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Author: search.filters.author.Tantisopharak, TanawutSubject: search.filters.subject.Adaptive antenna

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    Adaptive array antenna using on-off and CMA algorithms for microwave RFID readers
    (2011-01-01)
    Tantisopharak, Tanawut
    ;
    Boonpoonga, Akkarat
    ;
    Phongcharoenpanich, Chuwong
    ;
    Sirisuk, Phaophak
    ;
    Krairiksh, Monai
    This paper proposes an adaptive antenna using a combination of on-off and CMA algorithms. With the proposed technique, the on-off algorithm is first employed to search for a desired signal direction in which maximum received power is achieved. Then, interference is suppressed by performing CMA. Simulations are conducted according to the potential application of the proposed adaptive antenna. The simulation results show the SINR improvement implying that the proposed adaptive antenna can be applied to microwave RFID systems in order to resolve reader collision. Furthermore, the proposed adaptive antenna is implemented and then experimented. The experimental results verify that the proposed adaptive antenna can reduce interference resulting in the collision problem. Copyright © 2011 The Institute of Electronics, Information and Communication Engineers.
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    Simple initialization scheme for CMA adaptive antenna by using digital beam synthesis
    (2008-10-06)
    Tantisopharak, Tanawut
    ;
    Boonpoonga, Akkarat
    ;
    Sirisuk, Phaophak
    ;
    Krairiksh, Monai
    This paper presents a simple technique of initialization for CMA adaptive antenna. The technique utilizes digital beam synthesis for a circular array antenna to synthesize the beams in digital domain. The synthesized beam can be switched into different directions by choosing proper weight vectors. The weight vectors are calculated through a phased array principle. The beams obtained from the synthesis are employed to initial CMA in order to improve its convergence property. The technique makes the compact adaptive antenna using CMA possible. Simulation results show that the proposed technique can significantly improve the convergence property of CMA. ©2008 IEEE.