Abstract
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.
Original language | English (US) |
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Article number | 5773070 |
Pages (from-to) | 3449-3461 |
Number of pages | 13 |
Journal | IEEE Transactions on Information Theory |
Volume | 57 |
Issue number | 6 |
DOIs | |
State | Published - Jun 2011 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Information Systems
- Computer Science Applications
- Library and Information Sciences
Keywords
- MIMO downlink
- multi-user diversity
- semi-orthogonal user selection
- zero-forcing beamforming