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IEEE Transactions on Communications

Issue 5 • Date May 1994

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Displaying Results 1 - 15 of 15
  • A simple depolarization compensator for very wideband communications links an experimental evaluation

    Publication Year: 1994, Page(s):2073 - 2077
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    A simple cancellation-type compensator was built and subjected to limited testing in a terrestrial link using dual polarization frequency reuse (DPFR) with 3.2 Gb/s in each polarization. A wideband complex (four quadrant) weighting circuit was developed which was capable of about 20 dB of cancellation at midband in a 3.4 GHz band. Control of the weighting circuit was effected by use of two pilot t... View full abstract»

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  • Jitter and clock recovery for periodic traffic in broadband packet networks

    Publication Year: 1994, Page(s):2189 - 2196
    Cited by:  Papers (19)  |  Patents (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (772 KB)

    The transparent transport of real-time periodic traffic through a broadband packet network requires the recovery of source clock frequency at the destination. The arriving packet stream at the destination buffer contains the source clock frequency information, which can be recovered by monitoring the buffer level, and using it to adjust the destination clock frequency without buffer under- or over... View full abstract»

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  • A new look into the acquisition properties of a second-order digital phase locked loop

    Publication Year: 1994, Page(s):2087 - 2091
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    With the help of real-time numerical simulation results, the acquisition properties of a second-order ZC1-DPLL are investigated. Besides confirming the sensitivity of the system dynamics to the initial values of the state variables, it predicts qualitatively the maximum possible frequency acquisition range (FAR) of the system, and obtains the values of the maximum FAR for systems with d... View full abstract»

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  • Packet loss due to encryption in space data systems

    Publication Year: 1994, Page(s):2119 - 2126
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (592 KB)

    This paper analyzes the probabilities of data packet loss for both an encrypted channel in self-synchronous cipher feedback mode and a nonencrypted channel, in the space data systems. Simulation results show reasonable agreement with analytical results. When channel bit error probability is 10-5 and the total number of packets per frame is 3, the analytical model gives 0.39% packet loss... View full abstract»

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  • Performance comparison of two input access methods for a multicast switch

    Publication Year: 1994, Page(s):2174 - 2178
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    A comparison of the performance of two input access mechanisms for multicast switching is presented. The first of these-a cyclic priority input access method-is a derivative of the ring token reservation method which eliminates the unfairness of the ordinary ring token reservation. It has the advantage of being relatively simple and easy to implement. A second approach employs a neural network to ... View full abstract»

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  • A simplified performance evaluation for bursty multiclass traffic in ATM systems

    Publication Year: 1994, Page(s):2078 - 2083
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    In broadband ISDN with ATM, various kinds of traffic, such as voice, data and video, share the common transmission resource. For such multiclass traffic systems, it is necessary to evaluate the grade of service (GOS) for individual traffic. In particular, for the ATM networks integrating voice and video which are of bursty property and delay sensitive, the individual performance evaluation for the... View full abstract»

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  • Stability evaluation and design of the PRMA joint voice data system

    Publication Year: 1994, Page(s):2092 - 2104
    Cited by:  Papers (60)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (996 KB)

    Packet reservation multiple access (PRMA) provides spatially dispersed voice and data terminals wireless access to a base station over a common short-range radio channel. The author presents an equilibrium point analysis of the joint voice data system. The analysis leads to two coupled nonlinear equations. By a judicious change of variables, the author calculates the equilibrium of the joint syste... View full abstract»

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  • Channel assignments for improved gain in baseband array feed compensation systems

    Publication Year: 1994, Page(s):2127 - 2133
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    The performance of a real-time digital combining system for use with array feeds has been considered in previous articles. The purpose of the combining operation is to recover signal-to-noise ratio (SNR) losses due to antenna deformations and atmospheric effects. Previously, arbitrary signal powers and noise variances were assumed, but no attempt was made to match the receiver channels to the avai... View full abstract»

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  • Generating a fault-tolerant global clock using high-speed control signals for the MetaNet architecture

    Publication Year: 1994, Page(s):2179 - 2188
    Cited by:  Papers (29)  |  Patents (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (904 KB)

    Describes a new technique, based on exchanging control signals between neighboring nodes, for constructing a stable and fault-tolerant global clock in a distributed system with an arbitrary topology. It is shown that it is possible to construct a global clock reference with a time step that is much smaller than the propagation delay over the network's links. The synchronization algorithm ensures t... View full abstract»

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  • Rearrangeable nonblocking Log2d (N, m, p) networks

    Publication Year: 1994, Page(s):2084 - 2086
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    Previously, a new class of switching networks, called Log2 (N, m, p) networks, has been created for high-speed switching systems. The basic switching element used is a 2×2 crossbar. Although it is generally true that different sizes of switching elements can be used as the basic building block for the same design paradigm, the results are quite different. The sizes of the basic b... View full abstract»

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  • Theory of polarization spreading techniques. I

    Publication Year: 1994, Page(s):2105 - 2118
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1084 KB)

    Presents an analysis of a series of techniques grouped under the denomination “polarization spreading”, the intent of which is that of making the performance of a coherent optical receiver insensitive to the polarization transformations occurring along the optical fiber, without resorting to polarization compensation or control. The principle on which Polarization spreading operates is... View full abstract»

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  • Data-driven echo cancellation for a multitone modulation system

    Publication Year: 1994, Page(s):2134 - 2144
    Cited by:  Papers (10)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (760 KB)

    The problem of echo cancellation in a multitone modulation (MTM) scheme is addressed. A general model for the near-end echo is derived and is used to identify candidate data-driven echo canceller (DDEC) structures. The stability, steady state performance, and associated system complexity of an adaptive DDEC based on the stochastic gradient approach is developed. It is further shown how the symmetr... View full abstract»

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  • Dynamic finite-state vector quantization of digital images

    Publication Year: 1994, Page(s):2145 - 2154
    Cited by:  Papers (41)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1200 KB)

    A vector quantization (VQ) scheme with finite memory called dynamic finite-state vector quantization (DFSVQ) is presented. The encoder consists of a large codebook, so called super-codebook, where for each input vector a fixed number of its codevectors are chosen to generate a much smaller codebook (sub-codebook). This sub-codebook represents the best matching codevectors that could be found in th... View full abstract»

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  • Parallel acquisition of PN sequences in DS/SS systems

    Publication Year: 1994, Page(s):2155 - 2164
    Cited by:  Papers (56)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (800 KB)

    The authors investigate methods for the parallel acquisition of a PN sequence in a baseband direct sequence spread spectrum system. Four different schemes are considered: the optimal estimation scheme, the maximum-likelihood estimation scheme, a hypothesis-testing scheme that searches over all shifts, and a locally optimum detection scheme. Approximate expressions for the probability of error are ... View full abstract»

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  • Robust feature detection for signal interception

    Publication Year: 1994, Page(s):2165 - 2173
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (632 KB)

    The problem of detecting the presence of direct sequence spread-spectrum signals in noise is considered, and the detector consisting of a filter followed by a delay-and-multiply device is optimized with respect to the filter bandwidth and the delay to maximize robustness to errors in assumed values of pulse rate and carrier frequency. Output SNR is used for performance optimization, and the result... 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