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M. Rezaeekheirabadi, M. Guillaud:
"Limited Feedback for Interference Alignment in the K-user MIMO Interference Channel";
Talk: IEEE Information Theory Workshop, Lausanne, Schweiz; 09-03-2012 - 09-07-2012; in: "Proc. Information Theory Workshop", (2012), 1 - 5.

A simple limited feedback scheme is proposed for
interference alignment on the K-user Multiple-Input-Multiple-
Output Interference Channel (MIMO-IC). The scaling of the
number of feedback bits with the transmit power required
to preserve the multiplexing gain that can be achieved using
perfect channel state information (CSI) is derived. This result is
obtained through a reformulation of the interference alignment
problem in order to exploit the benefits of quantization on the
Grassmann manifold, which is well investigated in the single-user
MIMO channel. Furthermore, through simulations we show that
the proposed scheme outperforms the naive feedback scheme
consisting in independently quantizing the channel matrices, in
the sense that it yields a better sum rate performance for the
same number of feedback bits.

interference alignment, Grassmannian quantization, channel state information

http://publik.tuwien.ac.at/files/PubDat_211881.pdf