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Author: search.filters.author.Southisombath, Phouthong

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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
    ;
    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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    Void Handling by Utilizing Location-Based Assistance Through Trajectory Mapping
    (2023-01-01)
    Phoummavong, Phonepadith
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    Khieovongphachanh, Vimontha
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    Luangxaysana, Khanthanou
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    Southisombath, Phouthong
    ;
    Promwong, Sathaporn
    The Ad hoc Networks (MANETs) rely heavily on location-Aided routing protocols due to their energy-saving capabilities and ability to extend the network lifetime, especially in emergency situations where private IP addresses are unavailable. However, the route discovery process of the location-Aided routing (LAR) is ineffective in void zone environments where data packets cannot reach their intended destination. To address this issue, this paper presents a new approach called Location-Aided base on trajectory that eliminates the void zone. The results demonstrate that the proposed method outperforms existing approaches in terms of reachability, making it a more robust alternative to the default location-Aided routing protocol.
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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
    ;
    Khieovongphachanh, Vimontha
    ;
    Southisombath, Phouthong
    ;
    Chaisang, Aditep
    ;
    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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    Characterization of Electromagnetic Wave in Transformer for Partial Discharge Detection
    (2023-01-01)
    Suwan, Supakorn
    ;
    Tiengthong, Thanadol
    ;
    Southisombath, Phouthong
    ;
    Promwong, Sathaporn
    The increasing demand for electricity and the potential risks associated with partial discharge highlights the critical importance of robust transformer condition monitoring. Electromagnetic methods offer a promising approach to monitoring transformer health, benefiting from their ability to minimize external interference and their broad operating bandwidth covering HF, VHF, and UHF frequencies. The IEC 62478 standard provides multiple methodologies to leverage electromagnetic techniques in transformer health assessment, encompassing the analysis of electromagnetic waves through directivity, sensitivity, and transmission properties. In this study, we specifically investigate the transformer's UHF transmission characteristics. A vector network analyzer measures and records both transmitting and receiving elements of the UHF transmission channel and the UHF antenna. The measurements within the transformer tank simulate the realistic transformer environment. An optimum receiver is implemented at the receiver end to optimize the received signal quality. The results are comprehensively evaluated by analyzing the UHF transmission channel's path loss and transmission gain within the transformer. The primary objective of this research is to thoroughly examine the UHF transmission characteristics for efficient transformer condition monitoring, offering valuable insights for researchers and engineers involved in mitigating the risks associated with partial discharge in transformers.
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    Experimental study of ultra wideband human body channel
    (2016-09-06)
    Teawchim, Sanit
    ;
    Southisombath, Phouthong
    ;
    Promwong, Sathaporn
    This paper a study of UWB human body channel. The human body is more complex than other application. Therefore, to understand human body channel is so important. The analysis is based on the extension Friis' transmission formula that uses to characterize the WBAN channel transfer function. The rectangular passband waveform is used as UWB transmitted waveform. The channels of 5 positions on human body are measured by using vector network analyzer (VNA). The frequency channel transfer functions, power delay profile (PDP) and path loss are shown. The results are discussed in conclusion.
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    Evaluation of HB-UWB transmission model for body area network
    (2016-09-06)
    Southisombath, Khamphoui
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    Southisombath, Phouthong
    ;
    Promwong, Sathaporn
    Body area network (BAN) is becoming an increasingly important part of the wireless communication system and short range applications. Characteristic of ultra wideband impulse radio (UWB-IR) channel propagation is very important. The human body is more complex than other applications. Therefore, to understand the characteristics of the channel distribution on the human body is so important. This paper presents characteristic of channel propagation due to effect within human body and without human body for wireless applications based on measurement data. The template waveform is considered at the receiver side to maximize the SNR for evaluation. In this paper, the results are evaluated based on the extended Friis' transmission formula. This technique gives very accurate results and is very useful for the design and evaluation of UWB transmission for wireless medical applications, especially focusing on the effect of template waveform.
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    Performance evaluation of UWB communications with optimum receivers
    (2015-01-26)
    Bunpeng, Aompol
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    Jala, Akkarawut
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    Promwong, Sathaporn
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    Southisombath, Phouthong
    The 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.