Abstract
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 paper, we propose a new orthogonal beamforming algorithm to achieve high capacity performance in MIMO broadcast channel. In the proposed method, the base station generates a unitary beamforming vector set using Gram-Schmidt orthogonalization. We extend the algorithm of opportunistic SDMA with limited feedback (LF-OSDMA) to guarantee that the system never loses multiplexing gain for fair comparison with the proposed method by informing unallocated beams. We show that the proposed method can achieve a significantly higher sum capacity than LF-OSDMA and the extended LF-OSDMA without a large increase in the amount of feedback bits and latency.
| Original language | English |
|---|---|
| Article number | 41 |
| Journal | Eurasip Journal on Wireless Communications and Networking |
| Volume | 2011 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2011 Dec 1 |
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Keywords
- Gram-Schmidt orthogonalization
- Multi-user MIMO
- Space-division multiple-access (SDMA)
ASJC Scopus subject areas
- Computer Networks and Communications
- Signal Processing
- Computer Science Applications
Cite this
Orthogonal beamforming using Gram-Schmidt orthogonalization for multi-user MIMO downlink system. / Matsumura, Kunitaka; Ohtsuki, Tomoaki.
In: Eurasip Journal on Wireless Communications and Networking, Vol. 2011, No. 1, 41, 01.12.2011.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Orthogonal beamforming using Gram-Schmidt orthogonalization for multi-user MIMO downlink system
AU - Matsumura, Kunitaka
AU - Ohtsuki, Tomoaki
PY - 2011/12/1
Y1 - 2011/12/1
N2 - 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 paper, we propose a new orthogonal beamforming algorithm to achieve high capacity performance in MIMO broadcast channel. In the proposed method, the base station generates a unitary beamforming vector set using Gram-Schmidt orthogonalization. We extend the algorithm of opportunistic SDMA with limited feedback (LF-OSDMA) to guarantee that the system never loses multiplexing gain for fair comparison with the proposed method by informing unallocated beams. We show that the proposed method can achieve a significantly higher sum capacity than LF-OSDMA and the extended LF-OSDMA without a large increase in the amount of feedback bits and latency.
AB - 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 paper, we propose a new orthogonal beamforming algorithm to achieve high capacity performance in MIMO broadcast channel. In the proposed method, the base station generates a unitary beamforming vector set using Gram-Schmidt orthogonalization. We extend the algorithm of opportunistic SDMA with limited feedback (LF-OSDMA) to guarantee that the system never loses multiplexing gain for fair comparison with the proposed method by informing unallocated beams. We show that the proposed method can achieve a significantly higher sum capacity than LF-OSDMA and the extended LF-OSDMA without a large increase in the amount of feedback bits and latency.
KW - Gram-Schmidt orthogonalization
KW - Multi-user MIMO
KW - Space-division multiple-access (SDMA)
UR - http://www.scopus.com/inward/record.url?scp=84964247873&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84964247873&partnerID=8YFLogxK
U2 - 10.1186/1687-1499-2011-41
DO - 10.1186/1687-1499-2011-41
M3 - Article
AN - SCOPUS:84964247873
VL - 2011
JO - Eurasip Journal on Wireless Communications and Networking
JF - Eurasip Journal on Wireless Communications and Networking
SN - 1687-1472
IS - 1
M1 - 41
ER -