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Exact Sum-Rate Analysis of MIMO Broadcast Channels with Random Unitary Beamforming

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4 Author(s)
Hong-Chuan Yang ; Dept. of Electr. & Comput. Eng., Univ. of Victoria, Victoria, BC, Canada ; Peng Lu ; Hyung-Ki Sung ; Young-chai Ko

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.

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Communications, IEEE Transactions on  (Volume:59 ,  Issue: 11 )