open access

https://hdl.handle.net/2115/46850

A generalized approach to block diagonalization for multiuser MIMO downlink

英語

2010-09-26

IEEE

2010 IEEE 21st International Symposium on Personal Indoor and Mobile Radio Communications (PIMRC)

504-509

In multiple input multiple output (MIMO) systems, multiuser enhancement is in the implementation phase. Block diagonalization (BD) is known as the safest technique for the multiuser MIMO downlink since it suppresses the inter-user interference (IUI) perfectly. However, BD consumes most of the transmit antenna resource to form many nulls. Thus, it is very difficult to obtain the transmit diversity gain. In the paper, the adaptive selection of the number of layers is considered. Such approaches have been limited to iterative beamforming. Here, we formulate deterministic transmit beamforming as a generalized approach to the BD (GBD), based on a concept of projecting the IUI to a limited vector space. Our proposal can efficiently utilize the extra degrees of freedom, which are obtained in exchange for reducing the number of layers, to provide the diversity gain in the transmit beamforming. The high capability of the GBD is confirmed by computer simulations.

会議発表論文

Accepted Manuscript

© 2010 IEEE. Reprinted, with permission, from Tomoki Sada, Julian Webber, Toshihiko Nishimura, Takeo Ohgane, and Yasutaka Ogawa, A Generalized Approach to Block Diagonalization for Multiuser MIMO Downlink, 2010 IEEE 21 st Intemational Symposium on Personal Indoor and Mobile Radio Communications, Sep. 2010. This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of Hokkaido University products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to pubs-permissions@ieee.org. By choosing to view this document, you agree to all provisions of the copyright laws protecting it.