| Presentation | 2006/10/12 New Robust Beamforming Method for Frequency Offsets in Uplink Multiuser OFDM-MIMO Yasushi Takatori, Riichi Kudo, Atsushi Ohta, Kentaro Nishimori, Shuji Kubota, |
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| PDF Download Page | PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Recently multiuser multiple input multiple output (MU-MIMO) systems have attracted attention as frequency efficient systems. However, in uplink MU-MIMO systems, different frequency offsets among multiple mobile stations (MSs) significantly degrade the transmission quality especially when orthogonal frequency division multiplexing (OFDM) is used. In this paper, the influence of the frequency offset is first analyzed in a frequency selective fading environment. Numerical analysis shows that an error floor occurs in the bit error rate and the influence of the frequency offset becomes larger in a short delay spread environment. To overcome this problem, a new beamforming method is proposed to compensate for the frequency offset by introducing an auto frequency controller after the frequency-space equalization in each data stream. The effect of the proposed method is evaluated in a frequency selective fading environment by computer simulation. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Multiuser MIMO / OFDM / frequency offset / uplink |
| Paper # | A・P2006-88 |
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| Conference Information | |
| Committee | AP |
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| Conference Date | 2006/10/12(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Chair | |
| Vice Chair | |
| Secretary | |
| Assistant | |
| 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) | New Robust Beamforming Method for Frequency Offsets in Uplink Multiuser OFDM-MIMO |
| Sub Title (in English) | |
| Keyword(1) | Multiuser MIMO |
| Keyword(2) | OFDM |
| Keyword(3) | frequency offset |
| Keyword(4) | uplink |
| 1st Author's Name | Yasushi Takatori |
| 1st Author's Affiliation | NTT Network Innovation Laboratories() |
| 2nd Author's Name | Riichi Kudo |
| 2nd Author's Affiliation | NTT Network Innovation Laboratories |
| 3rd Author's Name | Atsushi Ohta |
| 3rd Author's Affiliation | NTT Network Innovation Laboratories |
| 4th Author's Name | Kentaro Nishimori |
| 4th Author's Affiliation | NTT Network Innovation Laboratories |
| 5th Author's Name | Shuji Kubota |
| 5th Author's Affiliation | NTT Network Innovation Laboratories |
| Date | 2006/10/12 |
| Paper # | A・P2006-88 |
| Volume (vol) | vol.106 |
| Number (no) | 302 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |