| Presentation | 2021-10-21 A New Beam Search Based on Combination History of Selected Beams among Antennas for Distributed Antenna System Shuki Wai, Tatsuhiko Iwakuni, Takuto Arai, Daisei Uchida, Naoki Kita, |
|---|---|
| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Distributed antenna system using high-frequency bands such as millimeter-wave and sub-terahertz is expected to be one of promising method to increase remarkably the capacity of future wireless communications. Because the high-frequency bands system can provide a wider bandwidth than the conventional wireless communications and the distributed antenna system improves the spatial multiplexing transmission performance by reducing spatial correlations of the MIMO(Multi-Input Multi-Output) channel in LoS(Line-of-Sight) environments. However, the overhead of beam searching for antennas beamforming in the system is larger than the conventional wireless communications, because the beamwidth of antennas are needed to be narrower to compensate large propagation attenuation of the high frequency bands and the beams searching are needed to be operated for all of the distributed antennas. In this paper, in order to solve the problem, we propose a newly beam searching method to limit the directions of beams sweep based on the combinations of beams selected among the distributed antennas in the past. We show that the proposed method can reduce the number of beam searching by about 74.1% maintaining the same transmission capacity performances, as compared with the conventional full-beam searching by computer simulation. In addition, for efficient operation of the proposed method, the authors propose a method interpolating beam combination histories to reduce the number of beam combination histories required to maintain the transmission capacity, and show that the number of the beam combination histories required that can be reduced by about 79.6%. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Beam Search / millimeter-wave / Terahertz-wave / Distributed antenna |
| Paper # | RCS2021-123 |
| Date of Issue | 2021-10-14 (RCS) |
| Conference Information | |
| Committee | RCS |
|---|---|
| Conference Date | 2021/10/21(2days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Online |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Wireless Communication Schemes, Wireless Communication Systems, Wireless Standards, Future Wireless Systems, etc. |
| Chair | Eiji Okamoto(Nagoya Inst. of Tech.) |
| Vice Chair | Toshihiko Nishimura(Hokkaido Univ.) / Tomoya Tandai(Toshiba) / Fumihide Kojima(NICT) |
| Secretary | Toshihiko Nishimura(NEC) / Tomoya Tandai(Panasonic) / Fumihide Kojima |
| Assistant | Koichi Adachi(Univ. of Electro-Comm.) / Osamu Nakamura(Sharp) / Manabu Sakai(Mitsubishi Electric) / Masashi Iwabuchi(NTT) / Tatsuki Okuyama(NTT DOCOMO) |
| Paper Information | |
| Registration To | Technical Committee on Radio Communication Systems |
|---|---|
| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | A New Beam Search Based on Combination History of Selected Beams among Antennas for Distributed Antenna System |
| Sub Title (in English) | |
| Keyword(1) | Beam Search |
| Keyword(2) | millimeter-wave |
| Keyword(3) | Terahertz-wave |
| Keyword(4) | Distributed antenna |
| 1st Author's Name | Shuki Wai |
| 1st Author's Affiliation | Nippon Telegraph and Telephone Corporation(NTT) |
| 2nd Author's Name | Tatsuhiko Iwakuni |
| 2nd Author's Affiliation | Nippon Telegraph and Telephone Corporation(NTT) |
| 3rd Author's Name | Takuto Arai |
| 3rd Author's Affiliation | Nippon Telegraph and Telephone Corporation(NTT) |
| 4th Author's Name | Daisei Uchida |
| 4th Author's Affiliation | Nippon Telegraph and Telephone Corporation(NTT) |
| 5th Author's Name | Naoki Kita |
| 5th Author's Affiliation | Nippon Telegraph and Telephone Corporation(NTT) |
| Date | 2021-10-21 |
| Paper # | RCS2021-123 |
| Volume (vol) | vol.121 |
| Number (no) | RCS-210 |
| Page | pp.pp.31-36(RCS), |
| #Pages | 6 |
| Date of Issue | 2021-10-14 (RCS) |