Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: PhantomNet: Exploring Optimal Multicellular Multiple Antenna Systems | EURASIP Journal on Applied Signal Processing 2004 5 591-604 2004 Hindawi Publishing Corporation PhantomNet Exploring Optimal Multicellular Multiple Antenna Systems Syed A. Jafar Electrical Engineering and Computer Science University of California Irvine Irvine CA 92697-2625 USA Email syed@ Gerard J. Foschini Bell Laboratories Lucent Technologies 791 Holmdel-Keyport Road Holmdel NJ 07733 USA Email gjf@ Andrea J. Goldsmith Wireless Systems Laboratory Stanford University Stanford CA 94305-9505 USA Email andrea@ Received 20 December 2002 Revised 11 August 2003 We present a network framework for evaluating the theoretical performance limits of wireless data communication. We address the problem of providing the best possible service to new users joining the system without affecting existing users. Since interferencewise new users are required to be invisible to existing users the network is dubbed PhantomNet. The novelty is the generality obtained in this context. Namely we can deal with multiple users multiple antennas and multiple cells on both the uplink and the downlink. The solution for the uplink is effectively the same as for a single cell system since all the base stations BSs simply amount to one composite BS with centralized processing. The optimum strategy following directly from known results is successive decoding SD where the new user is decoded before the existing users so that the new users signal can be subtracted out to meet its invisibility requirement. Only the BS needs to modify its decoding scheme in the handling of new users since existing users continue to transmit their data exactly as they did before the new arrivals. The downlink even with the BSs operating as one composite BS is more problematic. With multiple antennas at each BS site the optimal coding scheme and the capacity region for this channel are unsolved problems. SD and dirty paper DP are two schemes previously reported to achieve capacity in special
