Interference alignment for K-user MIMO interference channel using multiple relays

In this paper, we mainly focused on achieve the desired degree of freedom. Channel state information at the transmitter (CSIT) plays major role for K-user Multiple Input and Multiple Output (MIMO) M × N interference channels. Span Interference alignment method is used in order to align the interference. Each transmitter has two antennas which help to communicate with transmitter and relay node in an efficient way. In addition, by adding the relay nodes with the desired system model is helps to recover the Degree of Freedom (DoF) which is ideal for these models with global channel state information (CSI). Recently studies have shown that relay cannot improve the DoF of wireless interference networks but it helps to give some partial solutions to approach the interference alignment. The relay nodes which helps to steer directions of transmitter signals to expedite the interference alignment in order to achieve optimal DoF. A new performance method has been proposed in order to estimate the efficiency of an interference alignment.