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Author: search.filters.author.Kaewmechai, SompophSubject: search.filters.subject.Ultra wideband (UWB)

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    Indoor propagation channel measurement of ultra wideband antenna with robotic
    (2005-12-01)
    Boonvisat, Satean
    ;
    Promwong, Sathapom
    ;
    Supanakoon, Pichaya
    ;
    Kaewmechai, Sompoph
    ;
    Sitiyopasakul, Pisan
    In this paper, the characterization of ultra wideband (UWB) antenna with robotic is evaluated. The measurement system consists of transmitter (Tx) and receiver (Rx) biconical antennas measured by using a vector network analyzer (VNA). To obtaining the data, measurements were performed at 3 GHz to 11 GHz covered by a VNA, which provided information on the amplitude and phase of the transmission coefficient. Friis' transmission formula is not directly applicable and the waveform distortion may degrade the transmission performance as well. The matched filter is considered at the receiver side to maximize the SNR for evaluation. The power delay profile and the UWB transmission gain, based on the extension of Friis' transmission formula take into account the transmitted waveform and the matched filter into the system for the free space of UWB. The experimental examples using the biconical antenna as the receiver install with robotic are presented in this paper. © 2005 IEEE.
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    Indoor measurement results of UWB impulse radio for shot-range wireless systems with RMS delay spread and path loss
    (2005-12-01)
    Leechaikitjaroen, Keatichai
    ;
    Promwong, Sathaporn
    ;
    Supanakoon, Pichaya
    ;
    Chensirikul, Somsak
    ;
    Kaewmechai, Sompoph
    In this paper, we describe a simple method for measurement of the ultra-wideband (UWB) frequency response for evaluation of the path loss and RMS delay spread which are the important parameters for the wireless communications, probability and cumulative density of rms delay spread and path loss are evaluated based on the measurement of UWB indoor environment. For the measurement, the frequency responses of the UWB channel are acquired by using a vector network analyzer (VNA) over the frequency bandwidth of 3-11 GHz. The biconical antennas are used for both the transmitter (Tx) and receiver (Rx) antennas. The probability density function and cumulative distribution function of the rms delay spread and path loss are shown. The results are discussed in this paper. © 2005 IEEE.