Multi user diversity and channel state information
2016-08-23
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Application background
In a multiple transmit antenna, single antenna per receiver downlink channel with limited channelstate feedback, we consider the following question: given a constraint on the total system-wide
feedback load, is it preferable to get low-rate/coarse channel feedback from a large number of
receivers or high-rate/high-quality feedback from a smaller number of receivers? Acquiring feedback
from many receivers allows multi-user diversity to be exploited, while high-rate feedback allows
for very precise selection of beamforming directions. We show that there is a strong preference for
obtaining high-quality feedback, and that obtaining near-perfect channel information from as many
receivers as possible provides a significantly larger sum rate than collecting a few feedback bits from
a large number of users.
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mimo
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