Study on Opportunistic Beamforming with Multiple Receive Antennas
| Autor: | Chun-How Chang, 張鈞皓 |
|---|---|
| Rok vydání: | 2008 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 96 Opportunistic beamforming can increase the fluctuation of channel dynamic range and rate, and so enhance the multiuser diversity gain and fairness in the content of multiuser scheduling. In this thesis, we further improve the system performance by employing multiple antennas at the receivers. Additional spatial diversity gain can then be provided. System throughput, waiting time and fairness are all enhanced, and the amount of feedback information is kept the same as that of the conventional opportunistic beamforming. We show that even with smaller number of users, slower changing rate of the beamforming weights, or less fluctuated channels, the same system capacity can be kept by the proposed scheme. All these help to obtain the multiuser diversity gain more effectively. On the other hand, with the channel prediction mechanism, we demonstrate that pre-scheduling can be used to further improve the system capacity of the proposed scheme. The waiting time and fairness performance can be enhanced as well provided that accurate channel-prediction information is available. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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