Cherntanomwong, Panarat

Preferred name

Main Affiliation

School of Engineering

panarat.ch@kmitl.ac.th

Now showing 1 - 10 of 14

Some of the metrics are blocked by your
consent settings
Location fingerprint technique using Fuzzy C-Means clustering algorithm for indoor localization
(2011-12-01)
Suroso, Dwi Joko
;
Cherntanomwong, Panarat
;
Sooraksa, Pitikhate
;
Takada, Jun Ichi
The recent researches in localization technique have been supported by the emerging of wireless sensor network (WSN) technology. The issues of power and time consumption have become the main research topics in WSN-based localization technique. ZigBee as IEEE 802.15.4 is commonly used as supporting device because of its advantages for low-power, small and smart sensor nodes. This paper proposes the new technique in radio frequency (RF) fingerprint technique-based localization using Fuzzy C-Means (FCM) clustering algorithm. This technique provides an efficient localization system that gives benefit in the time-efficient and low power consumption. In this paper, received signal strength indicator (RSSI) is used as the fingerprint information which indicates the location of sensor nodes. The different amount of the reference nodes is applied. The effectiveness of this method is verified by an indoor experiment. The estimated location results from different sets of reference nodes are compared. The time consumption in experiment is compared with those using the common fingerprint technique. © 2011 IEEE.
Some of the metrics are blocked by your
consent settings
The repeater system for visible light communication
(2015-01-01)
Cherntanomwong, Panarat
;
Namonta, Pornchanok
Visible Light Communication (VLC) Technology is the short range optical wireless communication technology using LEDs for communication and illumination. In this paper, we propose a repeater system for visible light communication to extend the coverage. Our proposed repeater system is composed of hardware and software components. The transmitter converts text data sending from the user into light signal data by using the on-off keying modulation (OOK) technique and transmits this signal via LED. The repeater receives light signal data by photodiode then transmits it out again. With this method, light signal is amplified at each repeater. The receiver converts light signal data back into text data and displays it on user interface for further use. This multi-hop communication gives more flexibility in communication because it helps to increase the distance between transmitter terminal and receiver terminal. Moreover, it also helps to avoid obstacle objects, such as walls, because VLC is a line-of-sight technology.
Some of the metrics are blocked by your
consent settings
Soft-clustering technique for fingerprint-based localization
(2018-01-01)
Cherntanomwong, Panarat
;
Sooraksa, Pitikhate
In this paper, the soft-clustering algorithm for the fingerprint-based localization technique is proposed. In an indoor environment, the fingerprint-based localization technique is usually employed since it can deal with signal fluctuation. Its basic principle is to find the target location by comparing its signal parameters with a previously recorded database of knownlocation- signal parameters. Here, the received signal strength indicator (RSSI) provided by the wireless sensor network (WSN) is used as the signal parameter. The high accuracy of location estimation requires a very fine spatial resolution of the database, corresponding to the time consumed for pattern matching. To reduce the calculation time, clustering can be applied because it can reduce the database size by grouping similar data in the same cluster. The accuracy of the algorithm to cluster the target location and fingerprint locations is the main concern. The result shows that the clustering technique used can successfully cluster the target sensing node into an appropriate cluster. This implies that, by using soft clustering with the fingerprint technique, the target location can be estimated faster than by using classical fingerprint techniques since the target location can be estimated within a small set of fingerprints in the cluster, not with all fingerprints in the database.
Some of the metrics are blocked by your
consent settings
Performance test of low-complexity visible light communication system
(2017-07-02)
Luckyarno, Yakub Fahim
;
Namonta, Pornchanok
;
Cherntanomwong, Panarat
A visible light communication (VLC) is an optical wireless communication technology that developed rapidly in recent years. The most common application of it is for indoor communication. Many researchers already conducted researches in various fields of this technology, but only a few researchers conducted the research based on the standard. Some of them conducted simulation-based but not hardware-based research. This research proposes a low-complexity system based on the IEEE 802.15.7 standard PHY I. It consists of a pair of transceivers. The transceiver consists of the LED with the lens as the transmitter and the high-speed photodiode as the receiver. This research focuses on how the PHY I-based system performs by testing the system using some parameters, which are throughput, distance, bit error rate (BER), and types of files. The expected result is that the system can send various-size data of any file with a data rate of 100 kbps, low BER, and in a far distance. This paper will explain further information in detail.
Some of the metrics are blocked by your
consent settings
Indoor localization system using visible light communication
(2015-01-01)
Cherntanomwong, Panarat
;
Chantharasena, Wisarut
