Presentation | 2003/1/10 An OFDM Adaptive Equalizer with FFT over Several Symbol Interval Sosavanh SANGSATHIT, Satoshi SUYAMA, Kazuhiko FUKAWA, Hiroshi SUZUKI, |
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Abstract(in Japanese) | (See Japanese page) |
Abstract(in English) | In mobile communication systems, the OFDM signal transmission severely suffers from both inter-symbol interferences (ISI) between the consecutive OFDM symbols, and inter-carrier interferences (ICI) among the sub-carriers, which are caused by the multi-path propagation with the delay time being larger than the guard interval (GI). This report proposes a new OFDM adaptive equalization method that can improve the transmission performance drastically by suppressing both ISI and ICI. The proposed equalizer performs the following three functions : (i)to suppress ICI by carrying out FFT during the plural OFDM symbol long interval including GI, (ii)to optimize the signal to noise ratio (SNR) by the minimum-mean-squared-error (MMSE) based linear filter, and (iii)to generate ISI replica by using the log-likelihood ratio (LLR) of the information bits supplied by a MAP decoder, so as to remove the ISI components in the decision-feedback equalization part. Computer simulations in accordance with the 5GHz band wireless LAN standardization demonstrate that the proposed equalization method yields an excellent level of the performances under the channel condition with the delay time being larger than GI. |
Keyword(in Japanese) | (See Japanese page) |
Keyword(in English) | Mobile communications / OFDM / guard interval / inter-symbol interference / inter-carrier interference / adaptive equalizer |
Paper # | DSP2002-201,SAT2002-151,RCS2002-270 |
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Conference Information | |
Committee | DSP |
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Conference Date | 2003/1/10(1days) |
Place (in Japanese) | (See Japanese page) |
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Paper Information | |
Registration To | Digital Signal Processing (DSP) |
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Language | JPN |
Title (in Japanese) | (See Japanese page) |
Sub Title (in Japanese) | (See Japanese page) |
Title (in English) | An OFDM Adaptive Equalizer with FFT over Several Symbol Interval |
Sub Title (in English) | |
Keyword(1) | Mobile communications |
Keyword(2) | OFDM |
Keyword(3) | guard interval |
Keyword(4) | inter-symbol interference |
Keyword(5) | inter-carrier interference |
Keyword(6) | adaptive equalizer |
1st Author's Name | Sosavanh SANGSATHIT |
1st Author's Affiliation | Tokyo Institute of Technology() |
2nd Author's Name | Satoshi SUYAMA |
2nd Author's Affiliation | Tokyo Institute of Technology |
3rd Author's Name | Kazuhiko FUKAWA |
3rd Author's Affiliation | Tokyo Institute of Technology |
4th Author's Name | Hiroshi SUZUKI |
4th Author's Affiliation | Tokyo Institute of Technology |
Date | 2003/1/10 |
Paper # | DSP2002-201,SAT2002-151,RCS2002-270 |
Volume (vol) | vol.102 |
Number (no) | 545 |
Page | pp.pp.- |
#Pages | 6 |
Date of Issue |