Kemal Karakayali, Roy D. Yates, Gerard J. Foschini, Reinaldo A. Valenzuela. Optimum Zero-forcing Beamforming with Per-antenna Power Constraints. In IEEE International Symposium on Information Theory, ISIT 2007, Nice, France, June 24-29, 2007. pages 101-105, IEEE, 2007. [doi]
Abstract is missing.