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IEEE Transactions on Communications

Issue 4 • Apr 1993

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Displaying Results 1 - 18 of 18
  • Adaptive forwarding in frequency-hop spread-spectrum packet radio networks with partial-band jamming

    Publication Year: 1993, Page(s):613 - 620
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (796 KB)

    Adaptive protocols that specify the ways in which a radio is permitted to modify its normal forwarding procedures based on information obtained locally in the network are considered. A computer program has been developed to simulate a frequency-hop (FH) packet radio network with partial-band jamming and interference due to other FH and narrowband radios. The radios in the network use time-slotted,... View full abstract»

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  • Some ARQ protocols with finite receiver buffer

    Publication Year: 1993, Page(s):513 - 523
    Cited by:  Papers (7)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (724 KB)

    Some new schemes for communication systems using error-detecting codes are described. These schemes use hybrid strategies for the retransmission of the codewords detected in error, and combine the advantages of the go-back-N and selective protocols. The memory, introduced at the receiver side, enhances their performance with respect to the classical schemes. The results show that the prot... View full abstract»

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  • Motion-compensating prediction with fractional-pel accuracy

    Publication Year: 1993, Page(s):604 - 612
    Cited by:  Papers (146)  |  Patents (49)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (772 KB)

    The effect of fractional-pel accuracy on the efficiency of motion-compensating predictors is studied using various spatial prediction/interpolation filters. In model calculations, the power spectral density of the prediction error is related to the probability density function of the displacement error. Prediction can be improved both by higher accuracy of motion-compensation and by spatial Wiener... View full abstract»

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  • A stopping rule for link failure detection

    Publication Year: 1993, Page(s):528 - 530
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    If an acknowledgement is not received for a data packet transmitted along a given virtual circuit, acknowledgement requests can be sent to discover whether the link has failed. A derivation is given for the optimal value of the maximum number of requests View full abstract»

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  • Performance of power-controlled wideband terrestrial digital communication

    Publication Year: 1993, Page(s):559 - 569
    Cited by:  Papers (177)  |  Patents (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (760 KB)

    Performance of a wideband multipath-fading terrestrial digital coded communication system is treated. The analysis has applications to a cellular system using direct-sequence spread-spectrum code-division multiaccess (CDMA) with M-ary orthogonal modulation on the many-to-one reverse (user-to-base station) link. For these links, power control of each multiple-access user by the cell base s... View full abstract»

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  • Area-efficient architectures for the Viterbi algorithm. I. Theory

    Publication Year: 1993, Page(s):636 - 644
    Cited by:  Papers (38)  |  Patents (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (864 KB)

    In the state-parallel implementation of the Viterbi algorithm, one add-compare-select (ACS) unit is devoted to each state in the treillis. A systematic approach to partitioning, scheduling, and mapping N trellis states to P ACSs, where N>P , is presented here. The area saving of this architecture comes from the reduced number of ACSs and interconnection wires... View full abstract»

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  • Symbol timing recovery in digital subscribers loops in the presence of residual echo and crosstalk

    Publication Year: 1993, Page(s):544 - 549
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    A general analysis is presented for the jitter performance of a common symbol timing recovery (STR) system used in a digital subscriber loop (DSL) transceiver that uses adaptive echo cancellation for high-speed digital communications. Exact analytical expressions for the mean and variance of the timing wave and for the RMS phase jitter are derived as a function of the bandwidth of the postfilter f... View full abstract»

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  • A class of directional-coupler-based photonic switching networks

    Publication Year: 1993, Page(s):599 - 603
    Cited by:  Papers (21)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    A class of photonic switching networks composed of directional couplers is proposed. These networks require only two switching stages containing active elements. Both point-to-point and multicast architectures are presented. Various characteristics of the networks are compared to those of networks previously known with respect to insertion loss, SNR, number of crossovers, and number of active elem... View full abstract»

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  • A multicast broadband packet switch

    Publication Year: 1993, Page(s):621 - 630
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (776 KB)

    A multicast broadband packet switch architecture is proposed. It has the following attractive features: little extra cost compared to a unicast switch, fast packet duplication, and easy addition and deletion of calling parties. A simulation study of this multicast system is presented to verify its performance View full abstract»

