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Author: search.filters.author.Rankhamrat, Borromwut

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    Ultra wireless transmission waveform measurement with IEEE802.15.3a
    (2013-12-31)
    Promwong, Sathaporn
    ;
    Rankhamrat, Borromwut
    ;
    Thavonsassanavong, Thanin
    ;
    Chaiyapong, Saksit
    Ultra wireless transmission waveform with IEEE802.15.3a or ultra wideband (UWB) band is expected to applied to wireless personal area networks (WPANs) such as the ranging in the home network and the office and broadband multimedia systems. Ultra wideband impulse radio (UWB-IR) transmission waveform is investigated by using extended Friis' transmission formula baseded on measurement data. This paper, we conderation the performance system design on ultra wireless system for WiMedia area networks. The received signal 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 spectrum definition and Federal Communications Commission (FCC) indoor and outdoor limit spectral masks, is used as the transmitted UWB signal. The channels are measured in an indoor environment by using a vector network analyzer (VNA). The UWB transmission gains of received signal and isotropic template receivers are shown and compared in results. © 2013 IEEE.
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    Wireless ultra wideband transmission experiments
    (2011-12-01)
    Rankhamrat, Borromwut
    ;
    Promwong, Sathaporn
    The free space transmission estimation of ultra wideband impulse radio (UWB-IR) was developed by using the extension of Friis' transmission formula [1]. It considered the transmitted waveform and its distortion due to the channel and the transmitter (Tx) and receiver (Rx) antennas for the free space link budget evaluation of UWB-IR. This paper presents the two path evaluation formula of the ground reflection path loss for UWB-IR systems that based on the extension of Friss' transmission formula. Since the antennas are the pulse-shaping filters in UWB-IR systems, the biconical antennas are experimentally examined, especially focusing the effect of template waveforms. © 2011 IEEE.