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Author: search.filters.author.Duangsuwan, S.

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    A RFID reader suppressive interferences due to multipath
    (2012-11-12)
    Duangsuwan, S.
    ;
    Promwong, S.
    Theradio-frequency identification(RFID)are growingrapidly, especially at 2.45 GHz that is very high speed transmission for toll collection. In addition, there are many problems from the effects of interference due to multipath fading, which leading to bandwidth limitation and channel distortion. Consequently, the rapidly signal processing of RFID reader could be still lacks the demands on improvement. The interference cancelation is proposed by using the blind filtering equalization on previously. In this paper, we proposed the suppressive interfering due to multipath rician fading chanenl based on the successive interference cancellation (SIC) technique for improve the convergence of the constant modulus (CM) algorithm. Also as the result, the quantitative evaluation of mitigate interferences are shown.
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    Experimental study for polarimetric measurement of RFID transfer function with in an indoor environment
    (2009-12-01)
    Duangsuwan, S.
    ;
    Leukachorn, T.
    ;
    Chinsawatpan, S.
    ;
    Promwong, S.
    Radio Frequency Identification (RFID), is unlicensed industrial, scientific, and medical (ISM) band at 2.4 GHz. The same principle as that used in long-range radio communication links. The reader's antenna generates a propagating radio wave use far-field communication, which is received by the antenna in the tag. This paper, the microstrip patch antennas used both for transmitter antenna and receiver antenna likewise the reader antenna and tag antenna, simple patch antenna of this type radiates a linearly polarized wave. We investigated the transmission loss the RFID short range systems. Furthermore, we believed our studies can be designed the antennas for RFID systems. ©2009 IEEE.
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    Measurement and evaluation of RFID transmission characteristic for long range systems
    (2009-11-18)
    Duangsuwan, S.
    ;
    Promwong, S.
    ;
    Chengtanomwong, P.
    The radio frequency identification (RFID) is a wireless communications that lets computer reads the identity to tag at 2:45 GHz can be fast identified the high speeds at 3 meters read range guaranteed at speeds of 100 km/hr. This paper used the model for expressway by supposing receiver moves to fixed transmitter, the microstrip antenna was used for both transmitter and receiver, The Friis's transmission formula is used for analysis. We considered characteristics of antennas performance at each distance transmission channel, magnitude and phase channel transfer function, bit error rate, path loss and rms delay spread were the results of experimental. This technique is very to useful for analyzed the signal performance and transmission signal in the RFID networks. © 2009 IEEE.
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    Measurement and modeling of RFID propagation channel with in an indoor environment
    (2008-12-01)
    Duangsuwan, S.
    ;
    Promwong, S.
    ;
    Sukutamatanti, N.
    The radio frequency identification (RFID) technology was automatic identify becomes was essential in the service an indoor environment such as contactless smart card and libraries [10] at high frequency in free space transfer function in wireless communication usually consider used Friss's formula for analysis. This paper the RFID propagation channel at 2.45 GHz with indoor environment. The measurement result are evaluation by using Friis's transmission formula to find the magnitude and phase channel transfer function, path loss, and power delay profile. This technique is very useful for analyzed the signal strength and radio propagation loss of RFID transmission signal © 2008 IEEE.