D. Gesbert, M. Kountouris, R.W. Heath Jr., C.-B. Chae, and T. Sälzer, Shifting the MIMO Paradigm, IEEE Signal Processing Magazine, vol. 24, no. 5, pp. 36-46, 2007.
T. Lo, Maximum ratio transmission, IEEE Transactions on Communications, vol. 47, no. 10, pp. 1458–1461, 1999.