QoS based precoding scheme in K-user MIMO interference channels

A QoS based precoding scheme with partial CSIT and simple computation in K-user MIMO interference channel is proposed. A transmitter-receiver pair for interference alignment (IA) is selected by a given criterion such as QoS or required data rate, etc., and others are performed by random beamforming and whitening matched filtering. Global channel knowledge is no longer needed at all transmitters and computational complexity is significantly reduced for transmitter and receiver design. Numerical results show that the sum capacity of the proposed scheme is reasonable compared to that of perfect IA.