Boonsrimuang, Pisit

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Boonsrimuang, Pisit
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Boonsrimuang, P.
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pisit.bo@kmitl.ac.th

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    Iterative based ML demodulation method for OFDM signal under higher mobile environments
    (2015-07-01)
    Reangsuntea, Pongsathorn
    ;
    Hourai, Mio
    ;
    Mori, Kazuo
    ;
    Boonsrimuang, Pisit
    ;
    Kobayashi, Hideo
    Orthogonal Frequency Division Multiplexing (OFDM) signal would be damaged significantly by inter- carrier interference (ICI) in higher time-varying fading channels which leads fatal degradation of bit error rate (BER) performance due to the loss of orthogonality among subcarriers. To solve this problem, this paper proposes an iterative based maximum likelihood demodulation (MLD) method which can achieve better BER performance with lower computation complexity even in higher time-varying fading channels. The features of proposed method are to employ a time domain training sequence (TS) in the estimation of channel impulse response (CIR) instead of using pilot subcarriers in the frequency domain and to employ a time domain equalization (TDE) method with a maximum likelihood (ML) estimation instead of using a conventional frequency domain equalization (FDE) method. This paper also proposes a low-complexity iterative method for solving the simultaneous equations in the MLD method instead of using an inverse matrix calculation. This paper presents various simulation results in higher time-varying fading channels to demonstrate the effectiveness of proposed method as comparing with the conventional frequency domain equalization method.
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    Iterative based time domain equalization method for OFDM signal under high mobile environments
    (2014-01-23)
    Reangsuntea, Pongsathorn
    ;
    Mori, Kazuo
    ;
    Kobayashi, Hideo
    ;
    Boonsrimuang, Pisit
    A loss of subcarrier orthogonality in orthogonal frequency division multiplexing (OFDM) signal due to time-varying multipath fading channel causes an inter-carrier interference (ICI) which would lead fatal degradation of bit error rate (BER) performance. To solve this problem, this paper proposes a high accuracy time domain channel impulse response (CIR) estimation method and a time domain equalization (TDE) method of using estimated CIR at every sampling time in conjunction with a low-complexity iterative method instead of using an inverse matrix calculation. The salient feature of proposed method is to employ a time-domain training sequence (TS) for the estimation of CIR at every sampling time and low-complexity iterative method for solving the simultaneous equations which are required in the TDE method. This paper presents various simulation results to demonstrate the effectiveness of proposed TDE method as comparing with the conventional frequency domain equalization (FDE) method.
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    Iterative based time domain equalization method for DFTS-OFDM under highly mobile environments
    (2016-09-06)
    Reangsuntea, Arttapol
    ;
    Boonsrimuang, Pisit
    ;
    Reangsuntea, Pongsathorn
    ;
    Mori, Kazuo
    ;
    Kobayashi, Hideo
    Under highly mobile environments, the bit error rate (BER) performance of DFT spreading-orthogonal frequency division multiplexing (DFTS-OFDM) signal with a frequency domain equalization method would be degraded relatively due to the loss of orthogonality among subcarriers. To solve this problem, this paper proposes an iterative based time domain equalization (TDE) technique with a time domain channel impulse response (CIR) estimation method for the DFTS-OFDM signal. The salient features of proposed method are to employ a time domain training sequence (TS) in the estimation of CIR instead of using the conventional pilot subcarriers method and to employ the TDE technique with a maximum likelihood (ML) estimation method instead of using the conventional minimum mean square error frequency domain equalization (MMSE-FDE) method. This paper also proposes a low-complexity iterative method for the TDE method by using the preconditioned conjugate gradient squared (PCGS) algorithm for solving the simultaneous equations instead of using a direct calculation of inverse matrix. This paper presents various simulation results under highly mobile environments to demonstrate the effectiveness of proposed iterative based TDE with the CIR estimation method for the DFTS-OFDM signal as comparing with the conventional MMSE-FDE method.
