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Author: search.filters.author.Nilsuwan, Phichet

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    Performance evaluation of D3LS and NCLS smart antenna in mobile communications
    (2012-12-01)
    Boonpoonga, Akkarat
    ;
    Nilsuwan, Phichet
    ;
    Tagapanij, Jukkrit
    ;
    Sirisuk, Phaophak
    A smart antenna was proposed to improve wireless communication systems. The smart antenna may comprises direction-of-arrival (DOA) estimation and/or adaptive antenna. The DOA estimation technique is used to estimate direction of transmitted signals. An adaptive antenna has ability of suppressing undesired signals namely interference or jammers in specific directions while receive only the desired one. There are a number of methods proposed to conduct in such way, including multiple signal classification (MUSIC), least mean squares (LMS), sample matrix inversion (SMI), recursive least squares (RLS), and their derivative forms as seen in the literatures in [1]. These methods require a training sequence or known information for adaptation and/or DOA estimation. Although a constant modulus algorithm (CMA) was proposed without the need of training sequence, it has a slow convergence. © 2012 IEICE.
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    Smart antenna using a combination of D3LS and NCLS algorithms
    (2012-10-02)
    Nilsuwan, Phichet
    ;
    Boonpoonga, Akkarat
    ;
    Tagapanij, Jukkrit
    ;
    Sirisuk, Phaophak
    This paper presents a smart antenna system using a combination of nonconventional least square (NCLS) optimization and direct data domain least square (D3LS) for direction-of-arrival (DOA) estimation and beamforming, respectively. In the proposed system, NCLS optimization is utilized to estimate DOA of incoming signal first. The estimated DOA is then assisted for initial processing of D3LS in beamforming. The performance in term of estimated signal amplitude and estimated DOA of the proposed system is evaluated via simulations. © 2012 IEEE.