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IEEE Transactions on Communications

Issue 10 • Oct 1992

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Displaying Results 1 - 15 of 15
  • Performance bounds for DS/SSMA communications with complex signature sequences

    Publication Year: 1992, Page(s):1607 - 1614
    Cited by:  Papers (41)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (620 KB)

    A unified performance analysis of direct-sequence spread-spectrum multiple-access (DS/SSMA) communications with deterministic complex signature sequences is presented. The probability density function (PDF) of the multiple-user interference is determined. Using a round-down and round-up procedure on the PDF, arbitrarily tight lower and upper bounds on the probability of bit error (PBE) are obtaine... View full abstract»

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  • A new method for the integration of modulation and channel coding in an ARQ protocol

    Publication Year: 1992, Page(s):1594 - 1606
    Cited by:  Papers (19)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (988 KB)

    A method for the integration of the modulation operation in an automatic-repeat-request (ARQ) scheme is described. This method uses a memory for the successive transmissions of a codeword and, through a suitable encoding operation, the Euclidean distances among the codewords are significantly increased with the number of transmissions. The application of the described method to some different modu... View full abstract»

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  • Sequential decoding with an efficient incremental redundancy ARQ scheme

    Publication Year: 1992, Page(s):1588 - 1593
    Cited by:  Papers (12)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    Sequential decoding is analyzed in conjunction with an efficient incremental redundancy automatic repeat request (ARQ) scheme using punctured convolutional coding. With the incremental redundancy ARQ scheme, whenever the decoding time of a given data packet exceeds some predetermined value Tmax, decoding of that data packet is stopped and incremental redundancy bits are provide... View full abstract»

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  • Parallel demodulation of multidimensional signals

    Publication Year: 1992, Page(s):1581 - 1587
    Cited by:  Papers (9)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (564 KB)

    The design of constellations that allow a high degree of parallelism in the staged decoder structure and in addition allow soft decoding of the component algebraic codes based on a systolic algorithm amenable to VLSI implementation is considered. Combination of these multidimensional constellations with trellis-coded modulation (TCM) is also considered. Set partitioning is based on the partition o... View full abstract»

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  • Capture probability in a mobile packet radio system

    Publication Year: 1992, Page(s):1577 - 1580
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (228 KB)

    The probability of qi of successful packet reception when i users transmit simultaneously in a mobile packet radio system is shown to decrease monotonically with i for a number of commonly used capture and spatial distribution models, with no fading. Examples of both noiseless and noisy systems in which qi is not monotonically decreasing wi... View full abstract»

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  • Hybrid DS/SFH-SSMA with predetection diversity and coding over indoor radio multipath Rician-fading channels

    Publication Year: 1992, Page(s):1654 - 1662
    Cited by:  Papers (28)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (724 KB)

    The authors investigate the bit-error-rate (BER) performance of hybrid direct-sequence/slow-frequency-hopped spread-spectrum multiple-access (DS/SFH-SSMA) systems operating over a multipath Rician-fading channel (which models indoor radio propagation in factories). They consider both phase-shift-keying (PSK) modulation with coherent demodulation and differential phase-shift-keying (DPSK) modulatio... View full abstract»

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  • On the application of the Cramer-Rao and detection theory bounds to mean square error of symbol timing recovery

    Publication Year: 1992, Page(s):1635 - 1643
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (640 KB)

    A modified Cramer-Rao bound is derived that takes account of the fact that the symbol timing estimate is restricted to a finite interval of one symbol duration. A detection theory bound is also applied to the symbol timing problem. Results obtained using the Cramer-Rao and detection theory bounds are compared. It is shown that the detection theory bound is superior to the traditionally used Cramer... View full abstract»

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  • A scheme for high performance real-time BER measurement

    Publication Year: 1992, Page(s):1574 - 1576
    Cited by:  Papers (8)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    A statistically based method of bit error rate (BER) which does not necessitate the transmission of test patterns or the interruption of data for measurement purposes is presented. It is demonstrated that the method allows accurate estimation of BER several orders of magnitude faster than the Monte Carlo method. Design of an optimal BER estimator based on the maximum-likelihood principle is propos... View full abstract»

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  • Performance analysis of a duplex multicast switch

    Publication Year: 1992, Page(s):1615 - 1624
    Cited by:  Papers (6)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (764 KB)

    A multicast switching architecture called a duplex multicast switch is proposed, and several switch control algorithms are developed. A duplex multicast switch, with two point-to-point routing nets, has potential to provide significantly better performance than a simplex multicast switch by reducing the output loadings of routing nets. To fully realize its potential, two call distribution algorith... View full abstract»

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  • Decision-directed burst-mode carrier synchronization techniques

    Publication Year: 1992, Page(s):1644 - 1653
    Cited by:  Papers (34)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (796 KB)

    A decision-directed, digitally implemented carrier synchronizer for channels with both frequency and phase uncertainty is presented. This combined algorithm and its derivatives are analyzed with respect to the achievable carrier acquisition time and the resulting bit error probability. For certain data rates (approximately 50 MSps or less), this algorithm can be implemented using CMOS gate array t... View full abstract»

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  • The statistical data fork: a class of broad-band multichannel switches

    Publication Year: 1992, Page(s):1625 - 1634
    Cited by:  Papers (23)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (800 KB)

    The circuit switching concept of trunk grouping has been introduced into the broadband packet switch. This trunk grouping concept exploits the very high bandwidth offered by lightwave technology with electronic switching technology operating at substantially slower speeds. A key component of this concept is the multichannel switch, which is a device capable of supporting routing requirements at th... View full abstract»

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  • An extended Berlekamp-Massey algorithm for the inversion of Toeplitz matrices

    Publication Year: 1992, Page(s):1557 - 1561
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    The Berlekamp-Massey algorithm (BMA) which solves special Toeplitz systems of linear equations is extended to an algorithm for inverting Toeplitz matrices. The original BMA itself leads to one row of the inverse of the corresponding Toeplitz matrix. The other rows are derived using the same operations that are central to the original BMA. Two alternatives for the extended BMA are presented: the fi... View full abstract»

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  • Trellis quantization with MAP detection for noisy channels

    Publication Year: 1992, Page(s):1562 - 1565
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    Maximum a posteriori (MAP) detection is applied to trellis quantizers operating over additive white Gaussian noise (AWGN) channels. The use of the MAP method instead of maximum likelihood is motivated by the fact that the source coder output probabilities, conditioned on the previous outputs (i.e. the state), are not equal. Simulation results indicate that by using MAP detection instead of maximum... View full abstract»

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  • Error performance of multiple-symbol differential detection of PSK signals transmitted over correlated Rayleigh fading channels

    Publication Year: 1992, Page(s):1566 - 1569
    Cited by:  Papers (122)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    The error performance of multiple-symbol differential detection of uncoded QPSK signals transmitted over correlated Rayleigh fading channels is studied. The optimal detector is presented, along with an exact expression for the corresponding pairwise error event probability. It is shown that multiple-symbol differential detection is a very effective strategy for eliminating the irreducible error fl... View full abstract»

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  • A comparison of hashing schemes for address lookup in computer networks

    Publication Year: 1992, Page(s):1570 - 1573
    Cited by:  Papers (56)  |  Patents (25)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    Using a trace of address references, the author compares the efficiency of several different hashing functions such as cyclic redundancy checking polynomials, Fletcher checksum, folding of address octets using the exclusive-OR operation, and bit extraction from the address. Guidelines are provided for determining the size of hash masks required to achieve a specified level of performance 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