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IEEE Transactions on Communications

Issue 7 • Date Jul 1995

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Displaying Results 1 - 14 of 14
  • Variable rate QAM for mobile radio

    Publication Year: 1995, Page(s):2223 - 2230
    Cited by:  Papers (283)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    Quadrature amplitude modulation (QAM) schemes which vary the number of modulation levels in accordance with the mobile radio fading channel variations are investigated. Important parameters considered are the fading rate and the block size used. We describe how the adaptive QAM modems can be employed and consider their use in a DECT-like TDD packet structure. System performance in the presence of ... View full abstract»

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  • A multirate acoustic echo canceler structure

    Publication Year: 1995, Page(s):2172 - 2176
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    A new subband echo canceler (SBEC) structure is proposed to reduce the transmission delay introduced by conventional SBEC structures, without distorting the near-end signal. The proposed structure is based on computing two output errors, one for using during single-talk and the other one for using during double-talk periods. With the SBEC structure we propose a double-talk detector with a subband ... View full abstract»

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  • Blind equalization by direct examination of the input sequences

    Publication Year: 1995, Page(s):2213 - 2222
    Cited by:  Papers (31)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (824 KB)

    This paper presents a novel approach to blind equalization (deconvolution), which is based on direct examination of possible input sequences. In contrast to many other approaches, it does not rely on a model of the approximative inverse of the channel dynamics. To start with, the blind equalization identifiability problem for a noise-free finite impulse response channel model is investigated. A ne... View full abstract»

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  • Simultaneous clock phase and frequency offset estimation

    Publication Year: 1995, Page(s):2263 - 2270
    Cited by:  Papers (49)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (640 KB)

    Residual frequency offsets may often result in poor functioning of a digital receiver. This is particularly true in a frequency selective environment where an adaptive equalizer may be required. In this paper, a frequency offset estimation algorithm is presented which is based on applying a nonlinear operation on the received sampled baseband signal. Tones at multiples of the clock frequency are p... View full abstract»

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  • A lower bound on the mean square error of symbol timing recovery for NRZ rectangular signals

    Publication Year: 1995
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (64 KB)

    In this paper which is based on previous work (see ibid., vol.40, p.1635, 1992), a closed-form lower bound on the mean square error of symbol timing recovery is reported for NRZ rectangular pulse sequences. The bound is a function of the fundamental parameters Eb the symbol energy and N0 the noise power spectral density View full abstract»

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  • Pilot symbol assisted modulation and differential detection in fading and delay spread

    Publication Year: 1995, Page(s):2206 - 2212
    Cited by:  Papers (35)  |  Patents (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    Pilot symbol assisted modulation (PSAM) has previously been shown to give good performance in flat fading, noise and cochannel interference. The present paper analyzes its performance in ISI due to frequency selective fading, and provides a similar analysis of differential detection for comparison. The paper also introduces a method for performing the formidable average over transmitted data patte... View full abstract»

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  • Spur-reduced digital sinusoid synthesis

    Publication Year: 1995, Page(s):2254 - 2262
    Cited by:  Papers (39)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (772 KB)

    This paper presents and analyzes a technique for reducing the spurious signal content in digital sinusoid synthesis. Spur reduction is accomplished through dithering amplitude and phase values prior to wordlength reduction. The analytical approach developed for analog quantization is used to produce new bounds on spur performance in these dithered systems. Amplitude dithering allows output wordlen... View full abstract»

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  • Adaptive nondisruptive measurement of harmonic distortion for voiceband data transmission

    Publication Year: 1995, Page(s):2184 - 2200
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1392 KB)

    Volterra functional expansions are power series with memory that explicitly characterize the input/output relationship of a finite-memory single-valued nonlinear black box whenever the latter is time-invariant and stable. The purpose of this paper is to introduce and report on the strengths and weaknesses of two distinct Volterra-series-type classes of adaptive nonlinear techniques for the quantit... View full abstract»

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  • On a class of Banyan networks and tandem Banyan switching fabrics

    Publication Year: 1995, Page(s):2231 - 2240
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (864 KB)

    This paper examines the operating characteristics of a class of tandem Banyan switching fabrics (TBSF's) built using bi-delta networks. We use the functional equivalence between bi-delta networks to induce an equivalence between TBSF's. A weaker form of equivalence guaranteeing identical performance under conditions of symmetric traffic is studied, and a sufficient condition for weak equivalence b... View full abstract»

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  • A new adaptive hybrid ARQ scheme

    Publication Year: 1995, Page(s):2169 - 2171
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    First Page of the Article
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  • Image compression using VQ-BTC

    Publication Year: 1995, Page(s):2177 - 2182
    Cited by:  Papers (25)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (648 KB)

    Vector quantization (VQ) and block truncation coding (BTC) are successful image compression techniques. However, a reproduced image using VQ or BTC suffers from edge degradation. A new technique that combines the advantages of both VQ and BTC to combat this degradation is presented and is referred to as VQ-BTC. In VQ-BTC, a low-detail block is encoded using VQ. For a high-detail block, a modificat... View full abstract»

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  • Extension of the normalized two-ray transfer-function model to a space-diversity line-of-sight link

    Publication Year: 1995, Page(s):2271 - 2280
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (820 KB)

    Many methods for the prediction of multipath effects on the availability of a digital microwave line-of-sight link use a mathematical and statistical modeling of the propagation channel transfer function. Such a method, making use of the normalized two-ray model and adapted to a nonprotected hop, has been presented in a previous paper. In this paper we investigate the possibility to extend this mo... View full abstract»

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  • Optimum transmission ranges in multihop packet radio networks in the presence of fading

    Publication Year: 1995, Page(s):2201 - 2205
    Cited by:  Papers (85)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    The evaluation of optimum transmission ranges in a packet radio network in a fading and shadowing environment is considered. It is shown that the optimal probability of transmission of each user is independent of the system model and is po≃0.271. The optimum range should be chosen so that on the average there are χ(G/b)2η/ terminals closer to the transmitter than... View full abstract»

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  • Performance of packet-switched fiber-optic frequency-hopping multiple-access networks

    Publication Year: 1995, Page(s):2241 - 2253
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1140 KB)

    A packet-switched frequency-hopping multiple-access (FO-FHMA) communication system based on bus topology is proposed and investigated. In this arrangement, access to the optical medium for the network subscribers is provided via frequency-hopping (FH). The proposed FH technique in this analysis takes advantage of the Reed-Solomon (RS) codes to encode information packets and, consequently, to comba... 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.

 

 

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Meet Our Editors

Editor-in-Chief
Naofal Al-Dhahir
University of Texas at Dallas