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Author: search.filters.author.Mata, TanairatSubject: search.filters.subject.channel estimation

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    An efficient uplink OFDMA channel estimation under high-speed mobile environment
    (2017-11-03)
    Aiempo, Pimracha
    ;
    Boonsrimuang, Pisit
    ;
    Mata, Tanairat
    ;
    Anunvrapong, Pramote
    OFDMA (Orthogonal Frequency Division Multiple Access) was known extensively for operating in various mobile communication systems. In OFDMA system, there are two parts of communication link, uplink which the uplink OFDMA is considered in this paper, and downlink. In uplink OFDMA communication, all users send their information signals to base station at the same time. Each channel between user and base station requires to be estimated from the combined received signals at base station. From this reason, this paper proposes a channel estimation method for actual uplink OFDMA system which N points IFFT/FFT is larger than M data subcarriers (N>M) which can provide more accuracy for channel estimation. In the computer simulation results, the normalized mean square error (NMSE) performance is evaluated for the channel estimation accuracy under high-speed mobile environment. There is 12dB gain at 10<sup>-1</sup> of NMSE for the proposed method over the conventional method as shown in the result.
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    Proposal of channel estimation scheme for practical V-BLAST MIMO-OFDM system
    (2017-07-01)
    Inkamchua, Nakarin
    ;
    Boonsrimuang, Pisit
    ;
    Mata, Tanairat
    ;
    Sopin, Anan
    In wireless communication, multiple input and multiple output technique is often applied with orthogonal frequency division multiplexing (MIMO-OFDM) because of its many advantages such as spectral efficiency, link reliability, diversity gain and so on. In the practical MIMO-OFDM system, it has a signal aliasing problem due to the mismatch of sampling from adding zero padding at both front and rear of data transmission in each OFDM symbol. To solve this problem, the channel estimation by using the new comb-type pilot symbol arrangement scheme is proposed for the practical MIMO-OFDM system. From the computer results, it can be shown that the proposed channel estimation scheme can perform higher system performances than the conventional scheme in the practical V- BLAST MIMO-OFDM system.