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Author: search.filters.author.Kamuang, Settakorn

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    MRC-MMSE detection in DF-cooperative communications with Rate 2/4 trellis coding
    (2010-07-30)
    Kamuang, Settakorn
    ;
    Sittichivapak, Suvepon
    This paper proposes the MRC-MMSE (Maximal Ratio Combining - Minimum Mean Squared Error) detection of the space time coding over Decode and Forward (DF) cooperative network channel with 16 states binary Rate 2/4 convolutional code. As we employed this convolutional code rate and Alamouti space time scheme, the transmitted signal can be created by two QPSK modulators instead of 16 - PSK or 16-QAM technique. When relay node has detection error, the system is biased. MRC-MMSE detection can reduce this effect. Numerical results show that the proposed technique significantly reduces error rate performance. Additionally, this technique does not require any bandwidth expansion.
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    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.
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    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.