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of MIMO precoding for system performance enhancements. Insights into the optimization of
trade-os across system performance, preservation of information quality including at the edges
of wireless coverage, in terms of feedback information signaling overhead, MIMO precoding
eectiveness, are revealed through exibility in the estimation of radio-channel conditions. e
latter conditions are inuenced by interference, noise, and the correlation between the antenna
and the radio channel, where the level of correlation determines the proper recovery of the code
words bearing information streams.
In the uplink direction, cooperating base stations serve as a spatially distributed array of
receive antennas, resulting in a spatia