IEEE Transactions on Communications

Issue 4 • April 1996

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Displaying Results 1 - 17 of 17
  • Comments on a widely used capture model for slotted ALOHA

    Publication Year: 1996
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (113 KB)

    Previously (see ibid., vol.41, no.9, p.1364, 1993), the capture phenomenon in nonbit-synchronous mobile packet radio networks for binary phase shift keying (BPSK) and differential phase shift keying (DPSK) modulation was investigated. Most of the analysis is correct. Unfortunately, the mathematical expressions for state transition probabilities, adopted from previous work, have errors. Over a deca... View full abstract»

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  • Adaptive type-II hybrid broadcast ARQ system

    Publication Year: 1996, Page(s):420 - 422
    Cited by:  Papers (17)  |  Patents (77)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    In this letter, a type-II hybrid broadcast automatic-repeat-request (ARQ) scheme with adaptive forward error correction (AFEC) using BCH codes is proposed and analyzed. The basic idea in the proposed scheme is to increase the error correcting capability of BCH codes according to each channel state using incremental redundancy. The numerical results for the analysis and the simulation show that the... View full abstract»

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  • Analysis of the pairwise error probability of noninterleaved codes on the Rayleigh-fading channel

    Publication Year: 1996, Page(s):456 - 463
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (736 KB)

    The majority of previous analytical studies of signal-space coding techniques (includes trellis and block codes) on the Rayleigh-fading channel have assumed ideal interleaving. The effect of finite interleaving on the performance of different coding schemes has been studied only by simulation In this paper we first derive a maximum likelihood (ML) decoder for codewords transmitted over a noninterl... View full abstract»

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  • Decision feedback differential detection of differentially encoded 16APSK signals

    Publication Year: 1996, Page(s):416 - 418
    Cited by:  Papers (35)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    Multiple-symbol differential detection (DD) with reference signal estimation based on the feedback of past detected symbols is presented for differentially encoded 16-level amplitude/phase shift keying (16DAPSK). A suboptimal decision is derived. The approximate analysis of the bit-error rate (BER) performance taking into account the decision error propagation effect is presented in an additive wh... View full abstract»

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  • Bayesian techniques for known channel deconvolution

    Publication Year: 1996, Page(s):448 - 455
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (832 KB)

    This paper introduces a new family of deconvolution filters for digital communications subject to severe intersymbol interference. These fixed lag smoothing filters for known channel demodulation are called Bayesian filters. Bayesian filters are derived using a new approach to suboptimal recursive minimum mean square error estimation for non-Gaussian processes. The family of Bayesian filters inter... View full abstract»

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  • Error rate performance of the projection code

    Publication Year: 1996, Page(s):413 - 415
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (188 KB)

    The operation of the projection code is introduced, and the error rate performance is determined. A new combinatorial generating function technique is used to compute the weight distribution of a cylindrical projection code, which is then employed to obtain upper and lower bounds of the bit error rate of the code. We then apply a state equation technique to compute the generating function of a con... View full abstract»

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  • Nonsymmetric sources and optimum signal selection

    Publication Year: 1996, Page(s):440 - 447
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (644 KB)

    There are some applications where the information source is nonsymmetric. Here, it is shown that differential pulse code modulation (DPCM) of video signals results in a nonsymmetric source. Previous works on 2-D signal design have been focused around equally likely sources. In this paper, an iterative algorithm for minimum error signal design subject to average power (or peak power) constraint is ... View full abstract»

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  • Hop-timing estimation for FH signals using a coarsely channelized receiver

    Publication Year: 1996, Page(s):516 - 526
    Cited by:  Papers (21)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1076 KB)

    This paper addresses new hop-timing (epoch) estimation schemes which employ a coarsely channelized preprocessor in order to suppress the frequency and phase dependence in random frequency-hopping (FH) signals. Coarse channelization implies a bank of filters, covering the total spread bandwidth of the FH signal, whose number is much smaller than the size of the candidate hop frequency set. Linear a... View full abstract»

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  • Cryptographic redundancy and mixing functions

