摘要
基于VBLAST-OFDM系统中传统QR分解算法,将最大似然和并行干扰消除的思想引入QR分解算法中,提出了对QR分解算法的改进方法,克服了传统QR分解算法检测性能差的缺点,运用QR分解从最后两层信号开始,等效为2收2发的MIMO系统。用最优算法检测判决后,回代到原QR分解算法检测余下层信号;或者依次并行消除已判决信号的影响,再进行下个等效MIMO系统的判决,直至所有信号检测完毕。仿真结果表明,本文改进的QR分解检测算法比传统的QR算法和迫零算法在误码性能上得到改善。
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.
出处
《数据采集与处理》
CSCD
北大核心
2011年第1期47-51,共5页
Journal of Data Acquisition and Processing
基金
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
