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: Research Article Sum Rate Optimization by Spatial Precoding for a Multiuser MIMO DFT-Precoded OFDM Uplink | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2011 Article ID 927936 12 pages doi 2011 927936 Research Article Sum Rate Optimization by Spatial Precoding for a Multiuser MIMO DFT-PreCoded OFDM Uplink Hanguang Wu 1 Thomas Haustein EURASIP Member 2 Eduard Axel Jorswieck EURASIP Member 3 and Peter Adam Hoeher4 1mimoOn GmbH Bismarckstrafie 120 47057Duisburg Germany 2Fraunhofer-Institute for Telecommunications Heinrich-Hertz-Institute Einsteinufer 37 10587 Berlin Germany 3 Communications Laboratory Dresden University of Technology 01062 Dresden Germany 4Faculty of Engineering University of Kiel Kaiserstrafie 2 24143 Kiel Germany Correspondence should be addressed to Hanguang Wu wuhanguang@ Received 15 October 2010 Revised 31 January 2011 Accepted 10 February 2011 Academic Editor Robert Fischer Copyright 2011 Hanguang Wu et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. By means of DFT-precoding the PAPR of OFDM waveforms can be reduced. DFT-precoding has been proposed for uplink transmission in various future wireless communication systems. In this work we consider DFT-precoding combined with spatial precoding for the uplink of multiuser MIMO OFDM systems. An efficient algorithm is developed to optimize the spatial precoder aiming at maximization of the system sum rate subject to individual power constraints of the users and maintenance of the low PAPR property for one user. Potential gains are shown compared to other popular precoding methods in 3GPP-LTE uplink scenarios. 1. Introduction Over the last years the demand for high data rates has increased significantly. This has led to the use of wider transmission bandwidth and MIMO Multiple-Input MultipleOutput techniques. In a cellular environment and especially at large transmission bandwidth the
