| Presentation | 2017-06-22 Beam Forming Schemes on Wireless Entrance Systems for Street Small Cells Kazuto Goto, Takahiro Tsuchiya, Mizuki Suga, Atsushi Ohta, Masataka Iizuka, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Toward the 5th Generation Mobile Communications (5G), by using massive MIMO, small cell constructing technologies for offloading traffic in areas where users are densely have been studied. We have studied to make entrance link to small cell base-stations wireless, aiming at the rapid deployment of 5G small cells. On the systems, both of entrance base-stations (EBSs) and relay-stations (RSs) are fixedly installed at high location and it is expected that the direct wave is dominant on the environment. For massive MIMO technologies in such environment, we have proposed 1-tap time-domain beamforming (TDBF) and digital assisted analog beamforming (DAABF). TDBF achieves simplified control. DAABF is useful for low cost implementation by reducing required number of analog digital convertors (ADCs) and digital analog convertors (DACs). In order to confirm the feasibility of the proposed schemes on real environment, we have performed propagation measurement on outdoor and indoor environment at 75GHz band, and collected many sets of channel state information (CSI) on massive antenna systems. In this paper, we show the evaluation results and their effectiveness. In case employing 20 x 10 = 200 antenna elements with about 1.3 wavelength spacing, the proposed schemes can form highly accurate directional beams like maximal ratio combining (MRC) on frequency-domain. Moreover, in case implementing over 6-8 spatial multiplexing, since orthogonalization loss was quite small, we clarified that efficient spatial multiplexing can be realized. |
| Keyword(in Japanese) | (See Japanese page) |
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| Paper # | RCS2017-75 |
| Date of Issue | 2017-06-14 (RCS) |
| Conference Information | |
| Committee | RCS |
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| Conference Date | 2017/6/21(3days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Ishigaki Shoukou Kaikan |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | First Presentation in IEICE Technical Committee, Railroad Communications, Inter-Vehicle Communications, Road to Vehicle Communications, Resource Control, Scheduling, Wireless Communication Systems, etc. |
| Chair | Tomoaki Otsuki(Keio Univ.) |
| Vice Chair | Eisuke Fukuda(Fujitsu Labs.) / Satoshi Suyama(NTT DoCoMo) / Fumiaki Maehara(Waseda Univ.) |
| Secretary | Eisuke Fukuda(Hokkaido Univ.) / Satoshi Suyama(NTT) / Fumiaki Maehara |
| Assistant | Kazushi Muraoka(NTT DOCOMO) / Shinsuke Ibi(Osaka Univ.) / Hiroshi Nishimoto(Mitsubishi Electric) / Koichi Adachi(Univ. of Electro-Comm.) / Osamu Nakamura(Sharp) |
| Paper Information | |
| Registration To | Technical Committee on Radio Communication Systems |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Beam Forming Schemes on Wireless Entrance Systems for Street Small Cells |
| Sub Title (in English) | Performance Evaluation with 75GHz Outdoor/Indoor Propagation Measurement |
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| 1st Author's Name | Kazuto Goto |
| 1st Author's Affiliation | Nippon Telegraph and Telephone Corporation(NTT) |
| 2nd Author's Name | Takahiro Tsuchiya |
| 2nd Author's Affiliation | Nippon Telegraph and Telephone Corporation(NTT) |
| 3rd Author's Name | Mizuki Suga |
| 3rd Author's Affiliation | Nippon Telegraph and Telephone Corporation(NTT) |
| 4th Author's Name | Atsushi Ohta |
| 4th Author's Affiliation | Nippon Telegraph and Telephone Corporation(NTT) |
| 5th Author's Name | Masataka Iizuka |
| 5th Author's Affiliation | Nippon Telegraph and Telephone Corporation(NTT) |
| Date | 2017-06-22 |
| Paper # | RCS2017-75 |
| Volume (vol) | vol.117 |
| Number (no) | RCS-103 |
| Page | pp.pp.149-154(RCS), |
| #Pages | 6 |
| Date of Issue | 2017-06-14 (RCS) |