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Author: search.filters.author.Sirisuk, PhaophakSubject: search.filters.subject.CMA

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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.
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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.