'Institute of Electrical and Electronics Engineers (IEEE)'
Doi
Abstract
Presence of multiple antennas on both sides of
a communication channel promises significant improvements in
system throughput and power efficiency. In effect, a new clas
s
of large multiple-input multiple-output (MIMO) communication
systems has recently emerged and attracted both scientific and
industrial attention. To analyze these systems in realistic scenarios,
one has to include such aspects as co-channel interference,
multiple access and spatial correlation. In this paper, we study
the properties of correlated MIMO multiple-access channels in
the presence of external interference. Using the replica method
from statistical physics, we derive the ergodic sum-rate of the
communication for arbitrary signal constellations when the numbers
of antennas at both ends of the channel grow large. Based
on these asymptotic expressions, we also address the problem of
sum-rate maximization using statistical channel information and
linear precoding. The numerical results demonstrate that when
the interfering terminals use discrete constellations, the resulting
interference becomes easier to handle compared to Gaussian
signals. Thus, it may be possible to accommodate more interfering
transmitter-receiver pairs within the same area as compare
d
to the case of Gaussian signals. In addition, we demonstrate
numerically for the Gaussian and QPSK signaling schemes that it
is possible to design precoder matrices that significantly improve
the achievable rates at low-to-mid range of signal-to-noise ratios
when compared to isotropic precoding
