Interference alignment design for two-cell MIMO uplink systems with limited feedback

Many studies have combined interference alignment (IA) with limited feedback in cellular systems. The limited feedback will produce residual inter-cell interference (ICI), which causes system throughput loss. Some IA scheme has been proposed to mitigate the residual ICI. However, the residual ICI with the existing scheme is still significant. In this paper, we propose an IA scheme for two-cell multiple-input multiple-output (MIMO) uplink systems with limited feedback to mitigate the residual ICI more effectively. In the proposed scheme we design the receiver according to the estimated ICI. The proposed scheme minimizes the residual ICI, thus improving the performance of system throughput. Simulations also verify its effectiveness.