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Summary: User Assignment for MIMO-OFDM Systems with
Multiuser Linear Precoding
Hassen Karaa and Raviraj S. Adve
Dept. of Electrical and Computer Engineering, University of Toronto
10 King's College Road, Toronto, Ontario, M5S 3G4, Canada
Email: {hkaraa,rsadve}@comm.utoronto.ca
Abstract-- Recent work has developed single-carrier linear
precoding for the multiuser downlink for multiple-input multiple-
output (MIMO) systems. This paper addresses the problem
of user selection in orthogonal frequency division multiplexing
(OFDM) based MIMO systems using such multiuser precoding.
We propose an effective scheme to assign multiple users, chosen
from a larger set, to individual subcarriers. The scheme is devel-
oped in the context of a previously proposed single-carrier MIMO
linear precoding scheme to minimize the sum mean squared error
(SMSE) over multiple users. We further simplify the implemen-
tation of the proposed algorithm exploiting the inherent channel
correlation between adjacent OFDM subcarriers. Simulations
show that the proposed user assignment algorithm exhibits near
optimal performance and that reducing the computational load
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