Blind Interference Neutralization in 3-Cell Interference Channel with Shared Relay

In this paper, a novel scheme called blind interference neutralization is provided in the 3- cell interference channel with a shared instantaneous relay. The shared relay not only receives signals from sources, but also sends signals to destinations with a processing matrix. With the proposed scheme, each destination is able to pick up its own desired signal without encountering inter-user interference (IUI). In particular, the sources are blind in the sense that no channel state information (CSI) is required for transmit beamforming. Numerical simulation shows that the proposed scheme, compared with others, can increase the sum rate performance.