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A Study of Improved Indoor Localization Accuracy using Looping Min-Max Technique
(2024-01-01)
Tiengthong, Thanadol
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Mankong, Thanadon
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Suwansukho, Nattapan
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Southisombath, Phouthong
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Chaisang, Aditep
This paper investigates the efficacy of WLAN technology at 5.8 GHz for indoor localization, a widely adopted and versatile approach due to its adaptability and ease of implementation. The choice of 5.8 GHz frequency offers several advantages, including reduced interference and higher data transmission rates, enhancing the precision and reliability of localization systems. Utilizing Received Signal Strength (RSS) for distance calculation is employed due to its computational simplicity and efficiency. The proposed methodology employs a modified Min-Max technique for estimating positions, iterating the Min-Max process until the distance error aligns with a predefined threshold. Comparative evaluation using Cumulative Distribution Function (CDF) demonstrates improved accuracy compared to conventional Min-Max methods. The research findings indicate promising enhancements in accuracy and efficacy for indoor localization using WLAN technology at 5.8 GHz. These advancements hold significant potential for real-time indoor localization applications, paving the way for improved indoor navigation and tracking systems in the future.
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Location Context Awareness System for Specific Positioning Based on Received Signal Strength for Android Platform System
(2023-01-01)
Nonalinsavath, Khamla
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Khieovongphachanh, Vimontha
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Southisombath, Phouthong
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Chaisang, Aditep
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Phomkeona, Sanouphab
In the current era of seamless integration across various contexts, the ability to track mobility both indoors and outdoors has become crucial for many individuals. Tracking the path of mobility from the initial point to the final destination is essential in numerous aspects of human life. This study presents a location-Aware computing application that facilitates the smooth integration of indoor and outdoor environments by combining both requirements within a smart device-based system, without any barriers. The proposed work utilizes the Global Positioning System (GPS) and the Global System for Mobile Communications (GSM) to measure external conditions, while Wi-Fi Fingerprinting (Wi-Fi) is employed to accurately determine the user's indoor locations using received signal strength indicator. The integration of indoor and outdoor technologies ensures seamless user mobility. As users transition between different conditions, the system effectively addresses the complexities that arise between indoor and outdoor locations. The transition time between indoor and outdoor is less than 5 seconds, with seamless switching occurring in the overlapped areas. In our experiments conducted within a campus building, the system achieved a remarkable accuracy of 98.4% for outdoor-To-indoor movement and 97.7% for the reverse movement. Furthermore, the seamless location system offers significant benefits to users, including the discovery of new system features, access to directional maps, and guidance along pathways from their current locations.
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Experimental Study of TETRA Radio for Railway Communication with Leaky Feeder Configuration
(2023-01-01)
Suwansukho, Nattapan
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Chaisang, Aditep
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Tiengthong, Thanadol
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Promwong, Sathaporn
In railway voice communication, the digital radio communication, that are widely used whether along the trackside and in the tunnels especially in urban area. The TETRA standard was selected to be used for fulfill the railway operations requirement. Almost TETRA radio system, the configuration almost carried out with the leaky cable configuration This paper presents the experimental study of TETRA radio system with leaky cable configuration, that being used in the railway communication. The frequency being used are between 385-400 MHz. The result shows the calculated received power compared to the actual received signal with the position of train antenna that closed to the leaky cable, the distance is approx. 3 meters.
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Partial Discharge Localization Model in Power Transformer with Fingerprinting Technique
(2023-01-01)
Chaisang, Aditep
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Tiengthong, Thanadol
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Maw, Myo Myint
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Promwong, Sathaporn
Partial discharge localization in power transformers is of utmost importance, requiring an effective evaluation method to identify the location of such events precisely. Antenna placement poses challenges within power transformers, as improper positioning can significantly affect localization precision. This paper introduces an evaluation of the fingerprinting method for ultra-high frequency partial discharge localization. The fingerprinting method, commonly employed in wireless localization systems, is utilized to assess the accuracy of partial discharge localization. The proposed method leverages fingerprinting analysis and received signal strength to evaluate partial discharge events in power transformers. Experimental partial discharge measurements are conducted on a power transformer model provided by Tesla Power Company. The results include the average received signal strength at each measurement position and the distance error of the partial discharge location determined using the fingerprinting method. This research contributes to assessing partial discharge in power transformers, offering valuable insights for enhancing their health and performance evaluation.