    Publication Year: 1996, Page(s):423 - 426
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    This paper studies the use of structures based on error correcting codes to achieve secrecy rather than error control. In many cases, however, the same code can achieve both error control and secrecy. It describes an optimal construction for combining multiple semisecure channels, e.g., a bundle of fiber-optic cables or reels of tape sent by independent couriers, into a single channel with much hi... View full abstract»

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  • Packet output processes of CSMA and CSMA/CD protocols

    Publication Year: 1996, Page(s):464 - 474
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1072 KB)

    This paper considers a generic CSMA and CSMA/CD protocol that allows one to unify the nonpersistent and one-persistent protocols as special cases, and solve the characterization problem under the infinite population model. Explicit expressions of the interdeparture time moment generating function, as well as expressions for the channel throughput and the variance of output process, are obtained fo... View full abstract»

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  • Optimum Reed-Solamon codes for M-ary FSK modulation with hard decision decoding in Rician-fading channels

    Publication Year: 1996, Page(s):409 - 412
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    M-ary frequency shift keying (MFSK) is a power-efficient modulation method that is useful for low power and low data rate applications. The power efficiency of this modulation method increases as the signal alphabet increases at the expense of increased complexity and reduced bandwidth efficiency. We present an analysis of its uncoded and coded performance in Rician-fading channels using noncohere... View full abstract»

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  • The error probability of M-ary PSK block coded modulation schemes

    Publication Year: 1996, Page(s):427 - 433
    Cited by:  Papers (33)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    A tight upper bound on the decoding error probability is derived for block-coded modulation structures where an M-ary phase shift keying (M-PSK) signal constellation is employed. This bound, called a tangential sphere bound, is tight for very low (as well as for high) signal-to-noise ratios (SNRs). Berlekamp's tangential union bound, previously derived for binary codes, can be derived for an M-PSK... View full abstract»

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  • Computation of the coding gain for subband coders

    Publication Year: 1996, Page(s):475 - 487
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1108 KB)

    A procedure to evaluate the coding gain for 2-D subband systems is explicitly presented. The technique operates in the signal domain and requires the knowledge of the input process auto-correlation function. Both the case of uniform subband and pyramid decomposition are considered. In the case of a separable input process spectrum, the evaluation can be performed by considering appropriately defin... View full abstract»

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  • A unified approach to selecting optimal step lengths for adaptive vector quantizers

    Publication Year: 1996, Page(s):434 - 439
    Cited by:  Papers (10)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (588 KB)

    This paper presents expressions for the optimal step length to use when training a vector quantizer by stochastic approximation. By treating each update as an estimation problem, it provides a unified framework covering both batch and incremental training, which were previously treated separately, and extends existing results to the semibatch case. In addition, the new results presented provide a ... View full abstract»

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  • Training analysis of adaptive interference suppression for direct-sequence code-division multiple-access systems

    Publication Year: 1996, Page(s):488 - 495
    Cited by:  Papers (43)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (720 KB)

    This paper studies the transient behavior of an adaptive near-far resistant receiver for direct-sequence (DS) code-division multiple-access (CDMA) known as the minimum mean-squared error (MMSE) receiver. This receiver structure is known to be near-far resistant and yet does not require the large amounts of side information that are typically required for other near-far resistant receivers. In fact... View full abstract»

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  • Finite precision decorrelating receivers for multiuser CDMA communication systems

    Publication Year: 1996, Page(s):496 - 507
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1068 KB)

    The design of single-user decorrelating receivers employing finite-precision sequences for despreading is considered. The problem is formulated as a nonlinear bounded integer optimization problem which is shown to be network performance (NP)-hard. A branch-and-bound algorithm for finding the best finite-precision decorrelating sequence is described. Numerical examples demonstrate that the loss in ... View full abstract»

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  • New nonlinear algorithms for estimating and suppressing narrowband interference in DS spread spectrum systems

    Publication Year: 1996, Page(s):508 - 515
    Cited by:  Papers (39)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (736 KB)

    It has been shown that the narrowband (NB) interference suppression capability of a direct-sequence (DS) spread spectrum system can be enhanced considerably by processing the received signal via a prediction error filter. The conventional approach to this problem makes use of a linear filter. However, the binary DS signal, that acts as noise in the prediction process, is highly non-Gaussian. Thus,... 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