Promwong, Sathaporn
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Promwong, Sathaporn
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Promwong, S.
Promwong, Sathapom
Promwong, Sathapotn
Promwong, Sathapron
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sathaporn.pr@kmitl.ac.th
19 results
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Item type:Publication, Simple waveforms satisfying MIC spectral mask for UWB communications(2006-12-01); ; Takada, Jun IchiIn this paper, the simple waveforms for ultra wideband (UWB) communications are presented to satisfy the Ministry of Internal Affairs and Communications (MIC) spectral mask. The rectangular passband, modulated rectangular and modulated Gaussian waveforms are considered. They are optimized to maximized bandwidth, amplitude and average power in the MIC spectral mask bandwidth ranging from 3.4 to 4.8 GHz for low passband and 7.25 to 10.25 GHz for high passband. The maximum average power spectral density (PSD) limit of MIC spectral mask is considered. The binary pulse amplitude modulation (PAM) with balance binary data independent identically distributed (i.i.d.) random sequence is considered to easily derive the PSD of the waveforms. The PSD and parameters of each optimized waveforms are shown. The optimized results are discussed in the conclusion. © 2006 IEEE. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Evaluation of distortion due to the antennas in ultra wideband impulse radio(2007-12-01); Takada, Jun IchiIn free space propagation loss is usually evaluated by using the Friis' transmission formula. However, it is not directly applicable to ultra wideband impulse radio (UWB-IR) transmission systems. This paper presents the link budget evaluation formula for UWB-IR systems that takes into account the transmission signal waveform, its distortion due to the antenna, and the receiver. Since the antennas are significant pulse-shaping filters in UWB-IR, various kinds of antennas are experimentally examined, especially focusing on the effect of template waveform. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, RMS delay spread estimation of ground reflection channel for UWB communications(2005-12-01); Takada, Jun IchiThis paper describes the rms delay spread estimation of ground reflection for UWB communications. This study is based on ground reflection model. The waveform polarizations and ground characteristics are considered. The passband rectangular pulse with specific center frequency and bandwidth is used for transmitted signal. Complex form of Friis' transmission formula is applied for the UWB ground reflection channel. The rms delay spread is evaluated by received signal. The effects of waveform polarizations and ground characteristics on the ground reflection channel are discussed in the paper. © 2005 IEEE. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Path loss and matched filter gain of free space and ground reflection channels for UWB radio systems(2004-12-01); ; Tangtisanon, PrakitIn this paper, the path loss and matched filter gain of free space and ground reflection channels for UWB radio systems are proposed. The passband rectangular pulse with specific center frequency and bandwidth is used as the transmitted signal. The complex form Friis transmission formula is used for the UWB channel. The received signal is evaluated. The UWB path loss is defined as the ratio between the maximum amplitude of the transmitted and received signal waveforms. At the receiver, the matched filter detection with its frequency transfer junction satisfying the constant noise power condition is used. The UWB matched filter gain is defined as the ratio between the maximum amplitude of the signal waveform at the output of the matched filter and that of the received signal waveform. The closed form path loss and matched filter gain expressions are derived. The characteristics of the path loss and matched filter gain are shown and discussed in this paper. © 2004IEEE. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Theoretical ground re. ection model for UWB communication systems(2004-12-01); ; Tangtisanon, PrakitIn this paper, the theoretical ground re. ection model for UWB communication systems is proposed. The pass-band rectangular pulse with speci. c center frequency and bandwidth is used as the transmitted signal. Complex form Friis' transmission formula is applied for the UWB ground re. ection channel. The received signal is evaluated. The UWB path loss is de. ned as the ratio between the maximum amplitude of the transmitted and received signal waveforms. The closed form path loss expression is derived. For the data processing, the path loss and rms delay spread of ground re. ection model are considered for the 1.00, 0.10 and 0.01 m antenna heights. The double linear regression for the path loss is modeled by using the. rst Fresnel zone and MMSE break points. The rms delay spread as the function of the antenna height and the path loss is investigated. The characteristics of the path loss and rms delay spread are discussed in the paper. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Experimental study of UWB transmission antennas for short range wireless systems(2005-12-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Regression models of ultra wideband ground reflection path loss based on peak power loss(2007-12-01); ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Distortion analysis of ultra wideband pulse waveforms with meander line antenna(2006-12-01); ; Takada, Jun IchiIn this paper, the distortion of ultra wideband (UWB) pulse waveforms with meander line antenna (MLA) is analyzed. The rectangular passband, modulated rectangular and modulated Gaussian waveforms, which satisfied the Federal Communications Commission (FCC) definition of UWB signal and FCC spectral masks for the indoor and outdoor limits, are considered. The frequency transfer function of MLA is evaluated by using measurement scheme. The correlation coefficient of each waveform at the specific angle is illustrated. From the results, we can see the distortion effect of each waveform caused by MLA along the specific angle. © 2006 IEEE. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Ground reflection path loss based on average power loss for ultra wideband communications(2007-12-01); ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Performance evaluation of ultra wideband printed antenna by system characterization(2012-10-02); Takada, Jun IchiA lot of Ultra Wideband (UWB) antenna designs, especially printed antenna, have been proposed so far. However, among those proposed designs, only single unit antenna analysis i.e. return loss and radiation pattern at particular frequencies are usually observed. This paper reports a deeper transmission analysis by considering UWB antenna as a system; so called system characterization. For a specific case, a pair of UWB printed monopole antenna with known single unit antenna performance was used for this study. Two-identical-antenna system was measured with Vector Network Analyzer (VNA), then its system transfer function, group delay, and waveform distortion are investigated. The results show that even the single unit antenna performance looks good enough but not so that well when the antenna is considered as a system. Nonlinear transfer function and group delay at some frequency ranges inflicts distortion in the waveform transmission which is crucial for UWB impulse radio scheme. Antenna performance evaluation in this study is provided in the term of its distortion by showing pattern of correlation between the transmitted and the received waveform. © 2012 IEEE.