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Performance Evaluation of Multiuser MIMO E-SDM Systems in Time-Varying Fading Environments
Title: | Performance Evaluation of Multiuser MIMO E-SDM Systems in Time-Varying Fading Environments |
Authors: | Bui, Huu Phu Browse this author | Ogawa, Yasutaka Browse this author →KAKEN DB | Nishimura, Toshihiko Browse this author →KAKEN DB | Ohgane, Takeo Browse this author →KAKEN DB |
Keywords: | multiuser MIMO systems | eigenbeam-space division multiplexing E-SDM | channel extrapolation | time-varying fading environments |
Issue Date: | 1-Jul-2009 |
Publisher: | IEICE - The Institute of Electronics, Information and Communication Engineers |
Journal Title: | IEICE Transactions on Communications |
Volume: | E92-B |
Issue: | 7 |
Start Page: | 2374 |
End Page: | 2388 |
Publisher DOI: | 10.1587/transcom.E92.B.2374 |
Abstract: | In this paper, the performance of multiuser MIMO E-SDM systems in downlink transmission is evaluated in both uncorrelated and correlated time-varying fading environments. In the ideal case, using the block diagonalization scheme, inter-user interference can be completely eliminated at each user; and using the E-SDM technique for each user, optimal resource allocation can be achieved, and spatially orthogonal substreams can be obtained. Therefore, a combination of the block diagonalization scheme and the E-SDM technique applied to multiuser MIMO systems gives very good results. In realistic environments, however, due to the dynamic nature of the channel and processing delay at both the transmitter and the receiver, the channel change during the delay may cause inter-user interference even if the BD scheme is used. In addition, the change may also result in large inter-substream interference and prevent optimal resource allocation from being achieved. As a result, system performance may be degraded seriously. To overcome the problem, we propose a method of channel extrapolation to compensate for the channel change. Applying our proposed method, simulation results show that much better system performance can be obtained than the conventional case. Moreover, it also shows that the system performance in the correlated fading environments is much dependent on the antenna configuration and the angle spread from the base station to scatterers. |
Rights: | Copyright © 2009 The Institute of Electronics, Information and Communication Engineers |
Relation: | http://search.ieice.org/ |
Type: | article |
URI: | http://hdl.handle.net/2115/42155 |
Appears in Collections: | 情報科学院・情報科学研究院 (Graduate School of Information Science and Technology / Faculty of Information Science and Technology) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 大鐘 武雄
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