Pomsathit, Auttapon

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Pomsathit, Auttapon
Alternative Name
Pomsathit, A.
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Email
auttapon.po@kmitl.ac.th

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    Item type:Publication,
    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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    Item type:Publication,
    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.