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  • Conditions for 90° phase-invariant block-coded QAM

    Publication Year: 1993, Page(s):524 - 527
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    Based on V.A. Zinoviev's (1981) generalized concatenated codes, conditions for the construction of 90° phase-invariant QAM are derived. Furthermore, a proposal for the necessary differential encoding/decoding is made. The conditions for phase invariance are specialized for the case of Reed-Muller codes as outer codes of the generalized concatenation View full abstract»

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  • Steady-state analysis of the MMPP/G/1/K queue

    Publication Year: 1993, Page(s):531 - 534
    Cited by:  Papers (29)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    An exact analysis of the MMPP/G/1/K queuing model is carried out, yielding the whole buffer occupancy probability distribution and in particular the loss probability. The solution is obtained by an algorithmic procedure and requires only algebraic manipulations. An expression for the Laplace-Stieltjes transform of the virtual waiting time distribution is derived View full abstract»

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  • A protocol for cellular radio signaling channels carrying data and high-priority accessing requests

    Publication Year: 1993, Page(s):570 - 582
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1172 KB)

    In cellular radio, accessing requests are transmitted through signaling channels in the form of minipackets. The accessing requests are generated by a variety of mobile users that impose different constraints. The authors consider data and high-priority public-safety cellular users and isolate a single channel that is shared by the mixed user population. They devise and analyze a mixed protocol th... View full abstract»

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  • Extremal properties of likelihood-ratio quantizers

    Publication Year: 1993, Page(s):550 - 558
    Cited by:  Papers (77)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (820 KB)

    M hypotheses and a random variable Y with a different probability distribution under each hypothesis are considered. A quantizer is applied to form a quantized random variable γ(Y ). The extreme points of the set of possible probability distributions of γ(Y), as γ ranges over all quantizers, is characterized. Optimality properties of likelihood... View full abstract»

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  • On minimizing the peak-to-average power ratio for the sum of N sinusoids

    Publication Year: 1993, Page(s):631 - 635
    Cited by:  Papers (38)  |  Patents (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    A new derivation is presented of a previously known relationship for phasing N equal-amplitude, equally spaced (in frequency) sinusoids so that the peak-to-average power ratio of their sum is 2.6 dB. The method of derivation provides intuitive insight into why this result is possible, and shows that the 2.6 dB figure is obtained independently of N as long as N is large. ... View full abstract»

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  • A fast-adaptive Huffman coding algorithm

    Publication Year: 1993, Page(s):535 - 538
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    The Huffman code in practice suffers from two problems: the prior knowledge of the probability distribution of the data source to be encoded is necessary, and the encoded data propagate errors. The first problem can be solved by adaptive coding, while the second problem can be partly solved by segmenting data into segments. However, the adaptive Huffman code performs badly when segmenting data int... View full abstract»

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  • Revenue optimization of telecommunication networks

    Publication Year: 1993, Page(s):583 - 591
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (672 KB)

    The optimal routing and dimensioning of circuit-switched networks operating with call revenues is examined, and F.P. Kelly's (1988) model is extended in two directions. First, the formulation is transformed in such a way that the optimality equations are significantly easier to derive, and another interpretation of Kelly's induced costs is given. Alternative routing is introduced, the correspondin... View full abstract»

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  • A speech/voiceband data discriminator

    Publication Year: 1993, Page(s):539 - 543
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    The problem of distinguishing speech from voiceband data is treated. A discrimination function based on the sign of the autocorrelation at lag two of the incoming signal and the second-order moment of the complex low-pass signal is presented. The algorithm has been applied to many types of voiceband data signals and, within a window of 32 ms, correctly classifies them. For the limited number of sp... View full abstract»

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  • Multichannel ARQ protocols

    Publication Year: 1993, Page(s):592 - 598
    Cited by:  Papers (14)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (564 KB)

    The performance of stop-and-wait, go-back-N, and selective-repeat ARQ protocols is examined for a multichannel system. The channels can either operate independently or jointly. For each protocol, the results obtained include throughput efficiency and delay. The results are also validated by computer simulations. The performance is compared to that of the single-channel system under the co... 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