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Experimental Evaluation of UWB-HB Transfer Function with LOS and NLOS for WBAN
(2022-01-01)
Promwong, Sathaporn
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Tiengthong, Thanadol
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Chaisang, Aditep
Short-range wireless communication with low power and high data rate is a key to the future development of wireless body area network systems. Ultra-wideband technology can achieve the primary wireless communication requirements around the human vicinity. Hence, understanding the human body's effect on wireless communication systems is very important to investigate. This paper will present the evaluation scheme for the ultra-wideband human body channel characteristics in an indoor environment. The experimental is divided into two different scenarios, i.e., line-of-sight and non-line-of-sight, based on the actual wireless body area network applications. The experimental parameters cover the full band of the ultra-wideband regarding the FCC regulation of the ultra-wideband technology. The vector network analyzer and antennas are included in the experiment to measure and record the data. The channel transfer function evaluation results are path loss and delay characteristics. The contributions are useful for further development in the future wireless body area network applications as the basic knowledge of the human body effects.
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Investigation of Wireless Body Area Network Localization Based on Measurement Data
(2022-01-01)
Promwong, Sathaporn
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Khongsomboon, Khamphong
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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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The occurrence of passive intermodulation and troubleshooting in Thailand mobile industry
(2020-07-01)
Chaisang, Aditep
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Anantapreecha, Sinchai
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Promwong, Sathaporn
This topic report about Passive Intermodulation(PIM) that can occurred in mobile indoor networks. We findout and troubleshoot this phenomenon by PIm tester. We reduced or adjusted PIM to acceptable level of IEC 62037 standard. This paper first describe the basic principle that PIM can generated and the mathematics backgrounds. PIM is occurred from nonlinear characteristics of all junctions in the networks. When we send two or more modulated signals in the same nonlinear network, PIM occurred and reduced signal quality.
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Experimental evaluation scheme of DTTV propagation loss in Thailand
(2019-07-01)
Promwong, Sathaporn
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Tiengthong, Thanadol
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Chaisang, Aditep
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Rangsanseri, Yuttapong
Digital terrestrial television (DTTV) propagation loss should be known characteristics of DTTV propagation channels. In Thailand used DVB-T2 standard for broadcast television channel which shell be study. DTTV propagation loss based in measurement data with system design and analysis of DTTV parameters are importance. In order to predict the result of the broadcast of DVB-T2 in Pathumthani, Thailand, the Hata propagation model is used as the calibration and optimization method for the measurement results. The measurement of the DVB-T2 signal which broadcast from transmitted station are collect as the source of research data. Two broadcast channels were sampling as the broadcasting frequency in this research, i.e., 626 MHz (CH40) and 658 MHz (CH44). The separated distance between transmitted station and received antenna were in range of 2 km. to 7 km. The least square method is use as the optimized propagation model of DVB-T2 signal. The mean error and root mean square error are use as the statistical value for the calibrated model, while relative error is use to indicate the comparison of model component. In the DTTV propagation channel analysis, the root means square error and the optimized method of calibrated model has relative error higher than the calibrated model with mean error. From the results, it shows that the calibrated model of Hata propagation model with mean error is suitable for predict DTTV propagation loss in urban area of Thailand.
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Body area network transfer function measurement with frequency band from 3 GHz to 9 GHz
(2019-04-15)
Chaisang, Aditep
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Promwong, Sathaporn
Wireless technology for body area network (BAN) is significant interesting in the modern development of short range wireless communication network. Impulse characterization of ultra-wideband is important parameter that used to study in order to understand a signal propagation of BAN channel. Since the complexity of wireless human body applications are higher than another application. Anyway, it is important to understand the channel distribution characteristics due to human body effect. In this research report, transfer function of BAN channel at frequency 3-9 GHz have been presented as the characteristics of waveform transmission in case of with and without human body for apply to the development of short range wireless applications based on the measurement data of this report. To obtain the maximum value of signal to noise ratio (SNR), the matched filter was used as the optimum receiver for better signal quality and well evaluation of BAN system. The transmission equation of Friis was introduce to evaluate the measurement results in this report. The proposed method provides a higher precision and useful for the analysis and design of BAN channel to apply with the system of wireless medical system which focusing on the distortion of transmission signal.
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DVB-T2 Transmission Model in Bangkok Thailand with 626 MHz for DTT
(2018-08-21)
Chaisang, Aditep
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Promwong, Sathaporn
Digital television terrestrial (DTT) of Thailand used digital video broadcasting terrestrial 2nd generation (DVB-T2). The DVB-T2 transmission loss should be knowing and study. However the DVB-T2 propagation channels performance is very importance for Thailand. This paper evaluation of DVB-T2 propagation channel base on measurement data. In the experimental study of DVB-T2 propagation channel in Bangkok environment for DTT network for portable in urban areas in Bangkok Thailand at MCOT channel 40 at the frequency 626MHz. In these results to evaluate the power loss, probability density function (pdf), commutative distribution function (cdf).

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