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Author: search.filters.author.Sereewattanapong, ThawatchaiSubject: search.filters.subject.Friis' transmission formula

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    Performance evaluation scheme of ultra wideband impulse radio transmission
    (2010-07-30)
    Sereewattanapong, Thawatchai
    ;
    Promwong, Sathaporn
    Ultra wideband transmission waveform is investigated by using extended Friis' transmission formula baseded on experiment data. This paper, we consideration the performance system design on ultra wideband impulse radio (UWB-IR) system for personal 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 signal 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 anechoic chamber by using a vector network analyzer (VNA). The relative gains of received signal and isotropic template receivers are shown and compared in results.
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    Evaluation of ultra wideband impulse radio transmission loss due to laptop computer
    (2009-12-01)
    Sereewattanapong, Thawatchai
    ;
    Promwong, Sathapom
    This paper presents the evaluation of the transmission gain of an ultra wideband antenna on a labtop computer based on the extended Friis' transmission formula. The matched filter is considered at the receiver side to maximize the SNR for evaluation. This technique gives very accurate results and is very useful for the design and evaluation of UWB impulse radio transmission systems, especially for the evaluation of waveform distortion effects. ©2009 IEEE.