - 114
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (219 KB)

    For some time it has been known that, for fixed code lengthn, binary BCH codes appear to be most efficient when the number of information bitskis between1/4 nand3/4 n[1, p. 443], [2, p. 219]. In this correspondence the efficiency of block codes on an binary-quantized additive white Gaussian noise channel is analyzed as a function of the code rater =... View full abstract»

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  • The Generation of High-Speed Binary Sequences from Interleaved Low-Speed Sequences

    Publication Year: 1987, Page(s):115 - 117
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (268 KB)

    This paper deals with the theory of generating high-speed binary sequences by interleaving two lower speed sequences which are displaced by half a bit period with respect to each other. The interleaving can be carried out by using a high-speed switch which is clocked at twice the clock rate of the lower speed sequences or by modulo 2 addition of the displaced sequences. Starting from any binary se... View full abstract»

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  • On Differential Detection of M-ary DPSK with Intersymbol Interference and Noise Correlation

    Publication Year: 1987, Page(s):117 - 120
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (390 KB)

    In this paper we study differential detection ofM-ary differential phase-shift-keyed (DPSK) signals with intersymbol interference and noise correlation. With these impairments there can be a wide variation in the error rate of the individual symbols, with this variation increasing withM. However, by adding a phase shift offset and adjusting the decision boundaries in the dete... View full abstract»

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  • Cutoff Rate for PPM Noisy Photon Counting Channel with Soft Decision

    Publication Year: 1987, Page(s):122 - 125
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (355 KB)

    A new method for bounding the cutoff rateRis presented. As an application, the case of ideal laser input signal with thermal noise on the photon counting PPM channel with soft decision decoding is given. The main result is that the cutoff rate efficiency (defined aslim_{srightarrow + infty} R/s, wheresis the average signal photon number) is given by (1- gamma)... View full abstract»

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  • [Back cover]

    Publication Year: 1987, Page(s): 0
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    Freely Available from IEEE
  • Error Probability Evaluation for Systems Employing Differential Detection in a Rician Fast Fading Environment and Gaussian Noise

    Publication Year: 1987, Page(s):39 - 46
    Cited by:  Papers (91)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    A method is presented for determining the error probability of a receiver using differential detection in the presence of Gaussian noise and fast Rician fading. Equations for the covariances of the fading component are derived, which include the effect of IF filter distortion. It is shown that these equations may be readily evaluated numerically. A simple formula for the error probability is deriv... View full abstract»

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  • A Simple Method for Evaluating the Probability Density Function of the Sample Number for the Optimum Sequential Detector

    Publication Year: 1987, Page(s):99 - 103
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    Sequential detectors are often used in PN-spread-spectrum systems to synchronize the incoming signal. In this paper it is shown that the probability density function (pdf) of the sample number for the optimum sequential detector can be computed recursively, provided that the samples from the envelope correlator are appropriately modeled as statistically independent. Furthermore, the error probabil... View full abstract»

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  • Transform and Hybrid Transform/DPCM Coding of Images Using Pyramid Vector Quantization

    Publication Year: 1987, Page(s):79 - 86
    Cited by:  Papers (31)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1288 KB)

    The transform and hybrid transform/DPCM methods of image coding are generalized to allow pyramid vector quantization of the transform coefficients. An asymptotic mean-squared error performance expression is derived for the pyramid vector quantizer and used to determine the optimum rate assignment for encoding the various transform coefficients. Coding simulations for two images at average rates of... View full abstract»

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  • Sampling of Bandpass Pyramids

    Publication Year: 1987, Page(s):125 - 127
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (208 KB)

    In image analysis and image coding there have been an increased use of multiresolution images, called pyramids or quad trees. In a recent paper Burt and Adelson [2] achieved good results with a Laplacian (bandpass) pyramid to compress image data. One problem with the conventional approach is that too many dimensions (samples) are used to describe the original image. This paper describes a method t... View full abstract»

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  • Channel Simulation to Facilitate Mobile-Satellite Communications Research

    Publication Year: 1987, Page(s):47 - 56
    Cited by:  Papers (54)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1224 KB)

