Random unitary beamforming (RUB) is an attractive transmission scheme for MIMO broadcast channels because of its ability to achieve high sum-rate capacity with limited feedback. In this letter, we derive the exact analytical expressions for the ergodic sum rate of MIMO broadcast channels with RUB. The analysis is facilitated by the development of the complete statistical characterization of ordered beam SINRs for a user, which can find their application in many related problems.
Bibliographical noteFunding Information:
This work was supported in part by a Discovery Grant from NSERC, and in part by the National Research Foundation of Korea Grant funded by the Korea Government (KRF-2010-013-D00041). This paper has been presented in part at the IEEE Wireless Communications Networking Conf. (WCNC’08).
- Multiuser MIMO
- and capacity analysis
- finite feedback
- multiuser diversity
- random beamforming
ASJC Scopus subject areas
- Electrical and Electronic Engineering