Promwong, Sathaporn

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Promwong, Sathaporn
Alternative Name
Promwong, S.
Promwong, Sathapom
Promwong, Sathapotn
Promwong, Sathapron
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Email
sathaporn.pr@kmitl.ac.th

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    Experimental evaluation scheme of ultra-wideband human body transmission model for wireless body area network
    (2018-01-01)
    Chaisang, Aditep
    ;
    Promwong, Sathaporn
    The body area network (BAN) working on IEEE 802.15.6 is a wireless short-range communication system that is smaller in coverage than the personal area network (PAN) IEEE802.15.3a. A wireless body area network (WBAN) is a wireless technology with a human body that is becoming a key part of short-range radio wave systems and wireless medical technology. The transfer function characteristics of the human body and the transmission loss due to the human body should be studied. Short-range radio wave applications with a human body are more complicated than additional uses. Therefore, realizing the distribution channel characteristics of the human body with ultra-wideband (UWB) technology is important. UWB technology has a very large bandwidth, low power, and low cost, which can be used in shortrange systems. In this paper, we present the characterization measurement data of the UWBHB channel transfer function based on the human body effect with and without human body in WBAN system. In this study, we maximize the signal-to-noise ratio (SNR) and contemplate the matched filter at the receiver. The outcomes are analyzed and evaluated on the basis of Friis' formula. The proposed method achieves very precise results and is convenient for the evaluation and design of the waveform of WBAN transmission in wireless medical applications and BAN systems, mainly focusing on the input waveform effect.
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    Identification of pure and impure palmyrah palm juice by using microwave sensor system
    (2015-10-01)
    Kanahna, Rachen
    ;
    Keowsawat, Panisa
    ;
    Promwong, Sathaporn
    ;
    Phongcharoenpanich, Chuwong
    The objective of this research was to construct a microwave sensor system for identifying the pure and impure palmyrah palm juice. The microwave sensor system consisted of the signal generator, the detector circuit and the processing unit. The system measured the transmission signal between a pair of antennas at the frequency of 2.45 GHz. The transmission signal sending through the pure palmyrah palm juice and the impure juice that was added the granulated and coconut sugar was measured. The results showed the difference of transmission signal magnitude with the different kinds of juice and total soluble solid (TSS). The results that were measured by the proposed microwave sensor system get along well with the results from the network analyzer. Then, this proposed system can be used to distinguish the pure and impure juice.
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    Measurement and evaluation of radar cross section for furniture in an indoor propagation channel
    (2014-11-11)
    Maw, M. M.
    ;
    Supanakoon, P.
    ;
    Promwong, S.
    ;
    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.
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    Investigated performance of Davidson model for DVB-T2 propagation in medium and small urban area
    (2017-01-01)
    Keawbunsong, Pitak
    ;
    Supannakoon, Pitchaya
    ;
    Promwong, Sathaporn
    This study investigates the efficiency of Davidson Path Loss Model in order to apply for use in the DVB-T2 propagation network design for medium and small urban areas in southern Thailand. The data being collected from the electric field strength while broadcasting of two channels within urban areas of Hadyai, Songkla Province are used for the path loss analysis. The result through a comparison on the efficiency of an old Davidson Model and a calibrated Root Mean Square Error (RMSE) model along with an efficiency index of Relative Error (RE) shows that the old Davidson Model is closer to the measured data than the calibrated ones. The statistics also demonstrates that the RE of the old Davidson Model is at the least when being compared with the RE of both the calibrated and the Hata Models. The old Davidson Model is therefore, the most accurate and the most optimized for the design of the propagation network.
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    Characteristic of ultra wideband body area network channel
    (2015-10-01)
    Teawchim, Sanit
    ;
    Promwong, Sathaporn
    This paper presents characteristic of ultra wideband body area network (UWB-BAN) channel. The passband rectangular waveform and passband root raised cosine (RRC) waveform are provided to transmit signal. In this paper, an investigation channel measured by using a network analyzer and performed a frequency ranged with 3 GHz–5 GHz. The meander line miniature antennas were taken to obtain as a transmitter and receiver antenna side, repectively. The 12 sample bodies with 10 positions of each body were considered. The linear regression model of large-scale path loss and cumulative distribution function (PDF) of multipath fading factor based on average and peak power loss are shown. Measurement data are useful to predict the performance of UWB-BAN system.
