Interference-Free Relay Transmission with no CSI-S for the MIMO Two-Hop Interference Channel


Namyoon Lee and Robert W. Heath, Jr.


IEEE International Conference on Systems, Signals and image processing (IWSSIP) 2012, April 2012.


In this paper, we consider the multiple-input-multiple-output (MIMO) two-hop interference channels where two source-destination pairs having M antennas wish to communicate via two intermediate relays, each equipped with M antennas. For such a channel, we prove that 2M-1 degrees of freedom (DoF) are achievable without any knowledge of the channel state information at the sources (CSI-S). The key to showing this result is a new interference-free relay transmission method, which is inspired by interference neutralization.

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