Summary: Linear Precoding for Multiuser MIMO Systems
with Multiple Base Stations
Imad H. Azzam
Research in Motion,
305 Phillip Street, Waterloo, ON, Canada N2L 3W8
Raviraj S. Adve
Dept. of Elec. and Comp. Eng., University of Toronto,
10 King's College Road, Toronto, ON, Canada M5S 3G4.
Abstract--Linear precoding for multiuser multiple input mul-
tiple output (MIMO) cellular systems has generally focused on a
single isolated cell. A crucial tool in algorithm development has
been a downlink/uplink duality. Here we investigate downlink
multiuser communications across multiple cells. Previous work
identified the resulting asynchronous interference as a key issue.
We prove the existence of a downlink/uplink duality requiring
time reversal. This duality is used to develop an effective linear
precoding algorithm for multiuser, multi-cell, MIMO systems.
Simulation results illustrate the importance of accounting for,