Jointly Optimized Two-Cell MIMO System


C. B. Chae, I. Hwang, Robert W. Heath, Jr., and Vahid Tarokh


Proc. of IEEE GLOBECOM Workshops (GC Wkshps), 2011, vol., no., pp. 421 - 425, Houston, TX, December 5-9, 2011.


Jointly optimized interference aware coordinated beamforming (IA-CBF) algorithms for a two-cell system are investigated, where each base/mobile station is equipped with multiple transmit antennas. We first derive a minimum-mean square- error IA-CBF algorithm based on a lower bound on the achievable sum rate. We next propose optimal (under an assumption of zero other-cell interference) and suboptimal transmit/ receive beamforming vectors through zero-forcing IA-CBF algorithms. Numerical results confirm that the proposed system shows better sum rate performance than competitive solutions such as non-cooperative eigen-beamforming and interference nulling.