| Presentation | 2006-07-20 Iterative Detection and Channel Estimation Employing Adaptive Tap Selection for Scattered Pilot OFDM Receiver Katsuya KATO, Satoshi SUYAMA, Hiroshi SUZUKI, Kazuhiko FUKAWA, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | This report proposes a scattered-pilot (SP) OFDM reception method employing adaptive tap selection by both SPs and soft decision information from a decoder and soft decision directed channel estimation (SDCE) with the selected taps. In fast fading environments where delay time of a propagation path is as long as the guard interval, the conventional channel estimation method using SPs of some symbols cannot achieve sufficient accuracy of the estimation because of the tradeoff between the tracking performance and the accuracy of the estimation. To solve this problem, the proposed method performs iterative detection and channel estimation by using the log-likelihood ratio (LLR) of the coded bits from the decoder. The initial channel estimation smoothens the channel impulse response which the least square method estimates by using SPs of neighboring symbols. The channel estimation in the iterative processing adaptively extracts only dominant paths by LLR and SPs, and it conducts SDCE by the LMS algorithm which selects and updates only the taps corresponding to the extracted paths. To verify the effectiveness of the method, computer simulations in the SP-OFDM signal formats following the integrated services digital broadcasting-terrestrial (ISDB-T) demonstrate that the iterative processing of the tap selection, SDCE, the coherent detection, and MAP decoding can achieve the excellent tracking performance and improve the accuracy of the estimation even in the case of the OFDM transmission with a large number of estimated parameters. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Mobile communication / OFDM / scattered-pilot / decision-directed channel estimation / tap selection |
| Paper # | RCS2006-76 |
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| Conference Information | |
| Committee | RCS |
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| Conference Date | 2006/7/12(1days) |
| Place (in Japanese) | (See Japanese page) |
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| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Radio Communication Systems (RCS) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Iterative Detection and Channel Estimation Employing Adaptive Tap Selection for Scattered Pilot OFDM Receiver |
| Sub Title (in English) | |
| Keyword(1) | Mobile communication |
| Keyword(2) | OFDM |
| Keyword(3) | scattered-pilot |
| Keyword(4) | decision-directed channel estimation |
| Keyword(5) | tap selection |
| 1st Author's Name | Katsuya KATO |
| 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 | Hiroshi SUZUKI |
| 3rd Author's Affiliation | Tokyo Institute of Technology |
| 4th Author's Name | Kazuhiko FUKAWA |
| 4th Author's Affiliation | Tokyo Institute of Technology |
| Date | 2006-07-20 |
| Paper # | RCS2006-76 |
| Volume (vol) | vol.106 |
| Number (no) | 168 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |