| Presentation | 2008-12-18 Complexity Reduced MLD Based on QR Decomposition in OFDM MIMO Multiplexing with Frequency Domain Spreading and Code Multiplexing Kouji NAGATOMI, Kenichi HIGUCHI, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | This paper presents a symbol ordering method for the proposed maximum likelihood detection (MLD) for orthogonal frequency division multiplexing (OFDM) multiple input multiple output (MIMO) multiplexing with the frequency domain spreading and code multiplexing, which reduces the computational complexity by utilizing the signal orthogonalization based on the QR decomposition of the product of the channel and spreading code matrices. We propose a spreading code-first ordering method for compensating the symbol selection error in M-algorithm due to the fading correlation between the code-multiplexed symbols transmitted from the same transmit antenna. We show that the proposed spreading code-first ordering method can achieve better packet error rate (PER) than the transmit antenna-first ordering. When the spreading factor is 16, the proposed MLD can reduce the received signal energy per bit-to-noise spectrum density ratio (E_b/N_0) for the average PER of 10^<-2> by approximately 12dB comparing to the conventional minimum mean squared error (MMSE)-based filtering for 4-by-4 MIMO multiplexing, respectively (16QAM with rate-3/4 Turbo code is assumed). |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | OFDM / MIMO / Spreading / Signal detection / Maximum likelihood detection / QR decomposition |
| Paper # | RCS2008-152 |
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| Conference Information | |
| Committee | RCS |
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| Conference Date | 2008/12/11(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) | Complexity Reduced MLD Based on QR Decomposition in OFDM MIMO Multiplexing with Frequency Domain Spreading and Code Multiplexing |
| Sub Title (in English) | |
| Keyword(1) | OFDM |
| Keyword(2) | MIMO |
| Keyword(3) | Spreading |
| Keyword(4) | Signal detection |
| Keyword(5) | Maximum likelihood detection |
| Keyword(6) | QR decomposition |
| 1st Author's Name | Kouji NAGATOMI |
| 1st Author's Affiliation | Department of Electrical Engineering, Graduate School of Science and Technology Tokyo University of Science() |
| 2nd Author's Name | Kenichi HIGUCHI |
| 2nd Author's Affiliation | Department of Electrical Engineering, Graduate School of Science and Technology Tokyo University of Science |
| Date | 2008-12-18 |
| Paper # | RCS2008-152 |
| Volume (vol) | vol.108 |
| Number (no) | 358 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |