| Presentation | 2009-11-26 Initial LLR Setting for Belief Propagation Decoding in Relay System Naohiro TSUJI, Tomoaki OHTSUKI, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Relay transmission can enhance a communication reliability, increase a transmission rate and save power at a sending station in wireless networks. The scenario under consideration is a simple relay system that sending station sends coded data to a receiving station through a relay station. The relay station makes hard decision and transmits it, termed denoise-and-forward (DNF). The receiving station decodes the error-correcting-coded bits using log-likelihood ratio (LLR). Here, it is important to set initial LLR to decode the coded data accurately at the receiving station. In this report, we present how to set initial LLR for belief propagation decoding in the relay system to achieve better decoding error rate performances. We calculate initial LLR based not only on the channel from the relay station to the receiving station, but also on the channel from the sending station to the relay station when the station decodes error-correcting coded data. When we use turbo code or low-density parity-check (LDPC) code as error-correcting code, we decode the coded data accurately by the use of accurate initial LLR. We provide computer simulation results both with perfect and imperfect channel state information. We show that the proposed method improves error rate performance and decreases the number of decoding iterations. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | relay system / initial LLR / belief propagation decoding / low-density parity-check codes / wireless communication |
| Paper # | RCS2009-135 |
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| Committee | RCS |
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| Conference Date | 2009/11/19(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) | Initial LLR Setting for Belief Propagation Decoding in Relay System |
| Sub Title (in English) | |
| Keyword(1) | relay system |
| Keyword(2) | initial LLR |
| Keyword(3) | belief propagation decoding |
| Keyword(4) | low-density parity-check codes |
| Keyword(5) | wireless communication |
| 1st Author's Name | Naohiro TSUJI |
| 1st Author's Affiliation | Graduate School of Science and Technology, Keio University() |
| 2nd Author's Name | Tomoaki OHTSUKI |
| 2nd Author's Affiliation | Department of Information and Computer science, Keio University |
| Date | 2009-11-26 |
| Paper # | RCS2009-135 |
| Volume (vol) | vol.109 |
| Number (no) | 305 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |