| Presentation | 2007-01-25 Adaptive-Modulation-and-Coding OFDM Radio Packet Systems Employing Bit LLR Combining ARQ with Multiuser Detection Riichiro NAGAREDA, Kazuhiko FUKAWA, Hiroshi SUZUKI, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | This report proposes an OFDM mobile radio packet system that employs a new protocol of automatic repeat request (ARQ) for nonlinear multiuser detection (MUD) with log likelihood ratio (LLR) combining on respective bits. The conventional metric combining MUD (MC-MUD) separates collided packets by using nonlinear MUD, accumulates the squared Euclidian distance metrics of the received subcarrier symbols in the packets, and then achieves throughput improvement. However, when MC-MUD detects a packet error, it makes user terminals retransmit the same packets so as to reproduce the collision of the same packets. The proposed LLR combining MUD (LC-MUD) scheme simplifies the ARQ protocol and requires no reproduction of the same packet collision. The computer simulations demonstrate the superior throughput of LC-MUD to that of MC-MUD, and further improvement due to adaptive modulation and coding (AMC) optimized for the nonlinear MUD in LC-MUD. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | OFDM / mobile radio packet / multiuser detection / ARQ / metric combining / LLR / adaptive modulation and coding |
| Paper # | SIP2006-145,RCS2006-203 |
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| Conference Information | |
| Committee | RCS |
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| Conference Date | 2007/1/18(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| 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) | Adaptive-Modulation-and-Coding OFDM Radio Packet Systems Employing Bit LLR Combining ARQ with Multiuser Detection |
| Sub Title (in English) | |
| Keyword(1) | OFDM |
| Keyword(2) | mobile radio packet |
| Keyword(3) | multiuser detection |
| Keyword(4) | ARQ |
| Keyword(5) | metric combining |
| Keyword(6) | LLR |
| Keyword(7) | adaptive modulation and coding |
| 1st Author's Name | Riichiro NAGAREDA |
| 1st Author's Affiliation | Graduate School of Science and Engineering, Tokyo Institute of Technology() |
| 2nd Author's Name | Kazuhiko FUKAWA |
| 2nd Author's Affiliation | Graduate School of Science and Engineering, Tokyo Institute of Technology |
| 3rd Author's Name | Hiroshi SUZUKI |
| 3rd Author's Affiliation | Graduate School of Science and Engineering, Tokyo Institute of Technology |
| Date | 2007-01-25 |
| Paper # | SIP2006-145,RCS2006-203 |
| Volume (vol) | vol.106 |
| Number (no) | 479 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |