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《Journal of Data Acquisition and Processing》 2011-01
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Improved QR Factorization Detection Algorithm for VBLAST-OFDM System

Fu Hongliang1,Li Yongjie1,2,Zhang Yuan1,Guan Aihong 1(1.Institute of Information Science & Engineering,Henan University of Technology,Zhengzhou,450001,China;2.College of Telecommunications & Information Engineering,Nanjing University of Posts andTelecommunications,Nanjing,210003,China)  
The improved detection algorithms of VBLAST-OFDM based on QR factorization are proposed.To overcome the disadvantage of the poor performance of the first detected layer in QR algorithm,the maximum likelihood(ML) detection and the parallel interference cancellation are applied to the QR factorization algorithm.The signals of the last two layers are detected by using the optimal algorithm in the(2,2) MIMO equivalent system,the signals of the other layers are detected by the back substitution of the detected signals or the detection of the next MIMO equivalent system so that the detected signals are eliminated.The performance of the first detected layer is improved.The algorithms are simulated and compared with the conventional detection algorithms.Simulation results show that the algorithms are superior to the conventional QR algorithm and the zero force(ZF) algorithm.
【Fund】: 国家自然科学基金(60940017)资助项目;; 国家科技支撑计划(2006BAD08B01)资助项目;; 河南省科技创新杰出青年基金(104100510008)资助项目
【CateGory Index】: TN919.3
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