| Presentation | 2004/10/23 Independent Adaptive Control of Surviving Symbol Replica Candidates at Each Stage Based on Minimum Branch Metric in QRM-MLD for VSF-Spread OFDM MIMO Multiplexing Hiroyuki Kawai, Kenichi Higuchi, Noriyuki Maeda, Mamoru Sawahashi, |
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| PDF Download Page | PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | This paper proposes independent adaptive control of the number of surviving symbol replica candidates, S_m (m denotes the stage index), to calculate branch metrics, i.e., squared Euclidian distances, at each stage based on the minimum accumulated branch metric of each stage in Maximum Likelihood Detection applying QR decomposition and the M-algorithm (QRM-MLD hereafter) for Variable Spreading Factor (VSF)-Spread Orthogonal Frequency Division Multiplexing (OFDM) MIMO multiplexing. In the proposed algorithm, the number of surviving symbol replica candidates at the m-th stage (1 ≤ m ≤ N_1, N_1 is number of transmission antenna branches), S_m, is independently controlled using the threshold value calculated from the minimum accumulated branch metric at the stage and estimated noise power. Computer simulation results show that the average number of multiplications per frame for signal separation as the computational complexity for the proposed adaptive independent S_m control method is decreased to approximately 38% that of the adaptive common S_m control and to approximately 30% that of the fixed S_m method for all stages, assuming for all control methods the identical achievable avenge packet error rate (PER) performance at the information bit rate of 1.048 Gbps by 16QAM modulation and Turbo coding with the coding rate of 8/9 in 4-by-4 MIMO multiplexing with a 100-MHz bandwidth (a twelve-path Rayleigh fading channel, root mean squared (r.m.s.) delay spread of 0.26 μsec, maximum Doppler frequency of 20 Hz). |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | VSF-Spread OFDM / Multiple-Input Multiple-Output / Maximum likelihood detection / QR decomposition / M-algorithm |
| Paper # | A・P2004-186,RCS2004-207 |
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| Conference Information | |
| Committee | AP |
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| Conference Date | 2004/10/23(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Antennas and Propagation (A・P) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Independent Adaptive Control of Surviving Symbol Replica Candidates at Each Stage Based on Minimum Branch Metric in QRM-MLD for VSF-Spread OFDM MIMO Multiplexing |
| Sub Title (in English) | |
| Keyword(1) | VSF-Spread OFDM |
| Keyword(2) | Multiple-Input Multiple-Output |
| Keyword(3) | Maximum likelihood detection |
| Keyword(4) | QR decomposition |
| Keyword(5) | M-algorithm |
| 1st Author's Name | Hiroyuki Kawai |
| 1st Author's Affiliation | IP Radio Network Development Department, NTT DoCoMo, Inc.() |
| 2nd Author's Name | Kenichi Higuchi |
| 2nd Author's Affiliation | IP Radio Network Development Department, NTT DoCoMo, Inc. |
| 3rd Author's Name | Noriyuki Maeda |
| 3rd Author's Affiliation | IP Radio Network Development Department, NTT DoCoMo, Inc. |
| 4th Author's Name | Mamoru Sawahashi |
| 4th Author's Affiliation | IP Radio Network Development Department, NTT DoCoMo, Inc. |
| Date | 2004/10/23 |
| Paper # | A・P2004-186,RCS2004-207 |
| Volume (vol) | vol.104 |
| Number (no) | 397 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |