Pomsathit, Auttapon

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Pomsathit, Auttapon
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Pomsathit, A.
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auttapon.po@kmitl.ac.th

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    Variable step-size algorithm for lattice form structure adaptive IIR notch filter
    (2006-12-01)
    Pomsathit, A.
    ;
    Wattanaluk, P.
    ;
    Sangaroon, O.
    ;
    Benjangkaprasert, C.
    In this paper, a new class of a variable step-size algorithm for a second-order lattice form structure adaptive IIR notch filter for detection of sinusoids in noise environments is presented. The proposed algorithm is adjusting two variable coefficients of the adaptive IIR notch filter : one is variable notch frequency and the other is variable notch bandwidth. By the proposed method, the optimization of the coefficients of the filter is obtained. The computer simulation results are shown that the proposed algorithm provides fast convergence speed, low mean square error, low variance of filter coefficients and high impulsive noise robustness. Moreover, to verify the new adaptive algorithm by application to reducing 50-Hz interference in ECG signal. As results, it is evident that the new algorithm gives a good performance. © 2006 IEEE.
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    Microstrip line coupled triangular slot antenna
    (2002-01-01)
    Anantrasirichai, N.
    ;
    Pomsathit, A.
    ;
    Benjangkaprasert, C.
    ;
    Wakabayashi, T.
    This paper describes the triangular slot antenna in the ground plane of the microstrip line. The slot antenna coupled by microstrip line are proposed, and the characteristics of input impedance, S parameter and far field patterns of radiation are obtained by using the finite difference time domain (FDTD) method.
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    Circularly polarized right angle slot antennas for WLAN of IEEE 802.11b/g
    (2008-12-01)
    Pomsathit, A.
    ;
    Benjangkaprasert, C.
    ;
    Anantrasirichai, N.
    ;
    Chutchavong, V.
    ;
    Wakabayashi, T.
    In this paper, the design consideration for right-hand (clockwise) and left-hand (counterclockwise) circularly polarized microstrip slot antennas are presented. The circularly polarized antenna consists of two right angle slot antennas that is two orthogonal modes in phase quadrature or an array of linearly polarized slot with proper orientations and phases. This antenna can generate circular polarization by radiating orthogonal field components from two slots with equal amplitude but in phase quadrature. Two orientations for circularly polarized are investigated in this paper from simulation and measurement results are shown at resonance frequency 2.45 GHz on return loss, VSWR and radiation patterns.I © 2008 IEEE.
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    Performance analysis of space diversity for OFDM transmission
    (2008-12-01)
    Lorphichian, Aekkarat
    ;
    Pomsathit, Auttapon
    ;
    Nakasuwan, Jintana
    ;
    Srikalsin, Thanupong
    ;
    Benjangkaprasert, Chawalit
    This paper presents a simple space diversity scheme for orthogonal frequency-division multiplexing (OFDM) transmission. Using multiple antenna technology provides the same diversity order as maximal-ratio receiver combining (MRRC). It is also shown that the scheme may easily be generalized to M transmit antennas and M receive antennas to provide a diversity order of 2M. We examine feasibility of several types of OFDM transmitter diversity techniques and generate data for the third-generation wireless systems. In particular, single input single output (SISO), single input multiple output (SIMO), multiple input single output (MISO), and multiple input multiple output (MIMO) techniques are compared. We employ the long range AWGN channel to enable transmitter diversity.
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    Performance analysis of channel effective for wireless LAN and wireless ad-hoc networks
    (2008-12-01)
    Pomsathit, Auttapon
    ;
    Nakasuwan, Jintana
    ;
    Lorphichian, Aekkarat
    ;
    Benjangkaprasert, Chawalit
    Wireless local area networks (WLANs) provide mobility and convenience to users, the efficiency of today's WLANs are still far from satisfactory. In this paper discusses the performance of WLANs and wireless Ad-Hoc networks, our main contribution is analyze several methods to compare the throughput performance on simulation and experimental results. We describe NS-2 (Network Simulation) implementations for fine-tuning WLAN and wireless Ad-Hoc network parameters such as the physical layer (IEEE802.ll) datalink layer (MAC) and network layer (Routing Protocol) related parameters. Customizing these parameters oppose to using the values specified in the standards will increase throughput and channel utilization under fixed load conditions.