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    Quantitative Experimental Evaluation of RFID Propagation Loss with Wooden and Metal Bookshelves
    (2023-01-01)
    Supramongkonset, Jatuporn
    ;
    Promwong, Sathaporn
    Radio frequency identification (RFID) is wireless multimedia applications for bookshelves experimental system to replace the barcodes media technology. The RFID propagation channel characteristics and environment effect should be known. In this study to evaluate the RFID propagation loss with wooden and metal bookshelves based on data of measurement. Experimental study evaluation of RFID multimedia system with bookshelves is using vector network analyzer (VNA) and the microstrip patch antennas of transmitter (Tx) and receiver (Rx) antennas at a frequency range from 2.4 GHz to 2.5 GHz. The results of experiment are considering the path loss, received signal strength (RSS), and comparison the path loss differences with cumulative distribution function (CDF) to evaluated, respectively. In this research work are necessary for RFID antenna design and evaluate the RFID multimedia systems.
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    Optimized Walficsh-Bertoni model for path loss prediction DTTV propagation in urban area of Southern Thailand
    (2015-10-01)
    Keawbunsong, Pitak
    ;
    Supannakoon, Pitchaya
    ;
    Promwong, Sathaporn
    This article presents the optimization of a Walficsh-Bertoni path loss model to be used in designing the DTTV propagation in an urban area of southern Thailand through the data collection on the signal power that the network operators of 4 channels broadcasting within the distance of 2.5–6.5 Km. in urban Hat Yai, Songkla Province, an area of high density with buildings. A least square method is used for the optimization while an efficient indicator is through statistical values of root mean square error (RMSE) and relative error (RE). The result is a new Walficsh-Bertoni model that has RMSE value lesser than the original model whereas the RE value is also closer to zero than the original models. Subsequently, the Walficsh-Bertoni model is more precise in a prediction, making it optimized for use in planning the network.
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    Quantitative Measurement of Path Loss Model Adaptation Using the Least Squares Method in an Urban DVB-T2 System
    (2018-01-01)
    Keawbunsong, Pitak
    ;
    Duangsuwan, Sarun
    ;
    Supanakoon, Pichaya
    ;
    Promwong, Sathaporn
    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.
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    Optimum path loss model calibration for prediction DTTV propagation in urban area of southern Thailand
    (2015-12-01)
    Keawbunsong, Pitak
    ;
    Promwong, Sathaporn
    This article offers an optimum path loss model calibration for the prediction of DTTV propagation in an urban area of southern Thailand by selecting the urban area of Hat Yai, Songkla Province where there is density of high rises and buildings as a data collecting place. The data are collected from the measurement of the network operators’ transmitted signal levels among four channels: CH26 with the frequency of 514 MHz; CH42 with the frequency of 642 MHz; CH46 with the frequency of 674 MHz and CH54 with the frequency of 738 MHz, whereas the distance from the transmitted station ranges between 2.5 and 6.5 km. The calibration is conducted through a method of mean error (ME) and root mean square error (RMSE) from the value of the received signal and the calibrated model’s efficient indicator is through the value of relative error (RE). The analytical results of ME and RMSE show that the new Hata Path Loss Model is optimal for the calibration as its RE value is not only closer to zero but also closer to the measured data than the original model or other compared models. The path loss calibration with ME value is more accurate and more suitable for the work of the network design than the ones using RMSE value.
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    Empirical Path Loss Channel Characterization Based on Air-to-Air Ground Reflection Channel Modeling for UAV-Enabled Wireless Communications
    (2021-01-01)
    Supramongkonset, Jatuporn
    ;
    Duangsuwan, Sarun
    ;
    Maw, Myo Myint
    ;
    Promwong, Sathaporn
    The purpose of this work was to investigate the air-to-air channel model (A2A-CM) for unmanned aerial vehicle- (UAV-) enabled wireless communications. Specifically, a low-altitude small UAV needs to characterize the propagation mechanisms from ground reflection. In this paper, the empirical path loss channel characterizations of A2A ground reflection CM based on different scenarios were presented by comparing the wireless communication modules for UAVs. Two types of wireless communication modules both WiFi 2.4 GHz and LoRa 868 MHz frequency were deployed to study the path loss channel characterization between Tx-UAV and Rx-UAV. To investigate the path loss, three types of experimental channel models, such as CM1 grass floor, CM2 soil floor, and CM3 rubber floor, were considered under the ground reflection condition. The analytical A2A Two-Ray (A2AT-R) model and the modified Log-Distance model were simulated to compare the correlation with the measurement data. The measurement results in the CM3 rubber floor scenario showed the impact from the ground reflection at 1 m to 3 m Rx-UAV altitudes both 2.4 GHz and 868 MHz which was converged to the A2AT-R model and related to the modified Log-Distance model above 3 m. It clear that there is no ground reflection effect from the CM1 grass floor and CM2 soil floor. This work showed that the analytical A2AT-R model and the modified Log-Distance model can deploy to model the path loss of A2A-CM by using WiFi and LoRa wireless modules.