Wongrujira, Krit

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Wongrujira, Krit
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krit.wo@kmitl.ac.th

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    Item type:Publication,
    New spread spectrum technique by using orthogonal carrier frequencies
    (2000-12-01)
    Kamuang, Settakorn
    ;
    Khawne, Amnach
    ;
    Wongrujira, Krit
    ;
    Noppanakeepong, Suthicahi
    This paper proposes multicarrier spread spectrum, which uses few carriers, but provides high processing gain. Normally, multicarrier spread spectrum will apply in multicarrier CDMA system that must use many orthogonal carrier frequencies, which complicate and complex to the system. So, we should apply m-sequence that has high speed for reducing the number of carrier frequency. This paper will show that this system can also be spreading spectrum.
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    Item type:Publication,
    Wavelet transform technique in multimedia CDMA systems
    (2002-12-01)
    Kamuang, Settakorn
    ;
    Chomphuphun, Arnan
    ;
    Wongrujira, Krit
    ;
    Noppanakeepong, Suthichai
    In this paper we propose the multimedia communication on direct sequence CDMA system and implement it by using Wavelet technique. It is an analysis tool for time frequency localization. In this paper we choose Morlet as the mother wavelet yielding Gaussian shape in frequency spectrum. Another advantage of Gaussian shape can reduce the sidelobe powers of the frequency spectrum result in efficient frequency bandwidth. The evaluations of the performance are proposed and compare with the conventional CDMA system.