Precoder feedback versus channel feedback in massive MIMO under user cooperation

Chen, Junting; Yin, Haifan; Cottatellucci, Laura; Gesbert, David
ASILOMAR 2015, 49th Asilomar Conference on Signals, Systems, and Computers, November 8-11, 2015, Pacific Grove, CA, USA

In multiuser massive MIMO systems, it is not clear whether users should feed back the channel or the precoder when they can exchange the channel state information (CSI). This
paper compares the precoder feedback scheme with the channel feedback scheme. It is found that when there are sufficient number of bits for CSI exchange, the precoder feedback scheme can reduce the interference leakage to 1/(K −1) of the channel feedback scheme, where K is the number of users. Moreover, the interference leakage under the precoder feedback scheme decreases faster than the channel feedback scheme when the
number of feedback bits increases.

Invited paper in a conference
Pacific Grove
Communication systems
Eurecom Ref:
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