| Presentation | 2015-03-06 Iterative Reception Employing Sparse Channel Estimation for OFDM Systems Yuta TAKAHASHI, Kazuhiko FUKAWA, Hiroshi SUZUKI, Yuyuan CHANG, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | OFDM transmission schemes are adopted for the integrated services digital broadcasting-terrestrial (ISDB-T) and the downlink of LTE. Their wireless channels are likely to be frequency selective fading in which absolute values of many propagation paths are negligible, that is sparse channels. In addition, when the receiver moves rapidly, the channel varies fast due to the Doppler effect and the accuracy of channel estimation deteriorates significantly. In order to alleviate its deterioration, the iterative channel estimation scheme with the tap selection and the LMS algorithm exploiting the log-likelihood ratio (LLR) of the coded bits from the decoder has been studied. For further improvement of the channel esimation accuracy, this report investigates a channel estimaion scheme employing the optimization method with l_1 norm regularization, called a Fast Iterative Shrinkage-Thresholding Algorithm (FISTA), and proposes the iterative reception for OFDM systems employing such a channel estimation scheme. For both the initial channel estimation using scattered-pilots (SPs) of several symbols and the soft decision directed channel estimaion (SDCE) using replicas of transmitted signals, the proposed method to apply FISTA can estimate the sparse channel more precisely than the least squares method. For evaluating the performance of the proposed method, computer simulations following ISDB-T with SP-OFDM are conducted. It is shown that the proposed method can estimate the sparse channel impulse response much more accurately than the conventional method. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Mobile communication / scattered-pilot OFDM / decision-directed channel estimation / l_1 regularization / sparse channel estimation |
| Paper # | RCS2014-372 |
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| Conference Information | |
| Committee | RCS |
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| Conference Date | 2015/2/25(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 Reception Employing Sparse Channel Estimation for OFDM Systems |
| Sub Title (in English) | |
| Keyword(1) | Mobile communication |
| Keyword(2) | scattered-pilot OFDM |
| Keyword(3) | decision-directed channel estimation |
| Keyword(4) | l_1 regularization |
| Keyword(5) | sparse channel estimation |
| 1st Author's Name | Yuta TAKAHASHI |
| 1st Author's Affiliation | Tokyo Institute of Technology() |
| 2nd Author's Name | Kazuhiko FUKAWA |
| 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 | Yuyuan CHANG |
| 4th Author's Affiliation | Tokyo Institute of Technology |
| Date | 2015-03-06 |
| Paper # | RCS2014-372 |
| Volume (vol) | vol.114 |
| Number (no) | 490 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |