Abstract:
In this paper, we consider a narrowband point-to-point MIMO
communication system with multiple transmit and
receive antennas, and we assume that the receiver has perfect
knowledge of the channel. We consider two canonical cases of
partial channel feedback: (a) where the mean channel is fed back
to the transmitter and the channel covariance is assumed to be
white with known magnitude, and (b) the covariance (assumed
factorizable) of the channel is fed back to transmitter, and we
assume the mean channel is zero. In both cases we are able to
derive an exact analytic condition (both necessary and sufficient)
that determines when beamforming is optimal for maximizing the
average throughput.
Status:
Presented at the 2002 DIMACS Conference on Signal Processing for
Wireless Transmission
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