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Frequency Division (frequency + division)

Distribution by Scientific Domains
Engineering100%

Terms modified by Frequency Division

  • frequency division multiplexing
    		•

    Selected Abstracts

    Performance analysis of a reuse partitioning technique for multi-channel cellular systems supporting elastic services,

    INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS, Issue 3 2009
    Gábor Fodor
    Abstract For multi-cell systems employing intra-cell orthogonal communication channels, inter-cell interference mitigation techniques are expected to be one of the key radio resource management functions. In this paper we propose and analyze a simple reuse partitioning technique (with random and coordinated resource block allocation in neighbor cells) that is able to reduce inter-cell interference. We propose a model that is able to take into account that sessions dynamically enter and leave the system. Rigid sessions require a class-specific fixed number of resource blocks, while elastic sessions can enter the system if a minimum number of resources are allocated to them. In this rather general setting (and using the example of a system employing frequency division for multiple access) we analyze the system performance in terms of the expected number of channel collisions, the session-blocking probabilities, the signal-to-interference-and-noise ratio (SINR) and packet error rate performance. We present numerical results on the various trade-offs between these measures (including the trade-off between the reuse factor and the SINR performance) that provide insight into the behavior of multi-channel cellular systems and help dimensionalize the parameters of a reuse partitioned system. Copyright © 2008 John Wiley & Sons, Ltd. [source]

    Extension of the exhaustive Gaussian approach for BER estimation in experimental direct-detection OFDM setups

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 12 2010
    Tiago M. F. Alves
    Abstract An extension of the exhaustive Gaussian approach to estimate the bit error ratio from a set of experimental runs in direct-detection orthogonal frequency division multiplexing optical communication systems is proposed. The approach provides fast and accurate bit error ratio estimates avoiding the high amount of data required by direct error counting. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2772,2775, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25595 [source]

    All-optical clock division with simultaneous wavelength conversion using an optically injected Fabry-Perot laser diode

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 10 2009
    Yu-Xiang Lv
    Abstract The authors propose and experimentally demonstrate a novel technique that uses a single Fabry-Perot laser diode (FP-LD) to perform simultaneous all-optical clock division and wavelength conversion. By utilizing the nonlinear dynamical period-one oscillation and the cross-gain modulation effect of the light injection semiconductor laser, we achieve the all optical clock frequency division of 12.36 GHz to 6.18 GHz with simultaneous wavelength conversion from 1550.24 nm to 1545.91 nm. The phase noise of the extracted optical clock is less than ,105 dBc/Hz. It was empirically found that the best clock division and wavelength conversion occurred when the injected signal power was approximately 2,2.5 times as the injected probe light power, and the range of optimum wavelength detuning was about from ,0.01 nm to 0.06 nm. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2428,2431, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24626 [source]

    Analysis of frequency division in microstrip circuits by using the FDTD method

    MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 5 2008
    Oscar González
    Abstract The accurate time-domain simulation of the nonlinear dynamics of circuits containing distributed elements is of great interest. Specially at high frequencies, it is essential to consider phenomena, such as crosstalk, packaging effects, and electromagnetic interaction between active and passive elements. These effects are mainly due to the distribute components of the circuit. Therefore, the accuracy in the instability or oscillation analysis of nonlinear circuits is often limited by the models used for such elements. Commercial simulators based on the equivalent-circuit approach hardly take into account the mentioned effects. In this work, the finite-difference time-domain (FDTD) method is applied to the nonlinear simulation of a diode-based microstrip circuit exhibiting a parametric frequency division by two. The FDTD method rigorously solves Maxwell's curl equations in the time domain providing a full-wave characterization of the distributed elements of the circuit. In the example considered, a relatively low operating frequency has been selected to allow a reliable comparison between the results obtained by the proposed technique and those provided by a circuit-based commercial simulator. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1300,1302, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23352 [source]