    In designing a mobile satellite network, engineers and technologists are faced with wide-ranging issues for which there is no prior database. System engineers must address such issues as adequate margin to combat multipath fading, the level of adjacent channel protection required to allow transmission in narrow-band channels, the cochannel protection required to allow for frequency reuse in a mult... View full abstract»

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  • Development of an Error-Correction Method for Data Packet Multiplexed with TV Signals

    Publication Year: 1987, Page(s):21 - 31
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1376 KB)

    By using the vertical blanking period of television signals, it is possible to transmit coded data such as teletext, telesoftware, music, etc. However, the quality of data transmission on television transmission channels is very poor and a powerful error-correction code is required to reliably transmit coded data. From the results of simulations using error pattern data collected in field tests an... View full abstract»

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  • A Nonslotted Random-Access Channel with Higher Utilization

    Publication Year: 1987, Page(s):120 - 122
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    The paper considers a nonslotted random-access radio channel with users divided into a few classes. Assuming that capture exists between these classes of users and that users allotted to different classes use packets of different lengths, packet and data throughput are obtained. A set of packet lengths is found for which these throughputs exceed throughputs in the case when all users use equal-len... View full abstract»

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  • On Discrete Buffers in a Two-State Environment

    Publication Year: 1987, Page(s):32 - 38
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (736 KB)

    A discrete buffered system with infinite buffer size, one single output channel, and periodic opportunities for service (synchronous transmission) is considered in a two-state environment. The output channel is subjected to a random interruption process, which is characterized by a Bernoulli sequence of independent random variables, with probabilities dependent on the environment state. The enviro... View full abstract»

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  • Nyquist 3 Pulse Shaping in Continuous Phase Modulation

    Publication Year: 1987, Page(s):57 - 67
    Cited by:  Papers (18)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1040 KB)

    Continuous phase modulation (CPM) schemes, using Nyquist 3 pulse shaping and correlative codes, are popular candidates for mobile radio applications. This paper presents a detailed study of the effects of Nyquist 3 pulse shaping on the spectral characteristics of CPM schemes with a modulation index of 1/2. The influence of pulse parameters such as its shape, bandwidth, coding polynomial, and trunc... View full abstract»

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  • Error Probabilities for Spread-Spectrum Packet Radio with Convolutional Codes and Viterbi Decoding

    Publication Year: 1987, Page(s):1 - 12
    Cited by:  Papers (127)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1296 KB)

    The use of convolutional coding in packet radio systems introduces problems in evaluating performance, since the errors out of the decoder are not independent. A new bound on the packet error probability out of a Viterbi decoder may be used to evaluate these systems. We present results on the packet error probability for frequencyhop and direct-sequence spread-spectrum systems. In addition, we sho... View full abstract»

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  • On the Optimality of Cyclic Transmission in Teletext Systems

    Publication Year: 1987, Page(s):68 - 73
    Cited by:  Papers (59)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    Teletext is a one-way information delivery system where pages of information are broadcast to all users in a continuous manner. System response time is an important consideration in the design of teletext systems. One factor contributing to response time is the order in which pages are transmitted. In this paper, we formulate the problem of determining the sequence of page transmissions as a Marko... View full abstract»

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  • Rice's Representation for Cyclostationary Processes

    Publication Year: 1987, Page(s):74 - 78
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    The well-known formulas relating power spectral densities of a bandpass process and its low-pass representors in Rice's representation are generalized to accommodate cyclostationary processes, which can be more appropriate than stationary processes as models for modulated signals. It is explained that improper phase-randomization methods for stationarizing cyclostationary processes can yield misle... View full abstract»

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  • Error Probabilities for Binary Direct-Sequence Spread-Spectrum Communications with Random Signature Sequences

    Publication Year: 1987, Page(s):87 - 98
    Cited by:  Papers (284)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1224 KB)

    Binary direct-sequence spread-spectrum multiple-access communications, an additive white Gaussian noise channel, and a coherent correlation receiver are considered. An expression for the output of the receiver is obtained for the case of random signature sequences, and the corresponding characteristic function is determined. The expression is used to study the density function of the multiple-acce... 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