tailieunhanh - Báo cáo hóa học: " Research Article MMSE Beamforming for SC-FDMA Transmission over MIMO ISI Channels"

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 MMSE Beamforming for SC-FDMA Transmission over MIMO ISI Channels | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2011 Article ID614571 11 pages doi 2011 614571 Research Article MMSE Beamforming for SC-FDMA Transmission over MIMOISI Channels Uyen Ly Dang 1 Michael A. Ruder 1 Robert Schober 2 and Wolfgang H. Gerstacker1 1 Institute of Mobile Communications University of Erlangen-Nurnberg Cauerstrafe 7 91058 Erlangen Germany 2 Department of Electrical and Computer Engineering University of British Columbia Vancouver BC Canada V6T1Z4 Correspondence should be addressed to Wolfgang H. Gerstacker gersta@ Received 12 May 2010 Revised 14 October 2010 Accepted 9 November 2010 Academic Editor D. D. Falconer Copyright 2011 Uyen Ly Dang 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. We consider transmit beamforming for single-carrier frequency-division multiple access SC-FDMA transmission over frequency-selective multiple-input multiple-output MIMO channels. The beamforming filters are optimized for minimization of the sum of the mean-squared errors MSEs of the transmitted data streams after MIMO minimum mean-squared error linear equalization MMSE-LE and for minimization of the product of the MSEs after MIMO MMSE decision-feedback equalization MMSE-DFE respectively. We prove that for SC-FDMA transmission in both cases eigenbeamforming diagonalizing the overall channel together with a nonuniform power distribution is the optimum beamforming strategy. The optimum power allocation derived for MMSE-LE is similar in spirit to classical results for the optimum continuous-time transmit filter for linear modulation formats obtained by Berger Tufts and Yang Roy whereas for MMSE-DFE the capacity achieving waterfilling strategy well known from conventional single-carrier transmission schemes is obtained. Moreover we present a .