| Presentation | 2008-05-30 LDPC Coded Hybrid ARQ Scheme with Reduced Feedback Information Tomonori SAITO, Tomoaki OHTSUKI, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | The reliability-based hybrid ARQ (RB-HARQ) scheme, which can be used with error correcting codes using soft-input soft-output (SISO) decoders such as convolutional codes and turbo codes, has been proposed. In the RB-HARQ scheme, the error rate performance is improved by selecting retransmission bits based on log likelihood ratio (LLR) of each bit in the receiver. However, the receiver has to send the bit positions of retransmission bits to the transmitter. Thus, the conventional RB-HARQ scheme requires a large number of feedback bits. In this report we first show that when low-density parity-check (LDPC) decoding fails, the error bits are scattered in a block. Based on this fact, we propose the LDPC coded Hybrid ARQ scheme with reduced feedback information. The proposed scheme specifies the retransmission bits by each subblock so that it can significantly reduce the number of feedback bits, while the conventional RB-HARQ scheme specifies the retransmission bits from the whole packet. We show that the proposed scheme reduces the number of feedback bits than that of the conventional RB-HARQ scheme. We also show that the proposed scheme achieves higher throughput than the conventional RB-HARQ scheme at the same number of feedback bits. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | HARQ / Feedback information / LDPC codes / Sub-block / RB-HARQ |
| Paper # | RCS2008-14 |
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| Conference Information | |
| Committee | RCS |
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| Conference Date | 2008/5/22(1days) |
| Place (in Japanese) | (See Japanese page) |
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| Topics (in Japanese) | (See Japanese page) |
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| Registration To | Radio Communication Systems (RCS) |
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| Language | ENG |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | LDPC Coded Hybrid ARQ Scheme with Reduced Feedback Information |
| Sub Title (in English) | |
| Keyword(1) | HARQ |
| Keyword(2) | Feedback information |
| Keyword(3) | LDPC codes |
| Keyword(4) | Sub-block |
| Keyword(5) | RB-HARQ |
| 1st Author's Name | Tomonori SAITO |
| 1st Author's Affiliation | Graduate School of Science and Technology, Tokyo University of Science() |
| 2nd Author's Name | Tomoaki OHTSUKI |
| 2nd Author's Affiliation | Faculty School of Science and Technology, Keio University |
| Date | 2008-05-30 |
| Paper # | RCS2008-14 |
| Volume (vol) | vol.108 |
| Number (no) | 61 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |