| Presentation | 2010/10/7 User Number Selection for Multiuser MIMO Systems Riichi Kudo, Tomoki Murakami, Masato Mizoguchi, Yasushi Takatori, Masahiro Morikura, |
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| PDF Download Page | PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Multiuser (MU) - multiple input multiple output (MIMO) techniques are attractive since they allow a small number of antennas at user stations (STAs) to increase the downlink spectrum efficiency. Although MU-MIMO requires accurate channel state information (CSI) at the transmitter, CSI at the transmitter (CSIT) suffers from estimation errors in practical systems because of quantization error, time varying channels, and the distance between the access point (AP) and STA. The CSIT error causes inter user interference (IUI), which degrades the transmission performance in MU-MIMO. We propose a power allocation scheme that overcomes the transmission performance deterioration due to the imperfect CSIT. The scheme identifies the primary STA and then calculates the ratio of the transmission power for the primary STA and that of the other STAs based on CSIT error information. The scheme reduces the transmission performance degradation in the STA with large CSIT error while increasing the sum rate compared to single user MIMO (SU-MIMO) systems. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Overlapping cell / MIMO / spatial resource allocation / Zero forcing / actual propagation environment |
| Paper # | A・P2010-75 |
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| Conference Information | |
| Committee | AP |
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| Conference Date | 2010/10/7(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) | User Number Selection for Multiuser MIMO Systems |
| Sub Title (in English) | |
| Keyword(1) | Overlapping cell |
| Keyword(2) | MIMO |
| Keyword(3) | spatial resource allocation |
| Keyword(4) | Zero forcing |
| Keyword(5) | actual propagation environment |
| 1st Author's Name | Riichi Kudo |
| 1st Author's Affiliation | NTT Network Innovation Systems Laboratory, NTT() |
| 2nd Author's Name | Tomoki Murakami |
| 2nd Author's Affiliation | NTT Network Innovation Systems Laboratory, NTT |
| 3rd Author's Name | Masato Mizoguchi |
| 3rd Author's Affiliation | NTT Network Innovation Systems Laboratory, NTT |
| 4th Author's Name | Yasushi Takatori |
| 4th Author's Affiliation | Graduate School ofInformatics, Kyoto University |
| 5th Author's Name | Masahiro Morikura |
| 5th Author's Affiliation | NTT Network Innovation Systems Laboratory, NTT |
| Date | 2010/10/7 |
| Paper # | A・P2010-75 |
| Volume (vol) | vol.110 |
| Number (no) | 223 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |