naa a22 4500 510798241 CHVBK 20180411083344.0 cr unu---uuuuu 180411e20131001xx s 000 0 eng 10.1007/s11277-013-1117-9 doi (NATIONALLICENCE)springer-10.1007/s11277-013-1117-9 Robust Non-linear Precoder for Multiuser MISO Systems Based on Delay and Channel Quantization [Elektronische Daten] [Yanzhi Sun, Muqing Wu, Qilin Guo, Feng Zheng, Chunxiu Xu] In multiuser multiple-input single-output (MISO) systems, non-linear precoder is able to achieve the theoretical sum capacity of downlink channel with perfect channel state information (CSI). However, the perfect CSI is not available at the transmitter in practical system, especially in frequency division duplex (FDD) system where the imperfect CSI is the delayed, quantized channel direction information relayed back from the receiver through a dedicated feedback channel. So the performance of conventional non-linear precoder degrades significantly. In this paper, a robust non-linear Tomlinson-Harashima precoding (THP) based on sum mean squared error (SMSE) minimization for the downlink of multiuser MISO FDD systems is proposed. The proposed precoder is robust to the channel uncertainties arising from channel delay and quantization error. Furthermore, an improved non-linear THP with channel magnitude information (CMI) consideration is introduced to compensate the instantaneous CMI shortage at the transmitter. Additionally, the computational complexity of both proposed precoders can be reduced remarkably by Cholesky factorization with symmetric permutation. Simulation results demonstrate the improvement in bit error ratio performance and illustrate the SMSE performance of the proposed algorithms compared with conventional THP with perfect CSI in the literature. Springer Science+Business Media New York, 2013 Multi-user multiple-input single-output (MISO) nationallicence Robust non-linear precoder nationallicence Tomlinson-Harashima precoding (THP) nationallicence Delay nationallicence Channel quantization nationallicence Sun Yanzhi Laboratory of Network System Architecture and Convergence, Beijing University of Posts and Telecommunications, Beijing, China aut Wu Muqing Laboratory of Network System Architecture and Convergence, Beijing University of Posts and Telecommunications, Beijing, China aut Guo Qilin Laboratory of Network System Architecture and Convergence, Beijing University of Posts and Telecommunications, Beijing, China aut Zheng Feng Laboratory of Network System Architecture and Convergence, Beijing University of Posts and Telecommunications, Beijing, China aut Xu Chunxiu Laboratory of Network System Architecture and Convergence, Beijing University of Posts and Telecommunications, Beijing, China aut Wireless Personal Communications Springer US; http://www.springer-ny.com 72/4(2013-10-01), 1993-2014 0929-6212 72:4<1993 2013 72 11277 https://doi.org/10.1007/s11277-013-1117-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11277-013-1117-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sun Yanzhi Laboratory of Network System Architecture and Convergence, Beijing University of Posts and Telecommunications, Beijing, China aut NATIONALLICENCE 700 1- Wu Muqing Laboratory of Network System Architecture and Convergence, Beijing University of Posts and Telecommunications, Beijing, China aut NATIONALLICENCE 700 1- Guo Qilin Laboratory of Network System Architecture and Convergence, Beijing University of Posts and Telecommunications, Beijing, China aut NATIONALLICENCE 700 1- Zheng Feng Laboratory of Network System Architecture and Convergence, Beijing University of Posts and Telecommunications, Beijing, China aut NATIONALLICENCE 700 1- Xu Chunxiu Laboratory of Network System Architecture and Convergence, Beijing University of Posts and Telecommunications, Beijing, China aut NATIONALLICENCE 773 0- Wireless Personal Communications Springer US; http://www.springer-ny.com 72/4(2013-10-01), 1993-2014 0929-6212 72:4<1993 2013 72 11277 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer