By Topic

IEEE Transactions on Communications

Issue 4 • Date April 1987

Filter Results

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 (203 KB)
    Freely Available from IEEE
  • [Back cover]

    Publication Year: 1987, Page(s): 0
    Request permission for commercial reuse | PDF file iconPDF (247 KB)
    Freely Available from IEEE
  • A Note on the Wide-Band Gaussian Broadcast Channel

    Publication Year: 1987, Page(s):452 - 453
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    Recently, Posner noted that on a wide-band Gaussian broadcast channel, ordinary time-shared coding performs almost as well as more sophisticated broadcast coding strategies. In this note, we shall give a quantitative version of Posner's result and argue that for certain realistic broadcast channels time sharing may suffice. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Optimal Dynamic Routing in Multidestination Networks

    Publication Year: 1987, Page(s):472 - 475
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    The dynamic routing problem for multiple destination networks is considered. The minimum time rather than total delay cost functional is employed. Each link capacity is optimally partitioned by examining the competition of bottlenecks associated with each destination. The multidestination problem is thus solved through an iterative link-by-link optimization. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Energy Optimization of Band-Limited Nyquist Signals in the Time Domain

    Publication Year: 1987, Page(s):427 - 434
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (688 KB)

    This paper presents a theoretical consideration of the optimal design of band-limited Nyquist-type signal shapes for data transmission, which maximizes its energy in a given time interval and which generates no intersymbol interference at the periodic sampling instants. A method based on a completely analytical approach is given for design of such signals. The optimal signal is a solution of an in... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Performance of a Multiprocessor-Based Parallel Stack Algorithm Speech Encoder

    Publication Year: 1987, Page(s):463 - 466
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    A parallel processor version of the stack algorithm is proposed that searches the code tree in parallel. The parallel stack algorithm is then implemented and tested using a loop architecture with four Intel 8086 microprocessors. The two versions of the stack algorithm, the uniprocessor and multiprocessor implementations, are then used to encode a voiced speech sound. The multiprocessor version sim... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Receiver Structures for Multi-h Signaling Formats

    Publication Year: 1987, Page(s):439 - 451
    Cited by:  Papers (33)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1096 KB)

    A method of utilizing the available communication bandwidth efficiently is provided by multi- h phase coding. A receiver structure for joint estimation of data, carrier phase, and symbol timing is derived based on ML estimation techniques and subsequently assessed analytically and by means of Monte Carlo simulation procedures. Results indicate that the receive... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A New Halftone Reproduction and Transmission Method Using Standard Black and White Facsimile Code

    Publication Year: 1987, Page(s):466 - 470
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    This paper proposes an adaptive dithering method, which can reproduce grey levels with good character quality. It also proposes dither threshold patterns with long run-length, which are able to obtain a compression ratio of about 3 or 4 when using modified Huffman coding schemes. The method presented here is applicable to facsimile equipment for transmitting pictures, including both continuoustone... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • On the Mean Number of Stuffing Bits in a Prefix-Synchronized Code

    Publication Year: 1987, Page(s):453 - 455
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    Artom [1] suggested a bit-stuffing technique to map data blocks into prefix-synchronized code words. In this correspondence we compute the mean number of stuffing bits required. We prove that the average number of stuffing bits per block is quite small. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Performability Evaluation of Fault-Tolerant Satellite Systems

    Publication Year: 1987, Page(s):403 - 409
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    A combined performance and reliability (performability) measure for gracefully degradable fault-tolerant satellite systems is introduced, and a closed-form analytic solution is provided in order to compute the performability for a class of unrepairable systems. An efficient algorithm for the solution of Markovian models which take into account the degradation of more than one type of system compon... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Failsafe End-to-End Protocols in Computer Networks with Changing Topology

    Publication Year: 1987, Page(s):410 - 413
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    End-to-end protocols in computer networks in which the topology changes with time are investigated. A protocol that delivers all packets ordered, without duplication, and which uses a window is presented. Using a precise model of the network correctness of the protocol is proven. The use of the window for flow control is also addressed. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Mean-Square Crosstalk in Tamed Frequency Modulation

