| 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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| PDF Download Page | PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | In mobile communication systems, the OFDM signal transmission severely suffers from both intersymbol interfer-ences (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 5 GHz 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 / adaptiveequalizer |
| Paper # | DSP2002-201,SAT2002-151,RCS2002-270 |
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| Conference Information | |
| Committee | SAT |
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| Conference Date | 2003/1/10(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Satellite Telecommunications (SAT) |
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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) | adaptiveequalizer |
| 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) | 548 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |