| Presentation | 2013-02-01 Investigation on LLR Computation at Decoder Input for Receiver Diversity Using Low-Rate Turbo Code for DFT Precoded OFDMA Keita Miwa, Teruo Kawamura, Nobuhiko Miki, Mamoru Sawahashi, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | This paper investigates log-likelihood ratio (LLR) generation methods at decoder input for antenna receiver diversity using low-rate turbo code for discrete Fourier transform (DFT)-precoded orthogonal frequency division multiple access (OFDMA). First method is to generate LLR by combining the individual computed LLR at each receiver diversity branch (hereafter, LLR computation based on individual LLR combining). Second method is to generate LLR from the diversity-combined signal after frequency domain equalizer (FDE) (hereafter, LLR computation using combined signal after FDE). Computer simulation results show when channel coding rate is equal or smaller than approximately R = 1/5, LLR computation using combined signal after FDE achieves almost same average block error rate (BLER) performance level as that for LLR computation based on individual LLR combining. We show, however, that the required average received signal-to-noise power ratio (SNR) at the average BLER of 10-2 of LLR computation using combined signal after FDE is decreased by approximately 0.5 dB compared to that for LLR computation based on individual LLR combining when R is high such as 3/4. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Single-carrier FDMA / Low-rate turbo code / Log-likelihood ratio / Frequency domain equalizer / Channel / estimation |
| Paper # | SIP2012-114,RCS2012-271 |
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| Conference Information | |
| Committee | SIP |
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| Conference Date | 2013/1/24(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Signal Processing (SIP) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Investigation on LLR Computation at Decoder Input for Receiver Diversity Using Low-Rate Turbo Code for DFT Precoded OFDMA |
| Sub Title (in English) | |
| Keyword(1) | Single-carrier FDMA |
| Keyword(2) | Low-rate turbo code |
| Keyword(3) | Log-likelihood ratio |
| Keyword(4) | Frequency domain equalizer |
| Keyword(5) | Channel |
| Keyword(6) | estimation |
| 1st Author's Name | Keita Miwa |
| 1st Author's Affiliation | Department of Information Network Engineering, Tokyo City University() |
| 2nd Author's Name | Teruo Kawamura |
| 2nd Author's Affiliation | Radio Access Network Development Department, NTT DOCOMO, INC. |
| 3rd Author's Name | Nobuhiko Miki |
| 3rd Author's Affiliation | Intellectual Property Department, NTT DOCOMO, INC. |
| 4th Author's Name | Mamoru Sawahashi |
| 4th Author's Affiliation | Department of Information Network Engineering, Tokyo City University |
| Date | 2013-02-01 |
| Paper # | SIP2012-114,RCS2012-271 |
| Volume (vol) | vol.112 |
| Number (no) | 423 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |