Promwong, Sathaporn
Loading...
Preferred name
Promwong, Sathaporn
Alternative Name
Promwong, S.
Promwong, Sathapom
Promwong, Sathapotn
Promwong, Sathapron
Main Affiliation
Email
sathaporn.pr@kmitl.ac.th
168 results
Now showing 1 - 10 of 168
- Some of the metrics are blocked by yourconsent settings
Item type:Publication, Indoor positioning based on IEEE 802.15.4a standard using trilateration technique and UWB signal(2012-11-12) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Performance evaluation of UWB communications with optimum receivers(2015-01-26); Southisombath, PhouthongThe performance of ultra wideband (UWB) communications are very important for short range wireless communication to consider with matched filter and correlation receivers are evaluated. The rectangular passband, modulated rectangular and modulated Gaussian waveforms, which is satisfied the UWB signal definition and Federal Communications Commission (FCC) indoor and outdoor limit spectral masks, are used as the transmitted UWB signal. The complex form of Friis' transmission formula is considered as the UWB free space channel. Therefore, the distortion effects caused from the channel are included. The BER performance of each waveform is shown and compared. The results are discussed in the conclusion. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Experimental study for polarimetric measurement of RFID transfer function with in an indoor environment(2009-12-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Characterization of Wireless Power Transfer Measurement at 2.45 GHz(2018-07-02); Wireless sensor network has been developing rapidly. Internet of Things (IoT) is a major role for the next generation of wireless communication system. However, the power consumption and lifetime of the battery are a limitation for the IoT device. Wireless Power Transfer (WPT) is a promising technology to solve the problem due to it can be the ubiquitous power source for the IoT devices by provide the energy via the propagation of radiowaves. The 2.45 GHz ISM is a popular frequency bandwidth which widely used in WiFi application which make it easy to use. The performance of the propagation can evaluate by various parameter. Receive power is use to analyze the efficiency of the radio frequency transmission. Therefore, this paper has been evaluated the WPT measurement data with difference separate distance between antennas at 2.45 GHz. By using the meander line antenna as the transmit antenna and receive antenna. Vector network analyzer (VNA) is used to measure and record the transfer function. The receive power which analyze the measurement data by using link budget equation. The results have shown good agreement between the simulation and measurement result which have the average of measurement result less than the simulation result around 2 dB. - Some of the metrics are blocked by yourconsent settings
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, UWB Transmission Waveform Application for in an Indoor Localization System(2024-01-01); Nowadays, the indoor localization systems had been widely utilized. The popular use of localization system is the global position system (GPS). However, the system fails in particular environments such as indoors because low received signal power. It is not appropriate to take a position. The indoor localization system was used to assist in finding a position in an indoor environment. There are several techniques used to evaluate. Technique trilateration model is a technique of geometric. This technique leverages circular intersections to estimate target positions. The circles are derived from a set of reference positions. This paper studies on indoor positioning in line of sight (LOS) using by IEEE 802.15.4 standard in ultra wideband option which this study employs trilateration to estimate the position of target objects. Biconical antennas with vertical polarization serve as both transmitting and receiving elements. The evaluation is conducted using a vector network analyzer (VNA) across a frequency range of 3GHz to 11GHz. The positioning accuracy will be assessed in terms of distance error. - 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, Void Handling by Utilizing Location-Based Assistance Through Trajectory Mapping(2023-01-01) - 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.