K =2 Users K =4 Users K =6 Users Computation Complexity d =0.5km d =0.9km d =0.5km d =0.9km d =0.5km d =0.9km UB 44.2642 33.1294 55.7414 42.8390 60.6901 49.6214 O ( KN $^{2}$) Optimal 37.1168 29.8642 47.9975 35.6520 52.1299 41.0121 O ( K $^{NL}$) + DoD ( LKN ) Centralized A 36.8061 28.6973 46.4765 34.0713 51.2868 40.5845 O ( KN 2 + NKLM ) + DoD ( LKN ) Centralized B 36.4755 27.0352 45.6239 33.4280 49.7971 38.7237 O ( KN $^{2}$) + DoD ( L ) Distributed 35.3623 25.9976 43.5918 31.9231 48.8887 38.0050 O ( KN $^{2}$) + DoD ( L ) LB 35.0966 25.8635 42.5509 31.0261 48.1571 37.7996 O ( KN $^{2}$) TABLE I AVERAGE NETWORK THROUGHPUT (IN BPS/HZ/CELL) OF THE DERIVED BOUNDS, CENTRALIZED AND DISTRIBUTED SCHEMES FOR L =2 CELLS AND N = 6 SUBCARRIERS/CELL 20 DRAFT March 19, 2018