Chamchoy, Monchai

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Chamchoy, Monchai
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monchai.ch@kmitl.ac.th

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    Item type:Publication,
    Investigation of ultra-wideband pulse distortion due to the body shadowing
    (2005-12-01)
    Pradabphon, Apichit
    ;
    Doungdeun, Worawoot
    ;
    Chamchoy, Monchai
    ;
    Supanakoon, Pichaya
    ;
    Promwong, Sathaporn
    In this paper, the distortion of ultra-wideband (UWB) pulse due to the human body shadowing is investigated. The frequency responses of the radio channels are acquired by using a vector network analyzer (VNA) over the frequency bandwidth of 3 GHz to 11 GHz. The experimental channels are taken for several T-R separation distances in the indoor environment. Consequently, the characteristics of the UWB pulse distortion including the effect of transmitter/receiver antennas and human body are examined. The pulse distortion is considered by using the percentage of the correlation coefficient between the transmitted signal and the received signal. As the results, the distortion of UWB pulse increases as the T-R separation distance increases, especially when the fully shadowing is observed. © 2005 IEEE.
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    Measurement and modeling of UWB path loss for single-band and multi-band propagation channel
    (2005-12-01)
    Chamchoy, Monchai
    ;
    Doungdeun, Worawoot
    ;
    Promwong, Sathaporn
    In this paper, the measured data and the empirical path loss models for 3.1-10.6 GHz ultra-wideband (UWB) radio propagation in the residential environment for single-band and multi-band communication are presented. The path loss characteristics are demonstrated based on the measured channel for line of sight (LOS) propagation by using the double ridge horn antenna and the biconical antenna to investigate the dependence of the antenna directivity on the UWB system. The characterization of the path loss exponent, n, and the reference path loss, PL(d<inf>0</inf>), are provided. In the case of the single-band propagation, as the results, the path loss increases as the T-R separation distance increases as same as the multi-band propagation. For the case of the multi-band channel, however, the path loss exponent can randomly change according to each propagation scheme and subband frequency. Therefore, the propagation path loss models are developed to understand the phenomenon of the indoor residential com-munication systems for home wireless networking. © 2005 IEEE.