Visible light communication (VLC) has recently become popular due to its benefit of VLC. VLC can provide not only the data communication via light, but also illumination. Indoor localization using VLC is a solution to locate objects or people inside a building using visible light wave by reading the identification data from visible light tubes. However, the identification data cannot be read in the light overlapping area. Time division multiplexing (TDM) is used to deal with this issue. In this work, the proximity technique is used for localization. The LED spotlights at fixed locations are used as transmitters that transmit their unique IDs, while the photodiode is used as a target receiver. By using the proximity technique, the location of the target is identified using one received ID or more.
Some of the metrics are blocked by your
consent settings
The comparison of optical beam tracking algorithm for free space optics
(2017-10-19)
Nakarach, Nuttapon
;
Cherntanomwong, Panarat
Free Space Optics (FSO) is the technology which has robustness in transmitting a large amount of data and energy efficient. However, there are other factors to make the FSO system more efficient. One of them is the optical beam tracking. This factor will use the optical alignment mechanism to align the optical transceiver to the maximum power point. In order to maximize the power, the tracking algorithm will apply to the mechanism. In this study these tracking algorithms which are simple peaking, step track algorithm (gradient method) and 4 Quadrant Detectors were used to peak the transponder to the maximum energy position. The simulation results show the processing time and efficiency for each algorithm. This result also shows that which algorithm is suitable for which free space optics application.
Some of the metrics are blocked by your
consent settings
Fingerprint-based technique for indoor localization in wireless sensor networks using Fuzzy C-Means clustering algorithm
(2011-12-01)
Suroso, Dwi Joko
;
Cherntanomwong, Panarat
;
Sooraksa, Pitikhate
;
Takada, Jun Ichi
ZigBee as IEEE 802.15.4 standard has been using for main research topic in the wireless sensor network (WSN) applications. The new method of radio frequency (RF) fingerprint-based technique for indoor localization is proposed. The received signal strength indicator (RSSI) is used as database values which correspond to the location of the sensor nodes. Fuzzy C-Means (FCM) clustering algorithm is applied as the experiment data cluster method. FCM algorithm is deployed to cluster the obtained feature vectors into several classes corresponding to the different amount of RSSI values. The results show that FCM can cluster the target node in a group of the fingerprint database. The location of target node is arranged in various forms to validate the accuracy of the clustering technique. Euclidean distance is used as the parameter to compare the similarity between fingerprint database and the target location. The results show that the new method is simple and effective method to reduce the complexity and to support the low power and to reduce the time using in the fingerprint-based localization technique. © 2011 IEEE.
Some of the metrics are blocked by your
consent settings
Step track algorithm in Free Space Optics
(2015-01-01)
Nakarach, Nuttapon
;
Cherntanomwong, Panarat
Free Space Optics (FSO) are going to be popular in a variety of the communications due to the higher bandwidth and data rate compared with the microwave communication systems. However, there are other factors to make the FSO system more efficient. One of them is the beam alignment. In this paper, the transponder alignment for FSO is investigated. In this paper the gradient technique, one of step track algorithm, employed for transponder alignment. The simulation results show that the gradient technique can be used for beam alignment of the optical transponder.
Some of the metrics are blocked by your
consent settings
Posturometry data transmission using visible light communication
(2016-09-06)
Luckyarno, Yakub Fahim
;
Cherntanomwong, Panarat
;
Wijaya, Rony
In recent years, a visible light communication (VLC) is developed rapidly. One of its application is in a hospital for avoiding electromagnetic interference (EMI). Some researchers conclude that a hospital should have less, even no, EMI, that can be produced from the use of radio frequency, such as Wi-Fi. One of instruments used in a hospital is called a posturometry. In this paper, we propose a prototype, which is a development from [8], to send a posturometry data using VLC. It consists of a white LED as the transmitter, Programmable System-on-Chip (PSoC) as the controller and a phototransistor as the receiver. It can send data in a distance of 2 meters and every 15 ms per bit. A detail explanation is presented in this paper.
Some of the metrics are blocked by your
consent settings
The improvement of repeater system for Visible Light Communication
(2016-09-06)
Namonta, Pornchanok
;
Cherntanomwong, Panarat
Visible Light Communication (VLC) Technology is the short range optical wireless communication technology using LEDs for communication and illumination. In this paper, we propose the improvement of the repeater system for visible light communication. Not just to extend the coverage, but also to transfer file and to increase the communication speed. Our proposed repeater system is composed of hardware and software components. The transmitter opens, splits, and sends a file with RS-232 serial communication interface. The byte data type is converted into light signal data type by using the on-off keying modulation (OOK) technique and is transmitted via LED. The repeater receives light signal data by photodiode then transmits it out again. With this method, light signal is amplified at each repeater. The receiver converts light signal data back into byte data and combines each set of bytes together, then the file can be saved by the user. This multi-hop communication gives more flexibility in communication because it helps to increase the distance between transmitter terminal and receiver terminal. Moreover, it also helps to avoid obstacle objects, such as walls, because VLC is a Line-of-Sight (LOS) technology. This system is improved from our previous system in terms of the number of sending character and the communication speed.

Cherntanomwong, Panarat

Filters

Settings

Sort By

Results per page