| Presentation | 2015-01-22 A throughput evaluation of an over-distributed antenna system with signal distributing or switching under control delay Yuki NAKANISHI, Toshihiko NISHIMURA, Takeo OHGANE, Yasutaka OGAWA, Yusuke OHWATARI, Yoshihisa KISHIYAMA, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | When a base station has many transmit antennas such as a massive MIMO system, we need as many pilot resources as the transmit antennas to estimate channel state information (CSI) and its feedback in an FDD system, and thus transmission efficiency degrades. In our previous study, we have proposed an over-distributed antenna system (O-DAS) with much more transmit antennas than limited pilot resources, and have shown an improvement of the peak throughput under a perfect CSI assumption. However, the CSI is outdated if control delay exists, and thus it may cause the inter-user-interference which seriously degrades the transmission performance. In this paper, we evaluate the throughput performance of the O-DAS for two transmission methods, namely, signal distributing and switching, in time-varying environments with a control delay. Compared with the case in non time-varying environments, it is shown that the performance degradation of signal switching is not serious and that the signal distributing still provides sufficient gain although the profitable range becomes narrow. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | distributed antenna system / multiuser MIMO / throughput / pilot sequence |
| Paper # | SIP2014-91,RCS2014-279 |
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| Committee | SIP |
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| Conference Date | 2015/1/15(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Registration To | Signal Processing (SIP) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | A throughput evaluation of an over-distributed antenna system with signal distributing or switching under control delay |
| Sub Title (in English) | |
| Keyword(1) | distributed antenna system |
| Keyword(2) | multiuser MIMO |
| Keyword(3) | throughput |
| Keyword(4) | pilot sequence |
| 1st Author's Name | Yuki NAKANISHI |
| 1st Author's Affiliation | Graduate School of Information Science and Technology, Hokkaido University() |
| 2nd Author's Name | Toshihiko NISHIMURA |
| 2nd Author's Affiliation | Graduate School of Information Science and Technology, Hokkaido University |
| 3rd Author's Name | Takeo OHGANE |
| 3rd Author's Affiliation | Graduate School of Information Science and Technology, Hokkaido University |
| 4th Author's Name | Yasutaka OGAWA |
| 4th Author's Affiliation | Graduate School of Information Science and Technology, Hokkaido University |
| 5th Author's Name | Yusuke OHWATARI |
| 5th Author's Affiliation | NTT DOCOMO, INC. |
| 6th Author's Name | Yoshihisa KISHIYAMA |
| 6th Author's Affiliation | NTT DOCOMO, INC. |
| Date | 2015-01-22 |
| Paper # | SIP2014-91,RCS2014-279 |
| Volume (vol) | vol.114 |
| Number (no) | 394 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |