Supanakoon, Pichaya
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Supanakoon, Pichaya
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Supanakoon, P.
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pichaya.su@kmitl.ac.th
10 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, 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, 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, Waveform distortion and transmission gain on ultra wideband impulse radio(2010-01-01); ; Takada, Jun IchiA waveform of an ultra wideband impulse radio (UWBIR) system can be extremely distorted through a channel even for free-space transmission because of antenna dispersion. This highly degrades the link budget performance. Therefore, the understand of antenna characteristics, which effects on waveform distortion, is necessary. This paper studies the waveform distortion due to antenna in free space transmission in UWB-IR system. The link budget is usually evaluated by using the Friis' transmission formula. However, it is not directly applicable to the UWB-IR transmission system. The link budget evaluation formula attended from conventional Friis' transmission formula that takes into account the transmitted waveform, its distortion due to the antennas, the channel and the correlation receiver is proposed. Since the antenna is significant pulse-shaping filters in UWB-IR system, the example kind of the log-periodic dipole antenna (LPDA) is experimentally examined, especially focused on the effect of the template waveforms. Copyright © 2010 The Institute of Electronics, Information and Communication Engineers. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Three-ray path loss based on peak power loss for ultra wideband impulse radio systems(2011-12-01); ; Takada, Jun IchiPath loss is important parameter to analyze and design link budget. For indoor environment, there is fading that occurs in path loss. Therefore, accurate path loss model, which is considered fading, is necessary. In this paper, three-ray path loss based on peak power loss is proposed for ultra wideband impulse radio (UWB-IR) systems. The rectangular passband is used as UWB-IR transmitted signal. The extension of Friis' transmission formula is applied for UWB-IR three-ray channel. The received signal is evaluated. The closed form formula of three-ray path loss is derived based on peak power loss. The path loss from proposed model was illustrated and compared with three-ray model based on average power loss and free space model. This model can be used to study the characteristic of fading and extended to multi-ray path loss model for indoor environment. © 2011 IEEE. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Path loss expressions of ultra wideband ground reflection channel(2006-12-01); ; Takada, Jun IchiIn this paper, the path loss expressions of ultra wideband (UWB) ground reflection channel are proposed. The expressions are derived from the integral formula in the terms of the closed form formula and double linear regression model based on average power loss. The break point distance are expressed in the exacted formula. The results are compared with other models and verified with the measurement result. The results are discussed in the conclusion. © 2006 IEEE. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Statistical model of RMS delay spread in UWB ground reflection channel based on peak power loss(2006-12-01); ; Takada, Jun IchiWe establish the statistical models of the root mean square (RMS) delay spread for ultra wideband (UWB) communications. The received signal in the UWB ground reflection channel based on peak power loss is evaluated. The RMS delay spread is calculated by using the delayed times and the peak powers of the received signals from the direct and reflected paths. The RMS delay spread with the different signal bandwidths and the antenna heights are demonstrated. The histograms and the probability density functions (PDFs) are illustrated and compared. The parameters of the statistical models are shown. The results are discussed in the conclusion. © 2006 IEEE.