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    A low complexity IPTS-based extended split-radix IFFT for PAPR reduction in OFDM systems
    (2012-10-02)
    Boonsrimuang, Pornpawit
    ;
    Jirajaracheep, Panya
    ;
    Reangsuntea, Pongsathorn
    ;
    Boonsrimuang, Pisit
    ;
    Kobayashi, Hideo
    The Partial Transmit Sequence (PTS) method with low computation complexity, called decomposition PTS sub-blocking was proposed which employs the radix-2 inverse fast Fourier transform (IFFT) for the signals at the middle stages of an N-point radix-2 IFFT and decimation in frequency (DIF) domain. This method (DIF-IFFT) can reduce the computation complexity relatively with keeping the better PAPR performance similar to other PTS techniques with using the same weighting factor. To improve computation complexity for the PTS method, the Extended Split-Radix inverse fast Fourier transform (SRIFFT) which can reduces the number of computation complexity was proposed. However, the PAPR reduction performance is the same as that for the radix-2 method. In this paper, we propose a new weighting factor technique in conjunction with DIF-PTS sub-blocking based on Extended Split-Radix IFFT technique called Improve PTS (I-PTS) which can improve both the PAPR performance and computation complexity without any increasing of side information. This paper presents the various computer simulation results to verify the effectiveness of proposed method. © 2012 IEEE.
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    Low-complexity MMSE-FDE method for TS-OFDM signal under high mobile environments
    (2016-12-16)
    Reangsuntea, Pongsathorn
    ;
    Sanada, Kousuke
    ;
    Mori, Kazuo
    ;
    Kobayashi, Hideo
    ;
    Boonsrimuang, Pisit
    This paper proposes a minimum mean square error-frequency domain equalization (MMSE-FDE) method for training sequence inserted orthogonal frequency division multiplexing (TS-OFDM) signal under high mobile environments. The salient features of proposed method are to enable the acquisition of frequency diversity gain by using the enhanced CIR matrix and to enable the reduction of complexity by employing the fast algorithm for inverse matrix calculation. From the simulation results, this paper confirms that the proposed method can achieve better bit error rate (BER) performance than the conventional MMSE-FDE methods with keeping lower complexity.
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    Time domain equalization method for TS-OFDM signal under higher mobile environments
    (2017-12-01)
    Reangsuntea, Pongsathorn
    ;
    Boonsrimuang, Pisit
    ;
    Mori, Kazuo
    ;
    Kobayashi, Hideo
    In higher time-varying fading channels, the signal quality of orthogonal frequency division multiplexing (OFDM) technique would be degraded relatively due to the occurrence of inter-carrier interference (ICI). To solve this problem, this paper firstly proposes a new design of time domain training sequence (TS) in the estimation of channel impulse response (CIR) for the TS-OFDM signal which can reduce the leakage of power spectrum density (PSD) at the outside of OFDM allocated frequency bandwidth with keeping higher CIR estimation accuracy. Secondly, this paper proposes a time domain equalization (TDE) method which can achieve better bit error rate (BER) performance with keeping lower computation complexity even in higher time-varying fading channels. The salient feature of the proposed TDE method is to employ a partial differentiation for the time domain CIR matrix for solving the maximum likelihood (ML) equation in which the time domain CIR matrix becomes a symmetric banded matrix. From this feature, a low-complexity parallel block inverse matrix algorithm can be employed in the calculation of inverse matrix in keeping the same accuracy as that of the direct inverse matrix calculation. This paper presents various computer simulation results to demonstrate the effectiveness of the proposed TDE method for the TS-OFDM signal as compared with conventional frequency domain equalization (FDE) methods under higher mobile environments.
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    Low-complexity based TDE Method for OFDM signal in higher time-varying fading channels
    (2020-01-01)
    Tanangsanakool, Saha
    ;
    Reangsuntea, Pongsathorn
    ;
    Mori, Kazuo
    ;
    Boonsrimuang, Pisit
    Orthogonal Frequency Division Multiplexing (OFDM) signal would be damaged significantly by inter-carrier interference (ICI) in higher time-varying fading channels. The ICI leads to fatal degradation of bit error rate (BER) performance due to the loss of orthogonality among subcarriers. To solve this problem, this paper proposes a high accuracy time-domain channel impulse response (CIR) estimation method and low-complexity based time-domain equalization (TDE) method for solving the simultaneous equations instead of using an inverse matrix calculation which can achieve better BER performance and lower computation complexity even in higher time-varying fading channels. The salient features of proposed method are to employ a time-domain training sequence (TS) in the estimation of channel impulse response (CIR) instead of using pilot subcarriers in the frequency domain and to employ the time domain equalization (TDE) method with maximum likelihood (ML) estimation instead of using a conventional frequency domain equalization (FDE) method. This paper also proposes a low-complexity iterative method for solving the simultaneous equations instead of using an inverse matrix calculation, which remains the computation complexity up to 7.8% of inverse matrix calculation with the same BER performance but achieves the BER performance when compared with the conventional method. This paper presents various simulation results in higher time-varying fading channels (vehicle speed ≈ 381 km/hrs) to demonstrate the effectiveness of the proposed method as compared with conventional FDE and TDE methods.
