| Presentation | 2010-11-11 Orthogonal Beamforming Using Gram-Schmidt Orthogonalization for Multi-User MIMO Downlink System Kunitaka MATSUMURA, Tomoaki OHTSUKI, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Simultaneous transmission to multiple users using orthogonal beamforming, known as space-division multiple-access (SDMA), is capable of achieving very high throughput in multiple-input multiple-output (MIMO) broadcast channel. In this report, we propose a new orthogonal beamforming algorithm to achieve high capacity performance in MIMO broadcast channel. In the proposed algorithm, the base station generates a unitary beamforming vector set using Gram-Schmidt orthogonalization. We extend the algorithm of LF-OSDMA (opportunistic SDMA with limited feedback) to guarantee that the system never lose multiplexing gain for fair comparison with the proposed method by informing unallocated beams. Finally, we compare the sum capacity of the proposed method to that of LF-OSDMA and expanded LF-OSDMA while taking into account the amount of feedback bits and latency. We show that our method can achieve a significantly high sum capacity without a large increase in the amount of feedback bits and latency. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | MIMO system / Beamforming / Multi-user MIMO / SDMA / Gram-Schmidt orthogonalization |
| Paper # | RCS2010-145 |
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| Committee | RCS |
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| Conference Date | 2010/11/4(1days) |
| Place (in Japanese) | (See Japanese page) |
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| Topics (in Japanese) | (See Japanese page) |
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| Registration To | Radio Communication Systems (RCS) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Orthogonal Beamforming Using Gram-Schmidt Orthogonalization for Multi-User MIMO Downlink System |
| Sub Title (in English) | |
| Keyword(1) | MIMO system |
| Keyword(2) | Beamforming |
| Keyword(3) | Multi-user MIMO |
| Keyword(4) | SDMA |
| Keyword(5) | Gram-Schmidt orthogonalization |
| 1st Author's Name | Kunitaka MATSUMURA |
| 1st Author's Affiliation | Department of Information and Computer Science, Keio University() |
| 2nd Author's Name | Tomoaki OHTSUKI |
| 2nd Author's Affiliation | Department of Information and Computer Science, Keio University |
| Date | 2010-11-11 |
| Paper # | RCS2010-145 |
| Volume (vol) | vol.110 |
| Number (no) | 268 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |