Supanakoon, Pichaya
Loading...
Preferred name
Supanakoon, Pichaya
Alternative Name
Supanakoon, P.
Main Affiliation
Email
pichaya.su@kmitl.ac.th
18 results
Now showing 1 - 10 of 18
- 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, 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, Performance evaluation scheme of SNR gain for UWB impule radio receivers(2007-12-01); In this paper, we evaluated the signal to noise ratio (SNR) gains of ultra wideband (UWB) for UWB receivers performance. The optimum and isotropic matched filter receivers are considered. The biconical antennas are used as the transmitter (Tx) and 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 SNR gains of optimal and isotropic matched filter receivers are shown and compared in results. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Indoor measurement results of UWB impulse radio for shot-range wireless systems with RMS delay spread and path loss(2005-12-01); ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Experimental evaluation scheme of UWB radio propagation channel with human body(2005-12-01); ; This paper presents the evaluation scheme to investigate the pulse distortion, propagation loss due to human body shadowing. The matched filter is employed at the UWB receiver to maximize the SNR. The propagation loss and matched filter gain of the passband rectangular pulse are simulated for comparing with the experiment results. The experimental channels are taken for several T-R separation distances in an indoor environment. The frequency responses of the radio channels are acquired by using a vector network analyzer (VNA) over the frequency bandwidth of 3 GHz to 11 GHz. From the results, the distortion and the propagation loss of the UWB pulse increase as the T-R separation distance increases, especially when the fully shadowing is occurred. © 2005 IEEE. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Accuracy improvement of focusing resolution for ultra wideband imaging systems(2007-12-01); ; Sukutamtanti, NikornThe focusing resolution is very important performance for ultra wideband (UWB) imaging systems. In this paper, the accuracy of focusing resolution is improved for UWB imaging systems. The time-reversal (TR) electromagnetic (EM) pulse propagation is done via the numerical simulation of finite difference time domain (FDTD) method. The modulated Gaussian pulse is used as the UWB EM pulse. The accuracy is improved by increasing the elements of TR array (TRA). The directional error of each case is shown and investigated. From the results, we clearly see that the increasing of TRA elements can be improved the accuracy of focusing resolution. ©2007 IEEE.