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    Cell throughput based sleep control scheme for heterogeneous cellular networks
    (2017-11-03)
    Phaiwitthayaphorn, Prapassorn
    ;
    Boonsrimuang, Pisit
    ;
    Reangsuntea, Pongsathorn
    ;
    Fujii, Takashi
    ;
    Sanada, Kosuke
    Recently, the concept of heterogeneous networks (HetNets) has been proposed as an alternative solution to provide higher coverage and capacity for cellular networks. In HetNets concept, many of small base stations (SBSs) are employed in the existing cell of macro base stations (MBSs) to increase the coverage and system capacity. However, the employment of many SBSs in the existing macro cells would causes the increase in power consumption with decreasing the energy efficiency in downlink cellular networks. To solve this problem, this paper proposes a cell throughput based sleep control scheme for the SBSs in HetNets. In the proposed scheme, the cell capacity ratio for the SBSs is employed as decision criteria to put the SBSs into sleep state. From various simulation results, the proposed scheme can achieve better energy efficiency and better system throughput than the conventional schemes.
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    Low-complexity FDE method for TS-OFDM signal under higher time-varying channels
    (2016-09-06)
    Reangsuntea, Pongsathorn
    ;
    Mori, Kazuo
    ;
    Kobayashi, Hideo
    ;
    Reangsuntea, Arttapol
    ;
    Boonsrimuang, Pisit
    A losing of orthogonality among subcarriers in higher time-varying fading channels causes an inter-carrier interference (ICI) in orthogonal frequency division multiplexing (OFDM) signal which leads a fatal degradation both for the channel estimation accuracy and bit error rate (BER) performances. To solve this problem, this paper firstly proposes a channel estimation method with a new design of time domain training sequence (TS) of using a triangular window function which can achieve higher channel estimation accuracy with keeping lower leakage of power spectrum density (PSD) at the outside of OFDM allocated frequency bandwidth than the conventional TS signal. Secondly, this paper proposes a low-complexity frequency domain equalization (FDE) method which can achieve better BER performance than the conventional one-tap FDE method. The feature of proposed FDE method is to enable the reduction of complexity by using a Maclaurin's expansion algorithm in the inverse matrix calculation. This paper presents various computer simulation results to demonstrate the effectiveness of proposed FDE method as comparing with the conventional FDE methods.
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    A new weighting factor of PTS OFDM with low complexity based on Split-Radix IFFT for PAPR reduction
    (2012-05-09)
    Boonsrimuang, Pornpawit
    ;
    Reangsuntea, Pongsathorn
    ;
    Boonsrimuang, Pisit
    ;
    Kobayashi, Hideo
    The Partial Transmit Sequence (PTS) method with low computation complexity, called decomposition PTS sub-blocking was proposed which employs the radix-2 inverse fast Fourier transform (IFFT) for the signals at the middle stages of an N-point radix-2 IFFT and decimation in frequency (DIF) domain. This method (DIF-IFFT) can reduce the computation complexity relatively with keeping the better PAPR performance similar to other PTS techniques with using the same weighting factor. To improve computation complexity for the PTS method, the Split-Radix inverse fast Fourier transform (SRIFFT) which can reduces the number of complex computation was proposed. However, the PAPR reduction performance is the same as that for the radix-2 method. In this paper, we propose a new weighting factor technique in conjunction with DIF-PTS sub-blocking based on Split-Radix IFFT technique called Improve PTS (I-PTS) which can improve both the PAPR performance and computation complexity without any increasing of side information. This paper presents the various computer simulation results to verifier the effectiveness of proposed method. © 2012 GIRI.