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    Please use this identifier to cite or link to this item: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/82998

    Title: Bit Error Rate Reduction for Circular Ultrawideband Antenna by Dynamic Differential Evolution
    Authors: Ho, Min-Hui;Chiu, Chien-Ching;Liao, Shu-Han
    Contributors: 淡江大學電機工程學系
    Keywords: ultrawideband;dynamic differential evolution;bit error rate;feed length;circular antenna array
    Date: 2012-03-01
    Issue Date: 2013-03-13 03:13:34 (UTC+8)
    Publisher: Hoboken: Jossey Bass, Ed. & Pub.
    Abstract: The dynamic differential evolution (DDE) is used to synthesize the radiation pattern of the directional circular arc array to minimize the bit error rate (BER) performance in indoor ultrawideband (UWB) communication system. Using the impulse response of multipath channel, the BER performance of the synthesized antenna pattern on binary pulse amplitude modulation system can be calculated. Based on the topography of the circular antenna array and the BER formula, the array pattern synthesis problem can be reformulated into an optimization problem and solved by the DDE algorithm. The novelties of our approach are not only choosing BER as the object function instead of sidelobe level of the antenna pattern but also considering the antenna feed length effect of each array element. The strong point of the DDE algorithm is that it can find out the solution even if the performance index cannot be formulated by simple equations. Simulation results show that the synthesized antenna array pattern is effective to focus maximum gain to the line of site path which scales as the number of array elements. In other words, the receiver can increase the received signal energy to noise ratio. The synthesized array pattern also can mitigate severe multipath fading in complex propagation environment. As a result, the BER can be reduced substantially in indoor UWB communication system.
    Relation: International Journal of RF and Microwave Computer-Aided Engineering 22(2), pp.260–271
    DOI: 10.1002/mmce.20604
    Appears in Collections:[Graduate Institute & Department of Electrical Engineering] Journal Article

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