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Author: search.filters.author.Chamchoy, MonchaiSubject: search.filters.subject.Ultra-wideband

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    A simple method of synthesis design for generating UWB pulse based on wavelet
    (2005-12-01)
    Pongpisut, Tanat
    ;
    Chamchoy, Monchai
    ;
    Promwong, Sathaporn
    This paper proposes the simple method of synthesis design for generating UWB pulse based on wavelet. This study consider the characteristics of Haar wavelet, which are digital and simple method for synthesizing. By using discrete wavelet transform, the synthesis signal is similar with mother signal and simple to implement. In our study, the modulated Gaussian waveform is involved as the UWB pulse for synthesizing. The synthesis signal method based on Haar wavelet which is the mother wavelet is presented. Moreover, the comparison for the performance between the mother signal and the synthesis signal on the additive white Gaussian noise (AWGN) channel are given. © 2005 IEEE.
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    Ground reflection model in rough surface forUWB impulse radio
    (2005-12-01)
    Vongsripeng, Porntape
    ;
    Promwong, Sathaporn
    ;
    Supanakoon, Pichaya
    ;
    Chamchoy, Monchai
    ;
    Keawmechai, Sompoph
    Ultra-wideband (UWB) is currently wide interesting technology of wireless communication technology in building and home entertainment. In order to be the most effective wireless communications, we have to consider the parameters which are vital signal transmission factors of UWB. As a consequent, imitation of UWB signal transmission in two-part model so as to notice reflected signal from several rough types of ground such as Brick and Limestone is demonstrated in this abstracts. Friis' transmission formula and Rayleigh equation are used to calculate in this model for searching any effects happened by reflection of rough ground and analyzed in path loss, path gain and time dispersion as RMS delay spread. © 2005 IEEE.
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    Empirically based path loss and penetration loss models for UWB communication in residential environment
    (2005-12-01)
    Chamchoy, Monchai
    ;
    Jaturatussanai, Pongsatorn
    ;
    Promwong, Sathaporn
    This paper contains measured data and empirical models for 3.1-10.6-GHz radio propagation path loss and aggregate penetration loss (APL) in residential areas for UWB applications. A frequency domain based experiment is performed for line-of-sight (LOS) and obstruction propagation conditions. The double ridge horn antenna and the biconical antenna are used to investigate the dependence of the antenna directivity on the UWB path loss. While the penetration loss is modeled under the directional propagation scheme. The characterization of the path loss exponent, n, and the APL are investigated. Therefore, the propagation prediction models are developed to understand the phenomenon of the futuristic indoor residential communication systems for home wireless networking. © 2005 IEEE.