| Presentation | 2012-08-31 Performance of Iterative Decision-Directed Chanel Estimation Using LDPC Code for DFT-Precoded OFDMA Yoshikazu Tanaka, Nobuhiko Miki, Teruo Kawamura, Mamoru Sawahashi, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | This paper presents the average block error rate (BLER) performance of iterative decision-directed channel estimation (DDCE) using the Low-Density Parity-Check (LDPC) code for discrete Fourier transform (DFT)-precoded Orthogonal Frequency Division Multiple Access (OFDMA). We apply iterative DDCE using soft-decision symbol estimation based on the log-likelihood ratio (LLR) of an extrinsic probability at the Layered Belief Propagation (BP) decoder output in addition to reference signals (RSs). The improved channel response is used to generate a linear minimum mean-square error (LMMSE) based weight in the frequency domain equalizer (FDE) and to compute the LLR of a posteriori probability at the FDE output. Computer simulation results show that the iterative DDCE with the number of iterations of 2 for the coding rate of R = 1/3 and 1/2 can decrease the required average received signal-to-noise power ratio (SNR) satisfying the average BLER of 10^<-2> by approximately 0.7 and 0.4 dB compared to that for RS based channel estimation. Consequently, the loss in the required average received SNR compared to the ideal channel estimation is suppressed to within 0.4 dB in the 9-path Extended Typical Urban channel model. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Mobile communications / single-carrier FDMA / LDPC code / channel estimation / DFT-precoded OFDMA |
| Paper # | RCS2012-116 |
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| Committee | RCS |
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| Conference Date | 2012/8/23(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) | Performance of Iterative Decision-Directed Chanel Estimation Using LDPC Code for DFT-Precoded OFDMA |
| Sub Title (in English) | |
| Keyword(1) | Mobile communications |
| Keyword(2) | single-carrier FDMA |
| Keyword(3) | LDPC code |
| Keyword(4) | channel estimation |
| Keyword(5) | DFT-precoded OFDMA |
| 1st Author's Name | Yoshikazu Tanaka |
| 1st Author's Affiliation | Department of Information Network Engineering, Tokyo City University() |
| 2nd Author's Name | Nobuhiko Miki |
| 2nd Author's Affiliation | Intellectual Property Department, NTT DOCOMO, INC. |
| 3rd Author's Name | Teruo Kawamura |
| 3rd Author's Affiliation | Radio Access Development Department, NTT DOCOMO, INC. |
| 4th Author's Name | Mamoru Sawahashi |
| 4th Author's Affiliation | Department of Information Network Engineering, Tokyo City University |
| Date | 2012-08-31 |
| Paper # | RCS2012-116 |
| Volume (vol) | vol.112 |
| Number (no) | 192 |
| Page | pp.pp.- |
| #Pages | 6 |
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