... Lozano, and R. Valenzuela, “Network MIMO: overcoming intercell interference in indoor wireless systems, ” in Proceedings of the 41th Asilomar Conference onSignals, Systems and Computers, pp. 83–87, ... approximation in (20), weconsider a hexagonal cellular layout with cell sectoring. By using 120-degree sectoring in each cell, every 3 neighboringcells can coordinate with each other to serve users in ... MIMO, ” TheIEEE Transactions on Signal Processing,submitted.[9] T. Tamaki, K. Seong, and J. M. Cioffi, “Downlink MIMO systems using cooperation among base stations in a slowfading channel,” in...