Downlink transmit beamforming in TDD-MIMO systems
Concerning the access terminals （AT） use single antenna to transmit, two precoding methods were proposed for TDD systems that combined instantaneous CSI and statistical CSI effectively. When without feedback, instant perfect CSI was utilized to the most, while using the degrees of freedom to guarant...
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| Format: | Article |
| Language: | zho |
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Editorial Department of Journal on Communications
2009-01-01
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| Series: | Tongxin xuebao |
| Subjects: | |
| Online Access: | http://www.joconline.com.cn/zh/article/74652954/ |
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| _version_ | 1841537610797809664 |
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| author | XU Dao-feng 1 YANG Lv-xi1 |
| author_facet | XU Dao-feng 1 YANG Lv-xi1 |
| author_sort | XU Dao-feng 1 |
| collection | DOAJ |
| description | Concerning the access terminals （AT） use single antenna to transmit, two precoding methods were proposed for TDD systems that combined instantaneous CSI and statistical CSI effectively. When without feedback, instant perfect CSI was utilized to the most, while using the degrees of freedom to guarantee the average throughput of other streams; when with limited feedback, the direction of the channel vector corresponding to the second antenna at AT was firstly estimated using constrained maximum likelihood estimation, and then the optimal precoding matrix was determined through singular value decomposition of the estimated channel matrix. Simulations demonstrate the effectiveness of the proposed methods. |
| format | Article |
| id | doaj-art-522f487d4c664ebaa7943b8217d327ea |
| institution | Kabale University |
| issn | 1000-436X |
| language | zho |
| publishDate | 2009-01-01 |
| publisher | Editorial Department of Journal on Communications |
| record_format | Article |
| series | Tongxin xuebao |
| spelling | doaj-art-522f487d4c664ebaa7943b8217d327ea2025-01-14T08:29:31ZzhoEditorial Department of Journal on CommunicationsTongxin xuebao1000-436X2009-01-0130354174652954Downlink transmit beamforming in TDD-MIMO systemsXU Dao-feng 1YANG Lv-xi1Concerning the access terminals （AT） use single antenna to transmit, two precoding methods were proposed for TDD systems that combined instantaneous CSI and statistical CSI effectively. When without feedback, instant perfect CSI was utilized to the most, while using the degrees of freedom to guarantee the average throughput of other streams; when with limited feedback, the direction of the channel vector corresponding to the second antenna at AT was firstly estimated using constrained maximum likelihood estimation, and then the optimal precoding matrix was determined through singular value decomposition of the estimated channel matrix. Simulations demonstrate the effectiveness of the proposed methods.http://www.joconline.com.cn/zh/article/74652954/multiuser MIMOTDDprecodinglimited feedbackconstrained maximum likelihood |
| spellingShingle | XU Dao-feng 1 YANG Lv-xi1 Downlink transmit beamforming in TDD-MIMO systems Tongxin xuebao multiuser MIMO TDD precoding limited feedback constrained maximum likelihood |
| title | Downlink transmit beamforming in TDD-MIMO systems |
| title_full | Downlink transmit beamforming in TDD-MIMO systems |
| title_fullStr | Downlink transmit beamforming in TDD-MIMO systems |
| title_full_unstemmed | Downlink transmit beamforming in TDD-MIMO systems |
| title_short | Downlink transmit beamforming in TDD-MIMO systems |
| title_sort | downlink transmit beamforming in tdd mimo systems |
| topic | multiuser MIMO TDD precoding limited feedback constrained maximum likelihood |
| url | http://www.joconline.com.cn/zh/article/74652954/ |
| work_keys_str_mv | AT xudaofeng1 downlinktransmitbeamformingintddmimosystems AT yanglvxi1 downlinktransmitbeamformingintddmimosystems |