| Presentation | 2018-03-02 Parameter Control Method for Massive MIMO using Hybrid Beamforming Ryutaro Kitajima, Kazuhiko Fukawa, Yuyuan Chang, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | For the next generation mobile communications, hybrid beamforming (HB) that consists of joint analog beamforming (AB) and digital beamforming (DB) has been considered a promising scheme of massive MIMO, because HB can reduce the number of RF circuits drastically. For TDD multiuser MIMO communications, this report proposes a joint estimation scheme of both phases of phase shifters in AB and a precoding matrix used in DB. The proposed estimation scheme consists of the following seven steps: i) Firstly, the channel matrix for full DB is estimated using uplink received signals. ii) Next, an MMSE precoding matrix is obtained from the estimated channel matrix. iii) A difference matrix between the MMSE precoding matrix and the precoding matrix of AB multiplied by that of DB is calculated. The cost function is defined as the squared Frobenius norm of the difference matrix. iv) After the phases in AB are fixed to certain values, the precoding matrix for DB that can minimize the cost function is obtained. v) After the precoding matrix of DB is fixed to such an estimated precoding matrix, the phases in AB that can minimize the cost function are obtained as continuous values. vi) Steps iv) and v) are repeated. vii) After the iteration stops, the optimum phases are quantized. Multiplying the above-mentioned channel matrix by the precoding matrix of AB with the discrete-value phases yields an equivalent channel matrix. Using the equivalent channel matrix, the MMSE precoding matrix for DB is obtained and used as the precoding matrix for DB. Computer simulations under conditions of quasi-static fading channels, four users, and 256-element array antenna on the base station demonstrate that the proposed scheme can achieve downlink BER performance that is a little inferior to BER of full DB. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | 5G / massive MIMO / hybrid beamforming / channel estimation / phase shifter / precoding matrix |
| Paper # | RCS2017-394 |
| Date of Issue | 2018-02-21 (RCS) |
| Conference Information | |
| Committee | RCS / SR / SRW |
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| Conference Date | 2018/2/28(3days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | YRP |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Mobile Communication Workshop |
| Chair | Hidekazu Murata(Kyoto Univ.) / Kenta Umebayashi(Tokyo Univ. of Agric. and Tech.) / Tadao Nakagawa(Tottori Univ.) |
| Vice Chair | Yukitoshi Sanada(Keio Univ.) / Eisuke Fukuda(Fujitsu Labs.) / Satoshi Suyama(NTT DoCoMo) / Masayuki Ariyoshi(NEC) / Suguru Kameda(Tohoku Univ.) / Satoshi Denno(Okayama Univ.) / Makoto Hamaminato(Fujitsu labs.) |
| Secretary | Yukitoshi Sanada(Toshiba) / Eisuke Fukuda(Hokkaido Univ.) / Satoshi Suyama(NICT) / Masayuki Ariyoshi(ATR) / Suguru Kameda(NICT) / Satoshi Denno(Kyoto Univ.) / Makoto Hamaminato |
| Assistant | Tetsuya Yamamoto(Panasonic) / Koichi Ishihara(NTT) / Kazushi Muraoka(NEC) / Shinsuke Ibi(Osaka Univ.) / Hiroshi Nishimoto(Mitsubishi Electric) / Mamiko Inamori(Tokai Univ.) / Hiroyuki Shiba(NTT) / Gia Khanh Tran(Tokyo Inst. of Tech.) / Syusuke Narieda(NIT, Akashi College) / Kentaro Saito(Tokyo Inst. of Tech.) / Hiromasa Yamauchi(Fujitsu labs.) |
| Paper Information | |
| Registration To | Technical Committee on Radio Communication Systems / Technical Committee on Smart Radio / Technical Committee on Short Range Wireless Communications |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Parameter Control Method for Massive MIMO using Hybrid Beamforming |
| Sub Title (in English) | |
| Keyword(1) | 5G |
| Keyword(2) | massive MIMO |
| Keyword(3) | hybrid beamforming |
| Keyword(4) | channel estimation |
| Keyword(5) | phase shifter |
| Keyword(6) | precoding matrix |
| 1st Author's Name | Ryutaro Kitajima |
| 1st Author's Affiliation | Tokyo Institute of Technology(Tokyo Tech) |
| 2nd Author's Name | Kazuhiko Fukawa |
| 2nd Author's Affiliation | Tokyo Institute of Technology(Tokyo Tech) |
| 3rd Author's Name | Yuyuan Chang |
| 3rd Author's Affiliation | Tokyo Institute of Technology(Tokyo Tech) |
| Date | 2018-03-02 |
| Paper # | RCS2017-394 |
| Volume (vol) | vol.117 |
| Number (no) | RCS-456 |
| Page | pp.pp.417-422(RCS), |
| #Pages | 6 |
| Date of Issue | 2018-02-21 (RCS) |