Time domain equalization using linear phase interpolation for OFDM in time variant multipath channels with frequency offset

Han, Ki Young; Ha, Kilsik; Sung, Koeng-Mo; Lee, Choong Woong

doi:10.1109/vetecs.2000.851326

Cited by 3 publications

References 5 publications

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Complexity evaluation for the implementation of a pre-FFT equalizer in an OFDM receiver

Armour

Nix

Bull

2000

IEEE Trans. Consumer Electron.

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A Pre-FFT Equalizer (PFE) has been shown to offer a signifcant throughput efficiency improvement when applied to an OFDM receiver. Alternatively, the PFE can be used to increase the maximum delay spread conditions under which the OFDM system can operate effectively. Due to the manner of its operation, the PFE requires the use of modifed adaptation algorithms if iterative, decision directed, adaptation is required. In this paper, the computational complexity required to implement a PFE and a suitable adaptation strategy is evaluated. Initially, an LMS adaptation algorithm is investigated and evaluated in terms of its suitability for application in conjunction with the PFE to standards such as ETSI DVB-T and HIPERLAN/2 and IEEE 802.1 l a . The complexity requirements are found to be high, particularly in the case of DVB-T, The demand ,for a lower complexity adaptation algorithm is thus identified. As a result, a CSI-based adaptation method is subsequently considered, The complexity requirement of this algorithm is also analyzed and evaluated and is shown to be much lower than that of the LMS algorithm. Thus, it is shown that if the CSIbased adaptation method is used, the dominant complexity requirement is due to the implementation of the equalizingfilter and not the adaptation method. Reduced filter complexity requirement is thus shown to be the key to enabling effective application of the PFE. The ATSC 8-VSB standard is identified as a possible source of techniques to reduce or facilitate the high complexity demands for implementation of the PFE filter.

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Complexity evaluation for the implementation of a pre-FFT equalizer in an OFDM receiver

Armour

Nix

Bull

2000

IEEE Trans. Consumer Electron.

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MMSE-based equalization and ICI mitigation scheme for OFDM system over doubly selective channels

Wang

Huang

2014

2014 IEEE International Symposium on Broadband Multimedia Systems and Broadcasting

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Inter-carrier interference (ICI) caused by timevariant multi-path channels degrades the performance of orthogonal frequency division multiplexing (OFDM) based digital terrestrial television broadcasting systems, especially for large number of sub-carriers and high speed mobile reception. In this paper, we propose an minimum mean square error (MMSE) based equalization and ICI mitigation scheme for mobile HDTV transmission. Our algorithm applies a simplified MMSE equalizer before the calculation of ICI compensation term for ICI mitigation, while remains acceptable computational complexity for realization. Numerical simulation results show that the MMSE-based algorithm outperforms the zero-forcing (ZF) equalizer, especially for large Doppler frequency offsets.

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A novel adaptive antenna architecture - subcarrier clustering for high-speed OFDM systems in presence of rich co-channel interference

Sun

Matsuoka²

Vehicular Technology Conference. IEEE 55th Vehicular Technology Conference. VTC Spring 2002 (Cat. No.02CH37367)

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Time domain equalization using linear phase interpolation for OFDM in time variant multipath channels with frequency offset

Cited by 3 publications

References 5 publications

Complexity evaluation for the implementation of a pre-FFT equalizer in an OFDM receiver

Complexity evaluation for the implementation of a pre-FFT equalizer in an OFDM receiver

MMSE-based equalization and ICI mitigation scheme for OFDM system over doubly selective channels

A novel adaptive antenna architecture - subcarrier clustering for high-speed OFDM systems in presence of rich co-channel interference

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