| Presentation | 2012-03-08 Complexity Reducing QRD-MLD with Threshold Method based on the Estimated Noise Variance Tomoki YOSHIMURA, Yuta IDA, Chang-Jun AHN, Tatsuya OMORI, Ken-ya HASHIMOTO, |
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| Abstract(in Japanese) | (See Japanese page) | |
| Abstract(in English) | In MIMO systems, maximum likelihood decoding (MLD) shows the best performance of all kinds of detection. However, the complexity of MLD exponentially increases with the number of antenna branches and the constellation size. Accordingly, it is impracticed to use a full MLD without reducing its computational complexity, because it would be prohibitively large to implement. Recently, the use of QR decomposition with an M-argorithm(QRM-MLD) has been proposed to reduce the system complexity while maintaining the performance of the system. However, QRM-MLD performance depends on the surviving symbol replica candidates. To reduce this problem, in this paper, we propose the complexity reducing QRD-MLD with threshold method using the estimated noise variance. The proposed algorithm with the ranking of all branch metrics shows the superior performance while maintaining the low complexity. From the simulation results, the proposed method achieves 1/10 complexity reduction compared with full MLD for the threshold index k_ | =3.5. |
| Keyword(in Japanese) | (See Japanese page) | |
| Keyword(in English) | MIMO-OFDM / MLD / QR decomposition | |
| Paper # | CAS2011-123,SIP2011-143,CS2011-115 | |
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| Committee | CAS |
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| Conference Date | 2012/3/1(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 | Circuits and Systems (CAS) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Complexity Reducing QRD-MLD with Threshold Method based on the Estimated Noise Variance |
| Sub Title (in English) | |
| Keyword(1) | MIMO-OFDM |
| Keyword(2) | MLD |
| Keyword(3) | QR decomposition |
| 1st Author's Name | Tomoki YOSHIMURA |
| 1st Author's Affiliation | Faculty of Engineering, Chiba University() |
| 2nd Author's Name | Yuta IDA |
| 2nd Author's Affiliation | Faculty of Information science, Hiroshima City University |
| 3rd Author's Name | Chang-Jun AHN |
| 3rd Author's Affiliation | Faculty of Engineering, Chiba University |
| 4th Author's Name | Tatsuya OMORI |
| 4th Author's Affiliation | Faculty of Engineering, Chiba University |
| 5th Author's Name | Ken-ya HASHIMOTO |
| 5th Author's Affiliation | Faculty of Engineering, Chiba University |
| Date | 2012-03-08 |
| Paper # | CAS2011-123,SIP2011-143,CS2011-115 |
| Volume (vol) | vol.111 |
| Number (no) | 465 |
| Page | pp.pp.- |
| #Pages | 4 |
| Date of Issue | |