    Publication Year: 1987, Page(s):455 - 458
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    An analytical expression for evaluating the mean-square crosstalk between adjacent channels in coherent tamed frequency modulation (TFM) systems is presented. Numerical results are obtained and compared to previous crosstalk results for minimum shift keying (MSK); the substantial superiority of TFM is confirmed. An equivalent white Gaussian noise model for crosstalk is included and used to estimat... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Bit Error Probability of Trellis-Coded Quadrature Amplitude Modulation Over Cross-Coupled Multidimensional Channels

    Publication Year: 1987, Page(s):369 - 381
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1256 KB)

    Convolutionally encoded M -ary quadrature amplitude modulation ( M -QAM) systems operated over multidimensional channels, for example dual-polarized radio systems, are considered in this paper. We have derived upper bounds on the average bit-error probability for 4QAM (QPSK) with conventional convolutional coding by means of... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Pulse Shape, Excess Bandwidth, and Timing Error Sensitivity in PRS Systems

    Publication Year: 1987, Page(s):475 - 480
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    In this correspondence, the effect of pulse shape on the performance of nonminimum bandwidth partial response signaling (PRS) systems is studied, using the measures of speed tolerance, eye width, and robustness to sampling phase jitter. In general, in modified duobinary (1- D^{2}) and dicode (1 - D) systems, linear rol... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • New Universal All-Digital CPM Modulator

    Publication Year: 1987, Page(s):458 - 462
    Cited by:  Papers (5)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    In this paper a new modulator for a broad class of continuous phase modulations (CPM) is proposed that is more flexible and less complex than conventional quadrature modulators, while achieving the same or better performance. Being all-digital it is more suitable for one-chip VLSI implementation. Some design parameters are also discussed and experimental results are presented. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Analysis of Moderate and Intense Rainfall Rates Continuously Recorded Over Half a Century and Influence on Microwave Communications Planning and Rain-Rate Data Acquisition

    Publication Year: 1987, Page(s):382 - 395
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1360 KB)

    This paper is concerned with the statistical investigation of a massive data bank of 49 years of rainfall rate R continuously recorded in Barcelona using a rain-rate gauge with ten seconds response time. With radio communications in mind, the paper addresses and reviews in detail: 1) reliable statistical model for R , 2)... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • On Packet Switches with Infinite Storage

    Publication Year: 1987, Page(s):435 - 438
    Cited by:  Papers (121)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    Most prior work on congestion in datagram systems focuses on buffer management. We find it illuminating to consider the case of a packet switch with infinite storage. Such a packet switch can never run out of buffers. It can, however, still become congested. The meaning of congestion in an infinite-storage system is explored. We demonstrate the unexpected result that a datagram network with infini... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • On the Probability Density of Intersymbol Interference

    Publication Year: 1987, Page(s):396 - 402
    Cited by:  Papers (25)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (632 KB)

    The paper presents a simple and rapid algorithm for numerically evaluating the probability density function (pdf) of intersymbol interference (ISI) in digital transmission systems. The results coincide with the analytical solutions available for very few cases only. The biterror rate calculated from the pdf's of ISI and of Gaussian noise agree with upper and lower bounds as published by many autho... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Dual-Tone Multifrequency Receiver Using Synchronous Additions and Subtractions

    Publication Year: 1987, Page(s):414 - 418
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    This paper describes a new detection algorithm for a dualtone multifrequency (DTMF) signal. The new algorithm basically uses only additions and subtractions but no multiplications. A signaling tone can be detected by sampling an input signal at four times each frequency involved in a signaling tone and accumulating these sampled values synchronously by additions and subtractions. This algorithm is... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Evaluation of Point-to-Point Network Routing Algorithms

    Publication Year: 1987, Page(s):470 - 472
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    A sampling of routing algorithms is evaluated through simulation. The algorithms selected are random walk, fixed directory, split traffic, isolated shortest queue (hot potato) and backward learning. Backward learning exhibited the most desirable characteristics, approaching fixed directory routing in delay and path length, while adapting to link failures. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Optical Amplifier Applications in Fiber Optic Local Networks

    Publication Year: 1987, Page(s):419 - 426
    Cited by:  Papers (21)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (776 KB)

    The number of waveguide taps N that a passive optical fiber bus can accommodate is typically quite low, due to significant attenuation of the signal in the taps and splices. In an effort to increase N substantially, this paper investigates the potential use of optical amplifiers to boost the signal along the bus. An analysis... 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
Naofal Al-Dhahir
University of Texas at Dallas