... capacity of the MIMO BC (denoted as CBC (H ; ; H K ; P )) was shown to be achievable by dirtypaper coding [4] From these results, the sum rate capacity can be written in terms of the following ... [10], a duality is shown to exist between the uplink and downlink which establishes that the dirty paper rate region for the MIMO BC is equal to the capacity region of the dual MIMO MAC (described ... (48) 01=2 (51) + (n) Gi y (n) QiGi (50) : [11] S Vishwanath, W Rhee, N Jindal, S A Jafar, and A Goldsmith, “Sum power iterative water-filling for Gaussian vector broadcast channels,” in Proc IEEE...