Tiengthong, Thanadol
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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, Zigbee wireless sensor network localization evaluation schemewith weighted centroid method(2018-08-14); 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. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Complex form in fresnel region analysis for partial discharge in transformer(2019-07-01); The distortion of the antenna is very critical problem which must take into account for deal with the frequency characteristic of the antenna for partial discharge diagnosis in transformer. The complex form of Friis' equation is present to analyze the Fresnel region of the antenna. The original form of Friis' equation is normally applied in the far field zone. This study considers the complex form of Friis' equation in the transformer, however, the environment in the transformer may not satisfy with the distance conditions according to the Fresnel region. Nonetheless, in this paper, the evaluation of antenna performance in Fresnel region is discussed. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Delay characteristics of UWB transmission waveform with human body for WBAN system(2018-06-08); ; Deepunya, ChairakAs one of the most interested short range wireless communication technology, Wireless Body Area Network (WBAN) had been widely development. IEEE 802.15.6 is defining the requirement for wireless body area network such as coexist with other wireless technology and low power spectrum. Ultra wideband (UWB) is the promising technology for wireless body area network. It has wide operated frequency bandwidth from 3 GHz to 10.6 GHz and low power radiation below-41.3 dBm/MHz. The application for WBAN can be mainly divided into medical and non-medical. It can use in-body, on-body and off-body. The effect of human body is investigating in this paper. The experimental model will consider about position and distant between receiver antenna and human body. Vector network analyzer is used to measure transfer function and biconical antennas are used as the transmitter antenna and receiver antenna. The results are describing in power delay profile, which present the effect of human body in transmission for WBAN application. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Evaluation of partial discharge localization in power transformer with weighted centroid method(2019-07-01); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, WLAN Localization Measurement and Analysis Using RSS and TOA Positioning Methods(2018-07-02); Wireless local area network (WLAN) has been exclusively research due to its widely used applications. Its operate frequency spectrum is in the ISM band and regulated in IEEE 802.11 family. Localization is one of the application which able to used WLAN signal. Its can be used in various applications such as logistics, security, disaster rescue operation tracking, and military service. Since the various kind of its applications is work in indoor environment, the indoor localization requires high accuracy. The receive signal strength (RSS) and time of arrival (TOA) are a parameter that used in the comparison between min-max technique and trilateration technique in this paper. In the measurement of this research, the frequency bandwidth is ranging from 2.3 GHz to 2.5 GHz, an access point is used to represent both of transmit antenna and receive antenna. The cumulative distribution function (CDF) is used for study the most accuracy. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Modulation error ratio gain of single frequency network in DVB-T2(2019-04-15); ; Ruckveratham, BunditDVB-T2 broadcasting with a single frequency network allows an efficient management of frequency utilization and extend the coverage area, which will enable more people to view a broadcast. The SFN mode also increases the concentration of the signal in overlap areas. However, some different of overlap areas in actual use of SFN networks may have some degradation of the received signal due to the effect of the SFN. In this research, we analyze SFN broadcasting in SISO mode. This paper represents the effects of delays on the SFN signal over different delay times within the guard interval by analyzing the minimum reception threshold. The analysis of received signal power, MER, bBER, LBER, and noise margin are studied using an actual digital television transmitter for the experiment. The results show that the minimum thresholds for a delay time at 0 microseconds will require higher receive signal power than other delay times within the GI. The results of this experiment are useful in designing the SFN network and make it possible to determine the appropriate C/N threshold for the design of the digital terrestrial television network. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Experimental evaluation scheme of DTTV propagation loss in Thailand(2019-07-01); ; 1