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Common Rate Support in Multi-Antenna Downlink Channels Using Semi-Orthogonal User Selection

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4 Author(s)
Taesang Yoo ; Corp. R&D, Qualcomm Inc., San Diego, CA, USA ; Foschini, G.J. ; Valenzuela, R.A. ; Goldsmith, A.J.

We consider a flat fading multiantenna downlink system with a large number of users where the objective is to deliver equal rates to nonoutage users with a low complexity. We show that in the limit of a large number of users, a zero-forcing beamforming strategy combined with a low complexity user grouping algorithm based on a semi-orthogonal user selection achieves asymptotically optimal performance, with respect to an upper bound that can be achieved when no interference is present among users.

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Information Theory, IEEE Transactions on  (Volume:57 ,  Issue: 6 )