Supanakoon, Pichaya
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Supanakoon, Pichaya
Alternative Name
Supanakoon, P.
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pichaya.su@kmitl.ac.th
33 results
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Item type:Publication, Comparison of UWB fingerprinting with vertical and horizontal polarizations for indoor localization(2010-07-30); The indoor localization system has been extensively researched because of its various applications. This system requires high accuracy in indoor environments which absence line of sight and dense multipath. Ultra wideband (UWB) fingerprinting is developed for this purpose. This paper discuss about indoor localization using a fingerprinting concept based on UWB signal and compares between vertical and horizontal polarization cases. All of the measurements used biconical antennas as both transmitter (Tx) and receiver (Rx) antennas. The channel frequency transfer functions of corridor environment were measured at frequencies ranging from 3 GHz to 11 GHz. The path loss and delay time of first three-path is investigated to perform the fingerprints and signatures. The accuracy of estimated distances is shown in terms of cumulative distribution function (CDF). From the results, horizontal polarization provides greater accuracy than vertical polarization. - Some of the metrics are blocked by yourconsent settings
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, Accuracy Analysis of Indoor Positioning Using Min-Max Method(2025-01-01); ; In this paper, the accuracy analysis of indoor positioning using min-max method is proposed. The distance error model is applied to estimate the distance between the transmitter and user's position with different path loss exponent and fading amount of indoor channel. The total $\mathbf{1 0 0}$ coordinates of user's positions are estimated using min-max method. The distance error at each position, probability density function (PDF) and cumulative distribution function (CDF) of distance errors are illustrated. The mean of analysis distance error corresponds with the mean of measurement distance error with same path loss exponent and fading amount of indoor channel. The results show that it is possible to use this accuracy analysis to estimate the distance error in an indoor environment. - 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, Measurement and evaluation of radar cross section for furniture in an indoor propagation channel(2014-11-11); ; Takada, J.This paper has attempted to evaluate the radar cross section (RCS) of two furniture items in an indoor environment in a frequency range of 3-7 GHz of the ultra-wideband (UWB) range. The RCS evaluation is achieved through an extended version of the radar equation that incorporates the channel transfer function of scattering. The time-gating method was applied to remove the multipath effect, a phenomenon which typically occurs in the indoor environment. Two double-ridged waveguide horn antennas for both vertical and horizontal polarizations were used to obtain the transfer function of scattering of the furniture prior to analysis in order to derive their bistatic RCS. The RCS results validate the applicability of the proposed extended radar equation to the indoor propagation prediction. - 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, Quantitative Measurement of Path Loss Model Adaptation Using the Least Squares Method in an Urban DVB-T2 System(2018-01-01); ; The aim of this paper was to propose quantitative measurement of path loss model adaptation in urban radio propagation for a second-generation, terrestrial digital video broadcasting standard (DVB-T2) system. The measurement data was analyzed using data processing based on the least squares (LS) method to verify the probabilistic quantitation of realistic data measurement such as mean error (ME), root mean square error (RMSE), and standard deviation of error (SD), as well as relative error (RE). To distinguish the experimental evaluation, the researchers compared between the conventional Hata path loss model and the proposed model. The result showed that path loss based on the proposed model was more accurate in predicting the quantitative measurement of propagation data properly.