文件名称:Downlink-MIMO-in-LTE-Advanced-SU-MIMO-vs-MU-MIMO.
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CSI feedback allows downlink transmission
to be adaptively optimized based on the
instantaneous DL channel, so that closedloop
beamforming and adaptive link adaptation
can be enabled to optimize the system
performance. The DL reference signal used
for CSI measurement is different in Rel-8
and Rel-10. In Rel-8, CSI measurement is
based on CRS, which is also used for data
demodulation. In contrast, CSI measurement
in Rel-10 is based on a set of newly introduced
CSI-RS signals, which is low-dutycycle
and low-density, and allows a higher
reuse factor than Rel-8 CRS.
to be adaptively optimized based on the
instantaneous DL channel, so that closedloop
beamforming and adaptive link adaptation
can be enabled to optimize the system
performance. The DL reference signal used
for CSI measurement is different in Rel-8
and Rel-10. In Rel-8, CSI measurement is
based on CRS, which is also used for data
demodulation. In contrast, CSI measurement
in Rel-10 is based on a set of newly introduced
CSI-RS signals, which is low-dutycycle
and low-density, and allows a higher
reuse factor than Rel-8 CRS.
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Downlink MIMO in LTE-Advanced SU-MIMO vs MU-MIMO.pdf