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Author: search.filters.author.Udomsom, Sittan

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    Item type:Publication,
    A novel analysis of IR-WPAN transmission using Friis' transmission formula
    (2017-11-03)
    Udomsom, Sittan
    ;
    Yooyativon, Thongchai
    ;
    Chaisricharoe, Roungsan
    ;
    Kamyod, Chayapol
    ;
    Promwong, Sathaporn
    Impulse radio (IR) transmission is consider used in wireless personal area network (WPAN) for high speed and low power transmission and new innovation wireless technology. This paper propose a novel analysis of impulse radio transmission in WPAN for ultra wireless communications. The waveform distortion due to the antennas should be considered. The optimum and isotropic template receivers are considered based on Friis transmission formula. In this experimental study, the biconical antennas are uesd as the transmitter (Tx) and the receiver (Rx) antennas. The rectangular passband, which is satisfied the full band of UWB-IR definition and Federal Communications Commission (FCC) indoor limit spectral masks, is used as the transmitted waveform of UWB system. The channels are measured in an anechoic chamber by using a vector network analyzer (VNA). The measured data are evaluated in path loss of optimal and isotropic template receivers, the IR transmission gains and BER are shown and compared in results.
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    Performance evaluation schame of wideband antennas for ultra-wideband systems
    (2017-04-19)
    Udomsom, Sittan
    ;
    Yooyativong, Thongchai
    ;
    Chaisricharoen, Roungsan
    ;
    Kamyod, Chayapol
    ;
    Promwong, Sathaporn
    The next generation of ultra wideband (UWB) wireless technology requirements is antenna performance. Usually the antenna transfer function evaluate are consider used the model of Friis' formula. In case of UWB wireless communication, its can't used Friis' fomula directly for waveform transmission because of UWB impulse radio technology. In this study, evaluate the antennas effect due to UWB transmission waveform by using modified Friis' formula that takes into account the UWB impulse radio transmission, its waveform distortion due to the anatennas with the antenna transfer function and the correlation template at receiver. The wideband antennas are significant pulse-shaping in UWB transmission, the various kinds of the wideband antennas are experimental evaluation, with consideration on this two type wideband antennas effect by using correlator time with received waveform template and the isotropic waveform template.