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Author: search.filters.author.Phongcharoenpanich, ChuwongSubject: 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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    Performance of switched-beam element phased array for handset adaptive antenna
    (2007-12-01)
    Boonpoonga, Akkarat
    ;
    Sirisuk, Phaophak
    ;
    Phongcharoenpanich, Chuwong
    ;
    Krairiksh, Monai
    This paper evaluates the performance of a handset adaptive antenna using a constant modulus algorithm (CMA). The antenna is a switched-beam phased array antenna which can assist initialization of CMA. The method to improve convergence property of CMA exploits a beam with maximum received power from several switched-beams of the antenna as an initial beam. Simulation results in term of signal-to-interference plus noise ratio (SINR) are shown to validate that the proposed antenna has a good performance and is suitable for installation on a handset. © 2007 EuMA.
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    Beam-switching-assisted CMA initialization for handset adaptive antenna
    (2007-08-28)
    Boonpoonga, Akkarat
    ;
    Sirisuk, Phaophak
    ;
    Phongcharoenpanich, Chuwong
    ;
    Krairiksh, Monai
    This paper presents two initialization schemes: phased array-assisted initialization and switched-beam element phased array-assisted initialization, for a constant modulus algorithm (CMA). Both techniques utilize a beam with maximum received power obtained by beam-switching of array antenna to initial CMA. The techniques can significantly improve convergence properties of CMA, which is employed for weight adjustment of an adaptive antenna system. The architecture of the proposed adaptive antenna system is illustrated to show the low-cost assistance for CMA initialization. Finally, simulation results are shown to evaluate SINR performance of the proposed techniques. ©2007 IEEE.