Low-complexity based TDE Method for OFDM signal in higher time-varying fading channels

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dc.contributor.authorTanangsanakool, Saha
dc.contributor.authorReangsuntea, Pongsathorn
dc.contributor.authorMori, Kazuo
dc.contributor.authorBoonsrimuang, Pisit
dc.date.accessioned2026-08-06T10:27:06Z
dc.date.available2026-08-06T10:27:06Z
dc.date.issued2020-01-01
dc.description.abstractOrthogonal 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.
dc.identifier.citationInternational Journal of Intelligent Engineering and Systems, 13(4), 21-32, 2020
dc.identifier.doi10.22266/IJIES2020.0831.03
dc.identifier.issn2185310X
dc.identifier.other2-s2.0-85089555118
dc.identifier.urihttps://dspace.kmitl.ac.th/handle/123456789/10556
dc.sourceInternational Journal of Intelligent Engineering and Systems
dc.subjectCIR
dc.subjectFDE
dc.subjectICI
dc.subjectMaximum likelihood (ML) estimation
dc.subjectOFDM
dc.subjectTDE
dc.subjectTraining sequence (TS)
dc.titleLow-complexity based TDE Method for OFDM signal in higher time-varying fading channels
dc.typeArticle

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