Promwong, Sathaporn

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

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    Path loss and matched filter gain of free space and ground reflection channels for UWB radio systems
    (2004-12-01)
    Promwong, Sathaporn
    ;
    Takada, Jun Ichi
    ;
    Supanakoon, Pichaya
    ;
    Tangtisanon, Prakit
    In 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.
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    Wideband antenna performance evaluation for ultra wideband communication system
    (2018-07-02)
    Ruethorn, Issaree
    ;
    Promwong, Sathaporn
    The transmission loss in modern wireless communication systems is usually evaluate by Friis' formula. However, ultra wideband communication systems cannot apply its directly because the transmission waveform for the ultra wideband is difference from the other wireless communication systems. In this paper, the performance of the ultra wideband antenna with the measurement data of the transmission waveform based on Friis' formula and correlation receiver are presented. This scheme used to evaluate formula for the transmission waveform of the ultra wideband communication system. The distortion will be consider the receiver waveform and antenna should be known. Since the ultra wideband transmission waveform are pulse-shaping by the antenna, difference parameter of the antenna is investigated, especially the effect of the antenna performance and waveform template.
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    Zigbee wireless sensor network localization evaluation schemewith weighted centroid method
    (2018-08-14)
    Thammavong, Lonesy
    ;
    Khongsomboon, Khamphong
    ;
    Tiengthong, Thanadol
    ;
    Promwong, Sathaporn
    Using wireless communication system, appropriate and correct indoor localization with Zigbee sensor network and could provide interesting services and applications. In this study the Zigbee transmission model with positioning method by using the relative-span exponentially weighted centroid method for the indoor localization. The experimental results and analyze results are evaluated a distance error. The ZigBee transmission model in measurement consists of 121 positions with distance between positions to positions is 0.3 meter. The experimental setup at every position operated at frequency band from 2.3 GHz to 2.5 GHz. The accuracy of estimated position is considered in the term of distance error with the cumulative distribution function (CDF) of distance error is shown. The result presents optimal value for REWL is 0.2 and mean of distance error is 0.65 m.
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    Experimental characterization of a UWB channel model for body area networks
    (2011-12-01)
    Arpasin, Dissakan
    ;
    Manositthichai, Narongsak
    ;
    Promwong, Sathaporn
    Wireless technology today are more advancement, especially technique use in communication and communication devices are likely to be closer on the more human. This research is impact of UWB Impulse radio with human body base on measurement data, this type of technology is a high-speed data transmission. To study the impact of the human body that affect the technology UWB, Using a vector network analyzer (VNA) measure and record the result. Finally, Is determined by the parameter such as path loss, power delay profile and study parameters until the model is designed to measure and test it on human body in indoor environment with using the broadband antenna in testing. This research is useful research and basic research for the network to build on the human body with high speed UWB technology in the future. © 2011 IEEE.
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    Evaluation of WUWB Transmission with LOS and NLOS for Smart Home
    (2018-07-02)
    Chamchoy, Monchai
    ;
    Suwan, Supakorn
    ;
    Airphaiboon, Surapan
    ;
    Promwong, Sathaporn
    Wireless ultra-wideband communications technology (WUWB) is a fast popular technology because many unique attractive features that promotes development about wireless communications, networking. WUWB has so high elevated and also allows the force spectral intensity to be so few, and the force limits on UWB are being severely limited by the regulatory bodies. Technology offers plenty advantages, particularly about terms of so high data transmission rates which are good above those probable with currently deployed technologies. The optimization of data transmission is to use multiantenna WUWB method. So, as an alternative, a multiantenna can be used to reduce the error rate as well as improve the quality and capability of wireless transmission by directing, with an aim to adventure the spatial diversity in the channel. The benefits of such a system can be found in independent relationships. This paper presents the spatial effects about transmitter/receiver relations for multiantenna UWB systems under line-of-sight (LOS) and non-line-of-sight (NLOS) situation. A comparison results exhibit that the relations reduce as the antenna length expand for the scenario. In the example of a NLOS situation, the relations does not rely on the spacing.
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    Multipath interference cancellation in multiantenna system with blind channel estimation method
    (2017-01-18)
    Duangsuwan, Sarun
    ;
    Promwong, Sathaporn
    This paper describes on evaluating performance of blind channel estimation methods to cancel the multipath interference from a severity of channel measurement. The proposed methods are considered in an optimal receiver behind the multiantenna system that provides by approaching a zero-forcing (ZF) and minimum mean square error (MMSE) based on the blind signal processing techniques. In this paper, we measured the 4 × 4 MIMO calibration kit with 2.45 GHz sleeve monopole array antennas and employed a vector network analyzer (VNA) to make of channel sounding. The measurement results after data processing is demonstrated by a realistic received signal and we point out how to evaluate the multipath interference with the proposed methods. For the MIMO multiantenna system, we guarantee that the proposed blind channel estimation methods helps to cancel the multipath fading channel and maintains an uncertainty of receiving signals in multiantenna system as perfectly.
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    Accuracy Analysis of Indoor Positioning Using Min-Max Method
    (2025-01-01)
    Supanakoon, Pichaya
    ;
    Vinicchayakul, Wipassorn
    ;
    Tabsombat, Sirinya
    ;
    Tiengthong, Thanadol
    ;
    Promwong, Sathaporn
    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.
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    Investigation of Wireless Body Area Network Localization Based on Measurement Data
    (2022-01-01)
    Promwong, Sathaporn
    ;
    Khongsomboon, Khamphong
    ;
    Chaisang, Aditep
    Short-range wireless communication is important for application use in wireless medical monitoring systems and wireless body area network localizations. Therefore, the channel's characteristics and the human body effect must be studied. This paper will investigate the wireless body area network localization and ZigBee technology based on the IEEE 802.15.4. Moreover, model wireless body area network measurement using a vector network analyzer at the frequency range of 2.2 GHz to 2.6 GHz for measurement and recording. In the experiment result, the wireless body area network localization is analyzed and evaluated by considering the received signal strength and distance error shown in the cumulative distribution function based on the CLEAN algorithm. From experimental studies, this project is beneficial for development studies and essential information for future research studies of wireless body area network localization applications.
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    Experimental study of transmission loss for ultra wideband impulse radio
    (2007-12-01)
    Manositthichai, Narongsak
    ;
    Promwong, Sathaporn
    An ultra wideband impulse radio (UWB-IR) is applied for short-range system such as wireless personal area network (WPAN) in of£ce and home network. The characteristics of transmission signal are very complicated and dif£cult to predict. Therefore, the performances of transmission gain should be considered. In this paper, an experimental study of transmission loss for UWB-IR is presented. We discuss the characteristics of UWB-IR transmission system. The rectangular passband waveform is used as the UWB-IR transmitted waveform. The transfer functions of channels are measured in the convention room using vector network analyzer (VNA). The matched £lter is considered at receiver side to maximize the signal-to-noise ratio (SNR). The optimum received signal, the relative gain and correlation coef£cient are evaluated and shown. ©2007 IEEE.
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    Evaluation of Noise Margin in DVB-T2 System
    (2018-07-02)
    Deepunya, Chairak
    ;
    Suwansukho, Nattapan
    ;
    Promwong, Sathaporn
    This paper describes the Noise Margin of Digital Terrestrial Television network in Thailand. The result of analysis has delivered from 22 measured location, located in 22 district in Bangkok, Thailand.